Need to display a "Loading" image on Page Load

I guess how you do this depends on how nice you would like it to look (or just do the job).

You could just use response.write() and response.flush() on page load to generate a basic load page, before you start the long processing. You would then need something to hide this when complete.

Another way to achieve this, but make it look a little nicer, is display a full page first with a loading image then do a ajax postback to start the long process running, simply remove the loading image on the ajax postback return. Implementation of this is made simple with UpdatePanels, however if performance is of importance you may want to look at creating the call using javascript (or jquery to make it a little bit easier)

hope that helps

For this we will add two div id in the css file. One is the #content id that will contain all the content of body inside it. Its display will be set to ‘none’.

Add another div id #loading that will show the loading gif image. Keep its z-index to a high value like 1000 or so.

div#content {
    display: none;
    }
 
div#loading {
    top: 200 px;
    margin: auto;
    position: absolute;
    z-index: 1000;
    width: 160px;
    height: 24px;
    background: url(loadingimage.gif) no-repeat;
    cursor: wait;
    }

Now add these div id into your html page as follows-

1
2
<div id="loading"></div>
<div id="content">your html content here......</div>
Now add the following javascript code into head section of your html page.

1
2
3
4
5
6
7
<script type="text/javascript">// <![CDATA[
        function preloader(){
            document.getElementById("loading").style.display = "none";
            document.getElementById("content").style.display = "block";
        }//preloader
        window.onload = preloader;
// ]]></script>

Hope this will give the idea to solve your queries.

Actually saw this article and tried this already. Doesn't seem to work with the masterpages.