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我想選擇元素列表,以便在給定值的選項時將其中的一個關注。無法使用@ViewChildren獲取* ngFor循環的<md-option>元素
select.component.template:
<md-select
[formControl]="selectFormControl"
(click)="detectKeys()"
[required]="isRequired"
[disabled]="isDisabled"
[attr.role]="'listbox'"
[attr.aria-labelledby]="placeholder"
placeholder="placeholder">
<md-option #selectBox *ngFor="let option of options" [value]="option.value">
{{option.description}}
</md-option>
</md-select>
select.component.ts:
export class UiSelectComponent implements OnInit, AfterViewInit {
....
@Input() options: Object[];
@ViewChildren('selectBox') selects: QueryList<any>;
....
}
ngAfterViewInit() {
console.log(this.selects.length); // comes up empty results
}
就是這樣的。謝謝。最後一個問題:QueryList類型爲'',是嗎? –
kyw
@kyw在這裏是的,當涉及到'component'時,它會組件'Type' –