event.returnValue is deprecated. Please use the standard event.preventDefault() instead

Question

I have this script:

<script>
$(document).ready(function () {
    $("#changeResumeStatus").click(function () {
        $.get("{% url 'main:changeResumeStatus' %}", function (data) {
            if (data['message'] == 'hidden') {
                $("#resumeStatus").text("скрыто");
            } else {
                $("#resumeStatus").text("опубликовано");
            }
        }, "json");
    });
});
</script>

I receive the following error in my Google Chrome console:

event.returnValue is deprecated. Please use the standard event.preventDefault() instead.

I am using jQuery v1.10.2 and #changeResumeStatus is a <span> .

What's wrong with my script?

Answer 1

This is only a warning: your code still works, but probably won't work in the future as the method is deprecated. See the relevant source of Chromium and corresponding patch .

This has already been recognised and fixed in jQuery 1.11 (see here and here ).

Answer 2

Just for other's reference, I just received this and found it was due to AngularJS . It's for backwards compatibility:

if (!event.preventDefault) {
    event.preventDefault = function() {
        event.returnValue = false; //ie
    };
}

Answer 3

If you using Bootstrap :

The current version of Bootstrap (3.0.2) (with jQuery 1.10.2 & Chrome) seems to generate this warning as well.

(It does so on Twitter too, BTW.)

Update

The current version of Bootstrap (3.1.0) no longer seems to generate this warning.

Answer 4

That's your jQuery API problem, not your script. There is not much to worry about.

Answer 5

This is a warning related to the fact that most JavaScript frameworks (jQuery, Angular, YUI, Bootstrap...) offer backward support for old-nasty-most-hated Internet Explorer starting from IE8 down to IE6 :/

One day that backward compatibility support will be dropped (for IE8/7/6 since IE9 deals with it ), and you will no more see this warning (and other IEish bugs)..

It's a question of time (now IE8 has 10% worldwide share, once it reaches 1% it is DEAD ), meanwhile, just ignore the warning and stay zen :)

Answer 6

I saw this warning on many websites. Also, I saw that YUI 3 library also gives the same warning. It's a warning generated from the library (whether is it jQuery or YUI).

Answer 7

I found that using the latest version will fix this problem:
http://code.jquery.com/jquery-git.js