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POIs there a way to maintain IsAjaxRequest() across RedirectToAction?
 

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  1. POIs there a way to maintain IsAjaxRequest() across RedirectToAction?
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    <p>If you don't want any context or an example of why I need this, then skip to <b>The question(s)</b> at the bottom!</p> <p>In a bid to keep things tidy I initially built my application without JavaScript. I am now attempting to add a layer of unobtrusive JavaScript on the top of it.</p> <p>In the spirit of MVC I took advantage of the easy routing and re-routing you can do with things like <code>RedirectToAction()</code>.</p> <p>Suppose I have the following URL to kick off the sign up process:</p> <blockquote> <p><a href="http://www.mysite.com/signup" rel="nofollow noreferrer">http://www.mysite.com/signup</a></p> </blockquote> <p>And suppose the sign up process is two steps long:</p> <blockquote> <p><a href="http://www.mysite.com/signup/1" rel="nofollow noreferrer">http://www.mysite.com/signup/1</a><br/> <a href="http://www.mysite.com/signup/2" rel="nofollow noreferrer">http://www.mysite.com/signup/2</a><br/></p> </blockquote> <p>And suppose I want, if JavaScript is enabled, the sign up form to appear in a dialog box like ThickBox.</p> <p>If the user leaves the sign up process at step 2, but later clicks the "sign up" button, I want this URL:</p> <blockquote> <p><a href="http://www.mysite.com/signup" rel="nofollow noreferrer">http://www.mysite.com/signup</a></p> </blockquote> <p>To perform some business logic, checking the session. If they left a previous sign up effort half way through then I want to prompt them to resume that or start over.</p> <p>I might end up with the following methods:</p> <pre><code>public ActionResult SignUp(int? step) { if(!step.HasValue) { if((bool)Session["SignUpInProgress"] == true) { return RedirectToAction("WouldYouLikeToResume"); } else { step = 1; } } ... } public ActionResult WouldYouLikeToResume() { if(Request.IsAjaxRequest()) { return View("WouldYouLikeToResumeControl"); } return View(); } </code></pre> <p>The logic in <b>WouldYouLikeToResume</b> being:</p> <ul> <li>If it's an AJAX request, only return the user control, or "partial", so that the modal popup box does not contain the master page.</li> <li>Otherwise return the normal view</li> </ul> <p>This fails, however, because once I redirect out of SignUp, <code>IsAjaxRequest()</code> becomes false.</p> <p>Obviously there are very easy ways to fix this particular redirect, but I'd like to maintain the knowledge of the Ajax request globally to resolve this issue across my site.</p> <p><b>The question(s):</b></p> <p>ASP.NET MVC is very, very extensible.</p> <p>Is it possible to intercept calls to <code>RedirectToAction</code> and inject something like "isAjaxRequest" in the parameters?</p> <p>OR</p> <p>Is there some other way I can detect, safely, that the originating call was an AJAX one?</p> <p>OR</p> <p>Am I going about this the completely wrong way?</p>
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    1. USRichard Everett
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