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/**
* Save the state of a table
* @param {object} oSettings dataTables settings object
* @memberof DataTable#oApi
*/
function _fnSaveState ( settings )
{
if ( !settings.oFeatures.bStateSave || settings.bDestroying )
{
return;
}
/* Store the interesting variables */
var state = {
time: +new Date(),
start: settings._iDisplayStart,
length: settings._iDisplayLength,
order: $.extend( true, [], settings.aaSorting ),
search: _fnSearchToCamel( settings.oPreviousSearch ),
columns: $.map( settings.aoColumns, function ( col, i ) {
return {
visible: col.bVisible,
search: _fnSearchToCamel( settings.aoPreSearchCols[i] )
};
} )
};
_fnCallbackFire( settings, "aoStateSaveParams", 'stateSaveParams', [settings, state] );
settings.oSavedState = state;
settings.fnStateSaveCallback.call( settings.oInstance, settings, state );
}
/**
* Attempt to load a saved table state
* @param {object} oSettings dataTables settings object
* @param {object} oInit DataTables init object so we can override settings
* @param {function} callback Callback to execute when the state has been loaded
* @memberof DataTable#oApi
*/
function _fnLoadState ( settings, oInit, callback )
{
var i, ien;
var columns = settings.aoColumns;
var loaded = function ( s ) {
if ( ! s || ! s.time ) {
callback();
return;
}
// Allow custom and plug-in manipulation functions to alter the saved data set and
// cancelling of loading by returning false
var abStateLoad = _fnCallbackFire( settings, 'aoStateLoadParams', 'stateLoadParams', [settings, s] );
if ( $.inArray( false, abStateLoad ) !== -1 ) {
callback();
return;
}
// Reject old data
var duration = settings.iStateDuration;
if ( duration > 0 && s.time < +new Date() - (duration*1000) ) {
callback();
return;
}
// Number of columns have changed - all bets are off, no restore of settings
if ( s.columns && columns.length !== s.columns.length ) {
callback();
return;
}
// Store the saved state so it might be accessed at any time
settings.oLoadedState = $.extend( true, {}, s );
// Restore key features - todo - for 1.11 this needs to be done by
// subscribed events
if ( s.start !== undefined ) {
settings._iDisplayStart = s.start;
settings.iInitDisplayStart = s.start;
}
if ( s.length !== undefined ) {
settings._iDisplayLength = s.length;
}
// Order
if ( s.order !== undefined ) {
settings.aaSorting = [];
$.each( s.order, function ( i, col ) {
settings.aaSorting.push( col[0] >= columns.length ?
[ 0, col[1] ] :
col
);
} );
}
// Search
if ( s.search !== undefined ) {
$.extend( settings.oPreviousSearch, _fnSearchToHung( s.search ) );
}
// Columns
//
if ( s.columns ) {
for ( i=0, ien=s.columns.length ; i<ien ; i++ ) {
var col = s.columns[i];
// Visibility
if ( col.visible !== undefined ) {
columns[i].bVisible = col.visible;
}
// Search
if ( col.search !== undefined ) {
$.extend( settings.aoPreSearchCols[i], _fnSearchToHung( col.search ) );
}
}
}
_fnCallbackFire( settings, 'aoStateLoaded', 'stateLoaded', [settings, s] );
callback();
};
if ( ! settings.oFeatures.bStateSave ) {
callback();
return;
}
var state = settings.fnStateLoadCallback.call( settings.oInstance, settings, loaded );
if ( state !== undefined ) {
loaded( state );
}
// otherwise, wait for the loaded callback to be executed
}
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