You can use this angular service to spy scroll events from window or any other scrollable element.

This library implements two services. The ComponentDictionaryService can be used to add an entryComponent to the dictionary. You can also check if there exists a component with the given key. You have also the possibilty to override a component. For more information take a look directly to the service.

The second service ComponentService is used from the directive to create and remove dynamic components.

But the realy importend thing is the structural directive *lazyBind. With this directive you can bind the key, which you are used to register you component at the ComponentDictionaryService. And the second bind is a data bind, which is transfered to you component. Your dynamic component must only detect data or data and specialData changes.

See Examples here Example

Installation

First you need to install the npm module:

npm install @uniprank/ngx-lazy-bind --save

If you use SystemJS to load your files, you might have to update your config with this if you don't use defaultJSExtensions: true:

System.config({
    packages: {
        '@uniprank/ngx-lazy-bind': { defaultExtension: 'js' }
    }
});

Finally, you can use ngx-lazy-bind in your Angular project (NOT AngularJS). It is recommended to instantiate ComponentService and ComponentDictionaryService in the bootstrap of your application and to never add it to the "providers" property of your components, this way you will keep it as a singleton. If you add it to the "providers" property of a component it will instantiate a new instance of the service that won't be initialized.

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

import { LazyBindModule } from '@uniprank/ngx-lazy-bind';

@NgModule({
    imports: [BrowserModule, LazyBindModule.forRoot()],
    declarations: [AppComponent],
    bootstrap: [AppComponent]
})
export class AppModule {}

Using

Lazy Bind Directive

Use *lazyBind to render your dynamic EntryComponent.

import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';

import { LazyBindModule, ComponentDictionaryService } from 'ngx-lazy-bind';

import { TestExampleComponent } from './test-example.component';

@NgModule({
    declarations: [TestExampleComponent],
    imports: [CommonModule, LazyBindModule],
    entryComponents: [TestExampleComponent]
})
export class TestExampleModule {
    constructor(private _componentDictionaryService: ComponentDictionaryService) {
        _componentDictionaryService.add('TEC', TestExampleComponent);
    }
}

import { NgModule, Component, Injectable, AfterViewInit } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';

import { LazyBindModule } from '@uniprank/ngx-lazy-bind';

@Injectable()
@Component({
	selector: 'app',
	template: `<ng-container *lazyBind="'TEC'; data: {}"></ng-container>`
})
export class AppComponent {
	constructor() {}
}

@NgModule({
  imports: [
    BrowserModule,
    LazyBindModule.forRoot(),
    /* don't forget to include the Module-With-EntryComponent, it works also with lazy load modules */
    TestExampleModule
  ],
  declarations: [
  	AppComponent
  ],
  bootstrap: [ AppComponent ]
})

TODO:

• Finish unit tests

License

MIT