md-chips: Add support for comma separated entry

[Ignigena]

I have a use case for the Chips component in which a user is entering a list of tags in the field. For most of my users it is not very intuitive to hit the enter key after each input. Rather, they enter a comma and expect the field to update accordingly.

While I can create custom handling for this in my controller, it seems to me this is a rather common use case which could use an opt-in setting on the directive. I'd be more than happy to submit a PR for this feature if it's something that makes sense in the framework.

[philippeluickx]

+1

[topherfangio]

Just to confirm, you basically want comma to work identically to the enter key correct?

[Ignigena]

Correct, so entering a comma would append the buffer to the list and create a new chip. @Frank3K suggested in my PR that semi-colons might also be a good use case for contact chips when typing an e-mail address. I have since modified the original PR to include a more generic approach (although understandable if this approach is not ideal.)

[tanansatpal]

The issue is closed for the desktop browser, but in case of mobile devices it is not working

[topherfangio]

@satpaltanan If you're having an issue on mobile, can you please open a new issue with a relevant Codepen and ping me on it? Thanks!

[tanansatpal]

Please check the codepen link
http://codepen.io/bsrinivasguptha/pen/YwamLm/
It has custom separator keys as Enter and Comma, but only Enter is working in the mobile device, Comma is not working.