calling another function from backbone.js fetch success

Question

I am trying to call another function on success of the fetch in the first function but I keep getting an undefined error. The console.log('success') is working.

In the view:

secondFunction: function() {
  console.log('second function called');
},

someFunction: function() {
  someData.fetch({
    success: function(results) {
      console.log('success');
      this.secondFunction();
    }
  });
 },

When I do it like this it's fine but I need the secondFunction to wait until the success of the first for the data.

secondFunction: function() {
  console.log('second function called');
},

someFunction: function() {
  someData.fetch({
    success: function(results) {
      console.log('success');
    }
  });
  this.secondFunction();
 },

Answer 1

try:

someFunction: function() {
  var self = this;
  someData.fetch({
    success: function(results) {
      console.log('success');
      self.secondFunction();
    }
  });
 },

Note the use of self. Keep in mind you are in the callback function ;-)