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

2022-11-30 HTMLXMLAngularJS

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>

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