AngularJS实现输入框字数限制提醒功能

小云云 原创: 2018-01-02 15:43:48 1628浏览

本文主要介绍了AngularJS实现的输入框字数限制提醒功能,涉及AngularJS事件监听与元素属性动态操作相关实现技巧,需要的朋友可以参考下，希望能帮助到大家。

<!DOCTYPE html>
<html>
<head lang="en">
  <meta charset="UTF-8">
  <title>www.jb51.net AngularJS字数提示</title>
</head>
<style>
  *{
    margin:0;
    padding:0;
  }
  input,button,textarea,select{
    outline:none;
  }
  textarea{
    resize:none;
  }
  .content{
    width:350px;
    height:150px;
    font-size:18px;
    text-indent:40px;
    overflow-y: hidden;
    overflow-x: hidden;
  }
  .content:hover{
    border:1px solid #00ffff;
    cursor:pointer;
  }
  .top{
    vertical-align:top;
  }
  .fontColor
  {
    color:#eee;
  }
  .tableT td{
    margin-right:20px;
  }
</style>
<body ng-app="myApp" ng-controller="myControl">
<table class="tableT">
  <tr>
    <td class="top">退货说明&nbsp:</td>
    <td><textarea id="sayId" class="content" ng-model="say" ng-keyup="changeText()"></textarea></td>
  </tr>
  <tr>
    <td></td>
    <td class="fontColor">你还可以输入{{textLength}}字</td>
  </tr>
</table>
</body>
<script type="text/javascript" src="../js/jquery-1.8.3.js"></script>
<script type="text/javascript" src="../js/angular.min.js"></script>
<script type="text/javascript">
  var app = angular.module('myApp',[]);
  app.controller('myControl',function($scope){
    $scope.textLength = 10;
    $scope.changeText = function(){
      var length = $("#sayId").val().length;  //使用$scope.say.length的时候，输入空格的时候没有计算空格长度。
      console.log(length);
      $scope.textLength = 10 - length;
      if($scope.textLength<=0){
        $scope.textLength = 0;
        $("#sayId").val($scope.say.slice(0,10));
      }
    }
  });
</script>
</html>

运行效果：

AngularJS实现输入框字数限制提醒功能

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