button control event

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Hi friend.

I have one button control,one image button, one link button and one dropdownlist which has AutoPostBack=true.

When I run page, controls are render as following ways.

<input type="submit" name="Button1" value="Click" id="Button1" />
    <input type="image" name="btnImage" id="btnImage" src="images/addthis.gif" style="border-width:0px;" />
    
    <select name="drp" onchange="javascript:setTimeout('__doPostBack(\'drp\',\'\')', 0)" id="drp">
</select>
    
<a id="lnk" href="javascript:__doPostBack('lnk','')">Link</a>

Now, You can see in above code that dropdownlist and link button are render with __doPostBack function which is handle its event. but button control or image control does not have any function or control to handle event.

So my question is that If I put more than 10 button and image button so how page identify which button is clicked and raised particular event?

Thanks
Imrankhan

Posted 3-May-10 19:50pm

Imran Khan Pathan

Updated 3-May-10 19:59pm

Sandeep Mewara

v3

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Sandeep Mewara · Answer 1 · 2010-05-03T20:19:00

By default, a Button control is a Submit button. A Submit button does not have a command name (specified by the CommandName property) associated with the button and simply posts the Web page back to the server. You can provide an event handler for the Click event to programmatically control the actions performed when the Submit button is clicked.

Please read this for more details: MSDN: Button Class[^]

Husain Ahmad Khalid · Answer 2 · 2010-05-03T21:34:00

Dear,

Although I couldn't understand your purpose, but if you want to know on server which button was clicked on client PC, you can use

<asp:Button ID="btn" Text="ClickMe" OnClientClick="__doPostBack(this.id, null)" runat="server" />

and on the server you can use:

VB

If Request("__EVENTTARGET") = btn.ClientID Then
     'Do Something ...
End If

Thanks

button control event

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