Strange HTML button postback

[Guest]

I have a webform with lots of <asp:...controls but I need couple of buttons
that doesn't cause an automatic postback. I use javascript to handle these
buttons. I tried two approaches with different results:

<IMG onmouseup="src='Bitmaps/Controls/measure_over.bmp';"
onmousedown="src='Bitmaps/Controls/measure_pressed.bmp';"
id="measure" onmouseover="src='Bitmaps/Controls/measure_over.bmp';"
style="LEFT: 170px; WIDTH: 24px; POSITION: absolute; TOP: 2px; HEIGHT: 25px"
onclick="buttonClicked(this.id);"
onmouseout="src='Bitmaps/Controls/measure_btn.bmp';"
alt="" src="Bitmaps/Controls/measure_btn.bmp">

This is working the way I want to, but I can't disable it as I can with a
button. I then replace the IMG with:

INPUT Type="image"

and it makes a postback every time I click on it. Why? A HTML control
should't do that, right? The script itself (buttonClicked) just fills a
hidden field.

/Miro

 

[Jason Kendall]

From the MSDN Library about the <input typ="image" tag:

--------------------------------------------------------------------------------
INPUT type=image Element | input type=image Object
Creates an image control that, when clicked, causes the form to be
immediately submitted.
--------------------------------------------------------------------------------


Maybe add "onclick='return false;'" to the tag.

-Jason Kendall
(e-mail address removed)