javascript - How to do radio buttons in Angular -

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this code. when submit switchcolors, server returns undefined it. how wrong?

also how should initiate $scope.swichcolors in controller? have $scope.switchcolors = '';

<label class="radio-inline">     <input type="radio" ng-model="$parent.switchcolors" value = "yes" >yes</input> </label>  <label class="radio-inline">     <input type= "radio" ng-model = "$parent.switchcolors" value = "no" >no</input> </label>

try using ng-value instead of value 

 <label class="radio-inline">         <input type="radio" ng-model="$parent.switchcolors" ng-value = "yes" >yes</input>     </label>      <label class="radio-inline">         <input type= "radio" ng-model = "$parent.switchcolors" ng-value = "no" >no</input>     </label>

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