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Assign the value to the variable in ng-click using AngularJS

<html ng-app>
<head>
     <title>ActiveTuts - AngularJs Tutorials</title>
<script type="text/javascript"
    src="http://ajax.googleapis.com/ajax/libs/angularjs/1.0.7/angular.min.js"></script>
</head>
     <body>
     <div ng-controller="TodoCtrl">   
       <h2>Show and Hide the text using AngualrJs</h2>
       <div ng-controller="TodoCtrl">
          <input type="button" value="Show" ng-click="showText=true">
          <input type="button" value="Hide" ng-click="showText=false">
          <br/><br/><br/>
          <div ng-show="showText">I am Ganeshkumar</div>     
          <div ng-show="!showText">Ok bye! See you later</div> 
       </div>
     </div>   
     <script type="text/javascript">
         function TodoCtrl($scope) {
            $scope.showText = false;
         }
     </script>
     </body>
</html>

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