Issue with accessing Factory in Controller Method in AngularJS

When I invoke a factory method within the controller, everything works smoothly. However, when I call a factory method within a specific controller method, it returns as undefined.

Below is my factory setup:

app.factory('config', ['$http', '$interval', function($http, $interval, $scope) {
    return {
        lines: function() {
            return $http({
                url: appPath+'/config.php?data=lines',
                method: 'JSON'
            })
        },
        updateLines: function() {
            $http.post(appPath+'/write.php?handler=update line', $scope.lines).
                success(function(data, status, headers, config) {
                    return true;
                }).error(function(data, status, headers, config) {
                    return false;
                });
        }
    }
}]);

My Controller Implementation:

app.controller('lineController', function($scope, $interval, $http, config) {
    // This section executes successfully
    config.lines().success(function(data) {
        $scope.lines=data;
    });

    this.addToLine = function(line, customer) {

    };

    this.unassign = function(customer, line) {
        var index = line.indexOf(customer);
        line.splice(index, 1);

        // Error encountered: Cannot read property 'lines' of undefined
        config.updateLines();
    };
});

In the context of the controller's scope, my factory config is well-defined. However, there seems to be an issue when attempting to reference config within a specific method, leading to the factory being undefined. As I am new to AngularJS, any guidance on best practices in such scenarios would be highly appreciated.

Thank you!

Answer №1

The error message you are encountering seems accurate. The variable $scope.lines is not present in your factory, but rather in your controller. To achieve what you intended, you should pass that value from the controller to the factory as shown below:

Controller function:

config.updateLines($scope.lines);

Factory function:

updateLines: function(lines) {
    $http.post(appPath+'/write.php?handler=update line', lines).
        success(function(data, status, headers, config) {
            return true;
        }).error(function(data, status, headers, config) {
            return false;
        });
}

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