chrome extension popup cannot find element by ID

Question

I know similar questions have been asked many times, but I didn\'t find a solution for mine yet. My question is really simple. All I want to do is to test actions on popup.html,

Answer 1

I believe your popup.js syntax is wrong

  $('#btn').click(function (){
   alert("test"); 
};

should be

    $('#btn').click(function (){
   alert("test");
   });

looks like you are missing a paran;