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<!DOCTYPE html>
<html ng-app="myApp" ng-controller="MyApp">
<head>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.1.5/angular.min.js"></script>
<meta charset=utf-8 />
<title>JS Bin</title>
</head>
<body>
  
  {{main.newGoal.end_day}}
  
  <select
    class="input-xlarge"
    ng-model="main.newGoal.end_day" 
    ng-options="getKey(key) as val for (key, val) in options.weekDays">
  </select>
  <select
    class="input-xlarge"
    ng-model="main.newGoal.end_day" 
    ng-options="item.key as item.val for item in options.weekDays | parseInt">
  </select>
  <select
    class="input-xlarge"
    ng-model="main.newGoal.end_day" 
    ng-options="options.weekDays.indexOf(item) as item for item in options.weekDays">
  </select>
​
</body>
</html>
 
var app = angular.module('myApp', []);
​
app.controller('MyApp', function($scope) {
  
  $scope.options = {
    weekDays: ['Sun','Mon','Tue','Wed','Thu','Fri','Sat']
  };
  
  $scope.main = {
    newGoal: {
      end_day: 2,
      end_day_copy: 2
    }
  };
  
  $scope.$watch('main.newGoal.end_day', function(newval, oldval) {
    console.log('main', typeof newval);
  });
  
  $scope.getKey = function(key) {
    console.log('key typeof',typeof key);
    return parseInt(key, 10); 
  };
  
});
​
app.filter('parseInt', [function() {
  return function(input) {
    var newinput = [];
    angular.forEach(input, function (val, key) {
      this.push({key: key, val: val});
    }, newinput);
    return newinput;
  };
}]);
​
app.directive('parseInt', [function () {
    return {
        restrict: 'A',
        require: 'ngModel',
        link: function (scope, elem, attrs, controller) {
            controller.$formatters.push(function (modelValue) {
                return parseInt(modelValue, 10);
            });
​
            controller.$parsers.push(function (viewValue) {
                return ''+viewValue;
            });
        }
    };
} ]);
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