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/**
* 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;
}