How to pass a callback as a parameter into another function

user_813784 0
Viewed 137187

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 + '&' + $(form).serialize();

    // $.post() will execute the callback function
    $.post(form.action,params, callbackfunction);
}
call callback ajax javascript
6 Answers

Example for CoffeeScript:

test = (str, callback) ->
  data = "Input values"
  $.ajax
    type: "post"
    url: "http://www.mydomain.com/ajaxscript"
    data: data
    success: callback

test (data, textStatus, xhr) ->
  alert data + "\t" + textStatus
user_4185180

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_84036890
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