When calling dispose, we permanently remove the portalOutlet from DOM. This will inject the portal into the placeholder referenced by the portalOutlet. Lets walk through an example of using Portal step-by-step. As a result, the corresponding component will be loaded into the router outlet. What drives the appeal and nostalgia of Margaret Thatcher within UK Conservative Party? This is achieves the same end result as declaring the dependency in @ngModule.providers. 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. Please note i have commented many part of the code so that we focus on the main answer. 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. How can I convert a string to boolean in JavaScript? Do weekend days count as part of a vacation?
From time to time, we will need to inject a component or UI template into another component dynamically. I'm guessing it can be done in a component too: https://angular.io/docs/ts/latest/api/http/Http-class.html. OP asks to add dependencies on a component level. I am a full-stack developer. 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. They do not contain logic about clients or orders; instead, they only need to focus on rendering the content correctly. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Love coding, learning, and writing. 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. They can still re-publish the post if they are not suspended. Our HelloComponent takes a configuration constructor injected object.
Was there a Russian safe haven city for politicians and scientists? Trending is based off of the highest score sort and falls back to it if no posts are trending. So if you provide "1" then you get something and if you provide "2" you get something. I hope this article can help you to apply this technique in your own awesome app! Another way is to use the dispose method. How to help my players track gold in multiple currencies? 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. In the following example, the action component content is updated when the observable value changes. `, Angular Router: empty paths, named outlets and a fix that came with Angular 11, Angular Router: Getting to know UrlTree, ActivatedRouteSnapshot and ActivatedRoute. Why do the displayed ticks from a Plot of a function not match the ones extracted through Charting`FindTicks in this case? We have a few options to create a portal.
We're using Injector.create() to create a custom injector for the tab components. Now, this.fooToken's value will depend on the returned value from this.getMessageOfCurrentTab(). Time between connecting flights in Norway. You can now choose to sort by Trending, which boosts votes that have happened recently, helping to surface more up-to-date answers. var functionName = function() {} vs function functionName() {}. If you want to see detailed step refer this Angular tutorial, Step 1 :- Create the collection of the providers. In the ActionComponent, we created a placeholder with the ID set to action. Thanks for contributing an answer to Stack Overflow! For further actions, you may consider blocking this person and/or reporting abuse. Instead of guessing why problems happen, you can aggregate and report on what state your application was in when an issue occurred. What we want is to inject UI contents into the subcomponents while the subcomponents dont know where the contents are coming from. Made with love and Ruby on Rails. In this case, both the client and order components can project content into ActionButtonComponent. Those contents are shown in the portalOutlet in ActionComponent. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. All of the dependencies resolved are in the scope of mainModule. I share for whom concern. Then in the app.module.ts file, we need to import the CDK module. The coupling between the host and injected component makes it hard to test and maintain. We use the detach method to remove the previously attached portal from the portalOutlet. How to update a value provided by a provider in Angular? Upon the selection change, the selected service type data is pushed into the serviceType$ observable in the DashboardService. Instead, the current design makes them aware of the external data entities. Can a human colony be self-sustaining without sunlight using mushrooms? Portals are provided as part of the Angular Material CDK, which is internally developed by the Angular Material team. Is there a way to specify providers dynamically from, say, constructor of the component? Once unpublished, this post will become invisible to the public Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide.
Imagine you are in a situation the requires you to work with complex views(host views, embedded views). Below are 3 broader steps you need to follow to implement dynamic providers. 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. Please note that the DomPortalOutlet was previously called DomPortalHost. This means that they register event handling, which makes them hard to be reused. The screen contains. Get injector object in the constructor using DI and you can then look up using the "Get" method and the token. 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. 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. There are two key parts: Lets make use of the portals to solve the above problem. Lets say were enhancing the dashboard screen in an Angular app. Templates let you quickly answer FAQs or store snippets for re-use. Why had climate change not been proven beyond doubt for so long? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. and only accessible to Andrei Gatej. To start using the Angular CDK portal, the following package needs to be installed. Please note that the element with the cdkPortal directive will not be shown until its attached to CdkPortalOutlet. Step 3 :- Get the Injector object in constructor. However, now you want to change this behavior, maybe you want to alter the FooToken's value depending on a certain action. In Angular, there are a couple of ways to render dynamic components into a host component before the CDK portals are released. What would the ancient Romans have called Hercules' Club? In the action component, we subscribe to the serviceType$ observable. With DomPortal, the Angular binding within the content wont be effective because its treated as a native DOM element. Here is an overview of how the portal and portalOutlet work together. How to get provider data before Angular application startup, Injection Token Not Resetting on Component Change. The creation of DomPortalOutlet occurs within the ngAfterViewInit lifecycle event. How to add providers to Injector dynamically? In our example, we use the detach method, as our intention is to detach the portal instead of removing the portalOutlet from DOM. When the user picks an option from the selector, the app will navigate to different subroutes. Asking for help, clarification, or responding to other answers. I used useFactory to determine what class will be used for provide. Since Angular 9, its been renamed to DomPortalOutlet. To pass context data in templatePortal, we can use the context property. But for other use cases, you may need to pass contextual data into the portal. 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? Create the collection and you can use the push method to add DI objects dynamically. What are the "disks" seen on the walls of some NASA space shuttles? How can I use parentheses when there are math parentheses inside? How does a tailplane provide downforce if it has the same AoA as the main wing? DEV Community A constructive and inclusive social network for software developers. This is not dynamic provider this is just delayed injection using Injector. What's the difference between a magic wand and a spell. ng-content is used so we can project contents from the other components. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. After both portal and DomPortalOutlet are defined, we can attach the portal to the portalOutlet. In the US, how do we make tax withholding less if we lost our job for a few months? Once unsuspended, anduser96 will be able to comment and publish posts again. DEV Community 2016 - 2022. rev2022.7.21.42639. As an Angular developer, a large part of our daily job is putting components together to build our app. What happens if I accidentally ground the output of an LDO regulator? Data Imbalance: what would be an ideal number(ratio) of newly added class's data? These are: Both methods have a drawback: the host component needs to reference the injected component directly. Use the the imperative / programmatic way of performing constructor injection ReflectiveInjector to resolve and create the configuration for the component. Once suspended, anduser96 will not be able to comment or publish posts until their suspension is removed. In this article, we discussed how to use Angular CDK portals to inject dynamic contents to a few components in a dashboard. Now we can create the DomPortalOutlet. This doesn't seem to work now that 2.0.0 is released. Below is what the final result looks like. nicely done.. this is similar as angular material does for dialog box components.. Are you sure you want to hide this comment? In this example, we use the cdkPortal directive because its simpler and more declarative. How can I remove a specific item from an array? How can I merge properties of two JavaScript objects dynamically? In the previous example, we dont need to pass data because ng-content is used to project contents. Step 2 :- Provide the providers collection in "NgModule" . Portal provides a flexible and clean alternative method of injecting content into an Angular component. The CDK Portal is a powerful feature. The cdkPortal directive saves some boilerplate code compared to TemplatePortal, as we dont need to manually instantiate the portal. In the ActionButtonComponent class, we can reference the template using the @ViewChild and CdkPortal directives. Each component can specify new Providers using its providers property in ComponentMetadata. For ComponentPortal, we can use token injection shown in the code below.
Our dashboard shows dynamic content when the dropdown selector changes. ` Announcing the Stacks Editor Beta release! A similar example can be found in my dependency-injection-playground. We use ngSwitch to react to the observable serviceType$. The rest of the parameters are injected via the component constructor. How to check whether a string contains a substring in JavaScript? Built on Forem the open source software that powers DEV and other inclusive communities. "Selected/commanded," "indicated," what's the third word? 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. Its to clean things up when the parent component is removed. We use document.querySelector to get hold of the DOM element placeholder defined above. As the below code shows, we wrap ng-content inside the ng-template in the ActionButtonComponent template. To learn more, see our tips on writing great answers. The two subcomponents will then be updated with different content. It gives us the ability to teleport content to any component within the screen, even if its outside the current component tree. You mean you want to change the injector from within the component in some event click or some other place. Its necessary because ngAfterViewInit occurs right after the view is rendered. Of course, this example is rather trivial, but I think knowing such things can come in handy in certain situations. Making statements based on opinion; back them up with references or personal experience. Imagine you have multiple tabs and you would like to dynamically display some content, depending on which tab is active. How do I check if an element is hidden in jQuery? Design patterns for asynchronous API communication. setup loops; never enters loop - restarting? Its major benefits include its flexibility and clean separations. You make it dynamic by adding decisions into the factory function instead of just returning the same object. You can read more about ViewContainerRef's API here. This applies to all elements, including div. There are two equivalent selectors for the cdkPortal directive: portal or cdk-portal. 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. If anduser96 is not suspended, they can still re-publish their posts from their dashboard. As you can see, this.fooToken will be the value defined in AppModule's injector: { message: 'default foo value' }. What is the JavaScript version of sleep()?