How do I handle concurrent AJAX requests?
With JavaScript you can have more than one AJAX request processing at a single time. In order to insure the proper post processing of code it is recommended that you use JavaScript Closures. The example below shows an XMLHttpRequest object abstracted by a JavaScript object called AJAXInteraction. As arguments you pass in the URL to call and the function to call when the processing is done.
With JavaScript you can have more than one AJAX request processing at a single time. In order to insure the proper post processing of code it is recommended that you use JavaScript Closures. The example below shows an XMLHttpRequest object abstracted by a JavaScript object called AJAXInteraction. As arguments you pass in the URL to call and the function to call when the processing is done. function AJAXInteraction(url, callback) { var req = init(); req.onreadystatechange = processRequest; function init() { if (window.XMLHttpRequest) { return new XMLHttpRequest(); } else if (window.ActiveXObject) { return new ActiveXObject(“Microsoft.XMLHTTP”); } } function processRequest () { if (req.readyState == 4) { if (req.status == 200) { if (callback) callback(req.responseXML); } } } this.doGet = function() { req.open(“GET”, url, true); req.send(null); } this.doPost = function(body) { req.open(“POST”, url, true); req.setRequestHeader(“Content-Type”, “application/x-www-form-urlencoded”); req.send(
With JavaScript you can have more than one AJAX request processing at a single time. In order to insure the proper post processing of code it is recommended that you use JavaScript Closures. The example below shows an XMLHttpRequest object abstracted by a JavaScript object called AJAXInteraction. As arguments you pass in the URL to call and the function to call when the processing is done. function AJAXInteraction(url, callback) { var req = init(); req.onreadystatechange = processRequest; function init() { if (window.XMLHttpRequest) { return new XMLHttpRequest(); } else if (window.ActiveXObject) { return new ActiveXObject(“Microsoft.XMLHTTP”); } } function processRequest () { if (req.readyState == 4) { if (req.status == 200) { if (callback) callback(req.responseXML); } } } this.doGet = function() { req.open(“GET”, url, true); req.send(null); } this.doPost = function(body) { req.open(“POST”, url, true); req.setRequestHeader(“Content-Type”, ” application/x-www-form-urlencoded”); req.send
With JavaScript you can have more than one AJAX request processing at a single time. In order to insure the proper post processing of code it is recommended that you use JavaScript Closures. The example below shows an XMLHttpRequest object abstracted by a JavaScript object called AJAXInteraction. As arguments you pass in the URL to call and the function to call when the processing is done. function AJAXInteraction(url, callback) { var req = init(); req.onreadystatechange = processRequest; function init() { if (window.XMLHttpRequest) { return new XMLHttpRequest(); } else if (window.ActiveXObject) { return new ActiveXObject(“Microsoft.XMLHTTP”); } } function processRequest () { if (req.readyState == 4) { if (req.status == 200) { if (callback) callback(req.responseXML); } } } this.doGet = function() { req.open(“GET”, url, true); req.send(null); } this.doPost = function(body) { req.open(“POST”, url, true); req.setRequestHeader(“Content-Type”, ” application/x-www-form-urlencoded”); req.send
