ngModel

ts:

import { Component } from '@angular/core';
 
@Component({
  selector: 'my-app',
  templateUrl: './app.component.html',
  styleUrls: [ './app.component.css' ]
})
export class AppComponent  {
  levelNum:number;
  levels:Array<Object> = [
      {num: 0, name: "AA"},
      {num: 1, name: "BB"}
  ];
 
  toNumber(){
    this.levelNum = +this.levelNum;
    console.log(this.levelNum);
  }
 
  selectedLevel = this.levels[0];
 
  selectedLevelCustomCompare = {num: 1, name: "BB"}
 
  compareFn(a, b) {
    console.log(a, b, a && b && a.num == b.num);
    return a && b && a.num == b.num;
  }
}

html:

<h1>Selecting Number</h1>
<select type="number" [(ngModel)]="levelNum" (ngModelChange)="toNumber()">
  <option *ngFor="let level of levels" [ngValue]="level.num">{{level.name}}</option>
</select>
{{levelNum}}
 
<hr>
 
<h1>Selecting object</h1>
<select type="number" [(ngModel)]="selectedLevel">
  <option *ngFor="let level of levels" [ngValue]="level">{{level.name}}</option>
</select>
{{selectedLevel | json}}
 
<hr>
 
<h1>Selecting object with custom compare</h1>
<select type="number" [(ngModel)]="selectedLevelCustomCompare" [compareWith]="compareFn">
  <option *ngFor="let level of levels" [ngValue]="level">{{level.name}}</option>
</select>
{{selectedLevelCustomCompare | json}}

Leave a Reply

Your email address will not be published. Required fields are marked *