How to set scope variable value in angularjs template

Question

I want to set value when query textbox is empty. I want to do like this:

$scope.flag=0;

This is query textbox:

<input type="text" ng-model="query" ng-change="search()" />

When user types something, I set $scope.flag=1 in js file. Hope you catch my problem. Please do needfull.

Answer 1

HTML

  <div ng-controller="myCtrl"> 
            <input type="text" ng-model="query" ng-change="search()" />
            {{ flag }} 
    </div>

JS

app.controller('myCtrl', function($scope){
      $scope.flag=0;

      $scope.search = function() {   
         $scope.flag= $scope.query.length >0 ? 1:0;
      }
});