问题
I went through angular dynamically loading components. But i could not find how to remove the component dynamically.
My requirement is that the chat application loads dynamic component(image/graph/list/table) as per the conversation. But how can i destroy the component if the conversation moves forward.
I am trying to destroy dynamic component with external event.
Please help how to proceed.
EDIT: https://stackblitz.com/angular/emjkxxxdxmk?file=src%2Fapp%2Fad-banner.component.ts
I developed my code according to this example. Instead of time interval, I need to use a API call from a service that is subscribed another component(chat component).
Below API response can load the component.I am looking for how to destroy the already loaded component i use the API call again.
public sendMessage(data): void {
this.messages.push(this.message);
this.API.getResponse(data).subscribe(res => {
this.previousContext = res.context;
console.log('res', res);
if (res.result.type == 'table') {
this.DataService.setTrigger(new AdItem(Table2Component, res));
}
this.messages.push(
new Message(res.text, 'assets/images/bot.png', new Date(), 'chatbot')
);
});
this.message = new Message('', 'assets/images/user.png', this.message.timestamp, 'user');
}
回答1:
Use destroy() method
Destroys the component instance and all of the data structures associated with it.
ref:ComponentRef<any>;
loadComponent() {
this.currentAdIndex = (this.currentAdIndex + 1) % this.ads.length;
let adItem = this.ads[this.currentAdIndex];
let componentFactory = this.componentFactoryResolver.resolveComponentFactory(adItem.component);
let viewContainerRef = this.adHost.viewContainerRef;
viewContainerRef.clear();
let componentRef = viewContainerRef.createComponent(componentFactory);
this.ref=componentRef;
(<AdComponent>componentRef.instance).data = adItem.data;
}
removeComponent(){
try{
this.ref.destroy();
}
catch(e){
}
}
Example:https://stackblitz.com/edit/destroy?file=src/app/ad-banner.component.ts
来源:https://stackoverflow.com/questions/52354312/how-to-remove-a-component-dynamically-in-angular