`, Angular Router: empty paths, named outlets and a fix that came with Angular 11, Angular Router: Getting to know UrlTree, ActivatedRouteSnapshot and ActivatedRoute. How does a tailplane provide downforce if it has the same AoA as the main wing? Of course, this example is rather trivial, but I think knowing such things can come in handy in certain situations. Each component can specify new Providers using its providers property in ComponentMetadata. Lets walk through an example of using Portal step-by-step.
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setup loops; never enters loop - restarting? How can I merge properties of two JavaScript objects dynamically? What happens if I accidentally ground the output of an LDO regulator? I'm guessing it can be done in a component too: https://angular.io/docs/ts/latest/api/http/Http-class.html. The creation of DomPortalOutlet occurs within the ngAfterViewInit lifecycle event. Imagine you have multiple tabs and you would like to dynamically display some content, depending on which tab is active. They can still re-publish the post if they are not suspended. In the ActionButtonComponent class, we can reference the template using the @ViewChild and CdkPortal directives. nicely done.. this is similar as angular material does for dialog box components.. Are you sure you want to hide this comment?
The cdkPortal directive saves some boilerplate code compared to TemplatePortal, as we dont need to manually instantiate the portal. Asking for help, clarification, or responding to other answers. However, now you want to change this behavior, maybe you want to alter the FooToken's value depending on a certain action. In this article, we discussed how to use Angular CDK portals to inject dynamic contents to a few components in a dashboard. In our example, we use the detach method, as our intention is to detach the portal instead of removing the portalOutlet from DOM. To learn more, see our tips on writing great answers. To pass context data in templatePortal, we can use the context property. How to add providers to Injector dynamically? As the below code shows, we wrap ng-content inside the ng-template in the ActionButtonComponent template. 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. As a result, the corresponding component will be loaded into the router outlet. What's the difference between a magic wand and a spell. We're using Injector.create() to create a custom injector for the tab components. In the US, how do we make tax withholding less if we lost our job for a few months? Below is what the final result looks like. Now, this.fooToken's value will depend on the returned value from this.getMessageOfCurrentTab(). Time between connecting flights in Norway. How should I deal with coworkers not respecting my blocking off time in my calendar for work? We use the detach method to remove the previously attached portal from the portalOutlet. I've been up against it trying to get this working. Find centralized, trusted content and collaborate around the technologies you use most. There are two key parts: Lets make use of the portals to solve the above problem. The rest of the parameters are injected via the component constructor. Why do the displayed ticks from a Plot of a function not match the ones extracted through Charting`FindTicks in this case? How can I convert a string to boolean in JavaScript? Modernize how you debug your Angular apps - Start monitoring for free. to optimize your application's performance, React Tracked: Manage state and prevent excessive re-rendering, Building a type-safe dictionary in TypeScript, Using React Native ScrollView to create a sticky header, Fleet: A build tool for improving Rusts Cargo, A dropdown selector: the change of selection will change the context of the dashboard, A router outlet: this is used to load the components from subroutes. Best of all, the subcomponents (the stats and action components) are loosely coupled. Step 2 :- Provide the providers collection in "NgModule" . Can a human colony be self-sustaining without sunlight using mushrooms? In the ActionComponent, we created a placeholder with the ID set to action. In the previous example, we dont need to pass data because ng-content is used to project contents. Making statements based on opinion; back them up with references or personal experience. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. How can I remove a specific item from an array? DEV Community 2016 - 2022. This will inject the portal into the placeholder referenced by the portalOutlet. It gives us the ability to teleport content to any component within the screen, even if its outside the current component tree. Instead of guessing why problems happen, you can aggregate and report on what state your application was in when an issue occurred. Imagine you are in a situation the requires you to work with complex views(host views, embedded views). This means that they register event handling, which makes them hard to be reused. Portal provides a flexible and clean alternative method of injecting content into an Angular component. They do not contain logic about clients or orders; instead, they only need to focus on rendering the content correctly. Made with love and Ruby on Rails. Templates let you quickly answer FAQs or store snippets for re-use. I share for whom concern. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Trending is based off of the highest score sort and falls back to it if no posts are trending. In Angular, there are a couple of ways to render dynamic components into a host component before the CDK portals are released. Connect and share knowledge within a single location that is structured and easy to search. Built on Forem the open source software that powers DEV and other inclusive communities. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. We use ngSwitch to react to the observable serviceType$.
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Data Imbalance: what would be an ideal number(ratio) of newly added class's data? The two subcomponents will then be updated with different content. After both portal and DomPortalOutlet are defined, we can attach the portal to the portalOutlet. Thanks for contributing an answer to Stack Overflow! A similar example can be found in my dependency-injection-playground. How to check whether a string contains a substring in JavaScript? I hope this article can help you to apply this technique in your own awesome app! The reason we to do this to keep Angular from yelling at us about the object not being constructed properly, even if if the property is initialized post construction ( this.componentRef.instance.config = value;` ) Yes Angular is also your mom. When the user picks an option from the selector, the app will navigate to different subroutes. How can I use parentheses when there are math parentheses inside? The screen contains. So if you provide "1" then you get something and if you provide "2" you get something. Our HelloComponent takes a configuration constructor injected object. Upon the selection change, the selected service type data is pushed into the serviceType$ observable in the DashboardService. For ComponentPortal, we can use token injection shown in the code below. What we want is to inject UI contents into the subcomponents while the subcomponents dont know where the contents are coming from. This is achieves the same end result as declaring the dependency in @ngModule.providers.
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In this example, we use the cdkPortal directive because its simpler and more declarative. How to help my players track gold in multiple currencies? The dashboard works, but there are a couple of problems with the code: These subcomponents are designed to present data, so they should be dumb, or presentational, components. Once unpublished, this post will become invisible to the public Then in the app.module.ts file, we need to import the CDK module. I used useFactory to determine what class will be used for provide. With you every step of your journey. Instead, the current design makes them aware of the external data entities. You mean you want to change the injector from within the component in some event click or some other place. Portals are provided as part of the Angular Material CDK, which is internally developed by the Angular Material team. Get injector object in the constructor using DI and you can then look up using the "Get" method and the token. There are two equivalent selectors for the cdkPortal directive: portal or cdk-portal. As you can see, this.fooToken will be the value defined in AppModule's injector: { message: 'default foo value' }. These are: Both methods have a drawback: the host component needs to reference the injected component directly. OP asks to add dependencies on a component level.
What drives the appeal and nostalgia of Margaret Thatcher within UK Conservative Party? There is one way to create component using ViewContainerRef, where is allowed to pass injector so I guess this should be possible but it is limited to create components dynamically: Or similarly use Portal from Angular CDK. Love coding, learning, and writing. If anduser96 is not suspended, they can still re-publish their posts from their dashboard. In the action component, we subscribe to the serviceType$ observable. Do weekend days count as part of a vacation? Now we can create the DomPortalOutlet. Please note that the element with the cdkPortal directive will not be shown until its attached to CdkPortalOutlet. How do I check if an array includes a value in JavaScript? The definition of portals in the official documentation is: portal is a piece of UI that can be dynamically rendered to an open slot on the page. You can find the full example code on my GitHub. You can now choose to sort by Trending, which boosts votes that have happened recently, helping to surface more up-to-date answers. yeah, say you have an user input and you want to use that input to set up a provider so that it's available to components instantiated later. Once suspended, anduser96 will not be able to comment or publish posts until their suspension is removed. The LogRocket NgRx plugin logs Angular state and actions to the LogRocket console, giving you context around what led to an error, and what state the application was in when an issue occurred. When creating this component dynamically we wish to inject that component with the configuration value using Angular Dependency Injection, but without configuring the @ngModule.providers providers array or using providedIn:root. What is the JavaScript version of sleep()? and only accessible to Andrei Gatej. When calling dispose, we permanently remove the portalOutlet from DOM. If you want to see detailed step refer this Angular tutorial, Step 1 :- Create the collection of the providers. The coupling between the host and injected component makes it hard to test and maintain. You make it dynamic by adding decisions into the factory function instead of just returning the same object.
But for other use cases, you may need to pass contextual data into the portal. Design patterns for asynchronous API communication. Since Angular 9, its been renamed to DomPortalOutlet. Our dashboard shows dynamic content when the dropdown selector changes. In the following example, the action component content is updated when the observable value changes. var functionName = function() {} vs function functionName() {}. As an Angular developer, a large part of our daily job is putting components together to build our app. As if it wasn't enoughyou might also want to change these views' parent injector at runtime. Step 3 :- Get the Injector object in constructor. It will become hidden in your post, but will still be visible via the comment's permalink. The CDK Portal is a powerful feature. Please note i have commented many part of the code so that we focus on the main answer. Why had climate change not been proven beyond doubt for so long? Angular CDK also provides a cdkPortal directive, which is a version of TemplatePortal. In the twin paradox or twins paradox what do the clocks of the twin and the distant star he visits show when he's at the star? ` All of the dependencies resolved are in the scope of mainModule. This applies to all elements, including div. What are the "disks" seen on the walls of some NASA space shuttles? We use document.querySelector to get hold of the DOM element placeholder defined above. Now, in this case, each tab will have its own component that will make use of the value provided by FooToken and this value can result from other condition. Once unsuspended, anduser96 will be able to comment and publish posts again.
Use the the imperative / programmatic way of performing constructor injection ReflectiveInjector to resolve and create the configuration for the component. ng-content is used so we can project contents from the other components. What would the ancient Romans have called Hercules' Club? Its to clean things up when the parent component is removed.
Is there a way to specify providers dynamically from, say, constructor of the component? You can read more about ViewContainerRef's API here. DEV Community A constructive and inclusive social network for software developers.
We have a few options to create a portal.
Lets say were enhancing the dashboard screen in an Angular app. To add a new service type, we need to add ngSwitchCase into all of our subcomponents, and with more service types or subcomponents being added, the dashboard will become more complex and harder to maintain. How to get provider data before Angular application startup, Injection Token Not Resetting on Component Change. Its major benefits include its flexibility and clean separations. This is not dynamic provider this is just delayed injection using Injector.
To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Please note that the DomPortalOutlet was previously called DomPortalHost. Announcing the Stacks Editor Beta release! Here is an overview of how the portal and portalOutlet work together. With DomPortal, the Angular binding within the content wont be effective because its treated as a native DOM element. Those contents are shown in the portalOutlet in ActionComponent.