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Editorial Team
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Asked: 2026-05-13T08:11:06+00:00

I have this simple code: <html> <body> <form name=f1> <asp:Label name=lbl runat=server Text=Label onclick=lblClick()></asp:Label>

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I have this simple code:

<html>
<body>

<form name="f1">
<asp:Label name="lbl"  runat="server" Text="Label" onclick="lblClick()"></asp:Label>
</form>

<script type="text/javascript">

function lblClick(){
document.f1.lbl.text="new text";}
</script>

</body>
</html>

It doesn’t work, it gives me:
Microsoft JScript runtime error: ‘document.getElementById(…)’ is null or not an object … ,
I can’t even change the label text ….why?!!!

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1 Answer

  1. Editorial Team

    let us remember that asp.net renames your controls for you.

    <form name="f1">
<asp:Label id="lbl" runat="server" Text="Label" onclick="lblClick()"></asp:Label>
</form>

<script type="text/javascript">

function lblClick(){
document.getElementById('<%=lbl.ClientId %>').innerHTML="new text";}
</script>

    Adamantium’s answer will also provide you the functionality you’re after.

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