Question

I wonder how can I code this:

//if there is any ajax request
   $("#loader").css("display","block");
//on success:
    $("#loader").css("display","none");

Note :
I am not going to code it again and again in my each ajax request function.
I want it generic so that my script knows if there is any ajax request do $("#loader").css("display","block"); and if there is any ajax success do $("#loader").css("display","none");.

Answer 1

The magical thing you are looking for is jQuery.ajaxStart() and jQuery.ajaxStop(). You might also find jQuery.ajaxComplete() useful.

Example:

$("#loader").ajaxStart(function() {
   $(this).show();
}).ajaxStop(function() {
   $(this).hide();
});

You should use the hide() and show() methods instead of changing the display CSS attribute.