viewchild

问题 I am newbie at Angular2. In my view I have few identical children that are generated in *ngFor. <ngb-panel *ngFor="let client of clients" [title]="'Client #' + client.id"> <template ngbPanelContent> <processing-item [client]="client"></processing-item> </template> </ngb-panel> I need to call methods of these components at parent element and find out the ViewChildren decorator and the code is: @ViewChildren(ProcessingItemComponent) processingItems: QueryList<ProcessingItemComponent>; Then I

问题 I am newbie at Angular2. In my view I have few identical children that are generated in *ngFor. <ngb-panel *ngFor="let client of clients" [title]="'Client #' + client.id"> <template ngbPanelContent> <processing-item [client]="client"></processing-item> </template> </ngb-panel> I need to call methods of these components at parent element and find out the ViewChildren decorator and the code is: @ViewChildren(ProcessingItemComponent) processingItems: QueryList<ProcessingItemComponent>; Then I

问题 I'using ng-container to iterate on a list and create components <ng-container *ngFor="let f of optionsList; let i = index;"> <!-- component--> <app-component #fieldcmp *ngIf="isAppComponent(f)" ></app-field> <!--another components--> <app-anoter-component1 *ngIf="isAnotherComponent1(f)"> </app-anoter-component1> ... <app-anoter-componentn *ngIf="isAnotherComponentn(f)"> </app-anoter-componentn> </ng-container> I would to list of References components inside ng-container. I tried to use

来源： https://stackoverflow.com/questions/51124039/child-to-parent-value-access-using-viewchild

来源： https://stackoverflow.com/questions/51124039/child-to-parent-value-access-using-viewchild

来源： https://stackoverflow.com/questions/56591546/ngx-datatable-custom-columns-with-action-buttons

来源： https://stackoverflow.com/questions/56591546/ngx-datatable-custom-columns-with-action-buttons

问题 I want to dynamically create a child component when the parent component is initialised, but when I tried to create it in ngAgterViewInit(), it throws the error that the ViewContainerRef is undefined. component.ts @ViewChild('container', {read: ViewContainerRef}) container: ViewContainerRef; constructor(private resolver: ComponentFactoryResolver) { } ngAfterViewInit(){ const factory = this.resolver.resolveComponentFactory(ChildComponent); this.container.createComponent(factory); //container

问题 I've a problem using @ViewChild with a component showed through ngIf. I found various solutions but no one usefull for me. This is my main component, consisting of various step (I showed only 2 in code for brevity) with a button for forward navigation and a button to reset the component returning on first step. First step is showed on page opening: ... <div class="my-container"> <first-child *ngIf="showFirtChild"></first-child> <second-child *ngIf="showSecondChild"></second-child> </div>

问题 What's the difference between ViewChild and ControlValueAccessor in Angular? Seems both of them can access child components, directives, DOM. So curious about the differences in usage, can one do something the other cannot do? 回答1: ControlValueAccesor is for making a custom form control . By steps, a FormControl can store anything, even an object. Imagine two different FormGroups form1=new FormGroup({ name:new FormControl('name') direcction:new FormControl({address:'address',cp:'cp'}) })