Angular2 – 将文本框聚焦在组件加载上

我正在Angular2(Beta 8)开发一个组件.该组件有一个文本框和一个下拉列表.一旦组件加载或更改下拉列表事件,我想在焦点放在文本框中.如何在角度2中实现这一点.以下是组件的Html.

<div>
    <form role="form" class="form-horizontal ">        
        <div [ngClass]="{showElement:IsEditMode,hidden:!IsEditMode}">
            <div class="form-group">
                <label class="control-label col-md-1 col-sm-1" for="name">Name</label>
                <div class="col-md-7 col-sm-7">
                    <input id="name" type="text" [(ngModel)]="person.Name" class="form-control" />

                </div>
                <div class="col-md-2 col-sm-2">
                    <input type="button" value="Add" (click)="AddPerson()" class="btn btn-primary" />
                </div>
            </div>
        </div>
        <div [ngClass]="{showElement:!IsEditMode,hidden:IsEditMode}">
            <div class="form-group">
                <label class="control-label col-md-1 col-sm-1" for="name">Person</label>
                <div class="col-md-7 col-sm-7">
                    <select [(ngModel)]="SelectedPerson.Id"  (change)="PersonSelected($event.target.value)" class="form-control">
                        <option *ngFor="#item of PeopleList" value="{{item.Id}}">{{item.Name}}</option>
                    </select>
                </div>
            </div>
        </div>        
    </form>
</div>

这个答案是灵感来自后 Angular 2: Focus on newly added input element

在cornerjs2中设置Html元素的重点的步骤

>在您的组件中导入ViewChildren

import { Input,Output,AfterContentInit,ContentChild,AfterViewInit,ViewChild,ViewChildren } from 'angular2/core';

>为要设置焦点的html声明本地模板变量名.
>实现函数ngAfterViewInit()或其他适当的生命周期钩子.
>以下是我用于设置焦点的代码片段

ngAfterViewInit() {vc.first.nativeElement.focus()}

///This is typescript
import {Component,Input,AfterViewChecked,ViewChildren} from 'angular2/core';

export class AppComponent implements AfterViewInit,AfterViewChecked { 
   @ViewChildren('input') vc;
  
   ngAfterViewInit() {            
        this.vc.first.nativeElement.focus();
    }
  
 }

<div>
    <form role="form" class="form-horizontal ">        
        <div [ngClass]="{showElement:IsEditMode,hidden:!IsEditMode}">
            <div class="form-group">
                <label class="control-label col-md-1 col-sm-1" for="name">Name</label>
                <div class="col-md-7 col-sm-7">
                    <input #input id="name" type="text" [(ngModel)]="person.Name" class="form-control" />

                </div>
                <div class="col-md-2 col-sm-2">
                    <input type="button" value="Add" (click)="AddPerson()" class="btn btn-primary" />
                </div>
            </div>
        </div>
        <div [ngClass]="{showElement:!IsEditMode,hidden:IsEditMode}">
            <div class="form-group">
                <label class="control-label col-md-1 col-sm-1" for="name">Person</label>
                <div class="col-md-7 col-sm-7">
                    <select [(ngModel)]="SelectedPerson.Id"  (change)="PersonSelected($event.target.value)" class="form-control">
                        <option *ngFor="#item of PeopleList" value="{{item.Id}}">{{item.Name}}</option>
                    </select>
                </div>
            </div>
        </div>        
    </form>
</div>

Angular2 – 将文本框聚焦在组件加载上

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