javascript - Model won't update in Angular 2 radio list - Stack Overflow

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I'm trying to build a Angular 2 ponent which displays a list of options with radios. It works fine but it the answer field of the ponent, which is bound inside [(ng-model)]="answer", won't update when selecting one of the options. Am I doing something wrong or isn't this the way to create a list of radio selection options?

  <div>
    Answer: {{ answer }}
  </div>
  <div class="radio" *ng-for="#option of itemData">
      <label>
          <input type="radio" [value]="option.id" [(ng-model)]="answer"
                 (change)="responseChanged()" name="radio-list">
          <span>{{ option.name }}</span>
      </label>
  </div>

Plunker

I'm trying to build a Angular 2 ponent which displays a list of options with radios. It works fine but it the answer field of the ponent, which is bound inside [(ng-model)]="answer", won't update when selecting one of the options. Am I doing something wrong or isn't this the way to create a list of radio selection options?

  <div>
    Answer: {{ answer }}
  </div>
  <div class="radio" *ng-for="#option of itemData">
      <label>
          <input type="radio" [value]="option.id" [(ng-model)]="answer"
                 (change)="responseChanged()" name="radio-list">
          <span>{{ option.name }}</span>
      </label>
  </div>

Plunker

• javascript
• web-ponent
• angular

Share Improve this question Follow edited Mar 31, 2021 at 8:09 Syscall 19.8k1010 gold badges4343 silver badges5858 bronze badges asked Oct 27, 2015 at 13:00 lucassplucassp 4,16733 gold badges2828 silver badges3636 bronze badges 1

• 1 Here's a custom implementation for radio, don't know about lists though. – Eric Martinez Commented Oct 27, 2015 at 20:50

Add a ment  | 

2 Answers 2

Sorted by: Reset to default 6

Well i guess two way binding is now working with radio, so currently you cannot use [(ng-model)].

The alternative is to use the change event and checked attribute. See my plunker

https://plnkr.co/edit/7Zm3qgoSv22Y9KrBn4tS?p=preview

(change)="answer=$event.target.value"

and

[checked]='answer==option.id'

You cannot use ng-model with radio boxes like in angular1. However there are several ponents on github that allows you to do it easily, like ng2-radio-group ponent. It has support for both radio select and multiple checkboxes select:

<radio-group [(ngModel)]="sortBy">
    <input type="radio" value="rating"> Rating<br/>
    <input type="radio" value="date"> Date<br/>
    <input type="radio" value="watches"> Watch count<br/>
    <input type="radio" value="ments"> Comment count<br/>
</radio-group>


<checkbox-group [(ngModel)]="orderBy">
    <input type="checkbox" value="rating"> Rating<br/>
    <input type="checkbox" value="date"> Date<br/>
    <input type="checkbox" value="watches"> Watch count<br/>
    <input type="checkbox" value="ments"> Comment count<br/>
</checkbox-group>

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