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

时间:2020-05-16 返回主页 xiaoxuzi 人气:0

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>

总结

以上所述是小编给大家介绍的angularjs实现对表单输入改变的监控，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对网站的支持！

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