Struggling with passing attributes to an AngularJS directive? You might be encountering the frustrating issue of receiving undefined values for

Currently, I am working on a directive that has four parameters being passed to it, all of which are bound to the directive scope.

The problem I am facing is that despite the data existing and being loaded, the directive is receiving all values as undefined. I considered that the issue might be due to the asynchronous loading of data, but since "page" isn't asynchronous and is available in the scope from the beginning, this doesn't seem to be the cause.

You can access the Plunker demo here: http://plnkr.co/edit/4NEciJZBFZOdJZqR1V6D

Here is the HTML code snippet:

<div ng-controller="myController">
    <itemscounter offset="dataObject.offset" limit="dataObject.limit" total="dataObject.total" page="dataObject.page"></itemscounter>
</div>

And here is the JS code snippet:

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

myApp.controller("myController", function($scope) {
    $scope.dataObject = {
       offset: 1,
       limit: 20,
       total: 25,
       page: 2
    }
});

myApp.directive("itemscounter", function() {

return {
    restrict: "E",
    scope: {
        page: '=',
        total: '=',
        offset: '=',
        limit: '=' 
    },
    template: "<div>Showing products {{offset}} to {{limit}} from {{total}} (Page {{page}})</div>",
    link: function(scope, element, attrs) {

    }
}

});

I would greatly appreciate any assistance provided. Thank you in advance!

Kind regards,

Guillermo

Answer №1

Upon reviewing your description and example, I noticed that the data model was declared outside the controller scope. I have provided a modified version on plunker. The main adjustment I made was moving the data model into the $scope of the controller to ensure proper binding with the directive by Angular.

The original code snippet:

var dataObject = {
  offset: 1,
  limit: 20,
  total: 25,
  page: 2
}

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

myApp.controller("myController", function($scope){

})

was updated to:

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

myApp.controller("myController", function($scope){
  $scope.dataObject = {
    offset: 1,
    limit: 20,
    total: 25,
    page: 2
  };
})

I hope this explanation proves helpful.

Answer №2

To integrate the functionality into your controller, simply include the following line:

$scope.dataObject = dataObject;

For a live demonstration of this implementation, check out my example site.

It's important to note that Angular has limitations on accessing external code, hence why we add the global javascript dataObject variable to the directive's parent scope in this case.

Afterwards, by utilizing the following:

    scope: {
        page: '=',
        total: '=',
        offset: '=',
        limit: '=' 
    },

Your directive's controller establishes a bi-directional binding between $scope.dataObject and the variables within your directive - page, total, offset, and limit.

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