javascript event.target not working in mozilla

Question

<script type ='javascript'>
    function fun(userID) {
        var btn = event.target; // error 'event' undefine in mozilla 
        alert(btn.id);
    }
</script>

---

<asp:linkButton id ="target" style =" cursor:pointer" onclick ="fun('1')" >click here </asp:LinkButton>

I am new in JavaScript, I have written above code and this code is working fine in Google chrome but not working in Mozilla Firefox. can anyone suggest how to find control firing event?

Answer 1

Pass event to the function:

<asp:linkButton id ="target" style =" cursor:pointer" onclick ="fun(event, '1')" >click here </asp:LinkButton>

function fun(event, userID)
{
    event= event|| window.event;
    var btn = event.target; 
    alert(btn.id);
}

OR

Make sure your event is not undefined

function fun(userID)
{
    var e = event || window.event;
    var btn = e.target; 
    alert(btn.id);
}