``Obtaining information from an Angular factory with the assistance of BreezeJs

Question

``Obtaining information from an Angular factory with the assistance of BreezeJs

Incorporating an Angular factory into my project has been a focus of mine lately.

Routing functionality has been successfully set up in ArtLogMain.js

var ArtLog = angular.module('ArtLog', ['ngGrid', 'ui.bootstrap']);

ArtLog.config(function ($locationProvider, $routeProvider) {
    $locationProvider.html5Mode(true);

    $routeProvider.when("/ArtLog", {
        controller: "ArtLogCtrl",
        templateUrl: "/Templates/ArtLog/Index.html"
    });

    $routeProvider.when("/ArtLog/:Id", {
        controller: "ArtLogEditCtrl",
        templateUrl: "/Templates/ArtLog/Edit.html"
    });

    $routeProvider.when("/ArtLog/Dashboard", {
        controller: "ArtLogDashBoardCtrl",
        templateUrl: "/Templates/ArtLog/Dashboard.html"
    });

    $routeProvider.otherwise("/");
});

Next step was to define the Factory: ArtLogDataService

ArtLog.factory("ArtLogDataService", function ($q) {
    breeze.config.initializeAdapterInstance("modelLibrary", "backingStore", true);

    var _artLogView = [];
    var _artLogSingle = [];

    var _getArtLogById = function (Id) {

        var deferred = $q.defer();

        var manager = new breeze.EntityManager('breeze/BreezeData');
        var query = new breeze.EntityQuery().from('Project').where("Id", "Equals", Id);

        manager.executeQuery(query).then(function (data) {
            angular.copy(data, _artLogSingle);
            deferred.resolve();
        }).fail(function () {
            deferred.reject();
        });

        return deferred.promise;
    };

    var _getArtLogView = function () {

        var deferred = $q.defer();

        var manager = new breeze.EntityManager('breeze/BreezeData');
        var query = new breeze.EntityQuery().from('ArtLogView');

        manager.executeQuery(query).then(function (data) {
            //angular.copy(data.results, _artLogView);
            _artLogView = data.results;
            deferred.resolve();
        }).fail(function () {
            deferred.reject();
        });

        return deferred.promise;
    };

    return {
        artLogView: _artLogView,
        artLogSingle: _artLogSingle,
        getArtLogView: _getArtLogView,
        getArtLogById: _getArtLogById
    };
})

The Controller is defined as ArtLogController.js

function ArtLogCtrl($scope, ArtLogDataService) {
    $scope.ArtLogData = ArtLogDataService;
    $scope.editableInPopup = '<button id="editBtn" type="button" class="btn btn-primary" ng-click="edit(row)" >Edit</button>';

    ArtLogDataService.getArtLogView();

    $scope.edit = function (row) {
        window.location.href = '/ArtLog/' + row.entity.Id;
    };

    $scope.gridOptions = {
        data: ArtLogDataService.artLogView,
        showGroupPanel: true,
        enablePinning: true,
        showFilter: true,
        multiSelect: false,
        columnDefs: [
            { displayName: 'Edit', cellTemplate: $scope.editableInPopup, width: 80, pinned: true, groupable: false, sortable: false },
            { field: 'ArtNum', displayName: 'Art Number', resizable: true, pinned: true, groupable: false, width: '100px' },
            { field: 'CreateDate', displayName: 'Date Created', cellFilter: "date:'MM-dd-yyyy'", pinnable: false, width: '110px' },
            { field: 'ArtCompletionDue', displayName: 'Art Comp Due Date', cellFilter: "date:'MM-dd-yyyy'", pinnable: false, width: '160px', enableCellEdit: true },
            { field: 'DaysLeft', displayName: 'Days Left', pinnable: false, width: '90px' },
            { field: 'RevisionNum', displayName: 'Rev Number', pinnable: false, width: '100px' },
            { field: 'Status', displayName: 'Status', pinnable: false, width: '80px' },
            { field: 'Template', displayName: 'Template', pinnable: false, width: '190px' },
            { field: 'Driver', displayName: 'Driver', pinnable: false, width: '160px' },
            { field: 'AssignedTo', displayName: 'Assigned To', pinnable: false, width: '160px' },
            { field: 'BuddyArtist', displayName: 'Buddy Artist', pinnable: false, width: '160px' }
        ],
        filterOptions: {
            filterText: "",
            useExternalFilter: false
        }
    };
}

A debugging breakpoint on ArtLogDataService.getArtLogData shows that the call is triggered. The query runs and returns data, but for some reason, the data doesn't seem to bind to artLogView within the ArtLogDataService object returned from the factory.

Any insights would be greatly appreciated!

javascript angularjs breeze

Answer 1

Answer №1

One issue is that the network callback from Breeze isn't synced with the Angular update loop. This means Angular doesn't recognize changes in your data, so the view binding watcher doesn't get updated.

To fix this, you should include a $scope.$apply() call when your data returns. This will prompt the bindings to acknowledge the data change and update accordingly.

You could try something like this:

ArtLogDataService.getArtLogView().then(function() {
    $scope.$apply();
});

If all actions are done within Angular, there's no need to manually call $scope.$apply, as Angular handles mutations (such as events, network responses, timeouts) through mechanisms like $http and

$timeout</code), automatically triggering <code>$apply

. It's only when external events impact data that $scope.$apply becomes necessary.

Hopefully, this resolves your issue!

Answer 2

One issue is that the network callback from Breeze isn't synced with the Angular update loop. This means Angular doesn't recognize changes in your data, so the view binding watcher doesn't get updated.

To fix this, you should include a $scope.$apply() call when your data returns. This will prompt the bindings to acknowledge the data change and update accordingly.

You could try something like this:

ArtLogDataService.getArtLogView().then(function() {
    $scope.$apply();
});

If all actions are done within Angular, there's no need to manually call $scope.$apply, as Angular handles mutations (such as events, network responses, timeouts) through mechanisms like $http and

$timeout</code), automatically triggering <code>$apply

. It's only when external events impact data that $scope.$apply becomes necessary.

Hopefully, this resolves your issue!

Answer 3

Answer №2

Avoid using $q.deferred in query callbacks, stick to the promises returned by Breeze EntityManager methods. When utilizing the Breeze.Angular module as outlined in the documentation and shown in examples like "Todo-Angular", you already have access to $q promises.

Eliminate custom promises to remove the need for $apply.

Consider implementing code similar to this:

// Initialize or retrieve the manager ONCE throughout the data service's lifecycle
// For better testability, consider using a dedicated "entityManagerFactory" service
// to obtain your manager.
var manager = new breeze.EntityManager('breeze/BreezeData');

var _getArtLogView = function () {

    return breeze.EntityQuery.from('ArtLogView')
                 .using(manager).execute()
                 .then(success)
                 .catch(fail); // Use only if necessary to handle failures

    function success(data) { return data.results; }

    function fail(error) { 
       // Implement logging or relevant error handling;
       // Omit fail if not needed in this context
       return $q.reject(error); // Ensure caller is aware of the error
    }
};

Answer 4

Avoid using $q.deferred in query callbacks, stick to the promises returned by Breeze EntityManager methods. When utilizing the Breeze.Angular module as outlined in the documentation and shown in examples like "Todo-Angular", you already have access to $q promises.

Eliminate custom promises to remove the need for $apply.

Consider implementing code similar to this:

// Initialize or retrieve the manager ONCE throughout the data service's lifecycle
// For better testability, consider using a dedicated "entityManagerFactory" service
// to obtain your manager.
var manager = new breeze.EntityManager('breeze/BreezeData');

var _getArtLogView = function () {

    return breeze.EntityQuery.from('ArtLogView')
                 .using(manager).execute()
                 .then(success)
                 .catch(fail); // Use only if necessary to handle failures

    function success(data) { return data.results; }

    function fail(error) { 
       // Implement logging or relevant error handling;
       // Omit fail if not needed in this context
       return $q.reject(error); // Ensure caller is aware of the error
    }
};

``Obtaining information from an Angular factory with the assistance of BreezeJs

Answer №1

Answer №2

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