Run two functions with Ajax calls sequentially

Question

I have two functions which has ajax calls inside them.

function a(){
    ajaxCall_A();
}
function b(){
    ajaxCall_B();
}

And I

Answer 1

Allow a function to accept a callback param to be executed when done, and send b function as a callback:

function c(){
  a(b); 
}

function a(callback){ 
  $.ajax({
    url: "url_a",
    type: "post",
    dataType: "html",               
    cache: false,
    success: function(data){             
      callback() // Note here call the next function
    },
    error:function(){             

    }   
  });   
}