angularjs $watch demo

时间：2023-03-08 19:47:49
<!doctype html>

<html lang="en" ng-app>

<head>

    <meta charset="UTF-8">

    <title>Document</title>

    <script src="lib/angular.js"></script>

</head>

<body>

    <div ng-controller="CartController">

        <div ng-repeat="item in items">

            <span>{{item.title}}</span>

            <input type="text" ng-model="item.quantity">

            <span>{{item.price | currency}}</span>

            <span>{{item.price*item.quantity | currency}}</span>

        </div>

        <div>Total: {{totalCart() | currency}}</div>

        <div>Discount: {{bill.discount | currency}}</div>

        <div>Subtotal {{bill.subtotal | currency}}</div>

    </div>

    <script>

        function CartController($scope) {

            $scope.bill = {};

            $scope.items = [{title: 'Paint pots', quantity: 8, price: 3.95}, {title: 'Polka dots', quantity: 17, price: 12.95}, {title: 'Pebbles', quantity: 5, price: 6.95}];

            $scope.totalCart = function () {

                var total = 0;

                for (var i = 0; i< $scope.items.length; i++) {

                    total += $scope.items[i].price*$scope.items[i].quantity;

                }

                return total;

            }

            var calculateTotals = function () {

                var total = 0;

                for (var i = 0; i < $scope.items.length; i++) {

                    total += $scope.items[i].price*$scope.items[i].quantity;

                }

                $scope.bill.totalCart = total;

                $scope.bill.discount = total > 100 ? 10 : 0;

                $scope.bill.subtotal = total - $scope.bill.discount;

            }

            $scope.$watch('items', calculateTotals, true);

        }

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