Let the button open a new window

Question

I want to add a button under the tab of my add-in, and clicking on the button should open a URL in a new window or Dialog box. I tried the follows:

Answer 1

after googling about office dev , I found that you can change the action tag to something like

              
                doSomethingAndShowDialog
              

check the following link it might be helpful

https://github.com/OfficeDev/Office-Add-in-Dialog-API-Simple-Example