Is it feasible to trigger an event whenever my webpage receives any AJAX response? I am currently working in SharePoint, where Microsoft initiates numerous AJAX calls to load data into webparts. I am interested in raising an event when my page gets an AJAX response to verify if the data has been successfully loaded into the webpart. Any assistance on this matter would be highly valued.
Check out this neat trick for monitoring XMLHttpRequest object activity by intercepting open() calls:
(function(){
var ajaxOpen=window.XMLHttpRequest.prototype.open;
window.XMLHttpRequest.prototype.open=function(m,u,a){
this.addEventListener("load", function(){ console.log("ajax loaded", new Date(), m, u, a ); });
return ajaxOpen.call(this,m,u,a);
};
}());
$.get("/", function(e){
console.log(e.length+" bytes fetched");
});
When used on a page, you'll see logs similar to the example below:
ajax loaded Fri May 30 2014 09:56:34 GMT-0500 (Central Daylight Time) POST /posts/23957352/edit-submit/b4dd7272-6618-4c79-9810-e8ff71122b51 true
It's worth noting that jQuery is only used here to demonstrate the broad impact on all ajax calls without altering any specific libraries or code. With some tweaks, this method can be expanded to capture additional information like data, response size, and call duration.
While there may be a slight increase in memory usage and potential compatibility issues with older browsers due to manipulation of "host objects," this approach can be valuable for debugging, testing, and performance evaluation purposes.
EDIT: I also discovered that modern browsers now support multiple event handlers using addEventListener(), allowing for logging of actual responses in the updated code above.
Upon sending a request to a server, we can take certain actions depending on the response received. The onreadystatechange event is fired each time the readyState of the XMLHttpRequest changes. This property indicates the current status of the request. Within the onreadystatechange event handler, we define what should happen once the server's response is ready for processing.
When the readyState is 4 and the status is 200, it signifies that the response is fully loaded:
The JavaScript snippet below checks if the response has been successfully received:
xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
document.getElementById("myDiv").innerHTML = xmlhttp.responseText;
}
}
The readyState property can take on different values reflecting the stages of our request:
0: Request not yet initialized
1: Server connection established
2: Request received by server
3: Request being processed
4: Request completed; response ready
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