Setting the default button for a textbox in ASP. NET

Hitting the Enter key in a textbox can sometimes have undesired effects like the wrong submit button being "clicked". the method described below allows you to specify a default button to submit when the user hits the Enter key in a textbox.

When you press a key on your keyboard, the JS onkeypress event is fired. this calla function to which we pass the ID of the button associated with the textbox. the function gets a reference to the button and simuilates a mouse-click on the button. we perform a browser detection because IE and Netscape have different event models. the function finally returns false so that the keypress event is canceled (otherwise a second form submit will be raised ). this works with newer versions of IE/Netscape.

Function clickbutton (E, buttonid ){

VaR EVT = e? E: window. event;

VaR bt = Document. getelementbyid (buttonid );

If (BT ){

If (EVT. keycode = 13 ){

Bt. Click ();

Return false;

}

}

}

// Code behind
Textbox1.attributes. Add ("onkeypress", "Return clickbutton (event, '" + button1.clientid + "')");

The code behind generates the following code:

<Input name = "textbox1" type = "text" id = "textbox1" onkeypress = "Return clickbutton (event, 'button1')"/>

This causes web control button1 to be clicked when the Enter key is hit inside textbox1.