Angular2 beta中的DynamicComponentLoader：“元素没有组件指令
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我不能让angular的DynamicComponentLoader在beta.6中工作
我已经为动态组件加载from their docs采用了示例代码,并将其添加到plnkr,see here中的工作入门代码中. 这是代码： import {Component,DynamicComponentLoader,ElementRef} from 'angular2/core';
@Component({
selector: 'child-component',template: 'Child'
})
class ChildComponent {
}
@Component({
selector: 'my-app',template: '<h1>My First Angular 2 App</h1><div #child></div>'
})
export class AppComponent {
constructor(dcl: DynamicComponentLoader,elementRef: ElementRef) {
dcl.loadIntoLocation(ChildComponent,elementRef,'child');
}
}
这里是stacktrace,它说：“元素上没有组件指令”： EXCEPTION: Error during instantiation of AppComponent!.BrowserDomAdapter.logError @ angular2.dev.js:23083
angular2.dev.js:23083 ORIGINAL EXCEPTION: There is no component directive at element [object Object]BrowserDomAdapter.logError @ angular2.dev.js:23083
angular2.dev.js:23083 ORIGINAL STACKTRACE:BrowserDomAdapter.logError @ angular2.dev.js:23083
angular2.dev.js:23083 Error: There is no component directive at element [object Object]
at new BaseException (angular2.dev.js:7351)
at AppViewManager_.getNamedElementInComponentView (angular2.dev.js:6441)
at DynamicComponentLoader_.loadIntoLocation (angular2.dev.js:12375)
at new AppComponent (run.plnkr.co/mk31ybnwEtsiX31r/app/app.component.ts!transpiled:33)
at angular2.dev.js:1420
at Injector._instantiate (angular2.dev.js:11459)
at Injector._instantiateProvider (angular2.dev.js:11395)
at Injector._new (angular2.dev.js:11385)
at InjectorInlineStrategy.instantiateProvider (angular2.dev.js:11149)
at ElementDirectiveInlineStrategy.init (angular2.dev.js:9081)BrowserDomAdapter.logError @ angular2.dev.js:23083
angular2.dev.js:23083 ERROR CONTEXT:BrowserDomAdapter.logError @ angular2.dev.js:23083
angular2.dev.js:23083 _ContextcomponentElement: nullelement: my-appinjector: Injector__proto__: _ContextBrowserDomAdapter.logError @ angular2.dev.js:23083
angular2-polyfills.js:1152 DEPRECATION WARNING: 'dequeueTask' is no longer supported and will be removed in next major release. Use removeTask/removeRepeatingTask/removeMicroTask
更新4(和最后)
不推荐使用DynamicComponentLoader(参见commit).现在正确的方法是使用ViewContainerRef和ComponentResolver(请参阅下面的更新3)获取构造函数中的示例. 在beta.1中有一个突破性的变化.您无法再访问构造函数中的视图.因此,您可以将该示例移动到ngOnInit(),它将起作用. 引自changelog
export class AppComponent {
constructor(private dcl: DynamicComponentLoader,private elementRef: ElementRef) {
}
ngOnInit() {
this.dcl.loadIntoLocation(ChildComponent,this.elementRef,'child');
}
}
在您的示例工作时检查此plnkr. 更新 仅为了您的信息,我发送了一个PR(见#7186)来修复源代码中的示例.所以希望他们会审查它,它会通过. 更新2 自从beta.16 loadIntoLocation被删除后,错误不再可重现. loadNextToLocation现在采用ViewContainerRef.我开了一个新的PR(见#8241)来添加一个新的例子,其他一切都已经被原PR所覆盖. 代码示例(更新3) 如上所述,现在没有loadIntoLocation,但使用ViewContainerRef和ComponentResolver可以实现相同的行为. constructor(cmpResolver: ComponentResolver,viewContainer: ViewContainerRef) {
cmpResolver.resolveComponent(MyComponent)
.then((factory: ComponentFactory) => {
viewContainer.createComponent(factory,viewContainer.injector)
});
}
参考 > 关于loadNextToLocation,有两种方法,都使用ViewContainerRef. >从元素本身使用ViewContainerRef constructor(private dcl: DynamicComponentLoader,viewContainer: ViewContainerRef) {
dcl.loadNextToLocation(MyComponent,viewContainer).then(ref => {});
}
>在视图上使用一些元素 // Assume the next view
template : '<div #container></div>';
class MyClass {
@ViewChild('container',{read: ViewContainerRef}) container : ViewContainerRef;
constructor(private dcl: DynamicComponentLoader) {}
ngAfterViewInit() {
this.dcl.loadNextToLocation(MyDynamicCmp,this.container).then(ref => {});
}
}
上面的例子是plnkr. （编辑：李大同） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |