Browser Client

The @interopio/ng library provides modules and services for the io.Connect JavaScript libraries - @interopio/browser and @interopio/browser-platform, if you are working on an io.Connect Browser project, or @interopio/desktop, if you are working on an io.Connect Desktop project. The examples below use the @interopio/browser library. The @interopio/ng library allows you to start using io.Connect features in your Angular apps idiomatically in the context of the Angular framework.

This package should be used only in Angular apps. If you have created your app with the Angular CLI, then you don't need to take any additional steps. Otherwise, make sure to install the peer dependencies of @interopio/ng:

{
    "dependencies": {
        "@angular/common": "^9.1.3",
        "@angular/core": "^9.1.3",
        "rxjs": "^6.5.5",
        "tslib": "^1.10.0"
    }
}

⚠️ Note that @interopio/ng v4 supports Angular 14+, while @interopio/ng v3 supports Angular 7-15 (inclusive).

The following example assumes that your app was created with the Angular CLI. Install @interopio/ng:

npm install --save @interopio/ng

The @interopio/ng library exposes two important elements:

• IOConnectNg - an Angular module that initializes the @interopio/browser library;
• IOConnectStore - an Angular service that gives access to the io.Connect APIs;

IOConnectNg Module

The IOConnectNg module is responsible for initializing the @interopio/browser library. You must import the IOConnectNg module once for the entire app - in the root module by using the forRoot() method. This method accepts a settings object which has the following signature:

interface IOConnectNgSettings {
    holdInit?: boolean;
    browser?: {
        factory?: IOConnectBrowserFactoryFunction;
        config?: IOConnectBrowser.Config;
    };
    browserPlatform?: {
        factory?: IOConnectBrowserPlatformFactoryFunction;
        config?: IOConnectBrowserPlatform.Config;
    };
    desktop?: {
        factory?: IODesktopFactoryFunction;
        config?: IOConnectDesktop.Config;
    };
}

The following table describes the properties of the IOConnectNgSettings object:

⚠️ Note that you can't define a browser and browserPlatform property at the same time, but you can define one of them together with desktop. This is useful if you want your app to have different initialization characteristics in io.Connect Browser and io.Connect Desktop.

All properties are optional, but it's recommended that you provide the factory functions explicitly. If no factory functions are provided, the library will try to select the appropriate function injected in the global window object.

The initialization of the @interopio/browser library is asynchronous and therefore may take anywhere from a few milliseconds to a couple of seconds. There are two main situations in which setting holdInit to true (default) or false will benefit your project:

• holdInit: false - If the io.Connect functionalities play only a supporting role in your project, rather than being an essential part of it, it's recommended that you set holdInit to false. This way, your app won't have to wait for the io.Connect library to initialize in order to be able to function properly. You can use the IOConnectStore service to get notified when the @interopio/browser library is ready.

• holdInit: true - If the io.Connect functionalities are a critical part your project, then it's recommended to leave holdInit set to true. This way, Angular will wait for the io.Connect factory function to resolve before bootstrapping your first component. This will spare you the need to check whether the @interopio/browser library is available every time you want to use it in your app. As a negative result to this approach, when your users load the app, they will keep seeing a blank screen up until the first component has been bootstrapped. Of course, you can solve this by providing a loader animation as soon as your app is accessed.

The following example demonstrates how to initialize the @interopio/browser library:

import { IOConnectNg } from "@interopio/ng";
import IOBrowser from "@interopio/browser";

@NgModule({
    declarations: [
        AppComponent
    ],
    imports: [
        BrowserModule,
        IOConnectNg.forRoot({ browser: { factory: IOBrowser } })
    ],
    providers: [],
    bootstrap: [AppComponent]
})
export class AppModule { }

⚠️ Note that if the io.Connect initialization fails for any reason (invalid configuration, missing factory function, connection problems or initialization timeout), your app will still initialize.

IOConnectStore Service

The IOConnectStore service is used to obtain the io object which exposes the io.Connect API. This service can also notify you when the @interopio/browser library has been initialized and enables you to check for any initialization errors.

Example of creating an IOConnectStore service:

import { Injectable } from "@angular/core";
import { IOConnectStore } from "@interopio/ng";

@Injectable()
export class IOConnectService {
    constructor(private readonly ioConnectStore: IOConnectStore) { }
}

The IOConnectStore service offers the following methods:

You can now inject the service in the components that need it and access the io.Connect API from the object returned by this.ioConnectStore.getIOConnect(). This gives you a decent level of encapsulation and control. If you prefer handling async actions with Observables, then this service is the perfect place to wrap the methods you want to use in Observables.

The following examples demonstrate initializing and using the @interopio/ng library.

Initialization

Import the IOConnectNg module in the root module of your app and pass an io.Connect factory function:

import { BrowserModule } from "@angular/platform-browser";
import { NgModule } from "@angular/core";

import { AppComponent } from "./app.component";
import { IOConnectNg } from "@interopio/ng";
import IOBrowser from "@interopio/browser";

@NgModule({
    declarations: [
        AppComponent
    ],
    imports: [
        BrowserModule,
        IOConnectNg.forRoot({ browser: { factory: IOBrowser } })
    ],
    providers: [],
    bootstrap: [AppComponent]
})
export class AppModule { }

Consuming io.Connect APIs

Inject the IOConnectStore service in your component or service of choice in order to use the io.Connect API. It's recommended that you create your own Angular service that injects IOConnectStore and exposes only the functionality your app needs.

When initializing the @interopio/browser library with the IOConnectNg module, you can use the holdInit property (see IOConnectNg Module) to configure whether the Angular framework must wait for the io.Connect factory function to resolve before bootstrapping your first component. Depending on this setting, you can use the IOConnectStore service in different ways. The following examples demonstrate both cases:

• holdInit: true

Creating the service:

import { Injectable } from "@angular/core";
import { IOConnectStore } from "@interopio/ng";

@Injectable()
export class IOConnectService {

    constructor(private readonly ioConnectStore: IOConnectStore) { }

    public get ioConnectAvailable() {
        return !this.ioConnectStore.getInitError();
    }

    public registerMethod(name: string, callback: () => void): Promise<void> {
        if (!this.ioConnectAvailable) {
            return Promise.reject("io.Connect wasn't initialized.");
        }
        return this.ioConnectStore.getIOConnect().interop.register(name, callback);
    }
}

Using the service:

import { Component, OnInit } from "@angular/core";
import { IOConnectService } from "./my-io-connect-service";

@Component({
    selector: "app-root",
    templateUrl: "./app.component.html",
    styleUrls: ["./app.component.css"]
})
export class AppComponent implements OnInit {

    constructor(private ioConnectService: IOConnectService) { }

    public ngOnInit(): void {
        if (!this.ioConnectService.ioConnectAvailable) {
            // There has been an error during the io.Connect initialization.
            return;
        }
        // io.Connect has been initialized without errors and is ready to use.
    }
}

If you set holdInit to true (default), you can be sure that everywhere you inject the IOConnectStore service, the respective properties will be initialized and set. This is very convenient, because you don't have to subscribe and wait for an event in order to use the @interopio/browser library. However, you do need to always check if there is an initialization error by using this.ioConnectStore.getInitError(). If the io.Connect factory function throws an error, your app won't crash, but io.Connect won't be available and the value returned by getInitError() will be set to the respective error object during initialization.

• holdInit: false

Creating the service:

import { Injectable } from "@angular/core";
import { IOConnectStore } from "@interopio/ng";

@Injectable()
export class IOConnectService {

    constructor(private readonly ioConnectStore: IOConnectStore) { }

    public ready() {
        return this.ioConnectStore.ready;
    }

    public registerMethod(name: string, callback: () => void): Promise<void> {
        return this.ioConnectStore.getIOConnect().interop.register(name, callback);
    }
}

Using the service:

import { Component, OnInit } from "@angular/core";
import { IOConnectService } from "./my-io-connect-service";

@Component({
    selector: "app-root",
    templateUrl: "./app.component.html",
    styleUrls: ["./app.component.css"]
})
export class AppComponent implements OnInit {

    constructor(private ioConnectService: IOConnectService) { }

    public ngOnInit(): void {
        // Show the loader.
        this.ioConnectService
            .ready()
            .subscribe((ioConnectStatus) => {
                if (ioConnectStatus.error) {
                    // Hide the loader.
                    // io.Connect isn't available.
                    return;
                }
                // Hide the loader.
                // io.Connect is ready, continue with your logic.
            })
    }
}

As you can see, this approach requires a little bit more code, but it gives you an easy way to provide pleasant user experience while io.Connect is initializing, handle gracefully any initialization errors, and when the initialization resolves normally, you don't need to check the error object as in the previous example.