Learn the process of invoking an Angular scope function from within a JavaScript function located within a controller

Question

Learn the process of invoking an Angular scope function from within a JavaScript function located within a controller

In my Angular controller, I have a JavaScript function where I am trying to call an Angular function. However, I am encountering the error: $scope.Name is not a function, $scope.dates is not a function.

     function validation() {
            $scope.pageload = true;

            $scope.Name();
            $scope.dates();  
        }

        $scope.Name = function () {
           // do something
        }

        $scope.dates = function () {
          // do something       
        }

Everything works fine inside the controller.

    var MyController = function ($scope, service)
    {


       function validation() {

            $scope.pageload = true;

            $scope.Name();
         $scope.dates();

        }

       $scope.Name = function () {


            // do something
        }

     $scope.dates = function () {

            // do something

    }


});


working:


var MyController = function ($scope, service)
{
 LoginHomeService.getHomeService(function (data) {
                $rootScope.CT1SessionObj = data.CT1SessionObj;

                        validation();



                                    }, function (response) {
                                        alert(response.Message);
                                    });

   function validation() {

        $scope.pageload = true;

        $scope.Name();
     $scope.dates();

    }

   $scope.Name = function () {


        // do something
    }

 $scope.dates = function () {

        // do something




});




Not working:

    var MyController = function ($scope, service)
    {
     LoginHomeService.getHomeService(function (data) {
                    $rootScope.CT1SessionObj = data.CT1SessionObj;

                            validation();


   function validation() {

        $scope.pageload = true;

         $scope.Name();
         $scope.dates();

        }

       $scope.Name = function () {


            // do something
        }

     $scope.dates = function () {

            // do something

    }


   }, function (response) {
    alert(response.Message);
   });


   });

javascript angularjs angularjs-directive

Answer 1

Answer №1

To ensure proper functionality, declare the variables $scope.Name and $scope.dates at the beginning of the validation() function.

In JavaScript, functions are executed in the order they appear in the code. Therefore, declaring $scope.Name and $scope.Dates within the MyCtrl function ensures they are defined before being used.

Avoid naming a function 'Name' as it is a reserved keyword. It's best practice to use meaningful names for functions to prevent conflicts.

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

//myApp.directive('myDirective', function() {});
//myApp.factory('myService', function() {});

function MyCtrl($scope) {

    $scope.Name = function() {
    // do something
  }

  $scope.dates = function() {
    // do something       
  }

  function validation() {
    $scope.pageload = true;

    $scope.Name();
    $scope.dates();
  }
}

Fiddle: http://jsfiddle.net/Lvc0u55v/4872/

An alternative approach following the 'John Papa style' can be found here: Y033

Organize bindable members at the top of the controller, alphabetized, and not scattered throughout the code.

Why?: This structure enhances readability and facilitates identifying which members of the controller are bindable and usable in the View.

Why?: Placing anonymous functions inline may seem convenient, but longer functions can reduce readability. Defining functions below bindable members (the functions will be hoisted) moves implementation details down, keeps bindable members at the top, and improves readability.

/* avoid */
function SessionsController() {
    var vm = this;

    vm.gotoSession = function() {
      /* ... */
    };
    vm.refresh = function() {
      /* ... */
    };
    vm.search = function() {
      /* ... */
    };
    vm.sessions = [];
    vm.title = 'Sessions';
}


/* recommended */
function SessionsController() {
    var vm = this;

    vm.gotoSession = gotoSession;
    vm.refresh = refresh;
    vm.search = search;
    vm.sessions = [];
    vm.title = 'Sessions';

    ////////////

    function gotoSession() {
      /* */
    }

    function refresh() {
      /* */
    }

    function search() {
      /* */
    }
}

Answer 2

To ensure proper functionality, declare the variables $scope.Name and $scope.dates at the beginning of the validation() function.

In JavaScript, functions are executed in the order they appear in the code. Therefore, declaring $scope.Name and $scope.Dates within the MyCtrl function ensures they are defined before being used.

Avoid naming a function 'Name' as it is a reserved keyword. It's best practice to use meaningful names for functions to prevent conflicts.

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

//myApp.directive('myDirective', function() {});
//myApp.factory('myService', function() {});

function MyCtrl($scope) {

    $scope.Name = function() {
    // do something
  }

  $scope.dates = function() {
    // do something       
  }

  function validation() {
    $scope.pageload = true;

    $scope.Name();
    $scope.dates();
  }
}

Fiddle: http://jsfiddle.net/Lvc0u55v/4872/

An alternative approach following the 'John Papa style' can be found here: Y033

Organize bindable members at the top of the controller, alphabetized, and not scattered throughout the code.

Why?: This structure enhances readability and facilitates identifying which members of the controller are bindable and usable in the View.

Why?: Placing anonymous functions inline may seem convenient, but longer functions can reduce readability. Defining functions below bindable members (the functions will be hoisted) moves implementation details down, keeps bindable members at the top, and improves readability.

/* avoid */
function SessionsController() {
    var vm = this;

    vm.gotoSession = function() {
      /* ... */
    };
    vm.refresh = function() {
      /* ... */
    };
    vm.search = function() {
      /* ... */
    };
    vm.sessions = [];
    vm.title = 'Sessions';
}


/* recommended */
function SessionsController() {
    var vm = this;

    vm.gotoSession = gotoSession;
    vm.refresh = refresh;
    vm.search = search;
    vm.sessions = [];
    vm.title = 'Sessions';

    ////////////

    function gotoSession() {
      /* */
    }

    function refresh() {
      /* */
    }

    function search() {
      /* */
    }
}

Answer 3

Answer №2

It is important to note, as emphasized by @Harald Wiesinger, that functions should be declared before they are called in the code.

Answer 4

It is important to note, as emphasized by @Harald Wiesinger, that functions should be declared before they are called in the code.

Answer 5

Answer №3

Ensure validation is placed after the scope functions

$scope.Username = function () {
   // perform an action
}

$scope.passwords = function () {
  // handle something       
}

function checkValidation() {
    $scope.isLoaded = true;

    $scope.Username();
    $scope.passwords();  
}

Answer 6

Ensure validation is placed after the scope functions

$scope.Username = function () {
   // perform an action
}

$scope.passwords = function () {
  // handle something       
}

function checkValidation() {
    $scope.isLoaded = true;

    $scope.Username();
    $scope.passwords();  
}

Learn the process of invoking an Angular scope function from within a JavaScript function located within a controller

Answer №1

Answer №2

Answer №3

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