Question

我正在尝试在Angular 4中获取Select控件的选定文本选项。

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。

请建议回复选定文本选择控件

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目。

<强> HTML

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

<强>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

您可以简单地使用$ event属性获取所选值和文本

html代码

<label>Select Market</label><br/> 
<select class="user-preselect btn-add" style="width: 90%;height: 34px;"(change)="selectchange($event)"> 
<option value="0" selected="selected">ADD Market</option> 
<option *ngFor="let country of Countrylist" [value]="country.id" >{{country.name}}</option> 
</select><br/><br/>

打字稿代码

selectchange(args){ 
  this.countryValue = args.target.value; 
  this.countryName = args.target.options[args.target.selectedIndex].text; 
}

Answer 4

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 5

如果您只想要标题值。

只需使用：

public onOptionsSelected(event) {
   const value = event.target.value;

    let id = event.target.options[event.target.options.selectedIndex].title;
    alert(id);
}

Answer 6

使用#reference变量，比其他任何答案都容易得多。

进行了大量实验，以使其正常工作。

<select #selectedSegment id="segment" name="segment" [(ngModel)]="entryForm.segmentId" type="text">
    <option *ngFor="let segment of segments" value="{{segment.id}}">{{segment.segmentName}}</option>
</select>

<div *ngIf="selectedSegment.selectedIndex !== -1 && selectedSegment.options.item(selectedSegment.selectedIndex).text === 'Testing'">

    {{ selectedSegment.options.item(selectedSegment.selectedIndex).text }}

</div>

Answer 7

HTML：

Rook.py

.ts：

from tkinter import *
from classes.ChessBoard import *
from classes.Pieces import *


class Rook(Pieces):

    def __init__(self, X, Y, color):

        Pieces.__init__(self, X, Y, color)

        self.img = PhotoImage(file=path + "T{}.gif".format(self.color[0].upper()))
        self.board.create_image(self.coordinatX, self.coordinatY, anchor=NW, image=self.img)

Answer 8

在 .ts 页中，输入以下代码。

（this.industries.filter（（ele）=> {return ele.ID == this.form.controls ['Industry']。value}））[0]。名称

您将获得行业名称。

Answer 9

进行以下更改

<强>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>

<强>组件

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));

  }

}

Working Link

Answer 10

尝试以下方法：

模板

upload.component.html

<form [formGroup]="form">
  <div class="col-sm-6 form-group">
    <label>Industry</label>
      <select class="form-control select" 
        formControlName="industry" (change)="onChange()">
          <option value="">Please select Value</option>  
          <option *ngFor="let industry of industries"  
            [ngValue]="industry.id">{{ industry.name }}  
          </option>  
      </select> 
  </div>
</form>

组件

upload.component.ts

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

@Component({
  selector: 'app-upload',
  templateUrl: './upload.component.html',
  styleUrls: [ './upload.component.css' ]
})    

export class UploadComponent implements OnInit { 
  form: FormGroup;
  select: FormControl;
  industries = [
    {id: 1, name: 'Mining'},
    {id: 2, name: 'Information Technology'},
    {id: 3, name: 'Entertainment'}
  ];

  ngOnInit(){
    this.createForm();
  }

  createForm() {
    this.select = new FormControl('');
    this.form = new FormGroup({
      select: this.select
    });
  }

  onChange() {
    console.log(this.select.value);

    # to get the name that was selected

    const id = parseInt(this.select.value, 0);
    const selected = this.industries
      .filter(industry => industry.id === id)
      .reduce(function(str: string, project) {
        return str + project.name;
      }, '');

    console.log(selected.name);
  }
}

希望这有助于及时。：）

Answer 11

您可以这样做：

在您的视图中

<select class="select" (change)="onChange($event.target.value)" [(ngModel)]="someObject.BoundItem" name="BoundItem" #BoundItem="ngModel">
   <option *ngFor="let item of myObject" [value]="item.Id">{{item.displayiItem}}</option>
</select>

在您的组件

中

onChange(selectedId: number)
{
   this.selectedItem = this.myObject.find((x: any) => x.Id == selectedId); 
   console.log(this.selectedItem["displayItem");
}

Angular 4获取Select控件的Selected选项文本

11 个答案:

模板

组件