AngularJs: How to set radio button checked based on model

Solution 1:

Use ng-value instead of value.

ng-value="true"

Version with ng-checked is worse because of the code duplication.

Solution 2:

If you have a group of radio button and you want to set radio button checked based on model, then radio button which has same value and ng-model, is checked automatically.

<input type="radio" value="1" ng-model="myRating" name="rating" class="radio">
<input type="radio" value="2" ng-model="myRating" name="rating" class="radio">
<input type="radio" value="3" ng-model="myRating" name="rating" class="radio">
<input type="radio" value="4" ng-model="myRating" name="rating" class="radio">

If the value of myRating is "2" then second radio button is selected.

Solution 3:

One way that I see more powerful and avoid having a isDefault in all the models is by using the ng-attributes ng-model, ng-value and ng-checked.

ng-model: binds the value to your model.

ng-value: the value to pass to the ng-model binding.

ng-checked: value or expression that is evaluated. Useful for radio-button and check-boxes.

Example of use: In the following example, I have my model and a list of languages that my site supports. To display the different languages supported and updating the model with the selecting language we can do it in this way.

<!-- Radio -->
<div ng-repeat="language in languages">

  <div>
    <label>

      <input ng-model="site.lang"
             ng-value="language"
             ng-checked="(site.lang == language)"
             name="localizationOptions"
             type="radio">

      <span> {{language}} </span>

    </label>
  </div>

</div>
<!-- end of Radio -->

Our model site.lang will get a language value whenever the expression under evaluation (site.lang == language) is true. This will allow you to sync it with server easily since your model already has the change.

Solution 4:

Ended up just using the built-in angular attribute ng-checked="model"

Solution 5:

As discussed somewhat in the question comments, this is one way you could do it:

• When you first retrieve the data, loop through all locations and set storeDefault to the store that is currently the default.
• In the markup: <input ... ng-model="$parent.storeDefault" value="{{location.id}}">
• Before you save the data, loop through all the merchant.storeLocations and set isDefault to false except for the store where location.id compares equal to storeDefault.

The above assumes that each location has a field (e.g., id) that holds a unique value.

Note that $parent.storeDefault is used because ng-repeat creates a child scope, and we want to manipulate the storeDefault parameter on the parent scope.

Fiddle.