Add handlers to be called when the Deferred object is rejected.

.deferred.catch(failFilter)🡢 Promise

failFilter FunctionA function that is called when the Deferred is rejected.

deferred.catch( fn ) is an alias to deferred.then( null, fn ). Read its page for more information.

Since the jQuery.get method returns a jqXHR object, which is derived from a Deferred object, we can add rejection handlers using the .catch method.

  .then(function () {
    alert("$.get succeeded");
  .catch(function () {
    alert("$.get failed!");

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