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POASP.NET AJAX - ScriptManagerProxy and handling html button clicks
 

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  1. POASP.NET AJAX - ScriptManagerProxy and handling html button clicks
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    <p>I am trying to figure out how to accomplish the following:</p> <ul> <li>Handle client-side click event of button - prevent postback if result of javascript call is false (e.g. <code>onclick="js:return IsThisAllowed()"</code>)</li> <li>Javascript method will return true or false, depending on result of call to generated web service method using ScriptManagerProxy</li> </ul> <p>The code below is simplified down to the main components that I am referring to in this question. I can alert() the return value no problem, but the part I'm having trouble with is how I can return the result of the web service method call back to the button onclick handler? Since the function Finish() is called in a separate thread upon success of what I assume is the XmlHttp.send() call, how can I send the value of the response as the return value of the javascript method? Am I going about this all wrong?</p> <p>I've used similar code many times before to update the DOM with the return values, such as within a <code>&lt;div&gt;</code>, but never had to worry about capturing the return value and using it within my script.</p> <p>What I have so far:</p> <p>.NET web service method (VB.NET):</p> <pre><code>&lt;WebMethod()&gt; _ &lt;ScriptMethod()&gt; _ Public Function IsAllowed() As Boolean Return True End Function </code></pre> <p>.NET code for the page to generate AJAX web service methods, and html button</p> <pre><code>&lt;asp:ScriptManagerProxy ID="ScriptManagerProxy1" runat="server"&gt; &lt;Services&gt; &lt;asp:ServiceReference Path="~/WebServices/MyWebService.asmx" /&gt; &lt;/Services&gt; &lt;/asp:ScriptManagerProxy&gt; &lt;asp:Button ID="_btn" runat="server" OnClientClick="js:return IsAllowed();" /&gt; </code></pre> <p>Javascript</p> <pre><code>&lt;script type="text/javascript"&gt; function IsAllowed(orderid) { if (!processing) { processing = true; var ws = new MyWebService(); ws.IsAllowed(Finish, Error) // return TRUE if call to IsAllowed returns true!!! return false; } } function Finish(result) { alert(result) } function Error() { } &lt;/script&gt; </code></pre>
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