1310 lines
38 KiB
JavaScript
1310 lines
38 KiB
JavaScript
/*! Scroller 2.0.5
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* ©2011-2021 SpryMedia Ltd - datatables.net/license
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*/
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/**
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* @summary Scroller
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* @description Virtual rendering for DataTables
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* @version 2.0.5
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* @file dataTables.scroller.js
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* @author SpryMedia Ltd (www.sprymedia.co.uk)
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* @contact www.sprymedia.co.uk/contact
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* @copyright Copyright 2011-2021 SpryMedia Ltd.
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*
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* This source file is free software, available under the following license:
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* MIT license - http://datatables.net/license/mit
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*
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* This source file is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the license files for details.
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*
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* For details please refer to: http://www.datatables.net
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*/
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(function( factory ){
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if ( typeof define === 'function' && define.amd ) {
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// AMD
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define( ['jquery', 'datatables.net'], function ( $ ) {
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return factory( $, window, document );
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} );
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}
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else if ( typeof exports === 'object' ) {
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// CommonJS
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module.exports = function (root, $) {
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if ( ! root ) {
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root = window;
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}
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if ( ! $ || ! $.fn.dataTable ) {
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$ = require('datatables.net')(root, $).$;
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}
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return factory( $, root, root.document );
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};
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}
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else {
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// Browser
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factory( jQuery, window, document );
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}
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}(function( $, window, document, undefined ) {
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'use strict';
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var DataTable = $.fn.dataTable;
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/**
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* Scroller is a virtual rendering plug-in for DataTables which allows large
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* datasets to be drawn on screen every quickly. What the virtual rendering means
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* is that only the visible portion of the table (and a bit to either side to make
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* the scrolling smooth) is drawn, while the scrolling container gives the
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* visual impression that the whole table is visible. This is done by making use
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* of the pagination abilities of DataTables and moving the table around in the
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* scrolling container DataTables adds to the page. The scrolling container is
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* forced to the height it would be for the full table display using an extra
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* element.
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*
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* Note that rows in the table MUST all be the same height. Information in a cell
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* which expands on to multiple lines will cause some odd behaviour in the scrolling.
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*
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* Scroller is initialised by simply including the letter 'S' in the sDom for the
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* table you want to have this feature enabled on. Note that the 'S' must come
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* AFTER the 't' parameter in `dom`.
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*
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* Key features include:
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* <ul class="limit_length">
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* <li>Speed! The aim of Scroller for DataTables is to make rendering large data sets fast</li>
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* <li>Full compatibility with deferred rendering in DataTables for maximum speed</li>
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* <li>Display millions of rows</li>
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* <li>Integration with state saving in DataTables (scrolling position is saved)</li>
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* <li>Easy to use</li>
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* </ul>
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*
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* @class
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* @constructor
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* @global
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* @param {object} dt DataTables settings object or API instance
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* @param {object} [opts={}] Configuration object for Scroller. Options
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* are defined by {@link Scroller.defaults}
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*
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* @requires jQuery 1.7+
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* @requires DataTables 1.10.0+
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*
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* @example
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* $(document).ready(function() {
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* $('#example').DataTable( {
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* "scrollY": "200px",
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* "ajax": "media/dataset/large.txt",
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* "scroller": true,
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* "deferRender": true
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* } );
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* } );
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*/
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var Scroller = function ( dt, opts ) {
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/* Sanity check - you just know it will happen */
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if ( ! (this instanceof Scroller) ) {
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alert( "Scroller warning: Scroller must be initialised with the 'new' keyword." );
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return;
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}
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if ( opts === undefined ) {
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opts = {};
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}
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var dtApi = $.fn.dataTable.Api( dt );
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/**
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* Settings object which contains customisable information for the Scroller instance
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* @namespace
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* @private
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* @extends Scroller.defaults
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*/
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this.s = {
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/**
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* DataTables settings object
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* @type object
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* @default Passed in as first parameter to constructor
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*/
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dt: dtApi.settings()[0],
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/**
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* DataTables API instance
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* @type DataTable.Api
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*/
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dtApi: dtApi,
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/**
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* Pixel location of the top of the drawn table in the viewport
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* @type int
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* @default 0
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*/
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tableTop: 0,
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/**
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* Pixel location of the bottom of the drawn table in the viewport
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* @type int
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* @default 0
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*/
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tableBottom: 0,
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/**
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* Pixel location of the boundary for when the next data set should be loaded and drawn
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* when scrolling up the way.
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* @type int
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* @default 0
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* @private
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*/
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redrawTop: 0,
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/**
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* Pixel location of the boundary for when the next data set should be loaded and drawn
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* when scrolling down the way. Note that this is actually calculated as the offset from
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* the top.
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* @type int
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* @default 0
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* @private
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*/
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redrawBottom: 0,
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/**
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* Auto row height or not indicator
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* @type bool
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* @default 0
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*/
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autoHeight: true,
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/**
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* Number of rows calculated as visible in the visible viewport
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* @type int
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* @default 0
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*/
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viewportRows: 0,
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/**
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* setTimeout reference for state saving, used when state saving is enabled in the DataTable
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* and when the user scrolls the viewport in order to stop the cookie set taking too much
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* CPU!
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* @type int
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* @default 0
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*/
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stateTO: null,
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stateSaveThrottle: function () {},
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/**
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* setTimeout reference for the redraw, used when server-side processing is enabled in the
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* DataTables in order to prevent DoSing the server
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* @type int
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* @default null
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*/
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drawTO: null,
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heights: {
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jump: null,
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page: null,
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virtual: null,
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scroll: null,
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/**
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* Height of rows in the table
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* @type int
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* @default 0
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*/
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row: null,
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/**
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* Pixel height of the viewport
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* @type int
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* @default 0
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*/
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viewport: null,
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labelHeight: 0,
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xbar: 0
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},
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topRowFloat: 0,
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scrollDrawDiff: null,
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loaderVisible: false,
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forceReposition: false,
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baseRowTop: 0,
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baseScrollTop: 0,
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mousedown: false,
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lastScrollTop: 0
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};
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// @todo The defaults should extend a `c` property and the internal settings
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// only held in the `s` property. At the moment they are mixed
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this.s = $.extend( this.s, Scroller.oDefaults, opts );
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// Workaround for row height being read from height object (see above comment)
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this.s.heights.row = this.s.rowHeight;
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/**
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* DOM elements used by the class instance
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* @private
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* @namespace
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*
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*/
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this.dom = {
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"force": document.createElement('div'),
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"label": $('<div class="dts_label">0</div>'),
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"scroller": null,
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"table": null,
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"loader": null
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};
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// Attach the instance to the DataTables instance so it can be accessed in
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// future. Don't initialise Scroller twice on the same table
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if ( this.s.dt.oScroller ) {
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return;
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}
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this.s.dt.oScroller = this;
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/* Let's do it */
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this.construct();
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};
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$.extend( Scroller.prototype, {
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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* Public methods - to be exposed via the DataTables API
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*/
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/**
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* Calculate and store information about how many rows are to be displayed
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* in the scrolling viewport, based on current dimensions in the browser's
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* rendering. This can be particularly useful if the table is initially
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* drawn in a hidden element - for example in a tab.
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* @param {bool} [redraw=true] Redraw the table automatically after the recalculation, with
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* the new dimensions forming the basis for the draw.
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* @returns {void}
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*/
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measure: function ( redraw )
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{
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if ( this.s.autoHeight )
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{
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this._calcRowHeight();
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}
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var heights = this.s.heights;
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if ( heights.row ) {
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heights.viewport = this._parseHeight($(this.dom.scroller).css('max-height'));
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this.s.viewportRows = parseInt( heights.viewport / heights.row, 10 )+1;
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this.s.dt._iDisplayLength = this.s.viewportRows * this.s.displayBuffer;
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}
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var label = this.dom.label.outerHeight();
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heights.xbar = this.dom.scroller.offsetHeight - this.dom.scroller.clientHeight;
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heights.labelHeight = label;
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if ( redraw === undefined || redraw )
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{
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this.s.dt.oInstance.fnDraw( false );
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}
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},
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/**
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* Get information about current displayed record range. This corresponds to
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* the information usually displayed in the "Info" block of the table.
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*
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* @returns {object} info as an object:
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* {
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* start: {int}, // the 0-indexed record at the top of the viewport
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* end: {int}, // the 0-indexed record at the bottom of the viewport
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* }
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*/
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pageInfo: function()
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{
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var
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dt = this.s.dt,
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iScrollTop = this.dom.scroller.scrollTop,
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iTotal = dt.fnRecordsDisplay(),
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iPossibleEnd = Math.ceil(this.pixelsToRow(iScrollTop + this.s.heights.viewport, false, this.s.ani));
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return {
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start: Math.floor(this.pixelsToRow(iScrollTop, false, this.s.ani)),
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end: iTotal < iPossibleEnd ? iTotal-1 : iPossibleEnd-1
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};
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},
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/**
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* Calculate the row number that will be found at the given pixel position
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* (y-scroll).
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*
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* Please note that when the height of the full table exceeds 1 million
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* pixels, Scroller switches into a non-linear mode for the scrollbar to fit
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* all of the records into a finite area, but this function returns a linear
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* value (relative to the last non-linear positioning).
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* @param {int} pixels Offset from top to calculate the row number of
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* @param {int} [intParse=true] If an integer value should be returned
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* @param {int} [virtual=false] Perform the calculations in the virtual domain
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* @returns {int} Row index
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*/
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pixelsToRow: function ( pixels, intParse, virtual )
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{
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var diff = pixels - this.s.baseScrollTop;
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var row = virtual ?
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(this._domain( 'physicalToVirtual', this.s.baseScrollTop ) + diff) / this.s.heights.row :
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( diff / this.s.heights.row ) + this.s.baseRowTop;
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return intParse || intParse === undefined ?
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parseInt( row, 10 ) :
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row;
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},
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/**
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* Calculate the pixel position from the top of the scrolling container for
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* a given row
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* @param {int} iRow Row number to calculate the position of
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* @returns {int} Pixels
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*/
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rowToPixels: function ( rowIdx, intParse, virtual )
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{
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var pixels;
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var diff = rowIdx - this.s.baseRowTop;
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if ( virtual ) {
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pixels = this._domain( 'virtualToPhysical', this.s.baseScrollTop );
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pixels += diff * this.s.heights.row;
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}
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else {
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pixels = this.s.baseScrollTop;
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pixels += diff * this.s.heights.row;
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}
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return intParse || intParse === undefined ?
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parseInt( pixels, 10 ) :
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pixels;
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},
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/**
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* Calculate the row number that will be found at the given pixel position (y-scroll)
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* @param {int} row Row index to scroll to
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* @param {bool} [animate=true] Animate the transition or not
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* @returns {void}
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*/
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scrollToRow: function ( row, animate )
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{
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var that = this;
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var ani = false;
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var px = this.rowToPixels( row );
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// We need to know if the table will redraw or not before doing the
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// scroll. If it will not redraw, then we need to use the currently
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// displayed table, and scroll with the physical pixels. Otherwise, we
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// need to calculate the table's new position from the virtual
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// transform.
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var preRows = ((this.s.displayBuffer-1)/2) * this.s.viewportRows;
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var drawRow = row - preRows;
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if ( drawRow < 0 ) {
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drawRow = 0;
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}
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if ( (px > this.s.redrawBottom || px < this.s.redrawTop) && this.s.dt._iDisplayStart !== drawRow ) {
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ani = true;
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px = this._domain( 'virtualToPhysical', row * this.s.heights.row );
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// If we need records outside the current draw region, but the new
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// scrolling position is inside that (due to the non-linear nature
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// for larger numbers of records), we need to force position update.
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if ( this.s.redrawTop < px && px < this.s.redrawBottom ) {
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this.s.forceReposition = true;
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animate = false;
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}
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}
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if ( animate === undefined || animate )
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{
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this.s.ani = ani;
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$(this.dom.scroller).animate( {
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"scrollTop": px
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}, function () {
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// This needs to happen after the animation has completed and
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// the final scroll event fired
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setTimeout( function () {
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that.s.ani = false;
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}, 250 );
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} );
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}
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else
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{
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$(this.dom.scroller).scrollTop( px );
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}
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},
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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* Constructor
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*/
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/**
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* Initialisation for Scroller
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* @returns {void}
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* @private
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*/
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construct: function ()
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{
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var that = this;
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var dt = this.s.dtApi;
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/* Sanity check */
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if ( !this.s.dt.oFeatures.bPaginate ) {
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this.s.dt.oApi._fnLog( this.s.dt, 0, 'Pagination must be enabled for Scroller' );
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return;
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}
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/* Insert a div element that we can use to force the DT scrolling container to
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* the height that would be required if the whole table was being displayed
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*/
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this.dom.force.style.position = "relative";
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this.dom.force.style.top = "0px";
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this.dom.force.style.left = "0px";
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this.dom.force.style.width = "1px";
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this.dom.scroller = $('div.'+this.s.dt.oClasses.sScrollBody, this.s.dt.nTableWrapper)[0];
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this.dom.scroller.appendChild( this.dom.force );
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this.dom.scroller.style.position = "relative";
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this.dom.table = $('>table', this.dom.scroller)[0];
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this.dom.table.style.position = "absolute";
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this.dom.table.style.top = "0px";
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this.dom.table.style.left = "0px";
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// Add class to 'announce' that we are a Scroller table
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$(dt.table().container()).addClass('dts DTS');
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// Add a 'loading' indicator
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if ( this.s.loadingIndicator )
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{
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this.dom.loader = $('<div class="dataTables_processing dts_loading">'+this.s.dt.oLanguage.sLoadingRecords+'</div>')
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.css('display', 'none');
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$(this.dom.scroller.parentNode)
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.css('position', 'relative')
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.append( this.dom.loader );
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}
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this.dom.label.appendTo(this.dom.scroller);
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/* Initial size calculations */
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if ( this.s.heights.row && this.s.heights.row != 'auto' )
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{
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this.s.autoHeight = false;
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}
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// Scrolling callback to see if a page change is needed
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this.s.ingnoreScroll = true;
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$(this.dom.scroller).on( 'scroll.dt-scroller', function (e) {
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that._scroll.call( that );
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} );
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// In iOS we catch the touchstart event in case the user tries to scroll
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// while the display is already scrolling
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$(this.dom.scroller).on('touchstart.dt-scroller', function () {
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that._scroll.call( that );
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} );
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$(this.dom.scroller)
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.on('mousedown.dt-scroller', function () {
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that.s.mousedown = true;
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})
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.on('mouseup.dt-scroller', function () {
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that.s.labelVisible = false;
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that.s.mousedown = false;
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that.dom.label.css('display', 'none');
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});
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// On resize, update the information element, since the number of rows shown might change
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$(window).on( 'resize.dt-scroller', function () {
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that.measure( false );
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that._info();
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} );
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// Add a state saving parameter to the DT state saving so we can restore the exact
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// position of the scrolling.
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var initialStateSave = true;
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var loadedState = dt.state.loaded();
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dt.on( 'stateSaveParams.scroller', function ( e, settings, data ) {
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if ( initialStateSave && loadedState ) {
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data.scroller = loadedState.scroller;
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initialStateSave = false;
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}
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else {
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// Need to used the saved position on init
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data.scroller = {
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topRow: that.s.topRowFloat,
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baseScrollTop: that.s.baseScrollTop,
|
|
baseRowTop: that.s.baseRowTop,
|
|
scrollTop: that.s.lastScrollTop
|
|
};
|
|
}
|
|
} );
|
|
|
|
if ( loadedState && loadedState.scroller ) {
|
|
this.s.topRowFloat = loadedState.scroller.topRow;
|
|
this.s.baseScrollTop = loadedState.scroller.baseScrollTop;
|
|
this.s.baseRowTop = loadedState.scroller.baseRowTop;
|
|
}
|
|
|
|
this.measure( false );
|
|
|
|
that.s.stateSaveThrottle = that.s.dt.oApi._fnThrottle( function () {
|
|
that.s.dtApi.state.save();
|
|
}, 500 );
|
|
|
|
dt.on( 'init.scroller', function () {
|
|
that.measure( false );
|
|
|
|
// Setting to `jump` will instruct _draw to calculate the scroll top
|
|
// position
|
|
that.s.scrollType = 'jump';
|
|
that._draw();
|
|
|
|
// Update the scroller when the DataTable is redrawn
|
|
dt.on( 'draw.scroller', function () {
|
|
that._draw();
|
|
});
|
|
} );
|
|
|
|
// Set height before the draw happens, allowing everything else to update
|
|
// on draw complete without worry for roder.
|
|
dt.on( 'preDraw.dt.scroller', function () {
|
|
that._scrollForce();
|
|
} );
|
|
|
|
// Destructor
|
|
dt.on( 'destroy.scroller', function () {
|
|
$(window).off( 'resize.dt-scroller' );
|
|
$(that.dom.scroller).off('.dt-scroller');
|
|
$(that.s.dt.nTable).off( '.scroller' );
|
|
|
|
$(that.s.dt.nTableWrapper).removeClass('DTS');
|
|
$('div.DTS_Loading', that.dom.scroller.parentNode).remove();
|
|
|
|
that.dom.table.style.position = "";
|
|
that.dom.table.style.top = "";
|
|
that.dom.table.style.left = "";
|
|
} );
|
|
},
|
|
|
|
|
|
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
|
|
* Private methods
|
|
*/
|
|
|
|
/**
|
|
* Automatic calculation of table row height. This is just a little tricky here as using
|
|
* initialisation DataTables has tale the table out of the document, so we need to create
|
|
* a new table and insert it into the document, calculate the row height and then whip the
|
|
* table out.
|
|
* @returns {void}
|
|
* @private
|
|
*/
|
|
_calcRowHeight: function ()
|
|
{
|
|
var dt = this.s.dt;
|
|
var origTable = dt.nTable;
|
|
var nTable = origTable.cloneNode( false );
|
|
var tbody = $('<tbody/>').appendTo( nTable );
|
|
var container = $(
|
|
'<div class="'+dt.oClasses.sWrapper+' DTS">'+
|
|
'<div class="'+dt.oClasses.sScrollWrapper+'">'+
|
|
'<div class="'+dt.oClasses.sScrollBody+'"></div>'+
|
|
'</div>'+
|
|
'</div>'
|
|
);
|
|
|
|
// Want 3 rows in the sizing table so :first-child and :last-child
|
|
// CSS styles don't come into play - take the size of the middle row
|
|
$('tbody tr:lt(4)', origTable).clone().appendTo( tbody );
|
|
var rowsCount = $('tr', tbody).length;
|
|
|
|
if ( rowsCount === 1 ) {
|
|
tbody.prepend('<tr><td> </td></tr>');
|
|
tbody.append('<tr><td> </td></tr>');
|
|
}
|
|
else {
|
|
for (; rowsCount < 3; rowsCount++) {
|
|
tbody.append('<tr><td> </td></tr>');
|
|
}
|
|
}
|
|
|
|
$('div.'+dt.oClasses.sScrollBody, container).append( nTable );
|
|
|
|
// If initialised using `dom`, use the holding element as the insert point
|
|
var insertEl = this.s.dt.nHolding || origTable.parentNode;
|
|
|
|
if ( ! $(insertEl).is(':visible') ) {
|
|
insertEl = 'body';
|
|
}
|
|
|
|
// Remove form element links as they might select over others (particularly radio and checkboxes)
|
|
container.find("input").removeAttr("name");
|
|
|
|
container.appendTo( insertEl );
|
|
this.s.heights.row = $('tr', tbody).eq(1).outerHeight();
|
|
|
|
container.remove();
|
|
},
|
|
|
|
/**
|
|
* Draw callback function which is fired when the DataTable is redrawn. The main function of
|
|
* this method is to position the drawn table correctly the scrolling container for the rows
|
|
* that is displays as a result of the scrolling position.
|
|
* @returns {void}
|
|
* @private
|
|
*/
|
|
_draw: function ()
|
|
{
|
|
var
|
|
that = this,
|
|
heights = this.s.heights,
|
|
iScrollTop = this.dom.scroller.scrollTop,
|
|
iTableHeight = $(this.s.dt.nTable).height(),
|
|
displayStart = this.s.dt._iDisplayStart,
|
|
displayLen = this.s.dt._iDisplayLength,
|
|
displayEnd = this.s.dt.fnRecordsDisplay();
|
|
|
|
// Disable the scroll event listener while we are updating the DOM
|
|
this.s.skip = true;
|
|
|
|
// If paging is reset
|
|
if ( (this.s.dt.bSorted || this.s.dt.bFiltered) && displayStart === 0 && !this.s.dt._drawHold ) {
|
|
this.s.topRowFloat = 0;
|
|
}
|
|
|
|
iScrollTop = this.s.scrollType === 'jump' ?
|
|
this._domain( 'virtualToPhysical', this.s.topRowFloat * heights.row ) :
|
|
iScrollTop;
|
|
|
|
// Store positional information so positional calculations can be based
|
|
// upon the current table draw position
|
|
this.s.baseScrollTop = iScrollTop;
|
|
this.s.baseRowTop = this.s.topRowFloat;
|
|
|
|
// Position the table in the virtual scroller
|
|
var tableTop = iScrollTop - ((this.s.topRowFloat - displayStart) * heights.row);
|
|
if ( displayStart === 0 ) {
|
|
tableTop = 0;
|
|
}
|
|
else if ( displayStart + displayLen >= displayEnd ) {
|
|
tableTop = heights.scroll - iTableHeight;
|
|
}
|
|
|
|
this.dom.table.style.top = tableTop+'px';
|
|
|
|
/* Cache some information for the scroller */
|
|
this.s.tableTop = tableTop;
|
|
this.s.tableBottom = iTableHeight + this.s.tableTop;
|
|
|
|
// Calculate the boundaries for where a redraw will be triggered by the
|
|
// scroll event listener
|
|
var boundaryPx = (iScrollTop - this.s.tableTop) * this.s.boundaryScale;
|
|
this.s.redrawTop = iScrollTop - boundaryPx;
|
|
this.s.redrawBottom = iScrollTop + boundaryPx > heights.scroll - heights.viewport - heights.row ?
|
|
heights.scroll - heights.viewport - heights.row :
|
|
iScrollTop + boundaryPx;
|
|
|
|
this.s.skip = false;
|
|
|
|
// Restore the scrolling position that was saved by DataTable's state
|
|
// saving Note that this is done on the second draw when data is Ajax
|
|
// sourced, and the first draw when DOM soured
|
|
if ( this.s.dt.oFeatures.bStateSave && this.s.dt.oLoadedState !== null &&
|
|
typeof this.s.dt.oLoadedState.scroller != 'undefined' )
|
|
{
|
|
// A quirk of DataTables is that the draw callback will occur on an
|
|
// empty set if Ajax sourced, but not if server-side processing.
|
|
var ajaxSourced = (this.s.dt.sAjaxSource || that.s.dt.ajax) && ! this.s.dt.oFeatures.bServerSide ?
|
|
true :
|
|
false;
|
|
|
|
if ( ( ajaxSourced && this.s.dt.iDraw == 2) ||
|
|
(!ajaxSourced && this.s.dt.iDraw == 1) )
|
|
{
|
|
setTimeout( function () {
|
|
$(that.dom.scroller).scrollTop( that.s.dt.oLoadedState.scroller.scrollTop );
|
|
|
|
// In order to prevent layout thrashing we need another
|
|
// small delay
|
|
setTimeout( function () {
|
|
that.s.ingnoreScroll = false;
|
|
}, 0 );
|
|
}, 0 );
|
|
}
|
|
}
|
|
else {
|
|
that.s.ingnoreScroll = false;
|
|
}
|
|
|
|
// Because of the order of the DT callbacks, the info update will
|
|
// take precedence over the one we want here. So a 'thread' break is
|
|
// needed. Only add the thread break if bInfo is set
|
|
if ( this.s.dt.oFeatures.bInfo ) {
|
|
setTimeout( function () {
|
|
that._info.call( that );
|
|
}, 0 );
|
|
}
|
|
|
|
$(this.s.dt.nTable).triggerHandler('position.dts.dt', tableTop);
|
|
|
|
// Hide the loading indicator
|
|
if ( this.dom.loader && this.s.loaderVisible ) {
|
|
this.dom.loader.css( 'display', 'none' );
|
|
this.s.loaderVisible = false;
|
|
}
|
|
},
|
|
|
|
/**
|
|
* Convert from one domain to another. The physical domain is the actual
|
|
* pixel count on the screen, while the virtual is if we had browsers which
|
|
* had scrolling containers of infinite height (i.e. the absolute value)
|
|
*
|
|
* @param {string} dir Domain transform direction, `virtualToPhysical` or
|
|
* `physicalToVirtual`
|
|
* @returns {number} Calculated transform
|
|
* @private
|
|
*/
|
|
_domain: function ( dir, val )
|
|
{
|
|
var heights = this.s.heights;
|
|
var diff;
|
|
var magic = 10000; // the point at which the non-linear calculations start to happen
|
|
|
|
// If the virtual and physical height match, then we use a linear
|
|
// transform between the two, allowing the scrollbar to be linear
|
|
if ( heights.virtual === heights.scroll ) {
|
|
return val;
|
|
}
|
|
|
|
// In the first 10k pixels and the last 10k pixels, we want the scrolling
|
|
// to be linear. After that it can be non-linear. It would be unusual for
|
|
// anyone to mouse wheel through that much.
|
|
if ( val < magic ) {
|
|
return val;
|
|
}
|
|
else if ( dir === 'virtualToPhysical' && val >= heights.virtual - magic ) {
|
|
diff = heights.virtual - val;
|
|
return heights.scroll - diff;
|
|
}
|
|
else if ( dir === 'physicalToVirtual' && val >= heights.scroll - magic ) {
|
|
diff = heights.scroll - val;
|
|
return heights.virtual - diff;
|
|
}
|
|
|
|
// Otherwise, we want a non-linear scrollbar to take account of the
|
|
// redrawing regions at the start and end of the table, otherwise these
|
|
// can stutter badly - on large tables 30px (for example) scroll might
|
|
// be hundreds of rows, so the table would be redrawing every few px at
|
|
// the start and end. Use a simple linear eq. to stop this, effectively
|
|
// causing a kink in the scrolling ratio. It does mean the scrollbar is
|
|
// non-linear, but with such massive data sets, the scrollbar is going
|
|
// to be a best guess anyway
|
|
var m = (heights.virtual - magic - magic) / (heights.scroll - magic - magic);
|
|
var c = magic - (m*magic);
|
|
|
|
return dir === 'virtualToPhysical' ?
|
|
(val-c) / m :
|
|
(m*val) + c;
|
|
},
|
|
|
|
/**
|
|
* Update any information elements that are controlled by the DataTable based on the scrolling
|
|
* viewport and what rows are visible in it. This function basically acts in the same way as
|
|
* _fnUpdateInfo in DataTables, and effectively replaces that function.
|
|
* @returns {void}
|
|
* @private
|
|
*/
|
|
_info: function ()
|
|
{
|
|
if ( !this.s.dt.oFeatures.bInfo )
|
|
{
|
|
return;
|
|
}
|
|
|
|
var
|
|
dt = this.s.dt,
|
|
language = dt.oLanguage,
|
|
iScrollTop = this.dom.scroller.scrollTop,
|
|
iStart = Math.floor( this.pixelsToRow(iScrollTop, false, this.s.ani)+1 ),
|
|
iMax = dt.fnRecordsTotal(),
|
|
iTotal = dt.fnRecordsDisplay(),
|
|
iPossibleEnd = Math.ceil( this.pixelsToRow(iScrollTop+this.s.heights.viewport, false, this.s.ani) ),
|
|
iEnd = iTotal < iPossibleEnd ? iTotal : iPossibleEnd,
|
|
sStart = dt.fnFormatNumber( iStart ),
|
|
sEnd = dt.fnFormatNumber( iEnd ),
|
|
sMax = dt.fnFormatNumber( iMax ),
|
|
sTotal = dt.fnFormatNumber( iTotal ),
|
|
sOut;
|
|
|
|
if ( dt.fnRecordsDisplay() === 0 &&
|
|
dt.fnRecordsDisplay() == dt.fnRecordsTotal() )
|
|
{
|
|
/* Empty record set */
|
|
sOut = language.sInfoEmpty+ language.sInfoPostFix;
|
|
}
|
|
else if ( dt.fnRecordsDisplay() === 0 )
|
|
{
|
|
/* Empty record set after filtering */
|
|
sOut = language.sInfoEmpty +' '+
|
|
language.sInfoFiltered.replace('_MAX_', sMax)+
|
|
language.sInfoPostFix;
|
|
}
|
|
else if ( dt.fnRecordsDisplay() == dt.fnRecordsTotal() )
|
|
{
|
|
/* Normal record set */
|
|
sOut = language.sInfo.
|
|
replace('_START_', sStart).
|
|
replace('_END_', sEnd).
|
|
replace('_MAX_', sMax).
|
|
replace('_TOTAL_', sTotal)+
|
|
language.sInfoPostFix;
|
|
}
|
|
else
|
|
{
|
|
/* Record set after filtering */
|
|
sOut = language.sInfo.
|
|
replace('_START_', sStart).
|
|
replace('_END_', sEnd).
|
|
replace('_MAX_', sMax).
|
|
replace('_TOTAL_', sTotal) +' '+
|
|
language.sInfoFiltered.replace(
|
|
'_MAX_',
|
|
dt.fnFormatNumber(dt.fnRecordsTotal())
|
|
)+
|
|
language.sInfoPostFix;
|
|
}
|
|
|
|
var callback = language.fnInfoCallback;
|
|
if ( callback ) {
|
|
sOut = callback.call( dt.oInstance,
|
|
dt, iStart, iEnd, iMax, iTotal, sOut
|
|
);
|
|
}
|
|
|
|
var n = dt.aanFeatures.i;
|
|
if ( typeof n != 'undefined' )
|
|
{
|
|
for ( var i=0, iLen=n.length ; i<iLen ; i++ )
|
|
{
|
|
$(n[i]).html( sOut );
|
|
}
|
|
}
|
|
|
|
// DT doesn't actually (yet) trigger this event, but it will in future
|
|
$(dt.nTable).triggerHandler( 'info.dt' );
|
|
},
|
|
|
|
/**
|
|
* Parse CSS height property string as number
|
|
*
|
|
* An attempt is made to parse the string as a number. Currently supported units are 'px',
|
|
* 'vh', and 'rem'. 'em' is partially supported; it works as long as the parent element's
|
|
* font size matches the body element. Zero is returned for unrecognized strings.
|
|
* @param {string} cssHeight CSS height property string
|
|
* @returns {number} height
|
|
* @private
|
|
*/
|
|
_parseHeight: function(cssHeight) {
|
|
var height;
|
|
var matches = /^([+-]?(?:\d+(?:\.\d+)?|\.\d+))(px|em|rem|vh)$/.exec(cssHeight);
|
|
|
|
if (matches === null) {
|
|
return 0;
|
|
}
|
|
|
|
var value = parseFloat(matches[1]);
|
|
var unit = matches[2];
|
|
|
|
if ( unit === 'px' ) {
|
|
height = value;
|
|
}
|
|
else if ( unit === 'vh' ) {
|
|
height = ( value / 100 ) * $(window).height();
|
|
}
|
|
else if ( unit === 'rem' ) {
|
|
height = value * parseFloat($(':root').css('font-size'));
|
|
}
|
|
else if ( unit === 'em' ) {
|
|
height = value * parseFloat($('body').css('font-size'));
|
|
}
|
|
|
|
return height ?
|
|
height :
|
|
0;
|
|
},
|
|
|
|
/**
|
|
* Scrolling function - fired whenever the scrolling position is changed.
|
|
* This method needs to use the stored values to see if the table should be
|
|
* redrawn as we are moving towards the end of the information that is
|
|
* currently drawn or not. If needed, then it will redraw the table based on
|
|
* the new position.
|
|
* @returns {void}
|
|
* @private
|
|
*/
|
|
_scroll: function ()
|
|
{
|
|
var
|
|
that = this,
|
|
heights = this.s.heights,
|
|
iScrollTop = this.dom.scroller.scrollTop,
|
|
iTopRow;
|
|
|
|
if ( this.s.skip ) {
|
|
return;
|
|
}
|
|
|
|
if ( this.s.ingnoreScroll ) {
|
|
return;
|
|
}
|
|
|
|
if ( iScrollTop === this.s.lastScrollTop ) {
|
|
return;
|
|
}
|
|
|
|
/* If the table has been sorted or filtered, then we use the redraw that
|
|
* DataTables as done, rather than performing our own
|
|
*/
|
|
if ( this.s.dt.bFiltered || this.s.dt.bSorted ) {
|
|
this.s.lastScrollTop = 0;
|
|
return;
|
|
}
|
|
|
|
/* Update the table's information display for what is now in the viewport */
|
|
this._info();
|
|
|
|
/* We don't want to state save on every scroll event - that's heavy
|
|
* handed, so use a timeout to update the state saving only when the
|
|
* scrolling has finished
|
|
*/
|
|
clearTimeout( this.s.stateTO );
|
|
this.s.stateTO = setTimeout( function () {
|
|
that.s.dtApi.state.save();
|
|
}, 250 );
|
|
|
|
this.s.scrollType = Math.abs(iScrollTop - this.s.lastScrollTop) > heights.viewport ?
|
|
'jump' :
|
|
'cont';
|
|
|
|
this.s.topRowFloat = this.s.scrollType === 'cont' ?
|
|
this.pixelsToRow( iScrollTop, false, false ) :
|
|
this._domain( 'physicalToVirtual', iScrollTop ) / heights.row;
|
|
|
|
if ( this.s.topRowFloat < 0 ) {
|
|
this.s.topRowFloat = 0;
|
|
}
|
|
|
|
/* Check if the scroll point is outside the trigger boundary which would required
|
|
* a DataTables redraw
|
|
*/
|
|
if ( this.s.forceReposition || iScrollTop < this.s.redrawTop || iScrollTop > this.s.redrawBottom ) {
|
|
var preRows = Math.ceil( ((this.s.displayBuffer-1)/2) * this.s.viewportRows );
|
|
|
|
iTopRow = parseInt(this.s.topRowFloat, 10) - preRows;
|
|
this.s.forceReposition = false;
|
|
|
|
if ( iTopRow <= 0 ) {
|
|
/* At the start of the table */
|
|
iTopRow = 0;
|
|
}
|
|
else if ( iTopRow + this.s.dt._iDisplayLength > this.s.dt.fnRecordsDisplay() ) {
|
|
/* At the end of the table */
|
|
iTopRow = this.s.dt.fnRecordsDisplay() - this.s.dt._iDisplayLength;
|
|
if ( iTopRow < 0 ) {
|
|
iTopRow = 0;
|
|
}
|
|
}
|
|
else if ( iTopRow % 2 !== 0 ) {
|
|
// For the row-striping classes (odd/even) we want only to start
|
|
// on evens otherwise the stripes will change between draws and
|
|
// look rubbish
|
|
iTopRow++;
|
|
}
|
|
|
|
// Store calcuated value, in case the following condition is not met, but so
|
|
// that the draw function will still use it.
|
|
this.s.targetTop = iTopRow;
|
|
|
|
if ( iTopRow != this.s.dt._iDisplayStart ) {
|
|
/* Cache the new table position for quick lookups */
|
|
this.s.tableTop = $(this.s.dt.nTable).offset().top;
|
|
this.s.tableBottom = $(this.s.dt.nTable).height() + this.s.tableTop;
|
|
|
|
var draw = function () {
|
|
that.s.dt._iDisplayStart = that.s.targetTop;
|
|
that.s.dt.oApi._fnDraw( that.s.dt );
|
|
};
|
|
|
|
/* Do the DataTables redraw based on the calculated start point - note that when
|
|
* using server-side processing we introduce a small delay to not DoS the server...
|
|
*/
|
|
if ( this.s.dt.oFeatures.bServerSide ) {
|
|
this.s.forceReposition = true;
|
|
|
|
clearTimeout( this.s.drawTO );
|
|
this.s.drawTO = setTimeout( draw, this.s.serverWait );
|
|
}
|
|
else {
|
|
draw();
|
|
}
|
|
|
|
if ( this.dom.loader && ! this.s.loaderVisible ) {
|
|
this.dom.loader.css( 'display', 'block' );
|
|
this.s.loaderVisible = true;
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
this.s.topRowFloat = this.pixelsToRow( iScrollTop, false, true );
|
|
}
|
|
|
|
this.s.lastScrollTop = iScrollTop;
|
|
this.s.stateSaveThrottle();
|
|
|
|
if ( this.s.scrollType === 'jump' && this.s.mousedown ) {
|
|
this.s.labelVisible = true;
|
|
}
|
|
if (this.s.labelVisible) {
|
|
var labelFactor = (heights.viewport-heights.labelHeight - heights.xbar) / heights.scroll;
|
|
|
|
this.dom.label
|
|
.html( this.s.dt.fnFormatNumber( parseInt( this.s.topRowFloat, 10 )+1 ) )
|
|
.css( 'top', iScrollTop + (iScrollTop * labelFactor) )
|
|
.css( 'display', 'block' );
|
|
}
|
|
},
|
|
|
|
/**
|
|
* Force the scrolling container to have height beyond that of just the
|
|
* table that has been drawn so the user can scroll the whole data set.
|
|
*
|
|
* Note that if the calculated required scrolling height exceeds a maximum
|
|
* value (1 million pixels - hard-coded) the forcing element will be set
|
|
* only to that maximum value and virtual / physical domain transforms will
|
|
* be used to allow Scroller to display tables of any number of records.
|
|
* @returns {void}
|
|
* @private
|
|
*/
|
|
_scrollForce: function ()
|
|
{
|
|
var heights = this.s.heights;
|
|
var max = 1000000;
|
|
|
|
heights.virtual = heights.row * this.s.dt.fnRecordsDisplay();
|
|
heights.scroll = heights.virtual;
|
|
|
|
if ( heights.scroll > max ) {
|
|
heights.scroll = max;
|
|
}
|
|
|
|
// Minimum height so there is always a row visible (the 'no rows found'
|
|
// if reduced to zero filtering)
|
|
this.dom.force.style.height = heights.scroll > this.s.heights.row ?
|
|
heights.scroll+'px' :
|
|
this.s.heights.row+'px';
|
|
}
|
|
} );
|
|
|
|
|
|
|
|
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
|
|
* Statics
|
|
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
|
|
|
|
|
|
/**
|
|
* Scroller default settings for initialisation
|
|
* @namespace
|
|
* @name Scroller.defaults
|
|
* @static
|
|
*/
|
|
Scroller.defaults = {
|
|
/**
|
|
* Scroller uses the boundary scaling factor to decide when to redraw the table - which it
|
|
* typically does before you reach the end of the currently loaded data set (in order to
|
|
* allow the data to look continuous to a user scrolling through the data). If given as 0
|
|
* then the table will be redrawn whenever the viewport is scrolled, while 1 would not
|
|
* redraw the table until the currently loaded data has all been shown. You will want
|
|
* something in the middle - the default factor of 0.5 is usually suitable.
|
|
* @type float
|
|
* @default 0.5
|
|
* @static
|
|
*/
|
|
boundaryScale: 0.5,
|
|
|
|
/**
|
|
* The display buffer is what Scroller uses to calculate how many rows it should pre-fetch
|
|
* for scrolling. Scroller automatically adjusts DataTables' display length to pre-fetch
|
|
* rows that will be shown in "near scrolling" (i.e. just beyond the current display area).
|
|
* The value is based upon the number of rows that can be displayed in the viewport (i.e.
|
|
* a value of 1), and will apply the display range to records before before and after the
|
|
* current viewport - i.e. a factor of 3 will allow Scroller to pre-fetch 1 viewport's worth
|
|
* of rows before the current viewport, the current viewport's rows and 1 viewport's worth
|
|
* of rows after the current viewport. Adjusting this value can be useful for ensuring
|
|
* smooth scrolling based on your data set.
|
|
* @type int
|
|
* @default 7
|
|
* @static
|
|
*/
|
|
displayBuffer: 9,
|
|
|
|
/**
|
|
* Show (or not) the loading element in the background of the table. Note that you should
|
|
* include the dataTables.scroller.css file for this to be displayed correctly.
|
|
* @type boolean
|
|
* @default false
|
|
* @static
|
|
*/
|
|
loadingIndicator: false,
|
|
|
|
/**
|
|
* Scroller will attempt to automatically calculate the height of rows for it's internal
|
|
* calculations. However the height that is used can be overridden using this parameter.
|
|
* @type int|string
|
|
* @default auto
|
|
* @static
|
|
*/
|
|
rowHeight: "auto",
|
|
|
|
/**
|
|
* When using server-side processing, Scroller will wait a small amount of time to allow
|
|
* the scrolling to finish before requesting more data from the server. This prevents
|
|
* you from DoSing your own server! The wait time can be configured by this parameter.
|
|
* @type int
|
|
* @default 200
|
|
* @static
|
|
*/
|
|
serverWait: 200
|
|
};
|
|
|
|
Scroller.oDefaults = Scroller.defaults;
|
|
|
|
|
|
|
|
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
|
|
* Constants
|
|
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
|
|
|
|
/**
|
|
* Scroller version
|
|
* @type String
|
|
* @default See code
|
|
* @name Scroller.version
|
|
* @static
|
|
*/
|
|
Scroller.version = "2.0.5";
|
|
|
|
|
|
|
|
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
|
|
* Initialisation
|
|
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
|
|
|
|
// Attach a listener to the document which listens for DataTables initialisation
|
|
// events so we can automatically initialise
|
|
$(document).on( 'preInit.dt.dtscroller', function (e, settings) {
|
|
if ( e.namespace !== 'dt' ) {
|
|
return;
|
|
}
|
|
|
|
var init = settings.oInit.scroller;
|
|
var defaults = DataTable.defaults.scroller;
|
|
|
|
if ( init || defaults ) {
|
|
var opts = $.extend( {}, init, defaults );
|
|
|
|
if ( init !== false ) {
|
|
new Scroller( settings, opts );
|
|
}
|
|
}
|
|
} );
|
|
|
|
|
|
// Attach Scroller to DataTables so it can be accessed as an 'extra'
|
|
$.fn.dataTable.Scroller = Scroller;
|
|
$.fn.DataTable.Scroller = Scroller;
|
|
|
|
|
|
// DataTables 1.10 API method aliases
|
|
var Api = $.fn.dataTable.Api;
|
|
|
|
Api.register( 'scroller()', function () {
|
|
return this;
|
|
} );
|
|
|
|
// Undocumented and deprecated - is it actually useful at all?
|
|
Api.register( 'scroller().rowToPixels()', function ( rowIdx, intParse, virtual ) {
|
|
var ctx = this.context;
|
|
|
|
if ( ctx.length && ctx[0].oScroller ) {
|
|
return ctx[0].oScroller.rowToPixels( rowIdx, intParse, virtual );
|
|
}
|
|
// undefined
|
|
} );
|
|
|
|
// Undocumented and deprecated - is it actually useful at all?
|
|
Api.register( 'scroller().pixelsToRow()', function ( pixels, intParse, virtual ) {
|
|
var ctx = this.context;
|
|
|
|
if ( ctx.length && ctx[0].oScroller ) {
|
|
return ctx[0].oScroller.pixelsToRow( pixels, intParse, virtual );
|
|
}
|
|
// undefined
|
|
} );
|
|
|
|
// `scroller().scrollToRow()` is undocumented and deprecated. Use `scroller.toPosition()
|
|
Api.register( ['scroller().scrollToRow()', 'scroller.toPosition()'], function ( idx, ani ) {
|
|
this.iterator( 'table', function ( ctx ) {
|
|
if ( ctx.oScroller ) {
|
|
ctx.oScroller.scrollToRow( idx, ani );
|
|
}
|
|
} );
|
|
|
|
return this;
|
|
} );
|
|
|
|
Api.register( 'row().scrollTo()', function ( ani ) {
|
|
var that = this;
|
|
|
|
this.iterator( 'row', function ( ctx, rowIdx ) {
|
|
if ( ctx.oScroller ) {
|
|
var displayIdx = that
|
|
.rows( { order: 'applied', search: 'applied' } )
|
|
.indexes()
|
|
.indexOf( rowIdx );
|
|
|
|
ctx.oScroller.scrollToRow( displayIdx, ani );
|
|
}
|
|
} );
|
|
|
|
return this;
|
|
} );
|
|
|
|
Api.register( 'scroller.measure()', function ( redraw ) {
|
|
this.iterator( 'table', function ( ctx ) {
|
|
if ( ctx.oScroller ) {
|
|
ctx.oScroller.measure( redraw );
|
|
}
|
|
} );
|
|
|
|
return this;
|
|
} );
|
|
|
|
Api.register( 'scroller.page()', function() {
|
|
var ctx = this.context;
|
|
|
|
if ( ctx.length && ctx[0].oScroller ) {
|
|
return ctx[0].oScroller.pageInfo();
|
|
}
|
|
// undefined
|
|
} );
|
|
|
|
return Scroller;
|
|
}));
|