Question

Thumbnail image rollover, with image filenames loaded from database at runtime

Asked by: ctl100


I want to implement thumbnail image rollover, as exists in the site www.laurastojanovic.com.
The only difference is that my image filenames are loaded from a database at runtime, they are not static.

I was going to use the .net ImageBox to display the thubnails and the large photo.  I just need the code to handle the mouse-over event.

I'm devloping in: ASP.NET 2008, C#

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Asked On
2009-06-11 at 17:07:34ID24485186
Tags

ASP.NET

Topics

Programming for ASP.NET

,

JavaScript

,

Miscellaneous Web Development

Participating Experts
1
Points
500
Comments
7

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Answers

 

by: prairiedogPosted on 2009-06-12 at 06:46:51ID: 24612202

>>>I was going to use the .net ImageBox

I don't recall there is an ImageBox control in ASP.NET, but there is an ImageBox control in Windows Form. Is this a web application or windows application?

 

by: ctl100Posted on 2009-06-12 at 08:26:02ID: 24613185

This is a web application.

If I am unclear on how I'm explaining the problem maybe I can go into more detail?

 

by: prairiedogPosted on 2009-06-12 at 11:25:37ID: 24614795

So you are trying to use asp:Image control for thumbnails and large pictures, right? You would like to display large pictures when user hover the mouse over the thumbnails?

 

by: ctl100Posted on 2009-06-13 at 11:46:03ID: 24620308

Yup, that would be correct.

 

by: prairiedogPosted on 2009-06-15 at 09:12:51ID: 24630293

This is what you can do:

1. Use a DataList to display thumbnails (Reaper will work too): add an Image control in DataList to store the thumbnail.

2. Use an Image control on top of (or on the right side, wherever you want to) the DataList for displaying the original picture.

3. In DataList's ItemDataBuond event handler, first find the thumbnail Image control, then set the Image control's ImageUrl="TheThumbnailURLFromDB", then pull up the actual image's URL from db, then add "onMouseOver" attribute to the thumbnail Image control as follows:

imgThumbnail.Attributes.Add("onMouseOver", "displayFullImage('ActualImagePathFromDB')")

4. Write a JavaScript function called displayFullImage(url) as follows:


<script type="text/javascript">
function displayFullImage(url)
{
var img = document.getElementById('<%=imgOriginalImage.ClientID %>')
img.style.display="block";
img.style.width="800px"; //change to your image size
img.style.height="600px"; //change to your image size
img.src = url;
}

imgOriginalImage is the Image control added in step 2 above. You can use style="display:none;" to hide it so it will not show up until user hovers the mouse over a thumbnail.

Let me know if you have any further questions,

 

by: prairiedogPosted on 2009-06-25 at 13:24:17ID: 24715642

@ctl100,

Do you still need help on this?

20120131-EE-VQP-002

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