How to pass a callback as a parameter into another function

Question

I m new to ajax and callback functions  please forgive me if i get the concepts all wrong   Problem  Could i send a callbackfunction as a parameter to another function that will execute the callback   function firstFunction          some code        a callback function is written for   post   to execute     secondFunction  var1   var2  callbackfunction      function secondFunction var1  var2  callbackfunction        params        if  event    null  params   event     amp       form  serialize              post   will execute the callback function       post form action params  callbackfunction

User · Answer

You can use JavaScript CallBak like this:

var a;

function function1(callback) {
 console.log("First comeplete");
 a = "Some value";
 callback();
}
function function2(){
 console.log("Second comeplete:", a);
}


function1(function2);

Or Java Script Promise:

let promise = new Promise(function(resolve, reject) { 
  // do function1 job
  let a = "Your assign value"
  resolve(a);
});

promise.then(             

function(a) {
 // do function2 job with function1 return value;
 console.log("Second comeplete:", a);
},
function(error) { 
 console.log("Error found");
});

User · Answer

Yes of course  function are objects and can be passed   but of course you must declare it   function firstFunction          some code     var callbackfunction   function data            do something with the data returned from the ajax request              a callback function is written for   post   to execute     secondFunction  var1   var2  callbackfunction       an interesting thing is that your callback function has also access to every variable you might have declared inside firstFunction    variables in javascript have local scope

User · Answer

Yup  Function references are just like any other object reference  you can pass them around to your heart s content  Here s a more concrete example   x000D   x000D  function foo         console log  Hello from foo        function caller f           Call the given function     f       function indirectCaller f           Call  caller   who will in turn call  f      caller f         Do it indirectCaller foo      logs  Hello from foo   x000D   x000D   x000D   You can also pass in arguments for foo   x000D   x000D  function foo a  b        console log a           b            a   b       function caller f  v1  v2           Call the given function     f v1  v2      function indirectCaller f  v1  v2           Call  caller   who will in turn call  f      caller f  v1  v2         Do it indirectCaller foo  1  2      logs  1   2   3  x000D   x000D   x000D

User · Answer

Also  could be simple as   if  typeof foo     function        foo

User · Answer

Example for CoffeeScript   test    str  callback  - gt    data    Input values      ajax     type   post      url   http   www mydomain com ajaxscript      data  data     success  callback  test  data  textStatus  xhr  - gt    alert data     t    textStatus

User · Answer

If you google for javascript callback function example you will get Getting a better understanding of callback functions in JavaScript  This is how to do a callback function   function f         alert  f was called        function callFunction func        func       callFunction f

[javascript] How to pass a callback as a parameter into another function

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