enable textbox with checkbox checked with javascript

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3.50/5 (4 votes)

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HEllo - I am trying to enable/disable textbox when checkbox is checked (enable) or unchecked (disable). WIth the piece of code i have nothing is happening once the checkbox is checked/unchecked. Here is what I have:
<script type="text/javascript" language="javascript">
    function enableTextBox() {
        if (document.getElementById("chkAssociation").checked == true)
            document.getElementById("txtAddress").disabled = false;
        else
            document.getElementById("txtAddress").disabled = true;
    }
</script>
and than the control:
<asp:CheckBox Checked="false" OnChange="javascript:enableTextBox();" ID="chkAssociation"  runat="server" />&nbsp;&nbsp;
<asp:TextBox ID="txtAddress" Enabled="false" Text="Test" runat="server" />

Thanks for helping

Posted 20-Jan-11 3:57am

laziale

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2 solutions

Solution 1

Code is absolutely fine.

Hope you have added javascript at proper place, please refer this code snippet.

XML

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Untitled Page</title>
    <script type="text/javascript" language="javascript">
    function enableTextBox()
    {
        if (document.getElementById("chkAssociation").checked == true)
            document.getElementById("txtAddress").disabled = false;
        else
            document.getElementById("txtAddress").disabled = true;
    }
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:CheckBox Checked="false" OnChange="javascript:enableTextBox();" ID="chkAssociation"  runat="server" />
        <asp:TextBox ID="txtAddress" Enabled="false" Text="Test" runat="server" />
    </div>
    </form>
</body>
</html>

Posted 20-Jan-11 4:13am

Hemraj Gujar

Comments

laziale 20-Jan-11 10:35am

I have as part of web user control.

E.F. Nijboer 20-Jan-11 10:46am

Or somewhat shorter:
function enableTextBox()
{
document.getElementById("txtAddress").disabled = !document.getElementById("chkAssociation").checked;
}

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Manfred Rudolf Bihy · Accepted Answer · 2011-01-20T07:20:00

I spotted you problem. The ID attribute in the asp:checkbox tag is not the same as the ID attribute of the client side (HTML) tag. I'll try to rectify your code, but must say that since I can't try this out it might need some tweaking on your side:

XML

<script type="text/javascript" language="javascript">
    function enableTextBox() {
        var textBoxID = "<%= txtAddress.ClientID %>";
        if (document.getElementById("<%= chkAssociation.ClientID %>").checked == true)
            document.getElementById(textBoxID).disabled = false;
        else
            document.getElementById(textBoxID).disabled = true;
    }
</script>
and than the control:
<asp:CheckBox Checked="false" OnChange="javascript:enableTextBox();" ID="chkAssociation"  runat="server" />
<asp:TextBox ID="txtAddress" Enabled="false" Text="Test" runat="server" />

You'll have to look it up really how the client ID is fetched from the control on the server side. It could be a property like I indicated, but might as well be a method. Main point is though that the ID attribute in the server side asp:textbox and asp:checkbox tags is NOT the same as the ID attribute that gets output into the rendered HTML.

Hope that helps you!

Best Regards,
Manfred