Detecting Browser Autofill

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 this occur in the page load sequence? Is it before or after document.ready?

Secondly how can I use logic to find out if this occurred? Its not that i want to stop this from occurring, just hook into the event. Preferably something like this:

if (autoFilled == true) {

} else {

}

If possible I would love to see a jsfiddle showing your answer.

Possible duplicates

DOM event for browser password autofill?

Browser Autofill and Javascript triggered events

--Both these questions don't really explain what events are triggered, they just continuously recheck the text-box (not good for performance!).

Solution 1:

The problem is autofill is handled differently by different browsers. Some dispatch the change event, some don't. So it is almost impossible to hook onto an event which is triggered when browser autocompletes an input field.

• Change event trigger for different browsers:

  • For username/password fields:

    1. Firefox 4, IE 7, and IE 8 don't dispatch the change event.
    2. Safari 5 and Chrome 9 do dispatch the change event.

  • For other form fields:

    1. IE 7 and IE 8 don't dispatch the change event.
    2. Firefox 4 does dispatch the change change event when users select a value from a list of suggestions and tab out of the field.
    3. Chrome 9 does not dispatch the change event.
    4. Safari 5 does dispatch the change event.

You best options are to either disable autocomplete for a form using autocomplete="off" in your form or poll at regular interval to see if its filled.

For your question on whether it is filled on or before document.ready again it varies from browser to browser and even version to version. For username/password fields only when you select a username password field is filled. So altogether you would have a very messy code if you try to attach to any event.

You can have a good read on this HERE

Solution 2:

Solution for WebKit browsers

From the MDN docs for the :-webkit-autofill CSS pseudo-class:

The :-webkit-autofill CSS pseudo-class matches when an element has its value autofilled by the browser

We can define a void transition css rule on the desired <input> element once it is :-webkit-autofilled. JS will then be able to hook onto the animationstart event.

Credits to the Klarna UI team. See their nice implementation here:

• CSS rules
• JS hook

Solution 3:

This works for me in the latest Firefox, Chrome, and Edge:

$('#email').on('blur input', function() {
    ....
});

Solution 4:

I was reading a lot about this issue and wanted to provide a very quick workaround that helped me.

let style = window.getComputedStyle(document.getElementById('email'))
  if (style && style.backgroundColor !== inputBackgroundNormalState) {
    this.inputAutofilledByBrowser = true
  }

where inputBackgroundNormalState for my template is 'rgb(255, 255, 255)'.

So basically when browsers apply autocomplete they tend to indicate that the input is autofilled by applying a different (annoying) yellow color on the input.

Edit : this works for every browser