html - how do I retrieve an input variable onto a javascript controller in angular? -

i have search input field , trying send input javascript variable i'd use. in angular

input

<input ng-model="searchtext" placeholder="search"> 

controller.js

angular.module('searchkingapp')   .controller('mainctrl', function($scope){ //which code can put under here?  //and end having   var searcheditem = //the string have searched for.. 

i have javascript file located in different place html file.

thanks alot in advance.

you this.

var app = angular.module("sampleapp", []);    app.controller("samplecontroller", ["$scope",    function($scope) {      $scope.searchtext = "hello";      $scope.search = function() {        console.log($scope.searchtext);      }    }  ]);

<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.5.8/angular.min.js"></script>  <div ng-app="sampleapp">    <div ng-controller="samplecontroller">      <input ng-model="searchtext" />      <button ng-click="search()">search</button>    </div>  </div>