jQuery disable/enable submit button

Question

I have this HTML:

How can I do something li

Answer 1

I had to work a bit to make this fit my use case.

I have a form where all fields must have a value before submitting.

Here's what I did:

  $(document).ready(function() {
       $('#form_id button[type="submit"]').prop('disabled', true);

       $('#form_id input, #form_id select').keyup(function() {
          var disable = false;

          $('#form_id input, #form_id select').each(function() {
            if($(this).val() == '') { disable = true };
          });

          $('#form_id button[type="submit"]').prop('disabled', disable);
       });
  });

Thanks to everyone for their answers here.