How Can We Reliably Detect Browser Autofill Events?

Detecting Browser Autofill

When browser autofill completes a text box, various browsers behave differently. Some trigger change events, while others do not. This inconsistency makes it challenging to identify autofill events reliably.

Event Triggers

The following table outlines the change event behavior for different browsers:

Browser	Username/Password Fields	Other Form Fields
Firefox 4	No change event	Change event triggered when value selected from suggestions
IE 7, IE 8	No change event	No change event
Safari 5	Change event	Change event
Chrome 9	Change event	No change event

Detection Methods

To detect browser autofill, consider the following approaches:

• Disable Autocomplete: Use autocomplete="off" on the form elements to prevent browsers from autocompleting.
• Polling: Regularly check if the text box is filled. However, this can introduce performance issues.

Browser Considerations

The timing of autofill completion varies across browsers. For username/password fields, it often occurs after the page loads. For other form fields, it may occur during different stages of user interaction.

Conclusion

While detecting browser autofill can be challenging, understanding the varying behavior of different browsers can help developers tailor their solutions accordingly. By considering the event triggers and detection methods outlined above, it is possible to implement effective solutions that handle autofill scenarios.

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