feat(focusable): allow control to be get focus. Support for tab navigati...

[dimirc]

Changes:

• Accesible for tab-key navigation
• Can start typing even when the dropdown isn't open, just with focus
• Can open dropdown with enter, up-down-left-right keys when focus
• Isn't focusable when the control is disabled

Working plunker

Resolves #51

[dimirc]

Travis is falling but doesn't seem related to this PR since same failing tests appear from current master branch. Maybe we should merge first #91 since tests are passing this those changes

[mattiash]

I have tested the plunker and it is possible to use the keyboard to update the field. However, when I want to use a normal select I use Tab to focus the select and then I press Space to open the dropdown. In the plunker, Space does not open the dropdown.

Shouldn't Space open the dropdown since it does so in a normal select? One way of handling it would be to strip leading and terminating whitespace in the search criteria, meaning that if the search field contains only whitespace, it matches everything and thus all entries are displayed.

[dimirc]

@mattiash we'll be able to do that now, I just pushed a new commit with this change. You can check plunker again

[mattiash]

@dimirc Great! I have tested the updated plunker and Space opens the dropdown now. Thank you!