Angularjs scope throws TypeError when attempting to add an array

Question

Angularjs scope throws TypeError when attempting to add an array

As someone diving into the world of Angular and JavaScript, I am tackling the challenge of creating a directive that requires adding an array to the directive's scope. Here's a snippet of the code for my directive:

.directive("startupSections", function(){
    return {
        restrict: "E",
        transclude: true,
        scope: {
            title: "@",
            sections: [1,2,3]
        },
        link: function(scope, elem, attrs){
            console.log (scope);
        }

    }
});

However, upon execution, I encounter the following error:

TypeError: definition.match is not a function
    at angular.js:7992
    at forEach (angular.js:417)
    at parseIsolateBindings (angular.js:7987)
    at parseDirectiveBindings (angular.js:8028)
    at addDirective (angular.js:9984)
    at collectDirectives (angular.js:9142)
    at compileNodes (angular.js:8974)
    at compileNodes (angular.js:8990)
    at compileNodes (angular.js:8990)
    at compile (angular.js:8859)

If I use a string or number instead of an array for the value of "sections," the error disappears. How can I properly assign an array as the value of a property in the scope?

javascript angularjs

Answer 1

Answer №1

When working with directives, it's important to understand that the scope object is not meant for instantiating scope variables. Instead, it consists of key-value pairs that map scope variables of the directive to the controller's variables.

If you have a 'section' array that needs to be passed from the controller to the directive, you should define the array in the controller and bind it to the directive using the following syntax:

scope: {
        title: "@",
        sections: "="
    },

Your controller code should look something like this:

$scope.sectionsArray = [1,2,3]

This array will then be accessible as a scope property in your directive, allowing you to use it like this:

<startup-sections title='SomeTitle' sections="sectionsArray" >

If the array is local to the directive, you can declare it within the link phase of the directive like so:

.directive("startupSections", function(){
return {
    restrict: "E",
    transclude: true,
    scope: {
        title: "@"
    },
    link: function(scope, elem, attrs){
        scope.sections = [1,2,3]
        console.log (scope);
    }

  }
});

I hope this explanation helps clarify things!

Answer 2

When working with directives, it's important to understand that the scope object is not meant for instantiating scope variables. Instead, it consists of key-value pairs that map scope variables of the directive to the controller's variables.

If you have a 'section' array that needs to be passed from the controller to the directive, you should define the array in the controller and bind it to the directive using the following syntax:

scope: {
        title: "@",
        sections: "="
    },

Your controller code should look something like this:

$scope.sectionsArray = [1,2,3]

This array will then be accessible as a scope property in your directive, allowing you to use it like this:

<startup-sections title='SomeTitle' sections="sectionsArray" >

If the array is local to the directive, you can declare it within the link phase of the directive like so:

.directive("startupSections", function(){
return {
    restrict: "E",
    transclude: true,
    scope: {
        title: "@"
    },
    link: function(scope, elem, attrs){
        scope.sections = [1,2,3]
        console.log (scope);
    }

  }
});

I hope this explanation helps clarify things!

Angularjs scope throws TypeError when attempting to add an array

Answer №1

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