How to get GotFocus, LostFocus event of a textbox

问题:

I am not able to get the event GotFocus, LostFocus of a textbox while creating a website. I just wanted. As I have asked earlier in my question how to get the value of one textbox into another textbox when focus is text to the other textbox in winforms. I was able to work it done in windows form. But, when I try the same in a website, I am not able to get these events their.....Should Java script be used to get these events? Pelase help

回答1:

GotFocus, LostFocus events for TextBox are in Windows Control but for WebControls, You will not get these, Instead of you should try clientside scripting (Javascript).

In javascript you will get the event focus and blur for a textbox (which is actually a input type="text" on web page) , and you can use these for your purpose.

For setting an event handler, use on + event as event handler and provide the js code which to execute.

like for blur event you should add attribute onblur and for focus add attribute onfocus

In Javascript you can try, if your aspx has TextBox as

<asp:TextBox runat="server" id="textbox1" onblur="SetTextInTextBox2()" />
<asp:TextBox runat="server" id="textbox2" onfocus="SetTextInTextBox2()" />

in javascript

function SetTextInTextBox2()
{
    document.getElementById('textbox2').value = document.getElementById('textbox1').value;
}

回答2:

try TextBox1.Focus() for getting the focus on textbox and for lost focus, take focus from this textbox1 to another or some hidden control.