How get the value of Drop down in Typescript?

Question

I have a dropdown list in MVC view as 

 

<select id="organization" class="create-user-select-half"></select>

 

how I can get the value of this in TypeScript?  I tried the javascript like:

 

var organization = document.getElementById("organization");

var strUser = organization.options[e.selectedIndex].value;

 

But  options is not valid.