Angular 4获取Select控件的Selected选项文本

Question

我想在Angular 4中获取Select控件的选择文本选项.

HTML:

<div class="col-sm-6 form-group">
<label>Industry</label>
<select   class="form-control select"  formControlName="Industry">
<option value="">Please select Value</option>  
<option *ngFor="let industry of industries"  
[ngValue]="industry.ID">{{industry.Name}}  
</option>  
</select> 
</div>


upload.component.ts
this.form.controls['Industry'].valueChanges.subscribe((name) => {
                this.form.controls['IndustryName'].setValue(name);
  });

我正在使用Reactive的formControlName属性.

请建议回顾选定文本选择控件

Answer 1

实现这一目标的最简单方法是:从HTML获取id,使用id值引发事件,然后在集合中搜索该项.

HTML

<select class="form-control" [(ngModel)]="selectedStatusId" (change)="setSelectedStatus(selectedStatusId)">
   <option *ngFor="let status of statusList" [value]="status.id">{{status.name}}
   </option>
</select>

打字稿

public setSelectedStatus(value: string): void {

  if (this.statusList && value) {
     let status: ListItemSimplified = this.statusList.find(s => s.id == value);
     if (status)
       this.selectedStatus = status.name;
   }
   else
      this.selectedStatus = '';
 }

模型类

export class ListItemSimplified {
  id: string;          
  name: string;         
}

Answer 2

getSelectedOptionText(event: Event) {
   let selectedOptions = event.target['options'];
   let selectedIndex = selectedOptions.selectedIndex;
   let selectElementText = selectedOptions[selectedIndex].text;
   console.log(selectElementText)
}

HTML

<select class="form-control select" formControlName="Industry" (change)="getSelectedOptionText($event)">
  <option value="">Please select Value</option>  
  <option *ngFor="let industry of industries" value="{{industry.ID}}">{{industry.Name}}</option>
</select>

Answer 3

您可以使用

<select class="form-control" (change)="onChange($event)">

</select>

然后在组件中

onChange($event){
let text = $event.target.options[$event.target.options.selectedIndex].text;
}

Answer 4

进行以下更改

模板

<form [formGroup]="test">
    <div class="col-sm-6 form-group">
        <label>Industry</label>
        <select class="form-control select" formControlName="Industry">
      <option *ngFor="let industry of industries"  [ngValue]="industry.id">{{industry.id}} </option>  
</select>
    </div>
</form>

<pre>{{test.value | json}} </pre>

成分

import { Component,OnInit } from '@angular/core';
import {FormArray, FormGroup, FormControl, Validators} from "@angular/forms";

@Component({
  selector: 'my-app',
  templateUrl: './app.component.html',
  styleUrls: [ './app.component.css' ]
})
export class AppComponent implements OnInit { 
  name = 'Angular 5';
  test:FormGroup;
  industries = [{id:1},{id:2}];

  ngOnInit(){
     this.test = new FormGroup({
      Industry:new FormControl('')
    });

    this.test.get('Industry').valueChanges.subscribe(data => console.log(data));

  }

}

工作链接