ASP.NET (WebForms) has a concept of postbacks. This is not entirely the same a submitting the current form. A LinkButton for example, when clicked, will call a __doPostBack javascript function which was added by ASP.NET. This means that you can’t always subscribe to the ‘submit’ event with jQuery: $(‘form’).on(‘submit’, function() {}); You might want to subscribe to the postback because, just before calling the server, you need to fill some hidden field. At least, that was my case. So, what