feat: make datetime-picker usable in forms via implementing ControlValueAccessor

[skriems]

I'm submitting a ...

[ ] Bug report 
[X] Feature request
[ ] Documentation issue or request
[ ] Support request => Please do not submit a support request here, please ask on https://stackoverflow.com/

Bug description / Feature request

datetime-picker.component can't be conveniently used in forms

Minimal reproduction of the problem with instructions

Using a reactive Form I'm not able to bind the component via formControlName. A ValueAccessor is needed

Versions

doesn't apply

Hey Matt,

first of all thanks for this awesome component!! It was fun working with it and exporing Angular 4.
There was just a little problem with your datetime-picker component I came across when using model driven Forms, so this request doesn't really apply to the angular-calendar itself. But as a reference I think your docs can benefit from that.

Since I'm not sure if this is desired here at all and everyone could write his own datetime-picker component which serves ones needs I'm just adding a reference for now to my version which implements ControlValueAccessor. Just let me know if you would like to cover this in your docs/examples. If I find some time I can create a PR then.

Feel free to close this right away since it's not a bug

dateime-picker component implementing ControlValueAccessor

[mattlewis92]

I don't see the harm in promoting best practises in the demo code, would you be so kind as to make a PR to this repo with these changes? Thanks! 😄

I believe this change would also allow the component to be used with ngModel which is a nice benefit as well.

[skriems]

exactly, that's what I'm doing in my code :)
Ok, I'll create a PR with these changes ASAP

[mattlewis92]

Awesome, thanks! 😄