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import {
ApplicationRef,
ComponentFactoryResolver,
ComponentRef,
EmbeddedViewRef,
Injectable,
Injector,
OnChanges,
SimpleChange,
SimpleChanges,
Type
} from '@angular/core'
@Injectable()
export class DynamicElementService {
constructor (
private injector: Injector,
private applicationRef: ApplicationRef,
private componentFactoryResolver: ComponentFactoryResolver
) { }
createElement <T> (ofComponent: Type<T>) {
const div = document.createElement('div')
const component = this.componentFactoryResolver.resolveComponentFactory(ofComponent)
.create(this.injector, [], div)
return component
}
injectElement <T> (wrapper: HTMLElement, componentRef: ComponentRef<T>) {
const hostView = componentRef.hostView as EmbeddedViewRef<any>
this.applicationRef.attachView(hostView)
wrapper.appendChild(hostView.rootNodes[0])
}
setModel <T> (componentRef: ComponentRef<T>, attributes: Partial<T>) {
const changes: SimpleChanges = {}
for (const key of Object.keys(attributes)) {
const previousValue = componentRef.instance[key]
const newValue = attributes[key]
componentRef.instance[key] = newValue
changes[key] = new SimpleChange(previousValue, newValue, previousValue === undefined)
}
const component = componentRef.instance
if (typeof (component as unknown as OnChanges).ngOnChanges === 'function') {
(component as unknown as OnChanges).ngOnChanges(changes)
}
componentRef.changeDetectorRef.detectChanges()
}
}
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