Storing form information within the view

Question

Storing form information within the view

What is the best way to transfer data between views in AngularJS?

I tried using $rootScope but it's not working as expected.

javascript angularjs angularjs-scope ng-view route-provider

Answer 1

Answer №1

It appears that you are using 2 different controllers for each view (or one for the view and none for the root view).

The issue here is that Angular cannot share data between controllers in this way.

To resolve this, you can either utilize a service/factory or use rootscope, but not in the manner you have done so. You should use broadcast and emit.

If I were in your position, I would opt for using a service.

UPDATE Here's a service for you:

(function() {
'use strict';
angular
    .module('YourModuleName')
    .factory('CountriesService', CountriesService);
CountriesService.$inject = ['Your', 'dependencies', 'here', 'in', 'string'];
/* @ngInject */
function CountriesService(your, dependencies, here, not, in, string) {

    var service = {
        setCountries: setCountries,
        getCountries: getCountries
    };

    var vm = this;
    vm.countries = []; // Or perhaps an object?
    // ... List of other variables you need to store.

    return service;
    ////////////////
    function setCountries(listOfCountries) {
        vm.countries = listOfCountries;
    }

    function getCountries() {
        return vm.countries;
    }
}
})();

This will help you store your variables. In your controller, you can add CountriesService as a dependency. To save, use CountriesService.setCountries, and to retrieve, use CountriesService.getCountries. Keep in mind that refreshing the page will erase all the data!

SECOND UPDATE If you're following John Papa's guidelines, here is a simple service you can implement in the same file where your controller is located:

    app.factory('CountryControl', function(your, dependencies) {

        var service = {
            setCountries: setCountries,
            getCountries: getCountries
        };

        this.countries = []; // Or maybe an object?
        // ... List of other variables you need to store.

        return service;
        ////////////////
        function setCountries(listOfCountries) {
            this.countries = listOfCountries;
        }

        function getCountries() {
            return this.countries;
        }
    });

Answer 2

It appears that you are using 2 different controllers for each view (or one for the view and none for the root view).

The issue here is that Angular cannot share data between controllers in this way.

To resolve this, you can either utilize a service/factory or use rootscope, but not in the manner you have done so. You should use broadcast and emit.

If I were in your position, I would opt for using a service.

UPDATE Here's a service for you:

(function() {
'use strict';
angular
    .module('YourModuleName')
    .factory('CountriesService', CountriesService);
CountriesService.$inject = ['Your', 'dependencies', 'here', 'in', 'string'];
/* @ngInject */
function CountriesService(your, dependencies, here, not, in, string) {

    var service = {
        setCountries: setCountries,
        getCountries: getCountries
    };

    var vm = this;
    vm.countries = []; // Or perhaps an object?
    // ... List of other variables you need to store.

    return service;
    ////////////////
    function setCountries(listOfCountries) {
        vm.countries = listOfCountries;
    }

    function getCountries() {
        return vm.countries;
    }
}
})();

This will help you store your variables. In your controller, you can add CountriesService as a dependency. To save, use CountriesService.setCountries, and to retrieve, use CountriesService.getCountries. Keep in mind that refreshing the page will erase all the data!

SECOND UPDATE If you're following John Papa's guidelines, here is a simple service you can implement in the same file where your controller is located:

    app.factory('CountryControl', function(your, dependencies) {

        var service = {
            setCountries: setCountries,
            getCountries: getCountries
        };

        this.countries = []; // Or maybe an object?
        // ... List of other variables you need to store.

        return service;
        ////////////////
        function setCountries(listOfCountries) {
            this.countries = listOfCountries;
        }

        function getCountries() {
            return this.countries;
        }
    });

Answer 3

Answer №2

In my experience, I have developed an application that handles this task with ease. By utilizing a service, you can effectively address the issue and also set up a system that allows for flexibility throughout your app.

Instead of relying on scope to manage this process, it is advisable to place an object on your controller (such as myFormObj) and assign the desired properties to it (e.g., name, rank, serial number).

Subsequently, establish bindings between the input fields of the form and the properties within that object, rather than using scope variables. This means that your ng-model references would appear as myCtl.formObj.name, and so forth.

Upon triggering the event that alters the view, make a duplicate copy of the formObj using angular.copy and store it in a separate location, typically within a Service (consider naming it FormStateService or similar). This service might simply maintain a basic array.

this.forms = { 'TheNameOfYourForm' : theFormObjToSave };

Thus, when the user activates the event that exits the form, you would execute:

formStateSvc.forms [ 'NameOfMyForm' ] = angular.copy ( theFormObj );

Upon the return of the user to the initial view and the re-initialization of the controller, you could inquire with the formStateSvc:

if ( 'NameOfMyForm' in formStateSvc.forms ) {
   this.formObj = formStateSvc.forms [ 'NameOfMyForm' ];
}

As a result, the previous form's state is successfully restored.

To enhance robustness, you could implement methods like "addForm" and "removeForm," handle scenarios involving undefined values, and streamline the rebind process to the former state (simply instructing your form's controller to restore the state if applicable during initialization). Consequently, your controller might feature:

this.formObj = formStateSvc.rebindOldDataIfItExists ( 'MyFormName' );

This approach offers greater adaptability and efficiency in managing form states within your application.

Answer 4

In my experience, I have developed an application that handles this task with ease. By utilizing a service, you can effectively address the issue and also set up a system that allows for flexibility throughout your app.

Instead of relying on scope to manage this process, it is advisable to place an object on your controller (such as myFormObj) and assign the desired properties to it (e.g., name, rank, serial number).

Subsequently, establish bindings between the input fields of the form and the properties within that object, rather than using scope variables. This means that your ng-model references would appear as myCtl.formObj.name, and so forth.

Upon triggering the event that alters the view, make a duplicate copy of the formObj using angular.copy and store it in a separate location, typically within a Service (consider naming it FormStateService or similar). This service might simply maintain a basic array.

this.forms = { 'TheNameOfYourForm' : theFormObjToSave };

Thus, when the user activates the event that exits the form, you would execute:

formStateSvc.forms [ 'NameOfMyForm' ] = angular.copy ( theFormObj );

Upon the return of the user to the initial view and the re-initialization of the controller, you could inquire with the formStateSvc:

if ( 'NameOfMyForm' in formStateSvc.forms ) {
   this.formObj = formStateSvc.forms [ 'NameOfMyForm' ];
}

As a result, the previous form's state is successfully restored.

To enhance robustness, you could implement methods like "addForm" and "removeForm," handle scenarios involving undefined values, and streamline the rebind process to the former state (simply instructing your form's controller to restore the state if applicable during initialization). Consequently, your controller might feature:

this.formObj = formStateSvc.rebindOldDataIfItExists ( 'MyFormName' );

This approach offers greater adaptability and efficiency in managing form states within your application.

Answer 5

Answer №3

To simplify your code, consider creating a value provider object and making it accessible on the scope:

//Define value provider object
app.value("FormData", {});

app.controller("myController", function($scope, FormData) {
    //Expose on scope
    $scope.FormData = FormData;
});

Then use this object with ng-model directives like so:

Name <input ng-model="FormData.name"><br>
Rank <input ng-model="FormData.rank"><br>
SerialNum <input ng-model="FormData.ssnum"><br>

The value object is a singleton that persists throughout the application's lifecycle. Any modifications made to the object will be saved and accessible to other controllers, even if the view changes.

Check out the DEMO on PLNKR

Answer 6

To simplify your code, consider creating a value provider object and making it accessible on the scope:

//Define value provider object
app.value("FormData", {});

app.controller("myController", function($scope, FormData) {
    //Expose on scope
    $scope.FormData = FormData;
});

Then use this object with ng-model directives like so:

Name <input ng-model="FormData.name"><br>
Rank <input ng-model="FormData.rank"><br>
SerialNum <input ng-model="FormData.ssnum"><br>

The value object is a singleton that persists throughout the application's lifecycle. Any modifications made to the object will be saved and accessible to other controllers, even if the view changes.

Check out the DEMO on PLNKR

Storing form information within the view

Answer №1

Answer №2

Answer №3

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