javascript - Angularjs: radio button check status failed to bind model value, when model changed -


after page load, model , radio button display correctly.

however, when clicks button change rank of list item, there wrong radio button checked states. can see model value correct, displayed @ left side.

so, why button not checked , how fix it?

many thanks

html:

<body ng-app="radioapp"> <section ng-controller="radiocontroller">     <div ng-repeat="item in list">         <div ng-model="item.rank">rank: {{$index + 1}}</div>         <div>             <span>{{item.flag}}</span>             <span><label><input type="radio" name="flag_{{$index}}" ng-model="item.flag" value="1">red</label></span>             <span><label><input type="radio" name="flag_{{$index}}" ng-model="item.flag" value="2">green</label></span>             <span><label><input type="radio" name="flag_{{$index}}" ng-model="item.flag" value="3">yellow</label></span>             <span><label><input type="radio" name="flag_{{$index}}" ng-model="item.flag" value="4">blue</label></span>             <span><label><input type="radio" name="flag_{{$index}}" ng-model="item.flag" value="5">pink</label></span>         </div>     </div>     <div>         <button ng-click="changrank()">change</button>     </div> </section>

js:

var app=angular.module("radioapp", []); app.controller("radiocontroller", function($scope){     $scope.list = [{flag:1},{flag:3},{flag:5}]      $scope.changrank = function(){         var targetrule = $scope.list.splice(2, 1);         $scope.list.unshift(targetrule[0]);     } });

ps: i'm new user, sorry couldn't provide capture question.

ah, change repeater to

ng-repeat="item in list track $index"

this force angular keep track of list items place in array.

plunker demo - http://plnkr.co/edit/hszr5fjkblqgip7kc8q1?p=preview


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