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mouseover event? need to change image for an ImageButton on mouseover

Posted on 2004-08-20
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Hi experts --

I need to change my ImageUrl to something else (a different image) when the mouse is placed over an ImageButton.  What is a good way to do this?

Thanks in advance,

Dan
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Question by:djhoen
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Expert Comment

by:AerosSaga
ID: 11856985
I believe using a css class is your best solution

Regards,

Aeros
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jnhorst earned 500 total points
ID: 11857454
Dan:

This may point you in the right direction:  I used a couple jpg files from the My Pictures/Sample Picture folder on my XP Pro box.  I put them in an Images folder on my test web application.  You can adjust the script below to follow your desires as for relative paths.  

Add the following within the <HEAD></HEAD> section of the HTML of your aspx page.  

<script language=javascript>
function changeImage(imgCtl, newImgPath)
{
                // this'll work in IE, but probably not well cross browser.
      var ctl = document.getElementById(imgCtl);
      ctl.src = newImgPath;
}
</script>

Then in Page_Load if Page.PostBack == false, add the following: (Image1 is the image control).

this.Image1.Attributes.Add("onmouseover", "javascript:changeImage('" + this.Image1.ID + "', 'Images/Sunset.jpg');");

John


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Expert Comment

by:shovavnik
ID: 11859864
jnhorst's solution is the right way to go.

Just so you understand his solution, keep in mind that asp.net does not throw events for mouse movement.  It would simply generate too many events on the server, and it would be very difficult to actually make use of the data.

Plus, the changing image is a totally client-side, presentation layer type of action.  Avoid sending the data to the server as much as possible.

So really the only reasonable way to do what you want is to make the change on the client, using javascript, as jnhorst demonstrated.
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by:djhoen
ID: 11904065
Thanks a lot guys
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