AngularJs: How to set radio button checked based on model
JavascriptAngularjsRadio GroupJavascript Problem Overview
I have a model returning in the storeLocations object with a isDefault value. if isDefault returns true, I wan't to set that radio button in the group as checked.
Not sure if I need to do a $each(data, function(index,value) and iterate through each object returned or if there's an easier way to do this using angular constructs.
Object:
storeLocations = [
{
... more values,
isDefault: true
}
]
Markup:
<tr ng-repeat="location in merchant.storeLocations">
<td>{{location.name}}</td>
<td>{{location.address.address1}}</td>
<td>{{location.address.address2}}</td>
<td>{{location.address.city}}</td>
<td>{{location.address.stateProvince}}</td>
<td>{{location.address.postalCode}}</td>
<td>{{location.address.country}}</td>
<td>{{location.website}}</td>
<td>{{location.zone}}</td>
<td><input type="radio" ng-model="location.isDefault" value="{{location.isDefault}}" name="isDefault_group"></td>
Javascript Solutions
Solution 1 - Javascript
Use ng-value
instead of value
.
ng-value="true"
Version with ng-checked
is worse because of the code duplication.
Solution 2 - Javascript
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 - Javascript
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 - Javascript
Ended up just using the built-in angular attribute ng-checked="model"
Solution 5 - Javascript
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.
Solution 6 - Javascript
Just do something like this,<input type="radio" ng-disabled="loading" name="dateRange" ng-model="filter.DateRange" value="1" ng-checked="(filter.DateRange == 1)"/>