--- /dev/null
+
+
+/**
+ * Save the state of a table in a cookie such that the page can be reloaded
+ * @param {object} oSettings dataTables settings object
+ * @memberof DataTable#oApi
+ */
+function _fnSaveState ( oSettings )
+{
+ if ( !oSettings.oFeatures.bStateSave || oSettings.bDestroying )
+ {
+ return;
+ }
+
+ /* Store the interesting variables */
+ var i, iLen, bInfinite=oSettings.oScroll.bInfinite;
+ var oState = {
+ "iCreate": new Date().getTime(),
+ "iStart": (bInfinite ? 0 : oSettings._iDisplayStart),
+ "iEnd": (bInfinite ? oSettings._iDisplayLength : oSettings._iDisplayEnd),
+ "iLength": oSettings._iDisplayLength,
+ "aaSorting": $.extend( true, [], oSettings.aaSorting ),
+ "oSearch": $.extend( true, {}, oSettings.oPreviousSearch ),
+ "aoSearchCols": $.extend( true, [], oSettings.aoPreSearchCols ),
+ "abVisCols": []
+ };
+
+ for ( i=0, iLen=oSettings.aoColumns.length ; i<iLen ; i++ )
+ {
+ oState.abVisCols.push( oSettings.aoColumns[i].bVisible );
+ }
+
+ _fnCallbackFire( oSettings, "aoStateSaveParams", 'stateSaveParams', [oSettings, oState] );
+
+ oSettings.fnStateSave.call( oSettings.oInstance, oSettings, oState );
+}
+
+
+/**
+ * Attempt to load a saved table state from a cookie
+ * @param {object} oSettings dataTables settings object
+ * @param {object} oInit DataTables init object so we can override settings
+ * @memberof DataTable#oApi
+ */
+function _fnLoadState ( oSettings, oInit )
+{
+ if ( !oSettings.oFeatures.bStateSave )
+ {
+ return;
+ }
+
+ var oData = oSettings.fnStateLoad.call( oSettings.oInstance, oSettings );
+ if ( !oData )
+ {
+ return;
+ }
+
+ /* Allow custom and plug-in manipulation functions to alter the saved data set and
+ * cancelling of loading by returning false
+ */
+ var abStateLoad = _fnCallbackFire( oSettings, 'aoStateLoadParams', 'stateLoadParams', [oSettings, oData] );
+ if ( $.inArray( false, abStateLoad ) !== -1 )
+ {
+ return;
+ }
+
+ /* Store the saved state so it might be accessed at any time */
+ oSettings.oLoadedState = $.extend( true, {}, oData );
+
+ /* Restore key features */
+ oSettings._iDisplayStart = oData.iStart;
+ oSettings.iInitDisplayStart = oData.iStart;
+ oSettings._iDisplayEnd = oData.iEnd;
+ oSettings._iDisplayLength = oData.iLength;
+ oSettings.aaSorting = oData.aaSorting.slice();
+ oSettings.saved_aaSorting = oData.aaSorting.slice();
+
+ /* Search filtering */
+ $.extend( oSettings.oPreviousSearch, oData.oSearch );
+ $.extend( true, oSettings.aoPreSearchCols, oData.aoSearchCols );
+
+ /* Column visibility state
+ * Pass back visibility settings to the init handler, but to do not here override
+ * the init object that the user might have passed in
+ */
+ oInit.saved_aoColumns = [];
+ for ( var i=0 ; i<oData.abVisCols.length ; i++ )
+ {
+ oInit.saved_aoColumns[i] = {};
+ oInit.saved_aoColumns[i].bVisible = oData.abVisCols[i];
+ }
+
+ _fnCallbackFire( oSettings, 'aoStateLoaded', 'stateLoaded', [oSettings, oData] );
+}
+
+
+/**
+ * Create a new cookie with a value to store the state of a table
+ * @param {string} sName name of the cookie to create
+ * @param {string} sValue the value the cookie should take
+ * @param {int} iSecs duration of the cookie
+ * @param {string} sBaseName sName is made up of the base + file name - this is the base
+ * @param {function} fnCallback User definable function to modify the cookie
+ * @memberof DataTable#oApi
+ */
+function _fnCreateCookie ( sName, sValue, iSecs, sBaseName, fnCallback )
+{
+ var date = new Date();
+ date.setTime( date.getTime()+(iSecs*1000) );
+
+ /*
+ * Shocking but true - it would appear IE has major issues with having the path not having
+ * a trailing slash on it. We need the cookie to be available based on the path, so we
+ * have to append the file name to the cookie name. Appalling. Thanks to vex for adding the
+ * patch to use at least some of the path
+ */
+ var aParts = window.location.pathname.split('/');
+ var sNameFile = sName + '_' + aParts.pop().replace(/[\/:]/g,"").toLowerCase();
+ var sFullCookie, oData;
+
+ if ( fnCallback !== null )
+ {
+ oData = (typeof $.parseJSON === 'function') ?
+ $.parseJSON( sValue ) : eval( '('+sValue+')' );
+ sFullCookie = fnCallback( sNameFile, oData, date.toGMTString(),
+ aParts.join('/')+"/" );
+ }
+ else
+ {
+ sFullCookie = sNameFile + "=" + encodeURIComponent(sValue) +
+ "; expires=" + date.toGMTString() +"; path=" + aParts.join('/')+"/";
+ }
+
+ /* Are we going to go over the cookie limit of 4KiB? If so, try to delete a cookies
+ * belonging to DataTables.
+ */
+ var
+ aCookies =document.cookie.split(';'),
+ iNewCookieLen = sFullCookie.split(';')[0].length,
+ aOldCookies = [];
+
+ if ( iNewCookieLen+document.cookie.length+10 > 4096 ) /* Magic 10 for padding */
+ {
+ for ( var i=0, iLen=aCookies.length ; i<iLen ; i++ )
+ {
+ if ( aCookies[i].indexOf( sBaseName ) != -1 )
+ {
+ /* It's a DataTables cookie, so eval it and check the time stamp */
+ var aSplitCookie = aCookies[i].split('=');
+ try {
+ oData = eval( '('+decodeURIComponent(aSplitCookie[1])+')' );
+
+ if ( oData && oData.iCreate )
+ {
+ aOldCookies.push( {
+ "name": aSplitCookie[0],
+ "time": oData.iCreate
+ } );
+ }
+ }
+ catch( e ) {}
+ }
+ }
+
+ // Make sure we delete the oldest ones first
+ aOldCookies.sort( function (a, b) {
+ return b.time - a.time;
+ } );
+
+ // Eliminate as many old DataTables cookies as we need to
+ while ( iNewCookieLen + document.cookie.length + 10 > 4096 ) {
+ if ( aOldCookies.length === 0 ) {
+ // Deleted all DT cookies and still not enough space. Can't state save
+ return;
+ }
+
+ var old = aOldCookies.pop();
+ document.cookie = old.name+"=; expires=Thu, 01-Jan-1970 00:00:01 GMT; path="+
+ aParts.join('/') + "/";
+ }
+ }
+
+ document.cookie = sFullCookie;
+}
+
+
+/**
+ * Read an old cookie to get a cookie with an old table state
+ * @param {string} sName name of the cookie to read
+ * @returns {string} contents of the cookie - or null if no cookie with that name found
+ * @memberof DataTable#oApi
+ */
+function _fnReadCookie ( sName )
+{
+ var
+ aParts = window.location.pathname.split('/'),
+ sNameEQ = sName + '_' + aParts[aParts.length-1].replace(/[\/:]/g,"").toLowerCase() + '=',
+ sCookieContents = document.cookie.split(';');
+
+ for( var i=0 ; i<sCookieContents.length ; i++ )
+ {
+ var c = sCookieContents[i];
+
+ while (c.charAt(0)==' ')
+ {
+ c = c.substring(1,c.length);
+ }
+
+ if (c.indexOf(sNameEQ) === 0)
+ {
+ return decodeURIComponent( c.substring(sNameEQ.length,c.length) );
+ }
+ }
+ return null;
+}
+
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