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JavaScript AngularJS An Introduction to Two-Way Data Binding Two-Way Binding: watchers

Daniel Hildreth
Daniel Hildreth
16,170 Points
Posted by Daniel Hildreth
Daniel Hildreth
16,170 Points

Two-Way Binding: Watchers AngularJS Challenge Help

So I am having trouble with the last challenge in this Two-Way Binding course in AngularJS. It asks me to "Create a watcher that binds to the property user.id and, if it's set, calls the function getUserData with the new ID." What is wrong with the ode I have?

app.js 
angular.module('myApp', [])
.controller('myController', function ($scope, $http) {
  $scope.user = {name: 'Alex', id: 123};

  getUserData = function (id) {
    console.log('Getting user with ID: ' + id);
  }

  $scope.$watch('user.id', function (newId, oldId) {
    if (newId) {
      api.getUserData($scope.user);
    }
  }
 });
});
index.html 
<!DOCTYPE html>
<html ng-app="myApp">
<head>
  <title>Angular.js</title>
  <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.2/angular.min.js"></script>
  <script src="app.js"></script>
</head>
<body ng-controller="myController">

  <input type="text" ng-model="user.id" />

</body>
</html>

1 Answer

andi mitre
STAFF
andi mitre
Treehouse Guest Teacher
andi mitre
andi mitre
Treehouse Guest Teacher

Hey Daniel, very close..you want to call the getUserData function with the newId and add a semicolon.

angular.module('myApp', [])
.controller('myController', function ($scope, $http) {
  $scope.user = {name: 'Alex', id: 123};

  getUserData = function (id) {
    console.log('Getting user with ID: ' + id);
  }

  $scope.$watch('user.id', function (newId, oldId) {
    if (newId) {
      getUserData(newId);
    };
  });
});

Cheers