The link function of an AngularJs directive is unable to access the attribute value

I am facing an issue with a directive in AngularJS.

return {
            restrict: _restrict,
            link: function (scope, element, attrs) {
                $timeout(LinkPre, 0);  //Calling a scoped method
            },
            templateUrl: ConstrutorapiTemplatesChart,
            scope: "@",
            controller: Controller
        }

The LinkPre function I am using is as follows:

var LinkPre = function (scope, elem, attrs) {
            attrs.$observe(_attrUrl, function (relatorio) {
                if (relatorio != "") AoMudarUrl(scope, elem, relatorio);
            });
        }

However, I encountered an error stating that the attrs variable is undefined.

It says: Cannot read property '$observe' of undefined.

Does anyone have any insight into why this might be happening?

Note: It is important for me that the Link function is executed after the directive is rendered.

Answer №1

Before anything else, it is crucial to ensure that your parameters are being passed correctly to the function. Additionally, if your function is defined within the associated controller, you must include the controller in the link function and invoke the function using the controller reference.

Consider implementing the following:

link: function (scope, element, attrs, myController) {
    $timeout(myController.LinkPre.bind(this, scope, element, attrs));  
}

Answer №2

the reason why your LinkPre function is returning undefined values is because it is not receiving any arguments when called by timeout. To fix this, you can modify the code like this:

$timeout(function() {
    LinkPre(scope, elem, attrs);
});

You don't need to add an extra zero at the end.

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