Static position datepicker

[Halomaple]

What problem does this feature solve?

Current the popup datepicker works very well but user some time needs a already open datepicker to quickly select a date. It can be achieved by using nzOpen=true but the position of opened datepicker is absolute and it is placed under the 'cdk-overlay-connected-position-bounding-box' which cover the whole view portal.

So the tricky thing is: when the layout or offset of the 'fake' container where the orginal is placed in is changed, the datepicker will overflow cause the left or top of its absolute position is not changed.

If ng-zorro-antd can provide static opened datepicker, that would be much nicer. Static and opened datepicker is helpful for date selection.

Thanks.

What does the proposed API look like?

Add a new nzStatic of type boolean default to false. When it is true, use position: static for the datepicker and place it under the original container (where the <nz-date-picker></nz-date-picker> is locating at).

[wilsoncook]

@Halomaple Would match your requirements?

[krokofant]

@wilsoncook What do you mean?

[Halomaple]

@wilsoncook I think the datepicker should offer a option to use position:static so that it will stay inside the container.

[theadley]

This could also lead to another useful API entry for nzInline which could hide the input field and instead show an inline, open date/month/range/week picker.

Edit (20/04/2020): Or you can use the calendar component in a card - really useful and easily missed (sorry about that).

[wzhudev]

I belive that this feature is already implemented in a previous PR #6436.