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HTML

              
                <div ng-app="contactApp" class="container" style="margin-top: 10px;" ng-controller="ContactController as vm">
     <div class="row">
          <div class="col-sm-4 form-group">
               <label class="control-label">First Name</label>
               <input type="text" class="form-control" ng-model="vm.contact.firstName" />
          </div>
          <div class="col-sm-4 form-group">
               <label class="control-label">Last Name Name</label>
               <input type="text" class="form-control" ng-model="vm.contact.lastName" />
          </div>
          <div class="col-sm-4 form-group">
               <label class="control-label">State</label>
               <select class="form-control" ng-model="vm.contact.stateCode" ng-options="state.stateCode as state.stateName for state in vm.states">
                    <option value="">--Select One--</option>
               </select>
          </div>
          <div class="col-sm-4 form-group">
               <label class="control-label">County</label>
               <select class="form-control" ng-model="vm.contact.county" ng-options="county.countyName for county in vm.counties">
                    <option value="">--Select One--</option>
               </select>
          </div>
     </div>
</div>
              
            
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CSS

              
                
              
            
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JS

              
                angular.module('contactApp', []);

var Contact = function (data) {
	var _this = this;
	_this.firstName = data.firstName;
	_this.lastName = data.lastName;
	_this.stateCode = data.stateCode;
     _this.county = data.county;
};

ContactController.$inject = ['$scope'];
function ContactController ($scope) {
     var _this = this;
     
     _this.contact = new Contact({ firstName: 'Ken', lastName: 'Howard', stateCode: 'OR', county: 'Multnomah' });
     
     _this.states = [
          { stateCode: 'CA', stateName: 'California' },
          { stateCode: 'ID', stateName: 'Idaho' },
          { stateCode: 'OR', stateName: 'Oregon' },
          { stateCode: 'WA', stateName: 'Washington' }
     ];
     
     _this.counties = []; // We'll be updating this based on the state selected.
     
     $scope.$watch(function () {
          // The property we are watching.
          return _this.contact.stateCode;
     }, function (newValue, oldValue) {
          // When the property changes. (this occurs on initial load as well as when the model is updated in anyway, by the user or by another method.)
          if (newValue === 'OR') {
               _this.counties = [
                    { countyId: 1, countyName: 'Clackamas' },
                    { countyId: 2, countyName: 'Multnomah' },
                    { countyId: 3, countyName: 'Washington' }
               ];
           } else if (newValue === 'WA') {
               _this.counties = [
                    { countyId: 4, countyName: 'unknown' },
                    { countyId: 5, countyName: 'somewhere' },
                    { countyId: 6, countyName: 'nothere' }
               ];
           } else if (newValue === 'CA') {
               _this.counties = [
                    { countyId: 7, countyName: 'Orange' },
                    { countyId: 8, countyName: 'Los Angeles' },
                    { countyId: 9, countyName: 'San Diego' }
               ];
           } else if (newValue === 'ID') {
               _this.counties = [
                    { countyId: 10, countyName: '?' },
                    { countyId: 11, countyName: 'potato land' },
                    { countyId: 12, countyName: 'snake river' }
               ];
           }
     });
}

angular.module('contactApp').controller('ContactController', ContactController);


              
            
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