angularjs-dropdown-multiselect with dynamic button text

http://dotansimha.github.io/angularjs-dropdown-multiselect/#/ Smart Button Text

by Gowtham Reddy

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/3.10.0/lodash.js"></script>
<link rel="stylesheet" href="https://bootswatch.com/slate/bootstrap.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/angularjs-dropdown-multiselect/1.2.0/angularjs-dropdown-multiselect.min.js"></script>
<h6>
    Example of sytled angularjs-dropdown-multiselect  
</h6>

<div ng-app="exampleApp" ng-controller="appController">

      <div ng-dropdown-multiselect="" options="example20data" selected-model="example20model" extra-settings="example20settings"></div>

    
</div>

JavaScript

var myApp = angular.module('exampleApp',['angularjs-dropdown-multiselect']);

myApp.controller('appController', ['$scope', function($scope) {
    
        $scope.example20model = [];
        $scope.example20data = [ 
        { id: 1, label: "David", age: 23 },
        { id: 2, label: "Jhon", age: 24 },
        { id: 3, label: "Danny", age: 26 } ];
        $scope.example20settings = 
        { searchField: 'age', 
        enableSearch: true };
        
}]);