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POFireFox and IE9 tries to download or show json-response instead of letting javascript parse it
 

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  1. POFireFox and IE9 tries to download or show json-response instead of letting javascript parse it
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    <p><strong>Update</strong></p> <p>My problem was that I used event.preventDefault() instead of return false to hinder the form from posting normally. FF and IE didn't like that and broke the JS by that line. I removed that and appended return false at the end and this solved the problem. Thanks to Darin Dimitrov for the extensive checklist.</p> <p><strong>Original question</strong></p> <p>I'm using ASP.NET MVC3 and jquery ajax to post json-data to the server and receive a response. However, when I'm using Chrome it reads the json-response normally, updating the divs that I want etc. With IE and FF it doesn't work though. They read just the response and shows only that on the page.</p> <p>I saw some other threads mentioning to define the mime type as "text/plain". This changed the previous behavior of prompting the user to download the json-response instead. </p> <p>This is the javascript for making the post:</p> <pre><code> $.ajax({ url: $("#formRegister").attr("action"), type: 'POST', data: JSON.stringify(user), dataType: 'json', contentType: 'application/json, charset=utf-8', traditional: true, success: function (data) { alertMessage(data.Message); }, error: function () { } }); </code></pre> <p>This is the ActionMethod receiving the call and returning a JsonResponse:</p> <pre><code>[HttpPost] public JsonResult Register(UserRegisterPackage package) { ClientAlert alert = new ClientAlert(); if (package.Password != null) { //bool success = Removed for simplicity's sake. bool success = true; if (success) { alert.Message = "Success!"; } else { alert.Message = "Failed to register"; } } else { alert.Message = "You need to enter a password!"; } return Json(alert, "text/plain"); } </code></pre> <p>As I said, when the content type is defined as text/plain the browser shows only the response and when it's not defined it prompts the user to download the json-response instead.</p> <p>With FF I seem to get an error about: </p> <pre><code>"event is not defined event.preventDefault(); " </code></pre> <p>This could have something to do with the error.. but I need to prevent the form from posting normally. Is this done differently in FF or IE?</p> <p>Any ideas?</p>
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    1. COHave you tried defining a different content-type, such as 'text/json'?
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    2. COGives same result as not defining the content-type; browser tries to download the response.
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