Switch case as string

The reason you’re seeing this behavior is that this within the each call is a String object instance, not a string primitive. JavaScript has both. In a switch statement, the comparison with the cases is via ===, and a string instance is not === to a string primitive.

Three ways to fix it:

1. If you change your switch to:

   switch (String(this)) {
   

   …that will turn it back into a primitive, whereupon your switch works.

2. As VisioN points out in the comments below, use the arguments that $.each passes (each string — as a primitive — will be provided as the second argument):

   $.each(typ, function(index, value) {
       switch (value) {
           // ...
       }
   });
   

3. Use any of the alternatives discussed in this other answer (one of which is a nice simple for loop).

Side note: You’re falling prey to The Horror of Implicit Globals by not declaring your typ variable.