Question

The controls on aspx page are like this

Submitted
Submission Date

I want, if the check box is checked, then the textbox will be enabled I wrote

  if(chkSubmitted.Checked)
        {
            txtSubmissionDate.Enabled = true;
        }

in the page load event. But when the page is loaded this checkbox having no effect on. Whats going wrong?

Answer 1

If you want the action of clicking the checkbox to enable the textbox, you’ll need to do a postback when the box is checked by setting AutoPostBack="True":

<asp:CheckBox runat="server" ID="chkSubmitted" AutoPostBack="True" />

Or, you could use JavaScript:

<asp:CheckBox runat="server" ID="chkSubmitted" onclick="setSubmissionDateEnabled()" />

function setSubmissionDateEnabled()
{
    var chkSubmitted = document.getElementById("<%= chkSubmitted.ClientID %>");
    var txtSubmissionDate = document.getElementById("<%= txtSubmissionDate.ClientID %>");
    txtSubmissionDate.disabled = !chkSubmitted.checked;
}