我正在尝试自动从< mat-autocomplete ...>中的选项集中选择第一个值.
export class ExampleComponent implements OnInit,AfterViewInit {
@ViewChildren('auto') matAutocomplete: QueryList<any>;
constructor(private cdr: ChangeDetectorRef) { }
ngAfterViewInit() {
this.foundItemsList.changes.subscribe(options => {
// ---> This simply works!
setTimeout(() => this.matAutocomplete.first._keyManager.setFirstItemActive(),0);
// ---> This doesn't works?! No error shown,it just seems that the above function isn't called at all.
this.matAutocomplete.first._keyManager.setFirstItemActive()
this.cdr.detectChanges();
});
}
https://github.com/angular/material2/blob/master/src/lib/autocomplete/autocomplete.ts
AFAIK,detectChanges做的是检查当前组件及其所有子组件的变化检测器,对吗？但似乎它在上面的场景中不起作用.
