[Angular 2] Order Dynamic Components Inside an Angular 2 ViewContainer

By default, when you generate components, they will simply be added to the page in order, one after another. Angular 2 provides methods on the ViewContainer that allow you to reorder components once they’ve been created and provide the order that you want.

 

When you want to create a component and insert it at cetern position of the list. Then what you need to do is just pass in a second param, when you call 'createComponent()'.

 

import {Component, ViewChild, ViewContainerRef, ComponentFactoryResolver, Input} from '@angular/core';
import {SimpleService} from "../../serivces/simple.service";
import {WidgetThree} from "../widgets/widget-three.component";

@Component({
    moduleId: module.id,
    selector: 'home',
    templateUrl: 'home.component.html'
})
export class HomeComponent {

    @ViewChild('container', {
        read: ViewContainerRef
    }) container;

    constructor(private resolver: ComponentFactoryResolver, private simpleService: SimpleService) {
    }

    ngAfterContentInit(){
        const WidgetFactory = this.resolver.resolveComponentFactory(WidgetThree);
        this.container.createComponent(WidgetFactory);
        this.container.createComponent(WidgetFactory);
        this.container.createComponent(WidgetFactory);
        this.container.createComponent(WidgetFactory);
        const comRef = this.container.createComponent(WidgetFactory); // return a componentRef
        comRef.instance.message = "I am last"; // using componentRef's instance prop to access the component prop
        comRef.instance.renderer.setElementStyle(
            comRef.instance.input.nativeElement,
            'color',
            'red'
        )
    }

    onClick(){
        const WidgetFactory = this.resolver.resolveComponentFactory(WidgetThree);
        const comRef = this.container.createComponent(WidgetFactory, 2);
        comRef.instance.message = "I am third";
    }

}

So when click a button, we wil call 'onClick()' method, which will create a new component and insert it at the third place in the list.

转载于:https://www.cnblogs.com/Answer1215/p/5901368.html