RadNumericTextBox - OnKeyPress is too early

[Kevin Schneider]

I have a situation where I need to have a numeric textbox hide/show a division on the page based on whether or not it is empty.  I can't do it onblur / onvaluechanged since it needs to be real-time while they are typing.

I can't use onkeypress either since it is too early and I can't use isEmpty() to validate that the textbox is empty or not.

What client event is available for this?

Thanks.

[Missing User]

Hello Kevin,


You can use the onkeyup event handler. The onkeyup event occurs when a keyboard key is released.

The following code example demonstrates how to achieve your goal:

       <asp:ScriptManager ID="ScriptManager1" runat="server" />
        <div>
            <script type="text/javascript">
            function keyup()
            {
                var radTextBox = $find("RadTextBox1");
                if (!radTextBox.get_textBoxValue())
                {
                    Sys.Debug.trace("Empty!");
                }
                else
                {
                    Sys.Debug.trace("Not Empty!")
                }

            }
            </script>

            <telerik:RadTextBox onkeyup="keyup()" ID="RadTextBox1" runat="server">
            </telerik:RadTextBox>

            <textarea id='TraceConsole' rows="10" cols="50" title="TraceConsole">
            </textarea>
        </div>

Kind regards,
Plamen
the Telerik team

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[jrit]

I have the same question, but I'm in an up to date version of AJAX controls. The solution proposed works the same as OnKeyPress, so is not effective.

[Dimo]

Hi Jarrett,

I tested the above code with the latest version of RadControls and it worked as expected. Please send us a sample page.

Kind regards,
Dimo
the Telerik team

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