Angular2：RadioButton更改事件不绑定

Question

Here, I want to simply bind RadioButton with change event. Not using any library.

Following works fine.

<input type="radio" name="test" value="A" (change)="onPropertyChange('test')">
<input type="radio" name="test" value="B" (change)="onPropertyChange('test')">

But this one is not :

<div class="btn-group col-lg-2" data-toggle="buttons" >
<label *ngFor=" let app of applications; let i = index; " 
       class="btn btn-default " [ngClass]="{'active':( ticket.app == app)}">      
      <input type="radio" id="app{{i}}"  name="app" value="{{i}}"                   
           checked="{{ ( ticket.app == app ) ? 'checked' : ''}}" (change)=" 
           onPropertyChange('app')"  > 
     {{app}}
</label>
</div>

While binding change event to label, it is giving me old value.

Can anyone suggest right approach?

Thanks in advance...!!!

Answer 1

With Angular 2 RC2 it's no longer needed to create the RadioButtonState:

Radio Buttons can now share FormControl instance

<form #f="ngForm">
   <input type="radio" name="food" [(ngModel)]="food" value="chicken">
   <input type="radio" name="food" [(ngModel)]="food" value="fish">
</form>

And:

class MyComp {
   food = 'fish';
}

Source: 5thingsangular - Issue #8

Answer 2

Using ng2-bootstrap,

<div class="btn-group col-lg-2">
    <label *ngFor="let app of applications" class="btn btn-default" [(ngModel)]="ticket.app" btnRadio="{{app}}">{{app}}</label>
</div>

In .ts file,

• Added import { ButtonRadioDirective } from 'ng2-bootstrap/components/buttons';

• In @Component annotation, passed it as directives: [ButtonRadioDirective] .

It works fine. Hope it will work for you.

Answer 3

Two way binding without a library:

<div class="btn-group" data-toggle="buttons">
    <label class="btn btn-default" [class.active]="yourVariable==item" (click)="yourVariable=item" *ngFor="let item of items">
        <input type="radio" style="display: none;" name="radios" [(ngModel)]="yourVariable" [value]="item" [checked]="yourVariable==item" />
        {{yourLabelText}}
    </label>
</div>