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copied!<p><strong>See Simons answer below. The method I describe here is no longer needed in the latest version of ASP.NET MVC.</strong></p> <p>The way the <code>IsMvcAjaxRequest</code> extension method currently works is that it checks <code>Request["__MVCASYNCPOST"] == "true"</code>, and it only works when the method is a HTTP POST request.</p> <p>If you are making HTTP POST requests throug jQuery you could dynamically insert the <code>__MVCASYNCPOST</code> value into your request and then you could take advantage of the <code>IsMvcAjaxRequest</code> extension method.</p> <p>Here is a <a href="http://www.codeplex.com/aspnet/SourceControl/FileView.aspx?itemId=266442&changeSetId=17272" rel="nofollow noreferrer">link to the source of the IsMvcAjaxRequest extension method</a> for your convenience.</p> <p>Alternatively, you could create a clone of the <code>IsMvcAjaxRequest</code> extension method called <code>IsjQueryAjaxRequest</code> that checks <code>Request["__JQUERYASYNCPOST"] == "true"</code> and you could dynamically insert that value into the HTTP POST.</p> <p><strong>Update</strong></p> <p>I decided to go ahead and give this a shot here is what I came up with.</p> <p>Extension Method</p> <pre><code>public static class HttpRequestBaseExtensions { public static bool IsjQueryAjaxRequest(this HttpRequestBase request) { if (request == null) throw new ArgumentNullException("request"); return request["__JQUERYASYNCPOST"] == "true"; } } </code></pre> <p>Checking from an action if a method is a jQuery $.ajax() request:</p> <pre><code>if (Request.IsjQueryAjaxRequest()) //some code here </code></pre> <p>JavaScript</p> <pre><code>$('form input[type=submit]').click(function(evt) { //intercept submit button and use AJAX instead evt.preventDefault(); $.ajax( { type: "POST", url: "<%= Url.Action("Create") %>", dataType: "json", data: { "__JQUERYASYNCPOST": "true" }, success: function(data) {alert(':)');}, error: function(res, textStatus, errorThrown) {alert(':(');} } ); }); </code></pre>

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