Angular.js ng-switch ---testing if value is empty or undefined

Question

In Angular.js templating, I need to test if a value is undefined or empty.... I am not sure how to do this since ng-switch-when tests for expressions in strings. I

Answer 1

ng-switch allows expressions, you can use placeholder, as such:

      
      I am set to zero or undefined?!      
      This string is not empty

For more info: ng-switch on empty string

You usually do it within controller(see answer#1 in linked thread).