When triggered by an event, a different function is unable to access the Angular scope variable as it is

Question

When triggered by an event, a different function is unable to access the Angular scope variable as it is

Service

angular.module('tested-user')
.service('tests', function($http, $q){
    this.getTests = $q.when($http.get('http://localhost:3000/tests.json'));});

Controller

tests.getTests.then(function(data){
        noOfTests = data.data.tests.length;
        $scope.testsForSearch = data.data.tests;
        while($scope.testsForSearch.length){
            if($scope.testsForSearch.length > 1 )
            {
                $scope.tests.push(testsForSearch.splice(0,2));
            }
            else{
                $scope.tests.push(testsForSearch.splice(0,1));
            }
        }
        // data is empty here also
        console.log(data);
    }

Function in the Controller that uses the scope variable

$scope.search = function(){
        console.log($scope.testsForSearch.tests);
        $scope.testsForSearch.tests.forEach(function(test){
            if(test.name.search($scope.searchInput)){
                $scope.tests.push(test);
            }
        });
    }

The scope.search function will be triggered by a click event. It appears that the 'search' function is unable to access data stored in 'scope.testsForSearch', which is available in the views and where the 'tests.getTests' function is executed.

javascript angularjs

Answer 1

Answer №1

One important update needs to be made in the controller. Change this line: testsForSearch = data.data.tests; to $scope.testsForSearch = data.data.tests;

If not updated, the variable will remain local to the controller and will not be visible outside of it.

Answer 2

One important update needs to be made in the controller. Change this line: testsForSearch = data.data.tests; to $scope.testsForSearch = data.data.tests;

If not updated, the variable will remain local to the controller and will not be visible outside of it.

Answer 3

Answer №2

Why have you utilized the http.get function, which returns a promise, within an $q function that also should return a promise as it is typically used for asynchronous method calls? Consider either removing the $q or implementing additional logic to handle the data appropriately.

Answer 4

Why have you utilized the http.get function, which returns a promise, within an $q function that also should return a promise as it is typically used for asynchronous method calls? Consider either removing the $q or implementing additional logic to handle the data appropriately.

Answer 5

Answer №3

It seems like the issue here is with how function(){} handles variable scope in JavaScript. Anything defined outside of the function may not necessarily be accessible within it, particularly in cases involving the angular $scope variable.

$scope.testing=5;
$scope.run=function(){
      console.log($scope.testing);
};

The above code won't work as expected because $scope.testing is not defined within the function. However, you can make it work by defining a local variable first:

$scope.testing=5;
var testing=$scope.testing;
$scope.run=function(){
    console.log(testing);
}

Thanks to Angular data binding, changes made to the testing variable inside the function will reflect on the $scope.testing variable outside of the function.

One potential solution could be to assign $scope to a local variable like this var scope=$scope;, which might resolve the issue. Another option is to use arrow functions that don't create their own scope but come with the limitation of being anonymous and therefore hard to reference later on without a name.

You could also experiment with passing $scope as a parameter to your function, although this approach may prove challenging and incompatible with some handlers. The provided code does work, so any alternative methods will require further exploration.

Answer 6

It seems like the issue here is with how function(){} handles variable scope in JavaScript. Anything defined outside of the function may not necessarily be accessible within it, particularly in cases involving the angular $scope variable.

$scope.testing=5;
$scope.run=function(){
      console.log($scope.testing);
};

The above code won't work as expected because $scope.testing is not defined within the function. However, you can make it work by defining a local variable first:

$scope.testing=5;
var testing=$scope.testing;
$scope.run=function(){
    console.log(testing);
}

Thanks to Angular data binding, changes made to the testing variable inside the function will reflect on the $scope.testing variable outside of the function.

One potential solution could be to assign $scope to a local variable like this var scope=$scope;, which might resolve the issue. Another option is to use arrow functions that don't create their own scope but come with the limitation of being anonymous and therefore hard to reference later on without a name.

You could also experiment with passing $scope as a parameter to your function, although this approach may prove challenging and incompatible with some handlers. The provided code does work, so any alternative methods will require further exploration.

When triggered by an event, a different function is unable to access the Angular scope variable as it is

Answer №1

Answer №2

Answer №3

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