Checkbox inside an anchor click behavior

Consider following snippet:

<!DOCTYPE html>
<html>
    <head>
        <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js"></script>
    </head>
    <body>
        <form>
            <a id="a" href="http://google.com">Goooooogle</a>
        </form>
        <script>
            $(function() {
                var checkbox = $('<input type="checkbox"></input>');
                checkbox.prependTo($('#a'));
                checkbox.click(function(e) {
                    e.stopPropagation();
                    // do something useful
                });
            });
        </script>
    </body>
</html>

I want to get a checkbox inside <a>, and get following on-click behavior:

Toggle check mark normally as usual
Do something useful like AJAX-request
Stay on this page, i.e. not be redirected to an a href

Also I want to not override default behavior if I click anywhere in a, but not on checkbox. I.e. I want to allow to execute all event handlers associated with a click itself.

I thought that should be pretty easy, but I can't get desired behavior. Either:

I get redirected to Google if I put a code provided.
I don't get check mark toggled if I use e.preventDefault() of return false;. Furthermore in that case checkbox ignores explicit checkbox.attr('checked', 'checked') and all other possible ways to set the check mark.

Where is the catch?

UPD: This works as expected in Chrome, e.g. I'm not redirected on click, but fails in Firefox. Is there cross-browser way?

Well, it looks like a known Firefox bug, which leads to following link on checkbox click regardless of handlers' code. As a bit dirty workaround one can use:

var checkbox = $('<input type="checkbox"></input>');
checkbox.prependTo($('#a'));
checkbox.click(function(e) {
    setTimeout(function() { checkbox.prop('checked', !checkbox.prop('checked')); }, 10);       
    // do something useful on clicking checkbox and but not surrounding link
    return false;
});

I know this is an old question but some may still be curious since it was never really fully answered without a messy hack or workaround. All you have to do is simply check where the event's target originated.

So using your example (jsfiddle):

// Don't change pages if the user is just changing the checkbox
$("#a").click(function(e) {
    //e.preventDefault(); // Optional if you want to to keep the link from working normally

    alert("Click came from: " + e.target.tagName);
    if (e.target.tagName != "INPUT") {
        // do link
        alert("Doing link functionality");
    } else {
        // do something useful
        alert("Doing checkbox functionality");
    }
});

I Know this question is over 5 years old, but I had the same issue recently and the work-around I found was to add an onclick function to the checkbox and in that function call event.stopImmediatePropagation().

from w3schools: "The stopImmediatePropagation() method prevents other listeners of the same event from being called"

ie...the anchor.

function checkbox_onclick(event){
event.stopImmediatePropagation(); 
}

here's a modified script

var checkbox = $('<input type="checkbox"></input>');
var a = $('#a');
a.unbind("click").click(function(e) {
    e.preventDefault();
    checkbox.attr('checked', !checkbox.attr('checked'));
});
checkbox.prependTo(a);
checkbox.click(function(e) {
    e.stopPropagation();
    // do something useful 
});

i unbind the click event on the <a> and rebind it with a event to check/uncheck the checkbox and also prevent the default.

来源：https://stackoverflow.com/questions/8094483/checkbox-inside-an-anchor-click-behavior

标签

javascript

jquery

checkbox

event-bubbling