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javascript - How to change onClick handler dynamically?

I'm sure there are a million posts about this out there, but surprisingly I'm having trouble finding something.

I have a simple script where I want to set the onClick handler for an <A> link on initialization of the page.

When I run this I immediately get a 'foo' alert box where I expected to only get an alert when I click on the link.

What stupid thing am I doing wrong? (I've tried click= and onClick=)...

<script language="javascript">

    function init(){

        document.getElementById("foo").click = new function() { alert('foo'); };
    }

</script>

<body onload="init()">
    <a id="foo" href=#>Click to run foo</a>
</body>

Edit: I changed my accepted answer to a jQuery answer. The answer by 'Már ?rlygsson' is technically the correct answer to my original question (click should be onclick and new should be removed) but I strongly discourage anyone from using 'document.getElementById(...) directly in their code - and to use jQuery instead.

See Question&Answers more detail:os

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Try:

document.getElementById("foo").onclick = function (){alert('foo');};

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