how to disable submit button with jquery

Question

I have a simple form to check the value of post code entered by the user against a variable,

I\'m trying to disable the submit button and do the check and give alert

Answer 1

The W3C recommends to set that attribute to disabled="disabled", so:

$('#submit_postcode').attr('disabled', 'disabled');

Re-enabling can be done by removing the attribute:

$('#submit_postcode').removeAttr('disabled');

Setting the attribute to any value causes it to be disabled, even .attr('disabled', 'false'), so it has to be removed.