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POImage is not appearing when Showing a Div with loading image during Postbacks ASP.net
 

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  1. POImage is not appearing when Showing a Div with loading image during Postbacks ASP.net
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    <p>I am intending to show a Div with loading image during page post-backs to inform the user about a runing operation. I am using a simple javascript function that shows the div, when I call this JavaScript from an html input button (without postback), the div is appearing normally. But when I use it with a post-back button, (by setting its OnClientClick property), the div is appearing, but without the image unloaded (showing as a box with unloaded image). I am not able to figure where the problem is, I even tried adding the image as a hidden html control so that it is preloaded before the post-back, but with no prevail. Here is my aspx code:</p> <pre><code>&lt;html xmlns="http://www.w3.org/1999/xhtml"&gt; &lt;head runat="server"&gt; &lt;title&gt;&lt;/title&gt; &lt;script type="text/javascript" language="javascript"&gt; function PleaseWait(message) { message = message ? message : PleaseWaitDefaultMessage; var dsoctop = document.all ? window.document.body.scrollTop : window.pageYOffset; var el = document.getElementById("PleaseWaitDiv"); el.style.top = (dsoctop + 100) + "px"; el.style.left = "0px"; el.innerHTML = "&lt;div style='background-color:white;border: solid 0px black; width:100%;'&gt;&lt;img src='" + WebSiteBaseURL + "Images/bigrotation2.gif' /&gt;&lt;h3&gt;" + message + "&lt;/h3&gt;&lt;/div&gt;"; el.style.display = ""; } &lt;/script&gt; &lt;asp:Literal ID="InitLiteral" runat="server" EnableViewState="false"&gt;&lt;script&gt;var PleaseWaitDefaultMessage = "{0}"; var WebSiteBaseURL = "{1}"; &lt;/script&gt; &lt;/asp:Literal&gt; &lt;/head&gt; &lt;body&gt; &lt;form id="form1" runat="server"&gt; &lt;div&gt; &lt;div id="PleaseWaitDiv" style="width: 100%; position: absolute; top: 0px; display: none; text-align: center; z-index: 2; max-width: 1024px; min-width: 600px; height: 260px; overflow: hidden; background: #fff; margin: 0 auto; left: 0; right: 0;"&gt; &lt;/div&gt; &lt;asp:Button ID="btnTestPleaseWait" runat="server" OnClientClick="PleaseWait();" Text="Test Please wait with postback" onclick="btnTestPleaseWait_Click" /&gt; &lt;input type="button" onclick="PleaseWait();" value="Test Please wait no postback" /&gt; &lt;/div&gt; &lt;/form&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>and here is my code behind:</p> <pre><code> protected void Page_Load(object sender, EventArgs e) { InitLiteral.Text = string.Format(InitLiteral.Text, "Please Wait.....", Page.ResolveClientUrl("~/")); } protected void btnTestPleaseWait_Click(object sender, EventArgs e) { System.Threading.Thread.Sleep(5000); } </code></pre>
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    1. USHassan Mokdad
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      1. POImage is not appearing when Showing a Div with loading image during Postbacks ASP.net
      1. USDorababu Meka
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    1. COI think you are not pasing message to the function `onclick="PleaseWait(Process is going on);"`
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      1. POImage is not appearing when Showing a Div with loading image during Postbacks ASP.net
      1. USDorababu Meka
    2. CO@Dotnet, thanks but if i didn't pass a message to the function it will take the default message: message = message ? message : PleaseWaitDefaultMessage;
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      1. POImage is not appearing when Showing a Div with loading image during Postbacks ASP.net
      1. USHassan Mokdad
    3. COI copied your code exactly except I hard-coded an image url. It works. Run Fiddler or some network trace, I think you might be getting a 404 on the image. What if you put the Page_Load code within if(!IsPostback)?
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      1. POImage is not appearing when Showing a Div with loading image during Postbacks ASP.net
      1. USCrowcoder
 

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