AngularJS $injector.unpr Error: Understanding and Resolving Common Dependency Injection

As a beginner in AngularJS JavaScript, I have recently started learning and practicing with some small sample programs. However, when attempting this particular code snippet, I encountered an error that I need help resolving.

<body ng-app="myApp">

  <div ng-controller="myCtrl"> 
    {{time}}
    <br>
  </div>
</body>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<script type="text/javascript">
  var app = angular.module("myApp", []);

  app.service('hexafy', ['',
    function() {
      this.myfunc = function(num) {
        return num.toString(16);
      }
    }
  ]);

  app.controller('myCtrl', ['hexafy', '$scope', '$interval',
    function(hexafy, $scope, $interval) {
      $scope.time = new Date().toLocaleTimeString();
      $interval(function() {
        $scope.time = new Date().toLocaleTimeString();
      }, 1000);
      // $scope.hex = hexafy.myfunc(255);
    }
  ]);
</script>

Answer №1

When the code is minified and needs to keep track of arguments, the array syntax is used. For more information on this topic, please refer to my response in Why we Inject our dependencies two times in angularjs?.

In this specific code example, since no parameters are being passed to the hexafy service, there is no need for the array syntax; simply pass an empty string.

app.service('hexafy', ['',
    function() {

It is recommended to use the normal syntax instead.

app.service('hexafy', function() { // <-- Remove `[` and empty string from here
    ...
    ...
}); // <-- Remove `]` from here

var app = angular.module("myApp", []);

app.service('hexafy', function() {
  this.myfunc = function(num) {
    return num.toString(16);
  }
});

app.controller('myCtrl', ['hexafy', '$scope', '$interval',
  function(hexafy, $scope, $interval) {
    $scope.time = new Date().toLocaleTimeString();
    $interval(function() {
      $scope.time = new Date().toLocaleTimeString();
    }, 1000);
  }
]);
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.22/angular.min.js"></script>

<body ng-app="myApp">
  <div ng-controller="myCtrl">
    {{ time }}
    <br />
  </div>
</body>

Answer №2

Tushar's recommendation is spot on. Just include a functional example from Plunker

app.service('hexafy',function() {
  this.myfunc = function(num) {
    return num.toString(16);
  }
 }
);

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