Callback function jQuery

Question

Need to run helloWorld() after execution of dragTrack() function. But helloWorld is not being called after dragTrack.

dragTrack(function(){
    helloWorld();
});

function dragTrack() {
    alert('first');
}

function helloWorld() {
    alert('second');
}

You should first research and than ask questions ,,, refer these answers stackoverflow.com/questions/18514504/… — Amar Singh
– Amar Singh, Commented Jan 11, 2016 at 7:04

Arun P Johny · Accepted Answer · 2016-01-11 06:53:48Z

7

You are passing a function as argument, but dragTrack need to be changed to accept the callback and to invoke it

dragTrack(helloWorld);

function dragTrack(callback) {
  alert('first');
  if (callback) {
    callback();
  }
}

function helloWorld() {
  alert('second');
}

answered Jan 11, 2016 at 6:53

Arun P Johny

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Comments

Charly H · Accepted Answer · 2016-01-11 06:58:29Z

0

You are passing helloWorld() as an argument in your dragTrack() call, but you aren't processing it. Your dragTrack function needs a callback Parameter, so you can use your helloWorld() function as an Argument.

answered Jan 11, 2016 at 6:58

Charly H

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