XMLHttpRequest.onreadystatechange

The XMLHttpRequest.onreadystatechange property contains the event handler to be called when the readystatechange event is fired, that is every time the readyState property of the XMLHttpRequest changes. The callback is called from the user interface thread.

The readystatechange event will not be fired when an XMLHttpRequest request is canceled with the abort() method.

SyntaxEdit

XMLHttpRequest.onreadystatechange = callback;

Values

• callback is the function to be executed when the readyState changes.

ExampleEdit

var xmlhttp = new XMLHttpRequest(),
    method = "GET",
    url = "https://developer.mozilla.org/";

xmlhttp.open(method, url, true);
xmlhttp.onreadystatechange = function () {
        if(xmlhttp.readyState === XMLHttpRequest.DONE && xmlhttp.status === 200) console.log(xmlhttp.responseText);
    };
xmlhttp.send();

SpecificationsEdit

Browser compatibilityEdit

[1] Internet Explorer version 5 and 6 supported ajax calls using ActiveXObject().