How to prevent a double-click using jQuery?

jQuery’s one() will fire the attached event handler once for each element bound, and then remove the event handler.

If for some reason that doesn’t fulfill the requirements, one could also disable the button entirely after it has been clicked.

$(document).ready(function () {
     $("#submit").one('click', function (event) {  
           event.preventDefault();
           //do something
           $(this).prop('disabled', true);
     });
});

It should be noted that using the ID submit can cause issues, as it overwrites the form.submit function with a reference to that element.