在我的组件中,我有一个通过@ContentChildren
收到的组件列表。现在我想在我的视图中渲染这些组件,但我仍然坚持如何这样做。我尝试了ng-container
和ng-content
,但我没有成功。我在考虑一些事情:
<component-renderer [component]="myComponent"></component-renderer>
但我没有找到任何提供此功能的东西。我整理了一个完整的(尽可能少的)示例来获取图片(也许我之前已经出错了一步?)。在组件中获取对这些组件的引用也很重要,因为它们都将实现我想要使用的特定接口:
MyInterface.ts
import { InjectionToken } from "@angular/core";
export const MyInterfaceToken = new InjectionToken<MyInterface>('MyInterfaceToken');
// This interface will be implemented by the "child" components.
export interface MyInterface {
doSomething(): void;
}
simple.component.ts
import { Component, OnInit, Input, forwardRef } from '@angular/core';
import { MyInterface, MyInterfaceToken } from '../MyInterface';
@Component({
selector: 'app-simple',
template: '<div>{{ value }}</div>',
providers: [{
provide: MyInterfaceToken, useExisting: SimpleComponent
}]
})
export class SimpleComponent implements MyInterface {
@Input() public value: string;
doSomething(): void {
alert(this.value);
}
}
多container.component.ts
import { Component, OnInit, Self, Inject, Optional, Directive, ContentChildren, AfterContentInit, QueryList } from '@angular/core';
import { MyInterface, MyInterfaceToken } from '../MyInterface';
// Directive to retreive the components, partially taken from:
// https://github.com/angular/angular/issues/8277
@Directive({ selector: '[multi-container-item]' })
export class MultiContainerItemDirective {
constructor(@Inject(MyInterfaceToken) @Self() @Optional() public component: MyInterface) {}
}
@Component({
selector: 'app-multi-container',
templateUrl: './multi-container.component.html'
})
export class MultiContainerComponent implements AfterContentInit {
@ContentChildren(MultiContainerItemDirective) public items: QueryList<MultiContainerItemDirective>;
public ngAfterContentInit() {
console.log(this.items); // Inspect in console => got both items.
this.items.first.component.doSomething(); // works.
}
public getComponents() {
return this.items.map(x => x.component);
}
}
用法示例
<app-multi-container>
<app-simple [value]="'Test1'" multi-container-item></app-simple>
<app-simple [value]="'Test2'" multi-container-item></app-simple>
</app-multi-container>
简短问题:我将多少容器的html放入项目中?类似的东西:
<div *ngFor="let component of getComponents()">
<component-renderer [component]="component"></component-renderer>
</div>
答案 0 :(得分:1)
您只需在MultiContainerComponent
组件中使用<div><ng-content select="[multi-container-item]"></ng-content></div>
:
using System;
{
class Program;
{
int a = 0;
int b = 0;
while ( a==6; b==6)
{
a = rollDice();
b = rollDice();
Console.WriteLine("{0} {1}",a,b);
}
}
}