On Change Extension
Submit On Change
The form submit event is triggered when a value is selected for a Radio or Select option.
You can find this configuration on Form > Content > Form Fields > Your Field > e-addons Tab.
If the field is in a Steps Form and not in the last step then it will trigger the Next button click.
Hide current Buttons
Hide the next Action Buttons present in the step/form, like the Submit/Previous/Next buttons.
Adding a small delay (in milliseconds) let User see the selected option before move him to next Step