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POHow do you ensure a webpage waits for an upload to complete?
 

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  1. POHow do you ensure a webpage waits for an upload to complete?
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    <p>I have the following code which is used to upload large files (~6MB) to an ASP .NET MVC2 application. After the file is uploaded it can take 5 minutes to return a response from the controller.</p> <p>During this time, IE9 does not show any sign that processing is not yet completed, i.e. user can select other file and re-post.</p> <p>How do you inform the user that an operation is not completed and disable the submit button until the old file processing is completed?</p> <pre><code>&lt;% using (Html.BeginForm("InvoiceImport", "Grid", FormMethod.Post, new { enctype = "multipart/form-data" })) {%&gt; &lt;input name="uploadFile" type="file" /&gt; &lt;input type="submit" name='invoice' value='Read'/&gt; &lt;%} %&gt; </code></pre> <p>Controller:</p> <pre><code>[AcceptVerbs(HttpVerbs.Post)] [Authorize] ActionResult ImportFromFile(HttpPostedFileBase uploadFile) { Server.ScriptTimeout = 30 * 60; var res = ImportFromFile(uploadFile.InputStream); // takes lot of time TempData["Message"] = uploadFile.FileName + " Readed records " + res; return RedirectToAction("Complete"); } </code></pre> <p><strong>Update</strong></p> <p>I looks like the most important issue is to prevent duplicate submits. I tried code below to prevent duplicate submits but for unknown reason Session["Upload"] is null if submit button is pressed in second time. How to prevent duplicate submits ?</p> <pre><code>View added &lt;% if (TempData["Message"]!=null) { %&gt; setTimeout( function() { showMessage ( '&lt;%= TempData["Message"] as string %&gt;'); }, 300 ); &lt;% } %&gt; Controller ActionResult ImportFromFile(HttpPostedFileBase uploadFile) { if (Session["Upload"] != null) { // todo: why this point is never reached ? TempData["Message"] = Session["Upload"] + " Please wait file is being processed"; return View(); } Session.Add("Upload", uploadFile.FileName); Server.ScriptTimeout = 30 * 60; ImportFromFile(uploadFile.InputStream); TempData["Message"] = uploadFile.FileName + " completed"; Session.Remove("Upload"); return RedirectToAction("Complete"); } </code></pre>
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