text: /*! Scroller 2.0.1
   * ©2011-2019 SpryMedia Ltd - datatables.net/license
   */
  
  /**
   * @summary     Scroller
   * @description Virtual rendering for DataTables
   * @version     2.0.1
   * @file        dataTables.scroller.js
   * @author      SpryMedia Ltd (www.sprymedia.co.uk)
   * @contact     www.sprymedia.co.uk/contact
   * @copyright   Copyright 2011-2019 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:
   *   <ul class="limit_length">
   *     <li>Speed! The aim of Scroller for DataTables is to make rendering large data sets fast</li>
   *     <li>Full compatibility with deferred rendering in DataTables for maximum speed</li>
   *     <li>Display millions of rows</li>
   *     <li>Integration with state saving in DataTables (scrolling position is saved)</li>
   *     <li>Easy to use</li>
   *   </ul>
   *
   *  @class
   *  @constructor
   *  @global
   *  @param {object} dt DataTables settings object or API instance
   *  @param {object} [opts={}] Configuration object for FixedColumns. 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,
  
  		/**
  		 * 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,
  			labelFactor: 1
  		},
  
  		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":    $('<div class="dts_label">0</div>'),
  		"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 = $.contains(document, this.dom.scroller) ?
  				this.dom.scroller.clientHeight :
  				this._parseHeight($(this.dom.scroller).css('height'));
  
  			// If collapsed (no height) use the max-height parameter
  			if ( ! heights.viewport ) {
  				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.labelFactor = (heights.viewport-label) / heights.scroll;
  
  		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 = $('<div class="dataTables_processing dts_loading">'+this.s.dt.oLanguage.sLoadingRecords+'</div>')
  				.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;
  		}
  		this.measure( false );
  
  		// Scrolling callback to see if a page change is needed - use a throttled
  		// function for the save save callback so we aren't hitting it on every
  		// scroll
  		this.s.ingnoreScroll = true;
  		this.s.stateSaveThrottle = this.s.dt.oApi._fnThrottle( function () {
  			that.s.dtApi.state.save();
  		}, 500 );
  		$(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.mouseup = 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. Slightly surprisingly the scroll position isn't actually
  		// stored, but rather tha base units which are needed to calculate it. This allows for
  		// virtual scrolling as well.
  		var initialStateSave = true;
  		var loadedState = dt.state.loaded();
  
  		dt.on( 'stateSaveParams.scroller', function ( e, settings, data ) {
  			// Need to used the saved position on init
  			data.scroller = {
  				topRow: initialStateSave && loadedState && loadedState.scroller ?
  					loadedState.scroller.topRow :
  					that.s.topRowFloat,
  				baseScrollTop: that.s.baseScrollTop,
  				baseRowTop: that.s.baseRowTop
  			};
  
  			initialStateSave = false;
  		} );
  
  		if ( loadedState && loadedState.scroller ) {
  			this.s.topRowFloat = loadedState.scroller.topRow;
  			this.s.baseScrollTop = loadedState.scroller.baseScrollTop;
  			this.s.baseRowTop = loadedState.scroller.baseRowTop;
  		}
  
  		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>&#160;</td></tr>');
              tbody.append('<tr><td>&#160;</td></tr>');
  		}
  		else {
              for (; rowsCount < 3; rowsCount++) {
                  tbody.append('<tr><td>&#160;</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';
  		}
  
  		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_images 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.iScroller != '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.iScroller );
  					that.s.redrawTop = that.s.dt.oLoadedState.iScroller - (heights.viewport/2);
  
  					// 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 );
  		}
  
  		// 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++;
  			}
  
  
  			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 () {
  					if ( that.s.scrollDrawReq === null ) {
  						that.s.scrollDrawReq = iScrollTop;
  					}
  
  					that.s.dt._iDisplayStart = iTopRow;
  					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 ) {
  					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.dom.label
  				.html( this.s.dt.fnFormatNumber( parseInt( this.s.topRowFloat, 10 )+1 ) )
  				.css( 'top', iScrollTop + (iScrollTop * heights.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 = "2.0.1";
  
  
  
  /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
   * 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;
  }));
  