In this example, I created a simple form with one input called “username.” I’ve added “onchange=’needToConfirm=True'” to monitor the input field. I also added a save and cancel button, as well as an internal link for testing the form later. The save button calls the “needToConfirm” function when the save button is clicked. The cancel button simply reloads the same page when the cancel button is clicked. Here’s the HTML markup.