Form submitted twice after updating from ASP MVC 3 Preview to Beta

Question

After upgrading my ASP MVC from 3 Preview to 3 Beta I see strange behaviour in my Ajax forms.

@using(Ajax.BeginForm("New", new AjaxOptions() {OnSuccess = "onAjaxSuccess", OnFailure = "onAjaxFailure", OnBegin = "onAjaxBegin", HttpMethod = "Post"})) {}

<form action="/Order/New" data-ajax="true" data-ajax-begin="onAjaxBegin" data-ajax-failure="onAjaxFailure" data-ajax-method="Post" data-ajax-success="onAjaxSuccess" method="post"></form>

I have placed an alert inside my function onAjaxBegin and it is beeing fired twice, each time i click on my submit button.

Anyone else seen this behaviour? I have not changed anything in the code after upgrading, and it worked perfectly before the upgrade.

Answer 1

Look at the generated HTML. In ASP.NET MVC 3 Beta there's new support for unobtrusive jquery based ajax and all the Ajax helpers use jquery now. Maybe there's something left with MS Ajax which causes the double call. Make sure you remove all the inclusions of MSAjax scripts from the page. Also why using Ajax.BeginForm when you could simply use Html.BeginForm with unobtrusive jquery?