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// Ajax mode: abort
// usage: $.ajax({ mode: "abort"[, port: "uniqueport"]});
// $.ajaxAbort( port );
// if mode:"abort" is used, the previous request on that port (port can be undefined) is aborted via XMLHttpRequest.abort()
var pendingRequests = {},
ajax;
// Use a prefilter if available (1.5+)
if ( $.ajaxPrefilter ) {
$.ajaxPrefilter( function( settings, _, xhr ) {
var port = settings.port;
if ( settings.mode === "abort" ) {
$.ajaxAbort( port );
pendingRequests[ port ] = xhr;
}
} );
} else {
// Proxy ajax
ajax = $.ajax;
$.ajax = function( settings ) {
var mode = ( "mode" in settings ? settings : $.ajaxSettings ).mode,
port = ( "port" in settings ? settings : $.ajaxSettings ).port;
if ( mode === "abort" ) {
$.ajaxAbort( port );
pendingRequests[ port ] = ajax.apply( this, arguments );
return pendingRequests[ port ];
}
return ajax.apply( this, arguments );
};
}
// Abort the previous request without sending a new one
$.ajaxAbort = function( port ) {
if ( pendingRequests[ port ] ) {
pendingRequests[ port ].abort();
delete pendingRequests[ port ];
}
};
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