Question

我有ngFor循环，我需要用索引声明引用ID'＃'。例如

<button (click)="addRow()"></button>
<tr *ngFor="let data of datas; let i= index">
<td><ng-select #data{{i}} ></ng-select></td>
</tr>

addRow(){
// after selected data next row to focus.
}

并且我想专注于选择的下一行。

Answer 1

更新将子项视为输入或ng-select

输入后，您可以使用ViewChildren

<div *ngFor="let item of items">
      <input #data/>
</div>

@ViewChildren('data') data: QueryList<ElementRef>;
ngAfterViewInit()
{
    this.data.changes.subscribe(()=>{
       this.data.last.nativeElement.focus();
    })
}

如果我们有ng-select，则需要

<div *ngFor="let item of items">
   <ng-select #data .....>
   </ng-select> 
</div>

<!--see that the "QueryList" is a NgSelectComponent-->
@ViewChildren('data') data: QueryList<NgSelectComponent>;
ngAfterViewInit()
    {
        this.data.changes.subscribe(()=>{
          <!--we use filterInput.nativeElement-->
          this.data.last.filterInput.nativeElement.focus();
        })
    }

full stackblitz（在堆叠闪电中，我添加了一个“ takeWhile”以取消订阅ngOnDestroy元素中的更改）

Answer 2

尝试使用以下代码

<tr *ngFor="let dataObject of data; let i = index; trackBy:i;">
  <td><ng-select #data{{i}} ></ng-select></td>
</tr>

聚焦

import { Component, ElementRef, ViewChild, AfterViewInit} from '@angular/core';
... 

@ViewChild('data1') inputEl:ElementRef;

addRow() {
  setTimeout(() => this.inputEl.nativeElement.focus());
}

或

import Renderer2 from @angular/core into your component. Then:

const element = this.renderer.selectRootElement('#data1');

setTimeout(() => element.focus(), 0);

引用https://coderanch.com/t/675897/languages/programmatically-manage-focus-Angular-app

如何在ngFor中使用参考ID（＃）并获取下一个输入焦点？

2 个答案: