How can I prevent a double submit with jQuery or Javascript?

Question

I keep getting duplicate entries in my database because of impatient users clicking the submit button multiple times.

I googled and googled and found a few scripts,

Answer 1

Here is bit of jQuery that I use to avoid the double click problem. It will only allow one click of the submit button.

$(document).ready(function() {
  $("#submit").on('click', function() {
  });
});