Detecting Browser Autofill

Question

How do you tell if a browser has auto filled a text-box? Especially with username & password boxes that autofill around page load.

My first question is when does

Answer 1

Unfortunately the only reliable way i have found to check this cross browser is to poll the input. To make it responsive also listen to events. Chrome has started hiding auto fill values from javascript which needs a hack.

• Poll every half to third of a second ( Does not need to be instant in most cases )
• Trigger the change event using JQuery then do your logic in a function listening to the change event.

• Add a fix for Chrome hidden autofill password values.

  $(document).ready(function () {
      $('#inputID').change(YOURFUNCTIONNAME);
      $('#inputID').keypress(YOURFUNCTIONNAME);
      $('#inputID').keyup(YOURFUNCTIONNAME);
      $('#inputID').blur(YOURFUNCTIONNAME);
      $('#inputID').focusin(YOURFUNCTIONNAME);
      $('#inputID').focusout(YOURFUNCTIONNAME);
      $('#inputID').on('input', YOURFUNCTIONNAME);
      $('#inputID').on('textInput', YOURFUNCTIONNAME);
      $('#inputID').on('reset', YOURFUNCTIONNAME);
  
      window.setInterval(function() {
          var hasValue = $("#inputID").val().length > 0;//Normal
          if(!hasValue){
              hasValue = $("#inputID:-webkit-autofill").length > 0;//Chrome
          }
  
          if (hasValue) {
              $('#inputID').trigger('change');
          }
      }, 333);
  });