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
代码语言：javascript复制<!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>
