Loading Angular2 components dynamically from a module is a powerful feature that allows for greater

Within my Angular application, I have the following setup:

export class MyComponent {
    subcompPath = "path-to-subcomp#SubcompClassName";
    @ViewChild("placeholder", { read: ViewComponentRef }) placeholderRef: ViewComponentRef;

/* Constructor where Compiler, ComponentFactoryResolver are injected */

    loadSubcomponent() {
        let [path, componentName] = this.subcompPath.split("#");
        (<any>window).System.import(path)
            .then((module: any) => module[componentName])
            .then((type: any) => {
                return this._compiler.compileComponentAsync(type)
            })
            .then((factory: any) => {
                let componentRef = this.placeholderRef.createComponent(factory, 0);
            });
    }
}

My sub-component includes declarations for providers, directives, and pipes.

With the release of RC6, changes have been made that impact how components can declare directives and pipes. These must now be included in the module where the component is declared. Therefore, when loading with SystemJS, the emphasis should not be on loading the component itself but rather the module. Thus, the updated syntax using

return this._compiler.compileModuleAndAllComponentsAsync(type)
is essential. However, determining how to obtain a reference to the factory of the specific component remains a challenge. This factory is required by the placeholderRef.createComponent() method.

Despite efforts to explore the Angular 2 source code on GitHub, the task seems daunting due to its vast nature. Using tools like VS Code for enhanced intellisense could simplify this process, yet the lackluster documentation on angular.io poses another obstacle. The focus here is on lazy loading components and modules without relying on the router.

Any assistance or guidance on this matter would be greatly appreciated, as discovering the solution may prove simple to apply once found within official documentation.

Answer №1

Latest Update:

For seamless integration with ahead-of-time compilation, it is recommended to manually specify the Compiler as shown below:

export function createJitCompiler () {
   return new JitCompilerFactory([{useDebug: false, useJit: true}]).createCompiler();
}
...
providers: [
  { provide: Compiler, useFactory: createJitCompiler}
],

Check out this example for reference.

Previous version

If you find yourself struggling, consider this option:

this.compiler.compileModuleAndAllComponentsAsync(DynamicModule)
      .then(({moduleFactory, componentFactories}) => {
        const compFactory = componentFactories
           .find(x => x.componentType === DynamicComponent);
        const cmpRef = this.placeholderRef.createComponent(compFactory, 0);

Also, take a look at:

Answer №2

After reviewing yurzui's insights, I have refined the code snippet as follows:

export class MyComponent {
    subcompPath = "subcomponent-path-HERE#SubcompClassName";
    @ViewChild("placeholder", { read: ViewComponentRef }) placeholderRef: ViewComponentRef;

    /* Constructor where Compiler and ComponentFactoryResolver are injected */

    loadSubcomponent() {
        let [modulePath, componentName] = this.subcompPath.split("#");
        (<any>window).System.import(modulePath)
            .then((module: any) => module["default"])  // Can also include the module class name
            .then((type: any) => {
                return this._compiler.compileModuleAndAllComponentsAsync(type)
            })
            .then((moduleWithFactories: ModuleWithComponentFactories<any>) => {
                const factory = moduleWithFactories.componentFactories.find(x => x.componentType.name === componentName); // Important: componentType.name should be used here, not componentType!!
                let componentRef = this.placeholderRef.createComponent(factory, 0);
            });
    }
}

Similar questions

If you have not found the answer to your question or you are interested in this topic, then look at other similar questions below or use the search

How can Visual Studio assist in developing npm scoped modules?

I am new to nodejs/typescript/visual studio development and could use some guidance. I'm embarking on a new vs2015 solution to create multiple nodejs scoped modules. I have a few questions: What is the best way to organize my project folders? Is th ...

"Unlock the secret to effortlessly redirecting users to a designated page when they click the browser's back

So I'm facing the challenge of disabling the browser back button on multiple routes and sending requests to the backend is resulting in inconsistent behavior. I don't want to create a multitude of similar API requests each time. Currently, I have ...

How to trigger a click event in React using TypeScript and material-ui library

Currently, I am facing an issue when trying to update the value of material-ui TextFields from the store. When manually typing inside the field, everything works fine as expected with the handleChange() and handleBlur() functions handling the events. Howev ...

What is the equivalent of Typescript's Uint8Array and Uint16Array in Python?

new Uint8Array(new Uint16Array([64]).buffer) How can I achieve a similar data structure in pure Python? What is the equivalent of Uint8Array/Uint16Array? I am extracting a buffer from a Uint16Array type here and converting it to a Uint8Array, but I am un ...

Firebase Function deployment encountered an issue during the build phase, despite the predeploy process

My react.js project includes Firebase functions that are configured in a sub-folder called root/functions. These functions are written in typescript and have paths option set in tsconfig.json. In my functions/index.ts file, I import files from various loca ...

Moving the marker does not update the address

When the dragend event is triggered, the Getaddress function will be called in the following code: Getaddress(LastLat, LastLng , marker,source){ this.http.get('https://maps.googleapis.com/maps/api/geocode/json?latlng='+LastLat+ &apos ...

Transfer the data for 'keys' and 'input text' from *ngFor to the .ts file

I am facing difficulty in creating a string with dynamically generated keys from *ngFor and user input text. Let me provide some code to better explain my need. <th *ngFor="let column of Filter" > <tr>{{ column.name }}: <input type="{{c ...

Adding TypeScript types to an array within a function parameter: A step-by-step guide

Having some trouble defining the array type: The code below is functioning perfectly: const messageCustomStyles: Array<keyof IAlertMessage> = [ 'font', 'margin', 'padding' ]; r ...

Finding a way to reference multiple components within a mapping function

In order to set a ref to each project within the map function, I am trying to pass forwardRef from child to parent. At the moment, I am only able to get a single Project. However, I need to set refs to an array list so I can work with it. Below is what I h ...

[Simple TypeScript]: Assign the parameter value as the key of the object returned by the function

How do I modify the key of a function returned object to match its parameter's value? Here is my current code: const createCache = <A, T extends string>(name: T, base = {}) => { const cache = base; return { [name]: cache, } as { ...

"Utilizing an interceptor and retryWhen to automatically retry HTTP requests upon encountering a specific error

My service is set up to make a call to a GET API and then receive a response. I've integrated an HTTP Interceptor to effectively manage any errors that occur throughout the application. However, I have a specific requirement where if the API returns a ...

Authentication is needed when accessing ASP.NET Core 3.1 Angular with Windows. Please provide your username and

I am currently working with ASP.NET Core 3.1 and Angular. I am looking to integrate Windows authentication along with JWT for canActivate in Angular during routing, and also authorize the controller. However, I always get prompted for the Windows username ...

What is the Alternative for Angular2's $location.search() for Setting Query Parameters?

My website includes various filters that need to be reflected in the URL so that users can easily save and return to the current page by copying or bookmarking it. In Angular 1, I used $location.search(name, value) to update the search parameters easily. ...

Error encountered: popper.js throwing an unexpected token export SyntaxError

Error in Angular: When using popper.js with bootstrap 4, I'm encountering a SyntaxError with Unexpected token export. The error is showing up in the browser console. I tried changing the reference location for popper.min.js but it didn't work. ...

Paper-dropdown-menu component failing to render properly in web browser

Encountering an issue with the rendered HTML for a basic paper-dropdown-menu. Instead of displaying as a styled menu, the list items are just appearing as a plain list on the page. Upon clicking the rendered paper-input component within the dropdown, the ...

Having trouble with NPM install freezing during package installations?

Hello, I am currently facing an issue with my project. It works perfectly fine, but the problem arises when I try to move the project files (except node_modules) to another folder or GitHub. The reinstallation of packages via npm always gets stuck at: ex ...

Angular: Exploring Directives - The Impact of Passing "null" versus an Empty String to the @Input Setter

I've observed an interesting behavior with the @Input setter in a Directive. It seems that when an empty string ("") is passed in the template, the setter method is not initially called. However, if the value "null" or "false" is provided, then the se ...

Exploring ways to ensure robust typing for the body of NextApiRequest within a Next.js environment

Are you trying to figure out how to correctly define the body type of an API POST route in Next.js for better type safety? In NextApiRequest, the body is currently defined as "any" and NextApiRequest itself is not generic. I have tried forcefully assigni ...

Currently, I am utilizing Angular 2 to extract the name of a restaurant from a drop-down menu as soon as I input at least two characters

I am currently utilizing Angular 2 and I am trying to retrieve the names of all restaurants from a dropdown menu. Currently, when I click on the text field, it displays all the results, but I would like it to only show results after I have entered at least ...

The variable being declared at the class level inside a function within the same class is not recognized

Seeking guidance on the code snippet I'm currently studying. I am implementing a TypeScript 1.8.10 compiler along with EM5: module myAmazingModule{ 'use strict'; export interface INavigateService { links: string[], ...