creating a jQuery Event Listener for when custom function is called

Question

I have a function, let call it: myFunction, that I use a lot. Most of the time, I don't care when it's called. However, sometimes, it would be nice to know when it is called so that I can perform certain actions. Is there a way that I can, without editing myFunction, create a listener in jQuery so that when myFunction is done, I can call another function?

for example:

<script>
var foo = "foo";
function myFunction() {
    foo += "bar";
}
function afterMyFunction() {
    alert(foo);
}

$(function() {
    #some sort of listener for when myFunction is done --- ???#

    myFunction();
});
</script>

I would want, when the page loads, for there to be an alert that simply says "foobar". This is obviously a simplified example, but it gets my point across... I hope.

possible duplicate of Jquery calling a callback function in a custom function — isherwood
– isherwood, Commented Sep 25, 2014 at 21:40

OxyDesign · Accepted Answer · 2014-09-25 21:45:38Z

0

Without editing the function, I don't know how. But with editing you can trigger a custom event like this :

JS

var foo = "foo";
function myFunction() {
    foo += "bar";
    $('body').trigger('myFunctionDone');
}
function afterMyFunction() {
    alert(foo);
}

$(function() {
    $('body').on('myFunctionDone',function(){
        console.log('done');
    });

    myFunction();
});

answered Sep 25, 2014 at 21:45

OxyDesign

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1 Comment

Brds Over a year ago

I knew about that, i just wasn't sure if there was a way to do what i asked in the original post. Like i said, most of the time, i don't care when the function is called... but on the rare occasions that i do, it'd be nice to be able to add a listener. Thanks for the response!

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