angularjs通过ng-change和watch两种方式实现对表单输入改变的监控

直接上练习代码
<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

    <title></title>

</head>

<body ng-app="myApp" ng-controller="myContro">

    <div>

        <h1>ng-change指令</h1>

        ng-change指令，当表单输入发生改变时，会触发该事件<br />

        <div>

            姓名：<input type="text" id="name1" ng-model="user.name"

                placeholder="请输入姓名" ng-change="inputChange()" />

        </div>

        <div>

            年龄：<input type="number" ng-model="user.age"

                placeholder="请输入年龄" ng-change="inputChange()" />

        </div>

        <div>{{user.message}}</div>

    </div>

    <div>

        <h1>通过监听改变达到和ng-chang一样的效果</h1>

        <div>

            姓名：<input type="text" id="name2" ng-model="user2.name"

                placeholder="请输入姓名" />

        </div>

        <div>

            年龄：<input type="number" ng-model="user2.age"

                placeholder="请输入年龄" />

        </div>

        <div>{{user2.message}}</div>

    </div>

</body>

</html>

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

<script type="text/javascript">

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

    app.controller("myContro", function ($scope, $interpolate) {

        $scope.user = {

            name: "",

            age: "",

            message: ""

        };

        $scope.user2 = {

            name: "",

            age: "",

            message: ""

        };

        $scope.messageTemp = "{{name}},您好,您今年{{age}}岁啦！";

        var template = $interpolate($scope.messageTemp);

        $scope.inputChange = function () {

            $scope.user.message = template({ name: $scope.user.name, age: $scope.user.age });

        };

        //// 下面通过watch监听实现ng-change一样的效果

        $scope.$watch("user2.name", function (newValue, oldValue) {

            $scope.getMessage(newValue, oldValue);

        });

        $scope.$watch("user2.age", function (newValue, oldValue) {

            $scope.getMessage(newValue, oldValue);

        });

        $scope.getMessage = function (value1, value2) {

            if (value1 != value2) {

                $scope.user2.message = template({ name: $scope.user2.name, age: $scope.user2.age });

            }

        }

    });

</script>
巴特西

angularjs通过ng-change和watch两种方式实现对表单输入改变的监控

最新文章

热门文章
