Make label invisible when textbox empty

[Guest]

Hello -

I have a page that runs a stored procedure checking for the existence of a
name in a database. If it exists, lblMessage returns text indicating same.

When a user goes back and clears the textbox, I would like the message to
disappear, instead of waiting for a return trip to the server.

Any suggestions will be greatly appreciated!

 

[Eliyahu Goldin]

Sandy,

Setup a client side onchange event for the textbox. In the event check if
the textbox is empty and hide the label.

The javascript event handler will look like this:

function onchange(){
if (myTextBox.value == "") myLabel.style.display="hidden";}

Eliyahu

 

[Guest]

Hi Eliyahu!

Thanks for your response. I am having trouble hooking it up. I put the
script in the html and tried:
<asp:textbox id=txtUserName ontextchanged="onchange" runat="server"
Width="100%"></asp:textbox>

I need to connect it with something in the vb code though, don't I?

 

[Eliyahu Goldin]

Sandy,

ontextchanged is a server-side event. You need the client side onchange one.
That is:

<asp:textbox id=txtUserName onchange="onchange();" runat="server"
Width="100%"></asp:textbox>

vb code is on the server side. Your task is a client-side one. In ASP.NET
You need to have clear understanding what belongs to server and what to
client.

Eliyahu