How and when to notify user of AJAX call error/exception

1. How to check AJAX call error?
2. How to handle exception in AJAX call?
3. What triggers AJAX error?
4. How to display AJAX error message in jQuery?

How to check AJAX call error?

When there is an AJAX error response or the AJAX request times out, you'll want to log as much information as you have, including the error message that jQuery gives you, the url and the request data. $. ajax(url, "data": requestData, "type": "POST", "timeout": 5000 ) .

How to handle exception in AJAX call?

Example: We are going to see how to use AJAX fail() methods to handle the error in the HTTP requests. The fail() callback takes 3 parameters where the first parameter is a JSON error object, the second parameter is given a reason in text format and the last parameter is for the error thrown by the HTTP request.

What triggers AJAX error?

Whenever an Ajax request completes with an error, jQuery triggers the ajaxError event. Any and all handlers that have been registered with the . ajaxError() method are executed at this time. Note: This handler is not called for cross-domain script and cross-domain JSONP requests.

How to display AJAX error message in jQuery?

If it is a valid number then an alert message is displayed inside the jQuery AJAX Success event handler and if an exception occurs in the WebMethod, the thrown exception is caught inside the jQuery AJAX Error event handler and which makes a call to the OnError JavaScript function which processes and displays the ...