Triggering AngularJS form validation with javascript chrome extension

I am struggling to figure out a way to trigger these AngularJS classes on a form I am trying to automatically fill with a chrome extension I am making. The form (specifically a textbox) has to be validated/modified before it will be validated and therefore submitted.

I originally tried using javascript to set the value of the textbox using the value property. This did not validate the form. I then tried using a dispatch event to send a key to the textbox, which resulted in nothing being input into the text box. How can I validate the form without requiring human input, or is this not possible?

Reference https://www.w3schools.com/angular/angular_validation.asp

from Triggering AngularJS form validation with javascript chrome extension