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enabling submit button if text entered

/ Published in: jQuery
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Copy this code and paste it in your HTML 
  1. $('#username').keyup(function() {
  2.     $('#submit').attr('disabled', !$('#username').val()); 
  3. });

URL: http://cakebaker.42dh.com/2009/01/13/enabling-submit-button-if-text-entered/

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