adding key board navigation on third party multi select drop down plugin

[Vishnu Bidarakundi]

I  have a multi select drop down , in that loading around 1900  domain list , that  drop  is multi select  and searchable , after the search the if that item  is not available i can add that "item"  to list .

my above requirement  is done in this third  party library 

here is the  link 

https://cuppalabs.github.io/angular2-multiselect-dropdown/#/searchfilterAddNewItem.

only problem  is that   key board navigation  is not there , after the search  i can press the down key  to select the item by  hitting the "Enter" Key . no up and down key events are not working .

How to add key events  to this library ?

Above feature  is not implemented in that library 

this enhancement to this library is pending from last one year below is the link

https://github.com/CuppaLabs/angular2-multiselect-dropdown/issues/130

I have used nz-zorro select  library  in that   keyboard navigation  is there  but it taking  7 to 8 sec to load the drop down , which is very slow .

Please help me to solve either of the issue keyboard navigation or   speed issue nz zorro multi seletct drop down.

This library taking 1 sec to "https://cuppalabs.github.io/angular2-multiselect-dropdown/#/searchfilterAddNewItem."  but  key board navigation is not there .

Please help me struggling to resolve from last 1 week

[Vishnu Bidarakundi]

Resolved by using the other directive ng select with [virtualscrolling] =  true