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var AjaxQueue = {
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batchSize: 1, //No.of simultaneous AJAX requests allowed, Default : 1
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urlQueue: [], //Request URLs will be pushed into this array
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elementsQueue: [], //Element IDs of elements to be updated on completion of a request
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optionsQueue: [], //Request options will be pushed into this array
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currentRequest: null,
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setBatchSize: function(bSize){ //Method to set a different batch size. Recommended: Set batchSize before making requests
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this.batchSize = bSize;
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},
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push: function(url, options, elementID){ //Push the request in the queue. elementID is optional and required only for Ajax requests that updates the element
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this.urlQueue.push(url);
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this.optionsQueue.push(options);
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if(elementID!=null){
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this.elementsQueue.push(elementID);
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} else {
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this.elementsQueue.push("NOTSPECIFIED");
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}
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this._processNext();
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},
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_processNext: function() { // Method for processing the requests in the queue. Private method. Don't call it explicitly
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if(this.currentRequest == null && this.urlQueue.length > 0) // Check if the currently processing request count is less than batch size
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{
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// Call jQuery.ajax on the first item in the queue and remove it from the queue
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AjaxQueue.currentRequest = jQuery.ajax(AjaxQueue.urlQueue.shift(), AjaxQueue.optionsQueue.shift());
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AjaxQueue.currentRequest.complete( function() {
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//Call AjaxQueue._processNext on completion ( success / failure) of this AJAX request.
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AjaxQueue.currentRequest = null;
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AjaxQueue._processNext();
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});
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if(this.elementsQueue[0]=="NOTSPECIFIED") { //Check if an elementID was specified
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// If no ElementID was specified remove the first item from the queue
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var junk = AjaxQueue.elementsQueue.shift();
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} else {
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// If ElementID was specified update the first item in the queue and remove it from the queue
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AjaxQueue.currentRequest.success( function(data) {
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jQuery(AjaxQueue.elementsQueue.shift()).html(data);
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});
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}
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}
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}
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};
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