retrieve information instantly on AngularJS by utilizing $http or $resource

I designed a plugin for field customization.

angular.module('ersProfileForm').directive('ersProfileEditableField', ['$templateCache', '$compile', 'profileFieldService', 'RolesService',
                                                           function($templateCache,   $compile,   profileFieldService , RolesService){
return {
    restrict: 'AE',
    templateUrl: '',
    scope: {
        ersProfileEditableField: '=',
        ersProfileSectionData: '=',
        ersProfileEditableFieldValue: '=',
        ersBulkEdit: '<'
    },
    controller: ['$scope', '$http','$q','$resource', function($scope, $http, $q, $resource){
        $http.get('rest/roles',{}).then(function(response){
            $scope.roles = response.data;
        }); 

    }],
    link: function(scope, iElement, iAttrs, controller){
        iElement.append(jQuery(profileFieldService.getTemplate(scope.ersProfileEditableField.type, scope)));
        $compile(iElement.contents())(scope);
    }
};
}]);

The role's data is essential for this template.

 angular.module('ersProfileForm').factory('profileFieldService', ['$resource', function($resource){
var factory = {};
factory.getTemplate = function(type, scope){
    scope.field = scope.ersProfileEditableField; 
    var tpl = '<div ng-repeat ="role in roles"'> 
            +' <label>{{role.name</label>'
            +' </div>'
        break;
return tpl;
};
return factory;
}]);

My issue is that I need the roles array in the template, but the service has a delay in fetching it, so roles are not defined at first, and this results in executing later times.

Is there a way to ensure that the roles data is fetched before moving on to the template as specified in the link section?

Answer №1

Experiment with the following code snippet:

var template = '<div ng-repeat ="role in roles" ng-show="roles&&(roles.length>0)"> '+' <label>role.name</label>' +' </div>'

Answer №2

Have you experimented with leveraging the $q promise object? You can resolve it within your $http method, and then utilize it with .then :] Check out this helpful link in the documentation: https://docs.angularjs.org/api/ng/service/$q

Answer №3

To incorporate data into the DOM, the template requires double curly brackets {{ }}:

factory.getTemplate = function(type, scope){
    scope.field = scope.ersProfileEditableField; 
    var tpl = '<div ng-repeat ="role in roles"'> 
          // +' <label>role.name</label>'
          // USE {{ }} for interpolation
            +' <label>{{role.name}}</label>'
            +' </div>'
    return tpl;
};

You can delay compilation by implementing a watcher:

link: function(scope, iElement, iAttrs, controller){
    scope.$watch("::roles", function (newValue) {
        if (newValue) {
            iElement.append(
                profileFieldService
                    .getTemplate(scope.ersProfileEditableField.type, scope)
            );
            $compile(iElement.contents())(scope);
        };
    });
}

The watcher waits for the roles data fetched from the server before initiating the compilation process. It employs a one-time binding to ensure that compilation happens only once, while the ng-repeat directive continues updating the DOM as the value of roles changes.

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