angular 16 动态生成组件
需求
在页面中生成一个确认弹窗
新的实现方式
第一步，获取需要的工具
@Injectable({
providedIn: 'root'
})
export class DialogService {
public containerRef: ViewContainerRef; //需要从Component中获取，然后传递进来
constructor(
private injector: Injector,
) { }
}12345678910
ViewContainerRef 的获取方式
-
第一种在
Component初始化时获取@Component({ selector: 'app-dialog-container', template: '', styles: [''], }) export class DialogContainerComponent { constructor( private service: DialogService, private viewContainerRef: ViewContainerRef, ) { this.service.containerRef = this.viewContainerRef; } }1234567891011121314
-
在
template中通过ng-container获取@Component({ selector: 'app-dialog-container', template: '<ng-container #modalVC></ng-container>', styles: [''], }) export class DialogContainerComponent implements AfterViewInit { @ViewChild('modalVC', {read: ViewContainerRef}) private viewContainerRef: ViewContainerRef; constructor( private service: DialogService, ) { } ngAfterViewInit(): void { this.service.containerRef = this.viewContainerRef; } }1234567891011121314151617181920
主要区别：就是增加的元素节点为兄弟节点，所以，第一种添加的弹窗是在外面的，不受 app-dialog-container 中的样式影响；第二种是作为子元素添加的，受样式影响
第二步，实现动态生成组件
component 为组件的类名
const dialogRef = this.containerRef.createComponent(component, {
injector: this.injector
});
// dialogRef.instance 就是组件的实例 12345
第三步，移除组件
如果需要在组件初始化，自动注入值或传值，则需要自定义 injector
import { InjectFlags, Injector, ProviderToken } from '@angular/core';
// 这个类是传值的载体
export class DialogPackage<T = any> {
constructor(
public data: T,
public dialogId: any,
) {
}
}
// 这是自定义的注射器
export class DialogInjector<T> implements Injector {
constructor(
private data: DialogPackage,
private parentInjector: Injector
) {}
get<T>(token: ProviderToken<T>, notFoundValue?: T, option?: InjectOptions): T;
get(token: any, notFoundValue?: any);
get(token: any, notFoundValue?: any, flags?: any): any {
if (token === DialogPackage) {
return this.data;
}
return this.parentInjector.get<T>(token, notFoundValue, flags);
}
}1234567891011121314151617181920212223242526272829
则第二步需要修改
const dialogInjector = new DialogInjector(new DialogPackage(option, dialogId), this.injector);
const dialogRef = this.containerRef.createComponent(component, {
injector: dialogInjector
});
// dialogRef.instance 就是组件的实例 123456
在组件中接收值
export class DialogConfirmComponent {
constructor(
private data: DialogPackage<DialogConfirmOption>,
private service: DialogService,
) {
}
}123456789
过时实现代码
第一步，获取需要的工具
export class DialogService {
constructor(
private resolver: ComponentFactoryResolver,
private applicationRef: ApplicationRef,
private injector: Injector,
@Inject(DOCUMENT) private document: Document,
) { }
}1234567891011
第二步，实现动态生成组件
component 为组件的类名
const dialogFactory = this.resolver.resolveComponentFactory(component);
const dialogRef = dialogFactory.create(this.injector);
// 正式添加到程序和添加到页面上，才能显示
this.applicationRef.attachView(dialogRef.hostView);
this.document.body.appendChild(dialogRef.location.nativeElement);
// dialogRef.instance 就是组件的实例 1234567
第三步，移除组件
this.applicationRef.detachView(dialogRef.hostView);
this.document.body.removeChild(dialogRef.location.nativeElement);12
如果需要在组件初始化，自动注入值或传值，则需要自定义 injector
import { InjectFlags, Injector, ProviderToken } from '@angular/core';
// 这个类是传值的载体
export class DialogPackage<T = any> {
constructor(
public data: T,
public dialogId: any,
) {
}
}
// 这是自定义的注射器
export class DialogInjector<T> implements Injector {
constructor(
private data: DialogPackage,
private parentInjector: Injector
) {}
get<T>(token: ProviderToken<T>, notFoundValue?: T, flags?: InjectFlags): T;
get(token: any, notFoundValue?: any);
get(token: any, notFoundValue?: any, flags?: any): any {
if (token === DialogPackage) {
return this.data;
}
return this.parentInjector.get<T>(token, notFoundValue, flags);
}
}1234567891011121314151617181920212223242526272829
则第二步需要修改
const dialogFactory = this.resolver.resolveComponentFactory(component);
// 这里的option 可以是任何值
const dialogInjector = new DialogInjector(new DialogPackage(option, dialogId), this.injector);
const dialogRef = dialogFactory.create(dialogInjector);
// 正式添加到程序和添加到页面上，才能显示
this.applicationRef.attachView(dialogRef.hostView);
this.document.body.appendChild(dialogRef.location.nativeElement);
// dialogRef.instance 就是组件的实例 123456789
在组件中接收值
export class DialogConfirmComponent {
constructor(
private data: DialogPackage<DialogConfirmOption>,
private service: DialogService,
) {
}
}123456789
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