How to chain .then functions and callback success function in Angular.js

Question

I\'m trying to chain nested .then functions and call the success functions, but call back is calling in the starting itself.

//public method fn
function fn(c         


        

Answer 1

You need to return the promises you create in order to chain them properly. Keep in mind when you use .then() you aren't modifying a promise, you're constructing a new one in the chain.

Your code with promises returned (formatting mine):

function fn(callback) {
  return fn1()
    .then(function(response) {
      return call1(response);
    }, function(error) {
      return $q.reject({
      responseStatus: error.status
    });

    })
    // Return response
    .then(function(response) {
      callback({
        responseStatus: 200
      });
    }, function(error) {
      callback({
        responseStatus: 500
      });
    });
}

function call1(response) {
  return fn2()
    .then(function(response) {
        return call2(response);
      }, function(error) {
        return $q.reject({
        responseStatus: error.status
      });
    });
}


function call2(response) {
  return fn3()
    .then(function(response) {
        return lastfunction();
      //here i need to callback the success  response status
      }, function(error) {
        return $q.reject({
        responseStatus: error.status
      });
    });
}


function fn1(){
 //some code 
 }
function fn2(){
//some code 
}
function fn3(){
//some code 
}