Angular allows using forRoot() only once in the application. If seanperkins is not suspended, they can still re-publish their posts from their dashboard. Next, add code in GreetComponent as shown in the next code listing: GreetComponent has an @Input() decorated property to accept data from the parent component and an @Output() decorated EventEmitter so that the event raised here can be handled in the parent component. In this scenario you can use promises then method to lazy load a component as shown in the next code listing: In the above function, everything is the same. Once unpublished, this post will become invisible to the public If I updated shared configured with Progress is the leading provider of application development and digital experience technologies. LogRocket is like a DVR for web and mobile apps, recording literally everything that happens on your site including network requests, JavaScript errors, and much more. The dynamic import API is a standard browser's API introduced in modern browers. Once unsuspended, seanperkins will be able to comment and publish posts again. The loadChildren can be defined using string or LoadChildrenCallback. Firstly, we define all the routes in a single file, routes.ts, for easier maintenance. For further actions, you may consider blocking this person and/or reporting abuse.

So I figured I can enforce it by using named outlets. We do however, want all customers to share the primary functionality of our platform - content management and learning delivery. __|- sub-feature1.module.ts What if my remote module is routable? If your two Angular applications are using Angular Elements, you may need to share the PlatformRef between these (via the window global). Will I still be able to download them just once? This only matters for local development. The usage of mono-repos, only simplifies set-up and maintenance; by making use of schematics to generate webpack configs and establish the remote entries. To apply different styles for each app, we create the following scss files: In the Angular.json file, the styles are mapped to different builds. If you wish to change this at any time you may do so by clicking here. You want to serve one app that can respond to "X" and "Y". As shown in the above example app, each portal picks their own feature modules and lazy-loads them.

To build the app in production mode, we run the following command. If you eco-system is small enough or not having live reloading against the remote isn't a deal breaker, you can federate the AppModule from the remote and not run into any issues. Define all required routes for the new lazy loaded module inside Route array. In your example, does the feature.module.ts have a component with a router outlet and a router module declaration for forChild([])?


The parent component is a component in which GreetComponent will be loaded dynamically. The Next step would be to create a separate route file inside the new module. At this point, we are rolling. Thank you for your continued interest in Progress. When we click on "lazy loading" link, angular routing module loads the feature module and its component as a single file to the user's browser. This file is used to define lazy loading for our feature module. Let's assume you have the following mono-repo: Shell is your consuming application. He is a published author, a well-known speaker, a Google Developer Expert, and a 10-time winner of the Microsoft MVP Award. The function will filter the routes and set routes into the current router, and the function will be completed before the app completely starts. With you every step of your journey. Step 3: Create Demo component inside the "feature-module-example". While the example schematic will generate the exposes section with the AppModule and AppComponent I would strongly advise against this. We will be using an injection token to store our route definitions as they relate to module federation.

So I ended up adding this to the route module code: Specifically I added multi:true but now I get the following error: Error: NG0200: Circular dependency in DI detected for InjectionToken ROUTES. It is the highest container, responsible for what pieces are pulled in and the composition of features. This helps to keep the initial bundle size small, so initial load time is decreased.

When we run the application and look at the network tab, only "main.js" file is get loaded. In this article, we walk through an Angular app with two frontends. Now enhanced with: This article explains various ways of lazy loading a component in Angular, including via an import statement inside an async-await function and via the then method. DEV Community 2016 - 2022. I found the problem. I won't be able to necessarily keep all micro-frontends up to date with latest Angular, and Shell instance might move ahead in versions. Unfortunately I hit the wall with this approach (exposing the app.module.ts and app.component.ts). It does not contain HTML and code for feature module and demo component. Since the app contains two environments, default and doctor, we need to add the following configuration into the Angular.json file. The lazy loadof the modules can be done using the root routing module. The Remote; is lazy loaded successfully, loaded on but Remote module is rendered from the single @angular/core instance from Shell. You can view or download the source code from the GitHub link here. Micro frontends and more importantly module federation, allows developers the flexibility of remotely requesting a module on the network and bootstrapping that module into their application.

When the routes are changed, the menu will update automatically. Thank you for the reply it saved me a lot of time, I will just add on to your answer for more clarity for those in the future who will face this problem. Also I had a question about the usage of cdn, if I have extra business logic like making calls to another server in my exposed remote module and if I hosted that particular mfe in a cdn will it work out of the box or will CORS give me trouble? It opens up a lot of new features and also provides a simpler API to achieve specific tasks such as lazy (dynamically) loading a component. To create a new component, we can use the following CLI command: Using the above CLI commands, we can set up our project structure as below. One of the many benefits of micro frontends and module federation, is that you can pull in different frameworks, versions, etc. Read our angular tutorial and join our #DailyAngularChallenge where we learn to build If you are looking for a great deep-dive into module federation and micro-frontends, I suggest reading: The commands will generate a patient folder which contains the module, routing, and component files. If you have any questions about this article, ask them in our GitHub Discussions It hosts all of the sub-components within the module. Here --skip-import flag is used so that Angular does not declare GreetComponent in the module, as you wish to load GreetComponent dynamically. The example below shows the admin feature module and its root component: AdminViewComponent. This immediately fires a run-time error: Error: inject() must be called from an injection context. In bootstrap.ts we will consume this asset and build the injection token value: By passing the providers to platformBrowserDynamic, we are setting a static provider value prior to bootstrap, that can be used on bootstrap. You now need to use the dynamic import syntax to import your module in the loadChildren property of Angular Router routes. I just don't even know where to start to debug this. To make these apps compatible with module federation, you will need to run the schematic on their projects: You can configure the port to be whatever you desire. When the host loads the remote, the remote's sub-route gets loaded in the host's router-outlet, without running the remote's app.component.ts (nothing runs from the remote's app.component.ts and the content of app.component.html is not rendered). The lazy-loading feature modules are built into small bundle files, which will only be downloaded to the client browser when the router is navigated to. The home screens for both the patient and doctor portals are shown below. Dev Community to discuss anything related to Angular development. ` If you read this far I appreciate it. Open the src/app/admin/admin.module.ts file and import the exported admin routing module as follows: Next, add it to the imports array of the admin module: That's all we need to set up lazy-loaded modules in Angular 10/9. Find him on Twitter or GitHub. This is fine if our application is small and has limited functionality but for the large application, this will increase the initial load time for the application. The source code for the example project, including the CSS style files we mentioned earlier, can be found on my GitHub. Subscribe to be the first to get our expert-written articles and tutorials for developers! How to pass the injection token from the shell to the remote app? This work is licensed under a Creative Commons Attribution-NonCommercial- ShareAlike 4.0 International License. This design results in better performance because each app wont load the modules that are not required. Most of the samples you can find online assume that you have a monerepo. Lazy loading is the process of loading some features of your Angular application only when you navigate to their routes for the first time. Thus, only the relevant routes will be loaded into the app. Angular allows us to pass data to @Input() decorated properties and handle events of lazy-loaded components using the instance property of the lazy-loaded component. Routes are the backbone for Angular. The fileReplacements setting below specifies that the default environment.ts file will be replaced by the file at runtime. Progress collects the Personal Information set out in our Privacy Policy and Privacy Policy for California Residents and uses it for the purposes stated in that policy. If you decide that you want to be removed from our mailing lists at any time, you can change your contact preferences by clicking here. All contents are copyright of their authors. The gist of the code below is: The menu service is injected into the menu component. The handshake for dependencies should also be the same, since it's evaluated at runtime against the generated bundles (independent of anything mono-repo specific). Defining the lazy loaded module is almost done. Progress, Telerik, Ipswitch, Chef, Kemp, Flowmon and certain product names used herein are trademarks or registered trademarks of Progress Software Corporation and/or one of its subsidiaries or affiliates in the U.S. and/or other countries. The lazy loaded module have their own route file, so lazy loaded module can be defined in main routing file using "loadChildren" method. In Angular 8.0, the string based loadChildren method was deprecated so, we have to use LoadChildrenCallback method. Once the service is initialized, we populate the menu items. Authentication deals with routing and we need to allow our users to navigate to /authentication/login and get served the correct federated module for their company. Yes, it should be possible. Theyre built with Angular custom environment configurations, dynamic routes, and lazy-loading feature modules. We can start the app using one of the commands below. Thats because we have two portal apps living in the project, and both of them require a Home route. Shell shared configured with @angular/* singleton: true Dynamic module federation attempts to resolve this by allowing you independently request modules before bootstrapping Angular: We need the ability to have a decoupled shell, that can dynamically request federated modules at runtime. It can contain host views by instantiating a component with the createComponent() method. Do you know of any example that deals with the shell and mfes being in separate repos? Modernize how you debug your Angular apps - Start monitoring for free. You should be able to do this all manually, pointing your remote entry to whatever port your other repository/project is on. i.e. What would happen to the shared dependencies? Want to master Angular 14? This makes code sharing easy, and allows the common framework to be extracted into a shared module.

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After that, the function imports the GreetComponent using the import method. Angular app may have multiple modules based on the nature of the application. One solution is to create separate apps as different, discrete projects for each frontend. our feed for updates. Please note that doctorproduction is another environment configuration in our Angular.json file. As a bonus, we can use dynamic routes as the data source to generate menus. Instead of guessing why problems happen, you can aggregate and report on what state your application was in when an issue occurred. Each portal can have its own header/footer component and independent CSS styles. Theyre typically organized by domain area, and can be used to group the related components, services, and other functionalities together. __|- sub-feature2.module.ts, By exposing tha app.module.ts and app.component.ts I would only have 1 router-outlet and flat structure at remote app level: Each portal app can be built for their environment with the following command.

This can be any network call, for this demo we will use a local JSON asset called platform-config.json. Based on either your previous activity on our websites or our ongoing relationship, we will keep you updated on our products, solutions, services, company news and events. So we just add multi: true and remove ROUTES from the deps array will stop giving this error. To build and run the two portals separately, we rely on the environment configuration. The "app-routing.module" contains all the routes required in the application. This helps to keep the initial bundle size small, so the initial load time is decreased. components, directives, services, pipes and complete web, mobile, and desktop applications with latest Angular version. When you create a build of your application, you can see two different main.js files: one contains the root modules and another contains the feature component. Now that the foundation of module federation have been set, let's jump into dynamically swapping modules at runtime. Note: The routing module file should be automatically created by the CLI if you opted for automtically adding routing in your project, otherwise you need to create it manually and add the required code for setting up the router. You can also use service workers, DOM events and other messaging-based solutions to pass the needed context you would otherwise be using a token for. Once suspended, seanperkins will not be able to comment or publish posts until their suspension is removed.

The loadChildren method can specify with the string as well but this method was deprecated in Angular version 8. The AppModule should have a separate module of the cohesive functionality you are wanting to expose, i.e: LoginModule. Go ahead and create a admin/admin-routing.module.ts file and add the following code: We create the routes to the various components of our admin module and we include these routes in the admin routing module. See Trademarks for appropriate markings. There's a great walkthrough of this in the link at the top of this article. You can now locally run your shell and remote with: -o will automatically launch the apps in your default browser. The patient portal and doctor portal have different entry components, which serve as the container for the child components. To lazy load a component inside a particular location in the template, you can use ViewChild. Using the following code, we can add navigation to the app.component.html to load demo component. We can only lazy-load modules in Angular so let's generate a feature module using the Angular CLI 10: Next, we can also add a couple of components in our module: Angular provides the loadChildren property of a route's path to specify the module that needs to be lazy loaded when it's first navigated to. I acknowledge my data will be used in accordance with Progress' Privacy Policy and understand I may withdraw my consent at any time. Since import() returns a promise, its possible to use async/await instead of the then-based callback style. |- feature.module.ts I don't see any circular dependencies visually inspecting the code. Otherwise, you'll have to have that information in a config and pass static tokens into the app module of the shell and override the ROUTES token as shown above. _ |- feature2.module.ts. In the app-routing.module.ts. You might get the compilation error when you use dynamic import method. For example, lets say GreetComponent is using [(ngModel)] as shown in the next code listing: As ngModel is the part of FormsModule, when you use it inside a lazy-loaded component, Angular complains about that with error: Cant bind to ngModel since it isnt a known property of input. You can also ask us not to pass your Personal Information to third parties here: Do Not Sell My Info. Before we start, make sure your local environment has the following tools installed: Using the following Angular CLI command, we can create a new app skeleton. While they may require different UI styles or have unique features, they still share a lot of common functionalities. Instead of sharing tokens, you are likely better off using a service instance and sharing that between shell to remote. If you are using Angular CLI, create Angular App using "--routing" flag. Sometimes a lazy-loaded component relies on other modules. : your LoginModule has routing to go to a 2FA view or a ForgotMyPassword view? Thanks for any help you might be able to provide! A feature module has a root component that acts as the main view of the module.

This serves a purpose when your application wants to independently build and manage known features. 2022 C# Corner. Perhaps obviously, this approach will bloat the codebase, likely cause duplication, and leave you with code that is hard to maintain. Under the hood, all router modules roll-up the route definition to an injection token named ROUTES. Platform config is going to describe all the modules, the location of the modules, the module name to bootstrap and the route to register in the shell app for the remote module.

Subscribe to our Angular newsletter and get our hands-on Angular book for free! As a wrap-up, we've seen how to use the loadChildren property of a route in the Angular Router and the standard compliant dynamic import syntax to lazy load an example admin module. Some customers have "X" others have "Y". Hey, dev peeps: DevReach is back, face-to-face, and in Boston! The ViewContainerRef represents a container where one or more views can be attached. The above command creates Angular app with name "LazyLoadingTestApp" and here we have passed "--routing" flag, so "app-routing.module.ts" is also get generated that contains all routes. As a contrived example, we are going to build an e-health app with two frontends: As shown in the below diagram, the two portals expose different features, but are built on the same framework and share some common functionality. Are you sure you want to hide this comment?

_ |- feature1.module.ts Next, in the constructor of the parent component inject ViewContainerRef and ComponentFactoryResolver classes: As of the official documentation, ComponentFactoryResolver class is a simple registry that maps components to generated ComponentFactory classes that can be used to create an instance of the component using the create() method.
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