/*! Scroller 2.0.5 * ©2011-2021 SpryMedia Ltd - datatables.net/license */ /** * @summary Scroller * @description Virtual rendering for DataTables * @version 2.0.5 * @file dataTables.scroller.js * @author SpryMedia Ltd (www.sprymedia.co.uk) * @contact www.sprymedia.co.uk/contact * @copyright Copyright 2011-2021 SpryMedia Ltd. * * This source file is free software, available under the following license: * MIT license - http://datatables.net/license/mit * * This source file is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY * or FITNESS FOR A PARTICULAR PURPOSE. See the license files for details. * * For details please refer to: http://www.datatables.net */ (function( factory ){ if ( typeof define === 'function' && define.amd ) { // AMD define( ['jquery', 'datatables.net'], function ( $ ) { return factory( $, window, document ); } ); } else if ( typeof exports === 'object' ) { // CommonJS module.exports = function (root, $) { if ( ! root ) { root = window; } if ( ! $ || ! $.fn.dataTable ) { $ = require('datatables.net')(root, $).$; } return factory( $, root, root.document ); }; } else { // Browser factory( jQuery, window, document ); } }(function( $, window, document, undefined ) { 'use strict'; var DataTable = $.fn.dataTable; /** * Scroller is a virtual rendering plug-in for DataTables which allows large * datasets to be drawn on screen every quickly. What the virtual rendering means * is that only the visible portion of the table (and a bit to either side to make * the scrolling smooth) is drawn, while the scrolling container gives the * visual impression that the whole table is visible. This is done by making use * of the pagination abilities of DataTables and moving the table around in the * scrolling container DataTables adds to the page. The scrolling container is * forced to the height it would be for the full table display using an extra * element. * * Note that rows in the table MUST all be the same height. Information in a cell * which expands on to multiple lines will cause some odd behaviour in the scrolling. * * Scroller is initialised by simply including the letter 'S' in the sDom for the * table you want to have this feature enabled on. Note that the 'S' must come * AFTER the 't' parameter in `dom`. * * Key features include: * * * @class * @constructor * @global * @param {object} dt DataTables settings object or API instance * @param {object} [opts={}] Configuration object for Scroller. Options * are defined by {@link Scroller.defaults} * * @requires jQuery 1.7+ * @requires DataTables 1.10.0+ * * @example * $(document).ready(function() { * $('#example').DataTable( { * "scrollY": "200px", * "ajax": "media/dataset/large.txt", * "scroller": true, * "deferRender": true * } ); * } ); */ var Scroller = function ( dt, opts ) { /* Sanity check - you just know it will happen */ if ( ! (this instanceof Scroller) ) { alert( "Scroller warning: Scroller must be initialised with the 'new' keyword." ); return; } if ( opts === undefined ) { opts = {}; } var dtApi = $.fn.dataTable.Api( dt ); /** * Settings object which contains customisable information for the Scroller instance * @namespace * @private * @extends Scroller.defaults */ this.s = { /** * DataTables settings object * @type object * @default Passed in as first parameter to constructor */ dt: dtApi.settings()[0], /** * DataTables API instance * @type DataTable.Api */ dtApi: dtApi, /** * Pixel location of the top of the drawn table in the viewport * @type int * @default 0 */ tableTop: 0, /** * Pixel location of the bottom of the drawn table in the viewport * @type int * @default 0 */ tableBottom: 0, /** * Pixel location of the boundary for when the next data set should be loaded and drawn * when scrolling up the way. * @type int * @default 0 * @private */ redrawTop: 0, /** * Pixel location of the boundary for when the next data set should be loaded and drawn * when scrolling down the way. Note that this is actually calculated as the offset from * the top. * @type int * @default 0 * @private */ redrawBottom: 0, /** * Auto row height or not indicator * @type bool * @default 0 */ autoHeight: true, /** * Number of rows calculated as visible in the visible viewport * @type int * @default 0 */ viewportRows: 0, /** * setTimeout reference for state saving, used when state saving is enabled in the DataTable * and when the user scrolls the viewport in order to stop the cookie set taking too much * CPU! * @type int * @default 0 */ stateTO: null, stateSaveThrottle: function () {}, /** * setTimeout reference for the redraw, used when server-side processing is enabled in the * DataTables in order to prevent DoSing the server * @type int * @default null */ drawTO: null, heights: { jump: null, page: null, virtual: null, scroll: null, /** * Height of rows in the table * @type int * @default 0 */ row: null, /** * Pixel height of the viewport * @type int * @default 0 */ viewport: null, labelHeight: 0, xbar: 0 }, topRowFloat: 0, scrollDrawDiff: null, loaderVisible: false, forceReposition: false, baseRowTop: 0, baseScrollTop: 0, mousedown: false, lastScrollTop: 0 }; // @todo The defaults should extend a `c` property and the internal settings // only held in the `s` property. At the moment they are mixed this.s = $.extend( this.s, Scroller.oDefaults, opts ); // Workaround for row height being read from height object (see above comment) this.s.heights.row = this.s.rowHeight; /** * DOM elements used by the class instance * @private * @namespace * */ this.dom = { "force": document.createElement('div'), "label": $('
0
'), "scroller": null, "table": null, "loader": null }; // Attach the instance to the DataTables instance so it can be accessed in // future. Don't initialise Scroller twice on the same table if ( this.s.dt.oScroller ) { return; } this.s.dt.oScroller = this; /* Let's do it */ this.construct(); }; $.extend( Scroller.prototype, { /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * Public methods - to be exposed via the DataTables API */ /** * Calculate and store information about how many rows are to be displayed * in the scrolling viewport, based on current dimensions in the browser's * rendering. This can be particularly useful if the table is initially * drawn in a hidden element - for example in a tab. * @param {bool} [redraw=true] Redraw the table automatically after the recalculation, with * the new dimensions forming the basis for the draw. * @returns {void} */ measure: function ( redraw ) { if ( this.s.autoHeight ) { this._calcRowHeight(); } var heights = this.s.heights; if ( heights.row ) { heights.viewport = this._parseHeight($(this.dom.scroller).css('max-height')); this.s.viewportRows = parseInt( heights.viewport / heights.row, 10 )+1; this.s.dt._iDisplayLength = this.s.viewportRows * this.s.displayBuffer; } var label = this.dom.label.outerHeight(); heights.xbar = this.dom.scroller.offsetHeight - this.dom.scroller.clientHeight; heights.labelHeight = label; if ( redraw === undefined || redraw ) { this.s.dt.oInstance.fnDraw( false ); } }, /** * Get information about current displayed record range. This corresponds to * the information usually displayed in the "Info" block of the table. * * @returns {object} info as an object: * { * start: {int}, // the 0-indexed record at the top of the viewport * end: {int}, // the 0-indexed record at the bottom of the viewport * } */ pageInfo: function() { var dt = this.s.dt, iScrollTop = this.dom.scroller.scrollTop, iTotal = dt.fnRecordsDisplay(), iPossibleEnd = Math.ceil(this.pixelsToRow(iScrollTop + this.s.heights.viewport, false, this.s.ani)); return { start: Math.floor(this.pixelsToRow(iScrollTop, false, this.s.ani)), end: iTotal < iPossibleEnd ? iTotal-1 : iPossibleEnd-1 }; }, /** * Calculate the row number that will be found at the given pixel position * (y-scroll). * * Please note that when the height of the full table exceeds 1 million * pixels, Scroller switches into a non-linear mode for the scrollbar to fit * all of the records into a finite area, but this function returns a linear * value (relative to the last non-linear positioning). * @param {int} pixels Offset from top to calculate the row number of * @param {int} [intParse=true] If an integer value should be returned * @param {int} [virtual=false] Perform the calculations in the virtual domain * @returns {int} Row index */ pixelsToRow: function ( pixels, intParse, virtual ) { var diff = pixels - this.s.baseScrollTop; var row = virtual ? (this._domain( 'physicalToVirtual', this.s.baseScrollTop ) + diff) / this.s.heights.row : ( diff / this.s.heights.row ) + this.s.baseRowTop; return intParse || intParse === undefined ? parseInt( row, 10 ) : row; }, /** * Calculate the pixel position from the top of the scrolling container for * a given row * @param {int} iRow Row number to calculate the position of * @returns {int} Pixels */ rowToPixels: function ( rowIdx, intParse, virtual ) { var pixels; var diff = rowIdx - this.s.baseRowTop; if ( virtual ) { pixels = this._domain( 'virtualToPhysical', this.s.baseScrollTop ); pixels += diff * this.s.heights.row; } else { pixels = this.s.baseScrollTop; pixels += diff * this.s.heights.row; } return intParse || intParse === undefined ? parseInt( pixels, 10 ) : pixels; }, /** * Calculate the row number that will be found at the given pixel position (y-scroll) * @param {int} row Row index to scroll to * @param {bool} [animate=true] Animate the transition or not * @returns {void} */ scrollToRow: function ( row, animate ) { var that = this; var ani = false; var px = this.rowToPixels( row ); // We need to know if the table will redraw or not before doing the // scroll. If it will not redraw, then we need to use the currently // displayed table, and scroll with the physical pixels. Otherwise, we // need to calculate the table's new position from the virtual // transform. var preRows = ((this.s.displayBuffer-1)/2) * this.s.viewportRows; var drawRow = row - preRows; if ( drawRow < 0 ) { drawRow = 0; } if ( (px > this.s.redrawBottom || px < this.s.redrawTop) && this.s.dt._iDisplayStart !== drawRow ) { ani = true; px = this._domain( 'virtualToPhysical', row * this.s.heights.row ); // If we need records outside the current draw region, but the new // scrolling position is inside that (due to the non-linear nature // for larger numbers of records), we need to force position update. if ( this.s.redrawTop < px && px < this.s.redrawBottom ) { this.s.forceReposition = true; animate = false; } } if ( animate === undefined || animate ) { this.s.ani = ani; $(this.dom.scroller).animate( { "scrollTop": px }, function () { // This needs to happen after the animation has completed and // the final scroll event fired setTimeout( function () { that.s.ani = false; }, 250 ); } ); } else { $(this.dom.scroller).scrollTop( px ); } }, /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * Constructor */ /** * Initialisation for Scroller * @returns {void} * @private */ construct: function () { var that = this; var dt = this.s.dtApi; /* Sanity check */ if ( !this.s.dt.oFeatures.bPaginate ) { this.s.dt.oApi._fnLog( this.s.dt, 0, 'Pagination must be enabled for Scroller' ); return; } /* Insert a div element that we can use to force the DT scrolling container to * the height that would be required if the whole table was being displayed */ this.dom.force.style.position = "relative"; this.dom.force.style.top = "0px"; this.dom.force.style.left = "0px"; this.dom.force.style.width = "1px"; this.dom.scroller = $('div.'+this.s.dt.oClasses.sScrollBody, this.s.dt.nTableWrapper)[0]; this.dom.scroller.appendChild( this.dom.force ); this.dom.scroller.style.position = "relative"; this.dom.table = $('>table', this.dom.scroller)[0]; this.dom.table.style.position = "absolute"; this.dom.table.style.top = "0px"; this.dom.table.style.left = "0px"; // Add class to 'announce' that we are a Scroller table $(dt.table().container()).addClass('dts DTS'); // Add a 'loading' indicator if ( this.s.loadingIndicator ) { this.dom.loader = $('
'+this.s.dt.oLanguage.sLoadingRecords+'
') .css('display', 'none'); $(this.dom.scroller.parentNode) .css('position', 'relative') .append( this.dom.loader ); } this.dom.label.appendTo(this.dom.scroller); /* Initial size calculations */ if ( this.s.heights.row && this.s.heights.row != 'auto' ) { this.s.autoHeight = false; } // Scrolling callback to see if a page change is needed this.s.ingnoreScroll = true; $(this.dom.scroller).on( 'scroll.dt-scroller', function (e) { that._scroll.call( that ); } ); // In iOS we catch the touchstart event in case the user tries to scroll // while the display is already scrolling $(this.dom.scroller).on('touchstart.dt-scroller', function () { that._scroll.call( that ); } ); $(this.dom.scroller) .on('mousedown.dt-scroller', function () { that.s.mousedown = true; }) .on('mouseup.dt-scroller', function () { that.s.labelVisible = false; that.s.mousedown = false; that.dom.label.css('display', 'none'); }); // On resize, update the information element, since the number of rows shown might change $(window).on( 'resize.dt-scroller', function () { that.measure( false ); that._info(); } ); // Add a state saving parameter to the DT state saving so we can restore the exact // position of the scrolling. var initialStateSave = true; var loadedState = dt.state.loaded(); dt.on( 'stateSaveParams.scroller', function ( e, settings, data ) { if ( initialStateSave && loadedState ) { data.scroller = loadedState.scroller; initialStateSave = false; } else { // Need to used the saved position on init data.scroller = { topRow: that.s.topRowFloat, 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 = $('').appendTo( nTable ); var container = $( '
'+ '
'+ '
'+ '
'+ '
' ); // 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(' '); tbody.append(' '); } else { for (; rowsCount < 3; rowsCount++) { tbody.append(' '); } } $('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 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; }));