Have a custom extension honor readonly status

Summary

How do I make the numeric keypad honor readonly of the input attribute?

Content

Hello, I am trying to use the "Example: Display a numeric keypad" from the OIA documentation for number inputs in mobile browsers. It is working successfully. However, some numeric input attributes are set to readonly under certain circumstances. The numeric keypad extension does not honor the readonly status of the underlying input attribute. How do I get the extension to honor the readonly status of the attribute?

I added the following code to the java script, but it doesn't have any effect.

if (control.isReadOnly() ) {