Question

When $.post succeeds, there is a success handler for it. What happens if it fails? Is there a similar handler that we can use for this case, so that we can inform the user that something is not happening right?

Answer 1

There is not, according to the documentation, a specific error handler for $.post method.

What you have to do, if you want to have both the success and fail handlers, is to use the low-level $.ajax method. It’s documentation can be found here: http://api.jquery.com/jQuery.ajax/

$.ajax({
  type: "POST",
  url: "some.php",
  success: function(html){
    /* Do success stuff here */
  },
  error: function(){
    /* do error stuff here */
  }
});