jQuery - Append an event handler to preexisting click event

I know this is an old post, but perhaps this can still help someone since I still managed to stumble across this question during my search...

I am trying to do same kind of thing except I want my action to trigger BEFORE the existing inline onClick events. This is what I've done so far and it seems to be working ok after my initial tests. It probably won't handle events that aren't inline, such as those bound by other javascipt.

        $(function() {
            $("[onClick]").each(function(){
                var x = $(this).attr("onClick");
                $(this).removeAttr("onClick").unbind("click");
                $(this).click(function(e){
                    // do what you want here...
                    eval(x); // do original action here...
                });
            });
        });

The only thing you can do is to attach another (additional) handler:

$(".HwYesButton", "#HwQuizQuestions").click(function() {
    // something else
});

jQuery will call the handlers in the order in which they have been attached to the element.

You cannot "extend" the already defined handler.

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Btw. your formulation is a bit imprecise. You are not defining a click event. You are only attaching click event handlers. The click event is generated by the browser when the user clicks on some element.

You can have as many click handlers as you want for one element. Maybe you are used to this in plain JavaScript:

element.onclick = function() {}

With this method you can indeed only attach one handler. But JavaScript provides some advanced event handling methods which I assume jQuery makes use of.