ASP.NET MVC Action is Called Twice

Question

I have a specific controller action that is being called twice, which aside from being weird is causing problems with a singleton portion of my application (not really a problem, it just brought the double call to my attention).

Any idea why a controller action would be executed twice every time?

Answer 1

Not returning false or preventing the default action on the event in a JavaScript click handler on a link that makes the call via AJAX. In this case, it will also take the default action of the link (i.e., a non-AJAX post to the same URL).

Ex.

<%= Html.ActionLink( "action", "controller" ) %>   $(function() {    $('a').on('click', function(e) {       // solve with "e.preventDefault();" here       var href = $(this).attr('href');       $.get(href, function() { ... });       // or solve with "return false;" here to prevent double request    }); }):