Програма

<script>

var app = angular.module("myShoppingList", []); 

app.controller("myCtrl", function($scope) {

    $scope.products = ["Milk", "Bread", "Cheese"];

    $scope.addItem = function () {

        $scope.products.push($scope.addMe);

    }    

});

</script>

<div ng-app="myShoppingList" ng-controller="myCtrl">

  <ul>

    <li ng-repeat="x in products">{{x}}</li>

  </ul>

  <input ng-model="addMe">

  <button ng-click="addItem()">Add</button>

</div>

<p>Write in the input field to add items.</p>

<!DOCTYPE html>

<html>

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js"></script>

<link rel="stylesheet" href="https://www.w3schools.com/w3css/4/w3.css">

<body>

<script>

var app = angular.module("myShoppingList", []); 

app.controller("myCtrl", function($scope) {

    $scope.products = ["Milk", "Bread", "Cheese"];

    $scope.addItem = function () {

        $scope.errortext = "";

        if (!$scope.addMe) {return;}

        if ($scope.products.indexOf($scope.addMe) == -1) {

            $scope.products.push($scope.addMe);

        } else {

            $scope.errortext = "The item is already in your shopping list.";

        }

    }

    $scope.removeItem = function (x) {

        $scope.errortext = "";    

        $scope.products.splice(x, 1);

    }

});

</script>

<div ng-app="myShoppingList" ng-cloak ng-controller="myCtrl" class="w3-card-2 w3-margin" style="max-width:400px;">

  <header class="w3-container w3-light-grey w3-padding-16">

    <h3>My Shopping List</h3>

  </header>

  <ul class="w3-ul">

    <li ng-repeat="x in products" class="w3-padding-16">{{x}}<span ng-click="removeItem($index)" style="cursor:pointer;" class="w3-right w3-margin-right">×</span></li>

  </ul>

  <div class="w3-container w3-light-grey w3-padding-16">

    <div class="w3-row w3-margin-top">

      <div class="w3-col s10">

        <input placeholder="Add shopping items here" ng-model="addMe" class="w3-input w3-border w3-padding">

      </div>

      <div class="w3-col s2">

        <button ng-click="addItem()" class="w3-btn w3-padding w3-green">Add</button>

      </div>

    </div>

    <p class="w3-text-red">{{errortext}}</p>

  </div>

</div>

</body>

</html>