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');
}

• Frebin Francis: dragTrack accepts no parameters ?
• Amar Singh: You should first research and than ask questions ,,, refer these answers stackoverflow.com/questions/18514504/…

Answer 1

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');
}

Answer 2

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.