UI Mask phone element
This is an attempt at getting a phone element to have a ui mask in polymer. Similar to ui-mask from angular here: https://github.com/angular-ui/ui-mask.
All the magic is pretty much in the MaskBehavior which the ui-phone element uses.
The masking is done by the excellent string-mask library at: https://unpkg.com/string-mask@0.3.0/src/string-mask.js and https://github.com/the-darc/string-mask. Nice job, https://github.com/the-darc.
As a bonus, this element also plays nicely with angular using the angular_bind_polymer.js directive at https://github.com/eee-c/angular-bind-polymer.
You can mask 2 ways: preformat or normal masking as you type. So the real masking occurs if you preformat, in which case you will get the format with underscores as placeholders for what you type.
This is still in early development, and bugs or PRs are welcome. (And also if anyone can point me to a better implementation, because writing a ui-mask sucks.)
First, make sure you have the Polymer CLI installed. Then run polymer serve to serve your element locally.
$ polymer serve
$ polymer test
Your application is already set up to be tested via web-component-tester. Run polymer test to run your application's test suite locally.