How to update a control outside of an updatepanel? - asp.net

Question

I am going to show some text in a TextBox, which is located outside of an updatepanel, after checking a CheckBox but I cannot make it work. please help me out ?
Here is my code:
<asp:UpdatePanel runat="server" ID="uplMaster">
<ContentTemplate>
<asp:CheckBox ID="cbShowText" runat="server" Text="Show Some Text" AutoPostBack="true"
OnCheckedChanged="cbShowText_CheckedChanged" />
</ContentTemplate>
</asp:UpdatePanel>
<asp:TextBox ID="txtBox" Text="Empty" runat="server" />
Code Behind:
protected void cbShowText_CheckedChanged(object sender, EventArgs e)
{
txtBox.Text = "Some Text";
}
Thanks in advance :D
P.S. As you might have guessed, I have resembled my problem and that is why I don't want to put the TextBox in the UpdatePanel

Answer 1

I put the TextBox in another UpdatePanel and then called the Update method:
Here is my new code:
<asp:UpdatePanel runat="server" ID="uplMaster" UpdateMode="Always">
<ContentTemplate>
<asp:CheckBox ID="cbShowText" runat="server" Text="Show Some Text" AutoPostBack="true"
OnCheckedChanged="cbShowText_CheckedChanged" />
</ContentTemplate>
</asp:UpdatePanel>
<asp:UpdatePanel runat="server" ID="uplDetail" UpdateMode="Conditional">
<ContentTemplate>
<asp:TextBox ID="txtBox" Text="Empty" runat="server" />
</ContentTemplate>
</asp:UpdatePanel>
Code Behind:
protected void cbShowText_CheckedChanged(object sender, EventArgs e)
{
txtBox.Text = "Some Text";
uplDetail.Update();
}
Hope this helps

Answer 2

The textbox has to be in update panel also.
*Edit:
I am sorry I didn't read your question properly. Perhaps write a javascript function, and call the function from codebehind?

Answer 3

I know its been a while since this was asked, but here is what I did. Like #bla said write a javascript function and call it from code behind.
So in your checked changed call this. The changeText is a javascript function on your page in the header or in a script file.
protected void cbShowText_CheckedChanged(object sender, EventArgs e)
{
ScriptManager.RegisterStartupScript(this, GetType(), "Show Different Text", "changeText();", true);
}
Sample Javascript. Just gets called when checked changed event fires from code behind.
<script type="text/javascript">
function changeText() {
var txt= document.getElementById('<%= txtBox.ClientID %>');
var chk = document.getElementById('<%= cbShowText.ClientID %>');
if (chk.checked === true) {
txt.Text = "Something";
} else {
txt.Text = "Somethingelse";
}
}
</script>
Hope this helps someone.