Developing object instances using AngularJS

Question

Developing object instances using AngularJS

Looking for some guidance on creating an object using Angular's factory capabilities since I'm new to AngularJS. Here's the code snippet that I have:

angular.module('7minWorkout')
.factory('WorkoutPlan', function(args){
      this.exercises = [];
      this.name = args.name;
      this.title = args.title;
      this.restBetweenExercise = args.restBetweenExercise;
      this.totalWorkoutDuration = function () {
          if (this.exercises.length == 0) return 0;
          var total = 0;
          angular.forEach(this.exercises, function (exercise) {
              total = total + exercise.duration;
          });
          return this.restBetweenExercise * (this.exercises.length - 1) + total;
      }
     return this;
  });

Upon running this, I encountered the following error message:

Error: [$injector:unpr] Unknown provider: argsProvider <- args <- WorkoutPlan

Any insights on what might be causing this issue?

Appreciate any help!

javascript angularjs

Answer 1

Answer №1

A common issue arises when the args argument is not a valid injectable module such as $scope or $http.

To solve this problem, consider defining your class internally and returning a new instance of it. Take a look at an example below:

angular.module('myApp')
.factory('CustomClass', function() {

  var myCustomClass = function(args) {
    this.properties = [];
    this.name = args.name;
    this.description = args.description;
    this.method = args.method;
    this.totalDuration = function() {
      if (this.properties.length == 0) return 0;
      var total = 0;
      angular.forEach(this.properties, function(property) {
        total = total + property.value;
      });
      return this.method * (this.properties.length - 1) + total;
    }
  };

  return {
    create: function(args) {
      return new myCustomClass(args);
    }
  };
});

To use this factory, simply inject CustomClass into the controller or directive, then call CustomClass.create(newArgs); to create an instance.

Answer 2

A common issue arises when the args argument is not a valid injectable module such as $scope or $http.

To solve this problem, consider defining your class internally and returning a new instance of it. Take a look at an example below:

angular.module('myApp')
.factory('CustomClass', function() {

  var myCustomClass = function(args) {
    this.properties = [];
    this.name = args.name;
    this.description = args.description;
    this.method = args.method;
    this.totalDuration = function() {
      if (this.properties.length == 0) return 0;
      var total = 0;
      angular.forEach(this.properties, function(property) {
        total = total + property.value;
      });
      return this.method * (this.properties.length - 1) + total;
    }
  };

  return {
    create: function(args) {
      return new myCustomClass(args);
    }
  };
});

To use this factory, simply inject CustomClass into the controller or directive, then call CustomClass.create(newArgs); to create an instance.

Answer 3

Answer №2

To properly utilize your factory in Angular, you must specify that it requires a parameter by following this format:

angular.module('7minWorkout')
    .factory('WorkoutPlan', ['args', function(args){
        this.exercises = [];
        this.name = args.name;
        this.title = args.title;
        this.restBetweenExercise = args.restBetweenExercise;
        this.totalWorkoutDuration = function () {
            if (this.exercises.length == 0) return 0;
                var total = 0;
                angular.forEach(this.exercises, function (exercise) {
                total = total + exercise.duration;
            });
        return this.restBetweenExercise * (this.exercises.length - 1) + total;
    }
    return this;
}]);

If you don't declare the parameter, Angular will interpret args as a provider being injected into your factory, leading to errors. Refer to this resource for more information (specifically the Factory Recipe section).

Answer 4

To properly utilize your factory in Angular, you must specify that it requires a parameter by following this format:

angular.module('7minWorkout')
    .factory('WorkoutPlan', ['args', function(args){
        this.exercises = [];
        this.name = args.name;
        this.title = args.title;
        this.restBetweenExercise = args.restBetweenExercise;
        this.totalWorkoutDuration = function () {
            if (this.exercises.length == 0) return 0;
                var total = 0;
                angular.forEach(this.exercises, function (exercise) {
                total = total + exercise.duration;
            });
        return this.restBetweenExercise * (this.exercises.length - 1) + total;
    }
    return this;
}]);

If you don't declare the parameter, Angular will interpret args as a provider being injected into your factory, leading to errors. Refer to this resource for more information (specifically the Factory Recipe section).

Developing object instances using AngularJS

Answer №1

Answer №2

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