Now, we could write this.http = http to assign this parameter to a property of our class. And this constructor will take a property of type Http.Īngular will see this parameter when it's creating our ProjectsService instance, and it will match this Http class to the HttpModule that we imported into our app module, and it will inject an instance of that into the constructor. So instead of doing something like new Http() in here, what we'll do is create a constructor function. Now that we've imported that in both the necessary places, we can use dependency injection to inject this Http class into our ProjectsService. In our native modules at the top, I will import the HttpModule, and then down in our imports, let's include the HttpModule. So, let's go ahead and do that before we forget. And both of these come from we should also import the Http module into our app modules file. So let's import Http, and we will also import the response class which we will need for some type checking. This will allow us to make requests directly to the server. First of all we're going to need the Http module that Angular has. So let's go ahead and add some methods to our ProjectsService here. An Angular queue uses dependency injection in this way so that it can easily inject mock services and things like that if you want to test your components. As we'll see a bit later on, we use dependency injection to get an instance of this project service within a component that uses the project's service. Injectable makes this class something that Angular can use as dependency injection. So we'll just call Injectable, and then export our class. Now as I said, Injectable is a decorator, and it doesn't take any properties.
So let's import Injectable from angular/core. But there is another decorator that we need, and that is Injectable. Now of course a service is not a component, so there's no need to import the component decorator. So inside of our app directory, let's create a projects service. It's just an easy way to wrap up some functionality. In Angular, a service is basically any set of functionality that we want to be available to multiple components.
So in this video, we are going to create a project service. We want to have some way of getting a list of projects from our server. However, that's not a long-term solution. Right now, the projects that we are displaying to the user are just hard coded right into our projects component. Not setting the UUID can significantly impact your billing if your account uses the Monthly Active Users (MAUs) based pricing model, and can also lead to unexpected behavior if you have Presence enabled.In the course so far, we've been building a project management application. This UUID should be persisted, and should remain unchanged for the lifetime of the user or the device.
Angular2 app wrapper how to#
How to use the native PubNub JavaScript SDK Native PubNub JavaScript SDKĪlways set the UUID to uniquely identify the user or device that connects to PubNub. Then you will not need to register PubNub in any Angular Component hosted by the Angular Module. Using your ngModuleĪngular Module lets you to use the same instance of PubNub in all Angular Components declared in this. There are two ways to register PubNubAngular in your list of providers in your Angular App: ngModules or ngComponents. You can also use the native PubNub JavaScript SDK if you feel it is more suitable for your situation.
Support: Available to use with TypeScript or plain JavaScript.PubNub Angular2 is a wrapper for the PubNub JavaScript SDK v4 that adds a few extra features to simplify integration with Angular v2 and v4. Angular2 V4 complete API reference for building real-time applications on PubNub, including basic usage and sample code.
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