What could be the reason for the absence of the scoped attribute in the link function?

I am currently in the process of developing a directive that requires additional details to be passed as attributes for the elements.

These attributes have static values and do not have any scoped reference in the parent scope (they are boolean values).

However, when trying to access these attributes in the link function of the directive, they appear as undefined.

Example Markup:

<div ng-app="myApp">
    <div ng-controller="MainCtrl">
        <div my-directive local-attr="attribute" local-ref="ref">
        </div>
    </div>
</div>

Sample JavaScript:

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

myApp.directive('myDirective', function(){
    return {
        scope: {
            localAttr:'@',
            localRef:'='
        },
        link: function(scope, iElement, iAttrs, controller) {
            console.log(scope.localAttr, scope.localRef);
        }
    };
});

myApp.controller('MainCtrl', ['$scope', function($scope){
    $scope.ref="reg"
}]);

In this example, I need to retrieve the value attribute for scope.localAttr within the link function.

Check out the Demo here: Fiddle

Answer №1

When dealing with a static value of 100%, you can simply utilize iAttrs.localAttr without the need for binding in scope: {..}.

If the value requires interpolation (contains {{...}}), then it is recommended to use iAttrs.$observe('localAttr', cb) and exclude it from scope: {...}.

In cases where manipulation with other scope properties is necessary, consider using $scope.watch('localAttr', cb).

It's important to note that the linking of scopes may not be fully constructed at times. AngularJS documentation on the 'scope' parameter of the link function states:

The scope to be used by the directive for registering watches.

For more information, visit http://docs.angularjs.org/guide/directive.

In general, only watchers can be registered, and actual values cannot be retrieved during this process.

Answer №2

There seems to be a potential issue in AngularJS where scope.localAttr is not defined when the linking function is executed. If you modify your code from

console.log(scope.localAttr, scope.localRef);
to
console.log(scope, scope.localAttr, scope.localRef);
, you will notice that scope.localAttr actually has a value when inspecting the scope object. It appears that scope.localAttr is set after the linking function is called, causing it to be undefined within the function.

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