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core.ajax.js
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core.ajax.js
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/**
* Create an Ajax call based on the table's settings, taking into account that
* parameters can have multiple forms, and backwards compatibility.
*
* @param {object} oSettings dataTables settings object
* @param {array} data Data to send to the server, required by
* DataTables - may be augmented by developer callbacks
* @param {function} fn Callback function to run when data is obtained
*/
function _fnBuildAjax( oSettings, data, fn )
{
// Compatibility with 1.9-, allow fnServerData and event to manipulate
_fnCallbackFire( oSettings, 'aoServerParams', 'serverParams', [data] );
// Convert to object based for 1.10+ if using the old array scheme which can
// come from server-side processing or serverParams
if ( data && $.isArray(data) ) {
var tmp = {};
var rbracket = /(.*?)\[\]$/;
$.each( data, function (key, val) {
var match = val.name.match(rbracket);
if ( match ) {
// Support for arrays
var name = match[0];
if ( ! tmp[ name ] ) {
tmp[ name ] = [];
}
tmp[ name ].push( val.value );
}
else {
tmp[val.name] = val.value;
}
} );
data = tmp;
}
var ajaxData;
var ajax = oSettings.ajax;
var instance = oSettings.oInstance;
var callback = function ( json ) {
_fnCallbackFire( oSettings, null, 'xhr', [oSettings, json, oSettings.jqXHR] );
fn( json );
};
if ( $.isPlainObject( ajax ) && ajax.data )
{
ajaxData = ajax.data;
var newData = $.isFunction( ajaxData ) ?
ajaxData( data, oSettings ) : // fn can manipulate data or return
ajaxData; // an object object or array to merge
// If the function returned something, use that alone
data = $.isFunction( ajaxData ) && newData ?
newData :
$.extend( true, data, newData );
// Remove the data property as we've resolved it already and don't want
// jQuery to do it again (it is restored at the end of the function)
delete ajax.data;
}
var baseAjax = {
"data": data,
"success": function (json) {
var error = json.error || json.sError;
if ( error ) {
_fnLog( oSettings, 0, error );
}
oSettings.json = json;
callback( json );
},
"dataType": "json",
"cache": false,
"type": oSettings.sServerMethod,
"error": function (xhr, error, thrown) {
var ret = _fnCallbackFire( oSettings, null, 'xhr', [oSettings, null, oSettings.jqXHR] );
if ( $.inArray( true, ret ) === -1 ) {
if ( error == "parsererror" ) {
_fnLog( oSettings, 0, 'Invalid JSON response', 1 );
}
else if ( xhr.readyState === 4 ) {
_fnLog( oSettings, 0, 'Ajax error', 7 );
}
}
_fnProcessingDisplay( oSettings, false );
}
};
// Store the data submitted for the API
oSettings.oAjaxData = data;
// Allow plug-ins and external processes to modify the data
_fnCallbackFire( oSettings, null, 'preXhr', [oSettings, data] );
if ( oSettings.fnServerData )
{
// DataTables 1.9- compatibility
oSettings.fnServerData.call( instance,
oSettings.sAjaxSource,
$.map( data, function (val, key) { // Need to convert back to 1.9 trad format
return { name: key, value: val };
} ),
callback,
oSettings
);
}
else if ( oSettings.sAjaxSource || typeof ajax === 'string' )
{
// DataTables 1.9- compatibility
oSettings.jqXHR = $.ajax( $.extend( baseAjax, {
url: ajax || oSettings.sAjaxSource
} ) );
}
else if ( $.isFunction( ajax ) )
{
// Is a function - let the caller define what needs to be done
oSettings.jqXHR = ajax.call( instance, data, callback, oSettings );
}
else
{
// Object to extend the base settings
oSettings.jqXHR = $.ajax( $.extend( baseAjax, ajax ) );
// Restore for next time around
ajax.data = ajaxData;
}
}
/**
* Update the table using an Ajax call
* @param {object} settings dataTables settings object
* @returns {boolean} Block the table drawing or not
* @memberof DataTable#oApi
*/
function _fnAjaxUpdate( settings )
{
if ( settings.bAjaxDataGet ) {
settings.iDraw++;
_fnProcessingDisplay( settings, true );
_fnBuildAjax(
settings,
_fnAjaxParameters( settings ),
function(json) {
_fnAjaxUpdateDraw( settings, json );
}
);
return false;
}
return true;
}
/**
* Build up the parameters in an object needed for a server-side processing
* request. Note that this is basically done twice, is different ways - a modern
* method which is used by default in DataTables 1.10 which uses objects and
* arrays, or the 1.9- method with is name / value pairs. 1.9 method is used if
* the sAjaxSource option is used in the initialisation, or the legacyAjax
* option is set.
* @param {object} oSettings dataTables settings object
* @returns {bool} block the table drawing or not
* @memberof DataTable#oApi
*/
function _fnAjaxParameters( settings )
{
var
columns = settings.aoColumns,
columnCount = columns.length,
features = settings.oFeatures,
preSearch = settings.oPreviousSearch,
preColSearch = settings.aoPreSearchCols,
i, data = [], dataProp, column, columnSearch,
sort = _fnSortFlatten( settings ),
displayStart = settings._iDisplayStart,
displayLength = features.bPaginate !== false ?
settings._iDisplayLength :
-1;
var param = function ( name, value ) {
data.push( { 'name': name, 'value': value } );
};
// DataTables 1.9- compatible method
param( 'sEcho', settings.iDraw );
param( 'iColumns', columnCount );
param( 'sColumns', _pluck( columns, 'sName' ).join(',') );
param( 'iDisplayStart', displayStart );
param( 'iDisplayLength', displayLength );
// DataTables 1.10+ method
var d = {
draw: settings.iDraw,
columns: [],
order: [],
start: displayStart,
length: displayLength,
search: {
value: preSearch.sSearch,
regex: preSearch.bRegex
}
};
for ( i=0 ; i<columnCount ; i++ ) {
column = columns[i];
columnSearch = preColSearch[i];
dataProp = typeof column.mData=="function" ? 'function' : column.mData ;
d.columns.push( {
data: dataProp,
name: column.sName,
searchable: column.bSearchable,
orderable: column.bSortable,
search: {
value: columnSearch.sSearch,
regex: columnSearch.bRegex
}
} );
param( "mDataProp_"+i, dataProp );
if ( features.bFilter ) {
param( 'sSearch_'+i, columnSearch.sSearch );
param( 'bRegex_'+i, columnSearch.bRegex );
param( 'bSearchable_'+i, column.bSearchable );
}
if ( features.bSort ) {
param( 'bSortable_'+i, column.bSortable );
}
}
if ( features.bFilter ) {
param( 'sSearch', preSearch.sSearch );
param( 'bRegex', preSearch.bRegex );
}
if ( features.bSort ) {
$.each( sort, function ( i, val ) {
d.order.push( { column: val.col, dir: val.dir } );
param( 'iSortCol_'+i, val.col );
param( 'sSortDir_'+i, val.dir );
} );
param( 'iSortingCols', sort.length );
}
// If the legacy.ajax parameter is null, then we automatically decide which
// form to use, based on sAjaxSource
var legacy = DataTable.ext.legacy.ajax;
if ( legacy === null ) {
return settings.sAjaxSource ? data : d;
}
// Otherwise, if legacy has been specified then we use that to decide on the
// form
return legacy ? data : d;
}
/**
* Data the data from the server (nuking the old) and redraw the table
* @param {object} oSettings dataTables settings object
* @param {object} json json data return from the server.
* @param {string} json.sEcho Tracking flag for DataTables to match requests
* @param {int} json.iTotalRecords Number of records in the data set, not accounting for filtering
* @param {int} json.iTotalDisplayRecords Number of records in the data set, accounting for filtering
* @param {array} json.aaData The data to display on this page
* @param {string} [json.sColumns] Column ordering (sName, comma separated)
* @memberof DataTable#oApi
*/
function _fnAjaxUpdateDraw ( settings, json )
{
// v1.10 uses camelCase variables, while 1.9 uses Hungarian notation.
// Support both
var compat = function ( old, modern ) {
return json[old] !== undefined ? json[old] : json[modern];
};
var data = _fnAjaxDataSrc( settings, json );
var draw = compat( 'sEcho', 'draw' );
var recordsTotal = compat( 'iTotalRecords', 'recordsTotal' );
var recordsFiltered = compat( 'iTotalDisplayRecords', 'recordsFiltered' );
if ( draw ) {
// Protect against out of sequence returns
if ( draw*1 < settings.iDraw ) {
return;
}
settings.iDraw = draw * 1;
}
_fnClearTable( settings );
settings._iRecordsTotal = parseInt(recordsTotal, 10);
settings._iRecordsDisplay = parseInt(recordsFiltered, 10);
for ( var i=0, ien=data.length ; i<ien ; i++ ) {
_fnAddData( settings, data[i] );
}
settings.aiDisplay = settings.aiDisplayMaster.slice();
settings.bAjaxDataGet = false;
_fnDraw( settings );
if ( ! settings._bInitComplete ) {
_fnInitComplete( settings, json );
}
settings.bAjaxDataGet = true;
_fnProcessingDisplay( settings, false );
}
/**
* Get the data from the JSON data source to use for drawing a table. Using
* `_fnGetObjectDataFn` allows the data to be sourced from a property of the
* source object, or from a processing function.
* @param {object} oSettings dataTables settings object
* @param {object} json Data source object / array from the server
* @return {array} Array of data to use
*/
function _fnAjaxDataSrc ( oSettings, json )
{
var dataSrc = $.isPlainObject( oSettings.ajax ) && oSettings.ajax.dataSrc !== undefined ?
oSettings.ajax.dataSrc :
oSettings.sAjaxDataProp; // Compatibility with 1.9-.
// Compatibility with 1.9-. In order to read from aaData, check if the
// default has been changed, if not, check for aaData
if ( dataSrc === 'data' ) {
return json.aaData || json[dataSrc];
}
return dataSrc !== "" ?
_fnGetObjectDataFn( dataSrc )( json ) :
json;
}