Angular 5 : rearrange dynamically created components

Question

我使用 ComponentFactoryResolver 动态创建组件 shown in the docs .

// create a component each time this code is run
public buildComponent() {
  const factory = this.componentFactoryResolver.resolveComponentFactory(MyComponent);
  const componentRef = this.viewContainerRef.createComponent(factory);
  const component = componentRef.instance;

  this.componentArray.push(component);
}

这很好用。每次该函数运行时，都会创建一个新的 MyComponent 并将其添加到提供的 ViewContainerRef 位置的 DOM 中。现在，根据一些用户操作，我想重新排序组件。例如，我可能想将最后创建的组件在容器中向上移动一个位置。这可以在 Angular 中完成吗？

public moveComponentUp(component) {
  // What to do here?  The method could also be passed the componentRef
}

Answer 1

你可以有这样的方法:

move(shift: number, componentRef: ComponentRef<any>) {
  const currentIndex = this.vcRef.indexOf(componentRef.hostView);
  const len = this.vcRef.length;

  let destinationIndex = currentIndex + shift;
  if (destinationIndex === len) {
    destinationIndex = 0;
  }
  if (destinationIndex === -1) {
    destinationIndex = len - 1;
  }

  this.vcRef.move(componentRef.hostView, destinationIndex);
}

这将根据 shift 值移动组件:

move(1, componentRef) - up
move(-1, componentRef) - down 

Stackblitz example