JavaScript What does callback stand for? what does callback mean,what does callback mean in theatre,

I'm new to JS. I'm studying the following code and I'm wondering what the word callback stands for, what does it?

function(fileID, callback) {
  var request = $.ajax({
    url: url + "wishlist/" + fileID,
    type: "GET"
  });

  request.done(callback);

  request.fail(function (jqXHR, textStatus) {

  }); 
}
Answer:1

It doesn't stand for anything, it is not an abbreviation.

In general terms, a callback is a piece of code which is passed to a function to be executed at a later time.

In JavaScript, that "piece of code" is almost always a function.

The simplest example of such is setTimeout where the first argument is the code (which should be a function but may be a string to be evalulated) and the second argument is the number of milliseconds from now that the "later time" occurs at.

function aFunction () { alert("Ta da"); }
setTimeout( aFunction /* The callback function */,
            500 /* 500ms from now */ 
          );

In the example you give in the question, the "later time" is "When the response to the HTTP request has been received". Another example might be "When the user clicks on a link":

document.querySelector('a').addEventListener('click', aFunction);

See also: the Wikipedia entry on callbacks.

Answer:2

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