how to set a item/option dynamically in angular js

Question

I have a dropdown in my html page and i am using angular js option to get the values from an object. here is my code

 

<select data-ng-mobel"args.employeeid"  data-ng-option="item.employeeid as item.employeename for item in employees">

 

in my typscript file i am checking something and want to select an option from my above dropdownlist dynamically , but not sure how to do it. I am new to angular js.

 

Any help much appreciated.