我正在尝试设置一个标签系统,允许组件自行注册(带标题)。第一个标签就像一个收件箱,有大量的操作/链接项可供用户选择,每个点击都应该能够在点击时实例化一个新组件。动作/链接来自JSON。
然后,实例化的组件将自己注册为新选项卡。
我不确定这是不是最好的'进场? Sofar我见过的唯一指南是静态标签,这对我们没有帮助。
到目前为止,我只获得了主要引导程序的标签服务,以便在整个应用程序中保留,看起来就像这样。
export interface ITab { title: string; }
@Injectable()
export class TabsService {
private tabs = new Set<ITab>();
addTab(title: string): ITab {
let tab: ITab = { title };
this.tabs.add(tab);
return tab;
}
removeTab(tab: ITab) {
this.tabs.delete(tab);
}
}
问题:
DynamicComponentBuilder
吗?ng-content
,但我找不到有关如何使用它的更多信息编辑:尝试澄清
将收件箱视为邮件收件箱,将项目作为JSON提取并显示多个项目。单击其中一个项目后,将创建一个新选项卡,其中包含该项操作&#39;键入&#39;。那么类型就是一个组件
Edit2:图片
答案 0 :(得分:250)
的更新强>
<强>更新强>
ngComponentOutlet
已添加到4.0.0-beta.3
<强>更新强>
正在进行NgComponentOutlet
项工作,类似https://github.com/angular/angular/pull/11235
<强> RC.7 强>
// Helper component to add dynamic components
@Component({
selector: 'dcl-wrapper',
template: `<div #target></div>`
})
export class DclWrapper {
@ViewChild('target', {read: ViewContainerRef}) target: ViewContainerRef;
@Input() type: Type<Component>;
cmpRef: ComponentRef<Component>;
private isViewInitialized:boolean = false;
constructor(private componentFactoryResolver: ComponentFactoryResolver, private compiler: Compiler) {}
updateComponent() {
if(!this.isViewInitialized) {
return;
}
if(this.cmpRef) {
// when the `type` input changes we destroy a previously
// created component before creating the new one
this.cmpRef.destroy();
}
let factory = this.componentFactoryResolver.resolveComponentFactory(this.type);
this.cmpRef = this.target.createComponent(factory)
// to access the created instance use
// this.compRef.instance.someProperty = 'someValue';
// this.compRef.instance.someOutput.subscribe(val => doSomething());
}
ngOnChanges() {
this.updateComponent();
}
ngAfterViewInit() {
this.isViewInitialized = true;
this.updateComponent();
}
ngOnDestroy() {
if(this.cmpRef) {
this.cmpRef.destroy();
}
}
}
用法示例
// Use dcl-wrapper component
@Component({
selector: 'my-tabs',
template: `
<h2>Tabs</h2>
<div *ngFor="let tab of tabs">
<dcl-wrapper [type]="tab"></dcl-wrapper>
</div>
`
})
export class Tabs {
@Input() tabs;
}
@Component({
selector: 'my-app',
template: `
<h2>Hello {{name}}</h2>
<my-tabs [tabs]="types"></my-tabs>
`
})
export class App {
// The list of components to create tabs from
types = [C3, C1, C2, C3, C3, C1, C1];
}
@NgModule({
imports: [ BrowserModule ],
declarations: [ App, DclWrapper, Tabs, C1, C2, C3],
entryComponents: [C1, C2, C3],
bootstrap: [ App ]
})
export class AppModule {}
另见angular.io DYNAMIC COMPONENT LOADER
旧版本 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
这在Angular2 RC.5中再次发生了变化
我将更新以下示例,但它是休假前的最后一天。
这个Plunker example演示了如何在RC.5中动态创建组件
更新 - 使用ViewContainerRef。createComponent()
由于不推荐使用DynamicComponentLoader
,因此需要再次更新该方法。
@Component({
selector: 'dcl-wrapper',
template: `<div #target></div>`
})
export class DclWrapper {
@ViewChild('target', {read: ViewContainerRef}) target;
@Input() type;
cmpRef:ComponentRef;
private isViewInitialized:boolean = false;
constructor(private resolver: ComponentResolver) {}
updateComponent() {
if(!this.isViewInitialized) {
return;
}
if(this.cmpRef) {
this.cmpRef.destroy();
}
this.resolver.resolveComponent(this.type).then((factory:ComponentFactory<any>) => {
this.cmpRef = this.target.createComponent(factory)
// to access the created instance use
// this.compRef.instance.someProperty = 'someValue';
// this.compRef.instance.someOutput.subscribe(val => doSomething());
});
}
ngOnChanges() {
this.updateComponent();
}
ngAfterViewInit() {
this.isViewInitialized = true;
this.updateComponent();
}
ngOnDestroy() {
if(this.cmpRef) {
this.cmpRef.destroy();
}
}
}
Plunker example RC.4
Plunker example beta.17
更新 - 使用loadNextToLocation
export class DclWrapper {
@ViewChild('target', {read: ViewContainerRef}) target;
@Input() type;
cmpRef:ComponentRef;
private isViewInitialized:boolean = false;
constructor(private dcl:DynamicComponentLoader) {}
updateComponent() {
// should be executed every time `type` changes but not before `ngAfterViewInit()` was called
// to have `target` initialized
if(!this.isViewInitialized) {
return;
}
if(this.cmpRef) {
this.cmpRef.destroy();
}
this.dcl.loadNextToLocation(this.type, this.target).then((cmpRef) => {
this.cmpRef = cmpRef;
});
}
ngOnChanges() {
this.updateComponent();
}
ngAfterViewInit() {
this.isViewInitialized = true;
this.updateComponent();
}
ngOnDestroy() {
if(this.cmpRef) {
this.cmpRef.destroy();
}
}
}
<强>原始强>
从你的问题不完全确定你的要求是什么,但我认为这应该做你想要的。
Tabs
组件获取传递的类型数组,并创建&#34;标签&#34;对于数组中的每个项目。
@Component({
selector: 'dcl-wrapper',
template: `<div #target></div>`
})
export class DclWrapper {
constructor(private elRef:ElementRef, private dcl:DynamicComponentLoader) {}
@Input() type;
ngOnChanges() {
if(this.cmpRef) {
this.cmpRef.dispose();
}
this.dcl.loadIntoLocation(this.type, this.elRef, 'target').then((cmpRef) => {
this.cmpRef = cmpRef;
});
}
}
@Component({
selector: 'c1',
template: `<h2>c1</h2>`
})
export class C1 {
}
@Component({
selector: 'c2',
template: `<h2>c2</h2>`
})
export class C2 {
}
@Component({
selector: 'c3',
template: `<h2>c3</h2>`
})
export class C3 {
}
@Component({
selector: 'my-tabs',
directives: [DclWrapper],
template: `
<h2>Tabs</h2>
<div *ngFor="let tab of tabs">
<dcl-wrapper [type]="tab"></dcl-wrapper>
</div>
`
})
export class Tabs {
@Input() tabs;
}
@Component({
selector: 'my-app',
directives: [Tabs]
template: `
<h2>Hello {{name}}</h2>
<my-tabs [tabs]="types"></my-tabs>
`
})
export class App {
types = [C3, C1, C2, C3, C3, C1, C1];
}
Plunker example beta.15(不是基于你的Plunker)
还有一种传递数据的方法可以传递给动态创建的组件,如{someData
需要传递type
)
this.dcl.loadIntoLocation(this.type, this.elRef, 'target').then((cmpRef) => {
cmpRef.instance.someProperty = someData;
this.cmpRef = cmpRef;
});
还有一些支持使用依赖注入和共享服务。
有关详细信息,请参阅https://angular.io/docs/ts/latest/cookbook/dynamic-component-loader.html
答案 1 :(得分:18)
我评论不够酷。我从接受的答案修复了关于rc2工作的弹药。没有什么花哨的东西,与CDN的链接都被打破了。
from oauth2client import file
答案 2 :(得分:16)
有组件可以使用(rc5兼容)
ng2-steps
它使用Compiler
将组件注入步骤容器
和连接所有连接的服务(数据同步)
import { Directive , Input, OnInit, Compiler , ViewContainerRef } from '@angular/core';
import { StepsService } from './ng2-steps';
@Directive({
selector:'[ng2-step]'
})
export class StepDirective implements OnInit{
@Input('content') content:any;
@Input('index') index:string;
public instance;
constructor(
private compiler:Compiler,
private viewContainerRef:ViewContainerRef,
private sds:StepsService
){}
ngOnInit(){
//Magic!
this.compiler.compileComponentAsync(this.content).then((cmpFactory)=>{
const injector = this.viewContainerRef.injector;
this.viewContainerRef.createComponent(cmpFactory, 0, injector);
});
}
}