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POAjaxFileUpload: How can I alert the user to a server-side error in OnUploadComplete?
 

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  1. POAjaxFileUpload: How can I alert the user to a server-side error in OnUploadComplete?
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    <p>I've got the <code>AjaxFileUpload</code> control working just fine -- it uploads, and on completion calls the server-side code to move the files around, works just fine, etc etc etc.</p> <p>What I'm worried about are <em>potential</em> server-side errors, and how to hand back some sort of warning to the user. Not an Ajax error, but something on the server-side code.</p> <p>Now, I've got log4net running just fine, and it's called in my error-trapping code and merrily dumping logs when I hard-code an error.</p> <p>But that doesn't tell the users anything.</p> <p><code>RegisterStartupScript</code> doesn't seem to be a valid solution, because there's no PostBack that would allow it to operate (same as my first attempt at populating fields. doh!).</p> <p>Now, I can shove some JS into the <code>ClientUploadComplete</code> or <code>ClientUploadCompleteAll</code> to do a PostBack... but that doesn't seem right, and it would require that server-side error-messages be queued-up for display. Plus, it clears out the <code>AjaxFileUpload</code> display of what has been uploaded.</p> <p>All the error-handling I've seen regarding these controls is for Ajax errors. Is there anything for server-side issues that allows for easy feedback to the user?</p> <p>Am I even barking up the right trees?</p> <hr> <p><strong>UPDATE</strong> Using the pointers @ <a href="https://stackoverflow.com/questions/18743107/getting-asynfileupload-controls-file-name-on-button-click/18761934#18761934">Yuriy's other answer</a> I've got the following working:</p> <p>Onn the server side:</p> <pre><code> protected void OnUploadComplete(object sender, AjaxFileUploadEventArgs e) { try { // does something with the uploaded files that _might_ fail } catch (Exception ex) { var ce = Logger.LogError(ex); var msg = string.Format("{{ 'id': '{0}', 'message': '{1}'}}", ce.ErrorId, ce.Message); e.PostedUrl = msg; } } </code></pre> <p>(The Logger dumps the complete exception into a log4net log, and returns an error-number and consumer-friendly message to contact support)</p> <p>Back on the page, the <code>AjaxFileUpload</code> control is configured to call the JS when complete:</p> <pre><code>&lt;asp:AjaxFileUpload runat="server" ID="Uploader" MaximumNumberOfFiles="10" OnUploadComplete="OnUploadComplete" OnClientUploadComplete="AjaxFileUpload1_OnClientUploadComplete"/&gt; </code></pre> <p>And the javascript:</p> <pre><code>&lt;script type="text/javascript"&gt; function AjaxFileUpload1_OnClientUploadComplete(sender, args) { var errText = args.get_postedUrl(); if (!errText) return; // only process if populated var errinfo = Sys.Serialization.JavaScriptSerializer.deserialize(errText); if (errinfo &amp;&amp; errinfo.id &amp;&amp; errinfo.message) { var idEl = document.getElementById('errnbr'); var msgEl = document.getElementById('errmsg'); if (idEl &amp;&amp; msgEl) { idEl.innerHTML = errinfo.id; msgEl.innerHTML = errinfo.message; } } } &lt;/script&gt; </code></pre> <p>which populates the following:</p> <pre><code>&lt;div class="failureNotification" id="ErrorDisplay" runat="server"&gt; &lt;span id="errnbr"&gt;&lt;asp:Literal ID="ErrorNumber" runat="server"&gt;&lt;/asp:Literal&gt;&lt;/span&gt; &lt;span id="errmsg"&gt;&lt;asp:Literal ID="FailureText" runat="server"&gt;&lt;/asp:Literal&gt;&lt;/span&gt; &lt;/div&gt; </code></pre>
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