I'm looking on the web, but documentation is hard to come by. We all know the basic AJAX call using the browser's built-in XMLHttpRequest
object (assume a modern browser here):
var xmlHttp = new XMLHttpRequest(); // Assumes native object
xmlHttp.open("GET", "http://www.example.com", false);
xmlHttp.send("");
var statusCode = xmlHttp.status;
// Process it, and I'd love to know if the request timed out
So, is there a way that I can detect that the AJAX call timed out by inspecting the XMLHttpRequest object in the browser? Would I be advised to do something like window.setTimeout(function() { xmlHttp.abort() }, 30000);
?
UPDATE: Here's an example of how you can handle a timeout:
var xmlHttp = new XMLHttpRequest();
xmlHttp.open("GET", "http://www.example.com", true);
xmlHttp.onreadystatechange=function(){
if (xmlHttp.readyState == 4 && xmlHttp.status == 200) {
clearTimeout(xmlHttpTimeout);
alert(xmlHttp.responseText);
}
}
// Now that we're ready to handle the response, we can make the request
xmlHttp.send("");
// Timeout to abort in 5 seconds
var xmlHttpTimeout=setTimeout(ajaxTimeout,5000);
function ajaxTimeout(){
xmlHttp.abort();
alert("Request timed out");
}
In IE8, You can add a timeout event handler to the XMLHttpRequest
object.
var xmlHttp = new XMLHttpRequest();
xmlHttp.ontimeout = function(){
alert("request timed out");
}
I would recommend against making synchronous calls as your code implies and also recommend using a javascript framework to do this. jQuery is the most popular one. It makes your code more efficient, easier to maintain and cross-browser compatible.