Firefox event.target问题

Question

Generally speaking, and if I recall correctly I've used this at least a dozen times before, but for some god-forsaken reason it doesn't work since this morning... Somebody have a clue?

JSFiddle Example

HTML:

<button id="testID" onclick="foo()">
test me
</button>

<button id="testID2" onclick="foo(this)">
test me 2
</button>

JS:

function foo(event){
alert(event.target.id);
}

Answer 1

In the first example, you pass undefined to event . In the second example, you pass the button to event .

If you want the event object, then you have to pass the event object. That's called event , but I don't know how standard it is for it to be created for intrinsic event attributes.

In general, you are better off binding your event handlers with JavaScript.

 function foo(event){ alert(event.target.id); } var buttons = document.querySelectorAll("button"); for (var i = 0; i < buttons.length; i++) { buttons[i].addEventListener("click", foo); } 

 <button id="testID"> test me </button> <button id="testID2"> test me 2 </button>