Detect When a Control Gains Focus

[StinkyDuck]

Is there a way to detect when a control gains focus on a webform? Say I
have two text boxes. After the user types in information on the first text
box and hits the tab key or clicks on the second text box, I want to
automatically fill in the second text box with the information from the
first text box.

I just can't seem to find an event handler for when the control gains/loses
focus.

-StinkyDuck

 

[Guest]

StinkyDuck,
"focus" is a client-side, in - the - browser event that can be handled with
Javascript. Usually the event name is onfocus. if you are looking to fill in
a second textbox when the user leaves the first, onblur would probably be
more useful.

--Peter
"Inside every large program, there is a small program trying to get out."
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[Eliyahu Goldin]

You can do it on client side with javascript. Handle onfocus event:

myTextBox2.Attributes["onfocus"] = "myHandler()"

and myHandler will be a javascript function with something like
Form1.myTextBox2.value = Form1.myTextBox1.value;

You may have to refer to the textboxes in some other way depending on where
they are located.

 

[Scott Roberts]

As others have mentioned, JavaScript (onblur/onfocus) is the preferred way.

However, you could set AutoPostBack=true and create a OnChange handler to do
what you want on the server. This approach is riddled with problems and not
recommended, but it is available nonetheless.