In Jquery Function open the new tab and loader in the ajax

Question

In Jquery function i am call ajax request , on sucess i have to open a url in a new tab .when the function starts i have to show loader and the page opens  then hide the loader.

 

by using window.open('url','_blank')  the browser is blocking the popup user should enable popup manually(Not a good one)

 

if i am using 

async: false

 

then popup is opening in a new tab without blocking in browser but loader is not working.

 

Do You have Any Idea?