All you need to know about AngularJS and its $routeParams

Question

All you need to know about AngularJS and its $routeParams

Recently, I've been diving into AngularJS and came across an interesting issue. It seems that when I include $RouteParams in the injection of my AngularJS service using .service, but don't actually utilize $RouteParams, the service ceases to work properly.

myApp.service('myService', function() {
    this.name = 'myServiceName';
    var self = this;
    this.nameLength = function () {
        return self.name.length;
    };  
});
myApp.controller('mainController', ['$scope','$log','$routeParams','myService',function($scope, $log,myService,$routeParams) {
    $scope.handle = myService.name;
}]);

I find it odd that only when I make use of $RouteParams in the controller does everything function correctly. Could someone shed some light on why $RouteParams has an impact on the behavior of the .service?

javascript angularjs

Answer 1

Answer №1

The issue does not lie with $routeParams itself, but rather with the order in which dependencies are injected. It is important to ensure that the order of dependencies matches the annotated dependencies. In this case, you have annotated the $routeParams service before myService:

['$scope','$log','$routeParams','myService'

. However, when using them as callback function parameters, you are referencing $routeParams after myService. This results in a mix-up where calling myService.name actually refers to $routeParams, which does not have a property named name. To resolve this issue, simply rearrange your code as shown below:

myApp.service('myService',function(){
      this.name='myServiceName';
      var self=this;
      this.nameLength=function(){
            return self.name.length;
        };  
});

myApp.controller('mainController',  ['$scope','$log','myService','$routeParams',function($scope, $log, myService, $routeParams) {
   $scope.handle = myService.name;
}]);

Answer 2

The issue does not lie with $routeParams itself, but rather with the order in which dependencies are injected. It is important to ensure that the order of dependencies matches the annotated dependencies. In this case, you have annotated the $routeParams service before myService:

['$scope','$log','$routeParams','myService'

. However, when using them as callback function parameters, you are referencing $routeParams after myService. This results in a mix-up where calling myService.name actually refers to $routeParams, which does not have a property named name. To resolve this issue, simply rearrange your code as shown below:

myApp.service('myService',function(){
      this.name='myServiceName';
      var self=this;
      this.nameLength=function(){
            return self.name.length;
        };  
});

myApp.controller('mainController',  ['$scope','$log','myService','$routeParams',function($scope, $log, myService, $routeParams) {
   $scope.handle = myService.name;
}]);

Answer 3

Answer №2

When creating controllers, it is recommended to follow this structure for clarity and ease of readability:

myApp.controller('mainController', function($scope, $log, myService, $routeParams) {
    $scope.handle = myService.name;
});

Answer 4

When creating controllers, it is recommended to follow this structure for clarity and ease of readability:

myApp.controller('mainController', function($scope, $log, myService, $routeParams) {
    $scope.handle = myService.name;
});

Answer 5

Answer №3

Aditya Singh did a great job explaining this concept. To avoid making this error, consider updating your code style to the following format:

myApp.controller('mainController',
['$scope', '$log', '$routeParams', 'myService',
function($scope, $log, $routeParams, myService) {
    $scope.handle = myService.name;
}]);

By following this structure, you can also prevent excessive vertical scrolling when dealing with multiple injections in your controller.

Answer 6

Aditya Singh did a great job explaining this concept. To avoid making this error, consider updating your code style to the following format:

myApp.controller('mainController',
['$scope', '$log', '$routeParams', 'myService',
function($scope, $log, $routeParams, myService) {
    $scope.handle = myService.name;
}]);

By following this structure, you can also prevent excessive vertical scrolling when dealing with multiple injections in your controller.

All you need to know about AngularJS and its $routeParams

Answer №1

Answer №2

Answer №3

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