Tips on developing a limited directive?

Currently, I am experimenting with AngularJS and NG-Table and facing a challenge that I cannot seem to resolve:

My issue involves displaying a collection of User objects from a Django application in an NG-Table. One of the attributes of the model is a boolean value that indicates whether the object is active or not. Instead of showing true or false, I would like to display a glyph from the Font Awesome set using an AngularJS directive.

After trying out various examples, I have come up with the following code snippets:

The module definition:

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

Loading the user objects for the table:

main.factory('User', function ($http) {
    return {
        async: function() {
            var promise = $http.get('api/v1/users').then(function (response) {
                return response.data["objects"];
            });
            // Return the promise to the controller
            return promise;
        }
    };
});

The controller along with the directive responsible for converting the boolean value to the desired glyph:

main.controller("UsersCtrl", function ($scope, $filter, ngTableParams, User) {
    User.async().then(function(data) {
        $scope.tableParams = new ngTableParams({
            page: 1,
            count: 4,
            sorting: {
                name: 'asc'
            }
        },{
            total: data.length, 
            getData: function ($defer, params) {
                var orderedData = params.sorting() ? $filter('orderBy')(data, params.orderBy()) : data;
                $defer.resolve(orderedData.slice((params.page() - 1) * params.count(), params.page() * params.count()));
            }
        });
    });
}).directive('boolean', function () {
    return {
        restrict: 'E',
        link: function (scope, elem, attrs) {
            var userObject = scope.userObject;
            if (userObject["active"]) {
                console.log("active");
                console.log(elem);
                elem.html = "<i class='fa fa-check text-success fa-lg'></i>";
            } else {
                console.log("not active");
                console.log(elem);
                elem.html = "<i class='fa fa-times text-danger fa-lg'></i>";
            }
        }
    }
});

In my HTML template:

<table ng-table="tableParams" class="table">
    <tr ng-repeat="propertyObject in $data">
        <td data-title="'Name'" sortable="'name'">
            [[ userObject.name ]]
        </td>
        <td>
            <boolean>[[ userObject.active ]]</boolean>
        </td>
    </tr>
</table>

However, due to conflicts with Django template syntax, I had to switch Angular's default double curly brackets to square brackets.

While the table displays correctly, the boolean directive does not render the correct glyph and still shows true/false. By logging to the console, I can see that the objects are correct. I must be overlooking something essential, so any guidance on what it might be would be greatly appreciated...

Answer №1

If you find yourself facing an issue where you need to ensure that ng-repeat completes its digest cycle before attempting to manipulate the HTML element, there are various approaches you can take. These include utilizing attrs.$observe or $timeout.

The core problem is that your code is executing before the element has been fully rendered.

In your case, for a simpler solution, you could opt for using ng-class and avoid the need for a directive altogether.

<table ng-table="tableParams" class="table">
    <tr ng-repeat="propertyObject in $data">
        <td data-title="'Name'" sortable="'name'">
            [[ userObject.name ]]
        </td>
        <td>
            <i class='fa fa-times fa-lg' 
             ng-class="{'text-danger':!userObject.active,'text-success':userObject.active}">
            </i>
        </td>
    </tr>
</table>

Alternatively, you could simplify the directive by just returning the <i> as the template and utilize ng-class.

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