/**
* Change the order of the table
* @param {object} oSettings dataTables settings object
* @param {bool} bApplyClasses optional - should we apply classes or not
* @memberof DataTable#oApi
* @todo This really needs split up!
*/
function _fnSort ( oSettings, bApplyClasses )
{
var
i, iLen, j, jLen, k, kLen,
sDataType, nTh,
aSort = [],
aiOrig = [],
oExtSort = DataTable.ext.oSort,
aoData = oSettings.aoData,
aoColumns = oSettings.aoColumns,
oAria = oSettings.oLanguage.oAria,
fnFormatter, aDataSort, data, iCol, sType, oSort,
iFormatters = 0,
aaNestedSort = ( oSettings.aaSortingFixed !== null ) ?
oSettings.aaSortingFixed.concat( oSettings.aaSorting ) :
oSettings.aaSorting.slice();
/* Flatten the aDataSort inner arrays into a single array, otherwise we have nested
* loops in multiple locations
*/
for ( i=0 ; i<aaNestedSort.length ; i++ )
{
aDataSort = aoColumns[ aaNestedSort[i][0] ].aDataSort;
for ( k=0, kLen=aDataSort.length ; k<kLen ; k++ )
{
iCol = aDataSort[k];
sType = aoColumns[ iCol ].sType || 'string';
fnFormatter = oExtSort[ sType+"-pre" ];
aSort.push( {
col: iCol,
dir: aaNestedSort[i][1],
index: aaNestedSort[i][2],
type: sType,
format: fnFormatter
} );
// Track if we can use the formatter method
if ( fnFormatter )
{
iFormatters++;
}
}
}
/* No sorting required if server-side or no sorting array */
if ( !oSettings.oFeatures.bServerSide && aSort.length !== 0 )
{
/* If there is a sorting data type, and a function belonging to it, then we need to
* get the data from the developer's function and apply it for this column
*/
for ( i=0 ; i<aSort.length ; i++ )
{
var iColumn = aSort[i].col;
var iVisColumn = _fnColumnIndexToVisible( oSettings, iColumn );
sDataType = oSettings.aoColumns[ iColumn ].sSortDataType;
if ( DataTable.ext.afnSortData[sDataType] )
{
var aData = DataTable.ext.afnSortData[sDataType].call(
oSettings.oInstance, oSettings, iColumn, iVisColumn
);
if ( aData.length === aoData.length )
{
for ( j=0, jLen=aoData.length ; j<jLen ; j++ )
{
_fnSetCellData( oSettings, j, iColumn, aData[j] );
}
}
else
{
_fnLog( oSettings, 0, "Returned data sort array (col "+iColumn+") is the wrong length" );
}
}
}
/* Create a value - key array of the current row positions such that we can use their
* current position during the sort, if values match, in order to perform stable sorting
*/
for ( i=0, iLen=oSettings.aiDisplayMaster.length ; i<iLen ; i++ )
{
aiOrig[ oSettings.aiDisplayMaster[i] ] = i;
}
/* Build an internal data array which is specific to the sort, so we can get and prep
* the data to be sorted only once, rather than needing to do it every time the sorting
* function runs. This make the sorting function a very simple comparison
*/
for ( j=0 ; j<aSort.length ; j++ )
{
oSort = aSort[j];
for ( i=0, iLen=aoData.length ; i<iLen ; i++ )
{
data = _fnGetCellData( oSettings, i, oSort.col, 'sort' );
aoData[i]._aSortData[ oSort.col ] = oSort.format ?
oSort.format( data ) :
data;
}
}
/* Do the sort - here we want multi-column sorting based on a given data source (column)
* and sorting function (from oSort) in a certain direction. It's reasonably complex to
* follow on it's own, but this is what we want (example two column sorting):
* fnLocalSorting = function(a,b){
* var iTest;
* iTest = oSort['string-asc']('data11', 'data12');
* if (iTest !== 0)
* return iTest;
* iTest = oSort['numeric-desc']('data21', 'data22');
* if (iTest !== 0)
* return iTest;
* return oSort['numeric-asc']( aiOrig[a], aiOrig[b] );
* }
* Basically we have a test for each sorting column, if the data in that column is equal,
* test the next column. If all columns match, then we use a numeric sort on the row
* positions in the original data array to provide a stable sort.
*
* Note - I know it seems excessive to have two sorting methods, but the first is around
* 15% faster, so the second is only maintained for backwards compatibility with sorting
* methods which do not have a pre-sort formatting function.
*/
if ( iFormatters === aSort.length ) {
// All sort types have formatting functions
oSettings.aiDisplayMaster.sort( function ( a, b ) {
var
x, y, k, test, sort,
len=aSort.length,
dataA = aoData[a]._aSortData,
dataB = aoData[b]._aSortData;
for ( k=0 ; k<len ; k++ )
{
sort = aSort[k];
x = dataA[ sort.col ];
y = dataB[ sort.col ];
test = x<y ? -1 : x>y ? 1 : 0;
if ( test !== 0 )
{
return sort.dir === 'asc' ? test : -test;
}
}
x = aiOrig[a];
y = aiOrig[b];
return x<y ? -1 : x>y ? 1 : 0;
} );
}
else {
// Depreciated - remove in 1.11 (providing a plug-in option)
// Not all sort types have formatting methods, so we have to call their sorting
// methods.
oSettings.aiDisplayMaster.sort( function ( a, b ) {
var
x, y, k, l, test, sort,
len=aSort.length,
dataA = aoData[a]._aSortData,
dataB = aoData[b]._aSortData;
for ( k=0 ; k<len ; k++ )
{
sort = aSort[k];
x = dataA[ sort.col ];
y = dataB[ sort.col ];
test = oExtSort[ sort.type+"-"+sort.dir ]( x, y );
if ( test !== 0 )
{
return test;
}
}
x = aiOrig[a];
y = aiOrig[b];
return x<y ? -1 : x>y ? 1 : 0;
} );
}
}
/* Alter the sorting classes to take account of the changes */
if ( (bApplyClasses === undefined || bApplyClasses) && !oSettings.oFeatures.bDeferRender )
{
_fnSortingClasses( oSettings );
}
for ( i=0, iLen=oSettings.aoColumns.length ; i<iLen ; i++ )
{
var sTitle = aoColumns[i].sTitle.replace( /<.*?>/g, "" );
nTh = aoColumns[i].nTh;
nTh.removeAttribute('aria-sort');
nTh.removeAttribute('aria-label');
/* In ARIA only the first sorting column can be marked as sorting - no multi-sort option */
if ( aoColumns[i].bSortable )
{
if ( aSort.length > 0 && aSort[0].col == i )
{
nTh.setAttribute('aria-sort', aSort[0].dir=="asc" ? "ascending" : "descending" );
var nextSort = (aoColumns[i].asSorting[ aSort[0].index+1 ]) ?
aoColumns[i].asSorting[ aSort[0].index+1 ] : aoColumns[i].asSorting[0];
nTh.setAttribute('aria-label', sTitle+
(nextSort=="asc" ? oAria.sSortAscending : oAria.sSortDescending) );
}
else
{
nTh.setAttribute('aria-label', sTitle+
(aoColumns[i].asSorting[0]=="asc" ? oAria.sSortAscending : oAria.sSortDescending) );
}
}
else
{
nTh.setAttribute('aria-label', sTitle);
}
}
/* Tell the draw function that we have sorted the data */
oSettings.bSorted = true;
$(oSettings.oInstance).trigger('sort', oSettings);
/* Copy the master data into the draw array and re-draw */
if ( oSettings.oFeatures.bFilter )
{
/* _fnFilter() will redraw the table for us */
_fnFilterComplete( oSettings, oSettings.oPreviousSearch, 1 );
}
else
{
oSettings.aiDisplay = oSettings.aiDisplayMaster.slice();
oSettings._iDisplayStart = 0; /* reset display back to page 0 */
_fnCalculateEnd( oSettings );
_fnDraw( oSettings );
}
}
/**
* Attach a sort handler (click) to a node
* @param {object} oSettings dataTables settings object
* @param {node} nNode node to attach the handler to
* @param {int} iDataIndex column sorting index
* @param {function} [fnCallback] callback function
* @memberof DataTable#oApi
*/
function _fnSortAttachListener ( oSettings, nNode, iDataIndex, fnCallback )
{
_fnBindAction( nNode, {}, function (e) {
/* If the column is not sortable - don't to anything */
if ( oSettings.aoColumns[iDataIndex].bSortable === false )
{
return;
}
/*
* This is a little bit odd I admit... I declare a temporary function inside the scope of
* _fnBuildHead and the click handler in order that the code presented here can be used
* twice - once for when bProcessing is enabled, and another time for when it is
* disabled, as we need to perform slightly different actions.
* Basically the issue here is that the Javascript engine in modern browsers don't
* appear to allow the rendering engine to update the display while it is still executing
* it's thread (well - it does but only after long intervals). This means that the
* 'processing' display doesn't appear for a table sort. To break the js thread up a bit
* I force an execution break by using setTimeout - but this breaks the expected
* thread continuation for the end-developer's point of view (their code would execute
* too early), so we only do it when we absolutely have to.
*/
var fnInnerSorting = function () {
var iColumn, iNextSort;
/* If the shift key is pressed then we are multiple column sorting */
if ( e.shiftKey )
{
/* Are we already doing some kind of sort on this column? */
var bFound = false;
for ( var i=0 ; i<oSettings.aaSorting.length ; i++ )
{
if ( oSettings.aaSorting[i][0] == iDataIndex )
{
bFound = true;
iColumn = oSettings.aaSorting[i][0];
iNextSort = oSettings.aaSorting[i][2]+1;
if ( !oSettings.aoColumns[iColumn].asSorting[iNextSort] )
{
/* Reached the end of the sorting options, remove from multi-col sort */
oSettings.aaSorting.splice( i, 1 );
}
else
{
/* Move onto next sorting direction */
oSettings.aaSorting[i][1] = oSettings.aoColumns[iColumn].asSorting[iNextSort];
oSettings.aaSorting[i][2] = iNextSort;
}
break;
}
}
/* No sort yet - add it in */
if ( bFound === false )
{
oSettings.aaSorting.push( [ iDataIndex,
oSettings.aoColumns[iDataIndex].asSorting[0], 0 ] );
}
}
else
{
/* If no shift key then single column sort */
if ( oSettings.aaSorting.length == 1 && oSettings.aaSorting[0][0] == iDataIndex )
{
iColumn = oSettings.aaSorting[0][0];
iNextSort = oSettings.aaSorting[0][2]+1;
if ( !oSettings.aoColumns[iColumn].asSorting[iNextSort] )
{
iNextSort = 0;
}
oSettings.aaSorting[0][1] = oSettings.aoColumns[iColumn].asSorting[iNextSort];
oSettings.aaSorting[0][2] = iNextSort;
}
else
{
oSettings.aaSorting.splice( 0, oSettings.aaSorting.length );
oSettings.aaSorting.push( [ iDataIndex,
oSettings.aoColumns[iDataIndex].asSorting[0], 0 ] );
}
}
/* Run the sort */
_fnSort( oSettings );
}; /* /fnInnerSorting */
if ( !oSettings.oFeatures.bProcessing )
{
fnInnerSorting();
}
else
{
_fnProcessingDisplay( oSettings, true );
setTimeout( function() {
fnInnerSorting();
if ( !oSettings.oFeatures.bServerSide )
{
_fnProcessingDisplay( oSettings, false );
}
}, 0 );
}
/* Call the user specified callback function - used for async user interaction */
if ( typeof fnCallback == 'function' )
{
fnCallback( oSettings );
}
} );
}
/**
* Set the sorting classes on the header, Note: it is safe to call this function
* when bSort and bSortClasses are false
* @param {object} oSettings dataTables settings object
* @memberof DataTable#oApi
*/
function _fnSortingClasses( oSettings )
{
var i, iLen, j, jLen, iFound;
var aaSort, sClass;
var iColumns = oSettings.aoColumns.length;
var oClasses = oSettings.oClasses;
for ( i=0 ; i<iColumns ; i++ )
{
if ( oSettings.aoColumns[i].bSortable )
{
$(oSettings.aoColumns[i].nTh).removeClass( oClasses.sSortAsc +" "+ oClasses.sSortDesc +
" "+ oSettings.aoColumns[i].sSortingClass );
}
}
if ( oSettings.aaSortingFixed !== null )
{
aaSort = oSettings.aaSortingFixed.concat( oSettings.aaSorting );
}
else
{
aaSort = oSettings.aaSorting.slice();
}
/* Apply the required classes to the header */
for ( i=0 ; i<oSettings.aoColumns.length ; i++ )
{
if ( oSettings.aoColumns[i].bSortable )
{
sClass = oSettings.aoColumns[i].sSortingClass;
iFound = -1;
for ( j=0 ; j<aaSort.length ; j++ )
{
if ( aaSort[j][0] == i )
{
sClass = ( aaSort[j][1] == "asc" ) ?
oClasses.sSortAsc : oClasses.sSortDesc;
iFound = j;
break;
}
}
$(oSettings.aoColumns[i].nTh).addClass( sClass );
if ( oSettings.bJUI )
{
/* jQuery UI uses extra markup */
var jqSpan = $("span."+oClasses.sSortIcon, oSettings.aoColumns[i].nTh);
jqSpan.removeClass(oClasses.sSortJUIAsc +" "+ oClasses.sSortJUIDesc +" "+
oClasses.sSortJUI +" "+ oClasses.sSortJUIAscAllowed +" "+ oClasses.sSortJUIDescAllowed );
var sSpanClass;
if ( iFound == -1 )
{
sSpanClass = oSettings.aoColumns[i].sSortingClassJUI;
}
else if ( aaSort[iFound][1] == "asc" )
{
sSpanClass = oClasses.sSortJUIAsc;
}
else
{
sSpanClass = oClasses.sSortJUIDesc;
}
jqSpan.addClass( sSpanClass );
}
}
else
{
/* No sorting on this column, so add the base class. This will have been assigned by
* _fnAddColumn
*/
$(oSettings.aoColumns[i].nTh).addClass( oSettings.aoColumns[i].sSortingClass );
}
}
/*
* Apply the required classes to the table body
* Note that this is given as a feature switch since it can significantly slow down a sort
* on large data sets (adding and removing of classes is always slow at the best of times..)
* Further to this, note that this code is admittedly fairly ugly. It could be made a lot
* simpler using jQuery selectors and add/removeClass, but that is significantly slower
* (on the order of 5 times slower) - hence the direct DOM manipulation here.
* Note that for deferred drawing we do use jQuery - the reason being that taking the first
* row found to see if the whole column needs processed can miss classes since the first
* column might be new.
*/
sClass = oClasses.sSortColumn;
if ( oSettings.oFeatures.bSort && oSettings.oFeatures.bSortClasses )
{
var nTds = _fnGetTdNodes( oSettings );
/* Determine what the sorting class for each column should be */
var iClass, iTargetCol;
var asClasses = [];
for (i = 0; i < iColumns; i++)
{
asClasses.push("");
}
for (i = 0, iClass = 1; i < aaSort.length; i++)
{
iTargetCol = parseInt( aaSort[i][0], 10 );
asClasses[iTargetCol] = sClass + iClass;
if ( iClass < 3 )
{
iClass++;
}
}
/* Make changes to the classes for each cell as needed */
var reClass = new RegExp(sClass + "[123]");
var sTmpClass, sCurrentClass, sNewClass;
for ( i=0, iLen=nTds.length; i<iLen; i++ )
{
/* Determine which column we're looking at */
iTargetCol = i % iColumns;
/* What is the full list of classes now */
sCurrentClass = nTds[i].className;
/* What sorting class should be applied? */
sNewClass = asClasses[iTargetCol];
/* What would the new full list be if we did a replacement? */
sTmpClass = sCurrentClass.replace(reClass, sNewClass);
if ( sTmpClass != sCurrentClass )
{
/* We changed something */
nTds[i].className = $.trim( sTmpClass );
}
else if ( sNewClass.length > 0 && sCurrentClass.indexOf(sNewClass) == -1 )
{
/* We need to add a class */
nTds[i].className = sCurrentClass + " " + sNewClass;
}
}
}
}
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