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}}