<!DOCTYPE HTML>
<html ng-app="myapp">
<head>
<title>综合小实例</title>
<meta charset="utf-8">
<link rel="stylesheet" href="../css/bootstrap.css">
<script src="../js/angular.js"></script>
<style>
.text-warning{color:red;}
</style>
</head>
<body>
<!-- 加上模块module,并把控制器写在模块中，控制器生效 -->
<div ng-controller="limitText" class="container">
<span ng-class="{'text-warning':showldWarn()}">剩余字数：{{remaining()}} / 140</span>
<div class="row">
<textarea ng-model="message" rows="20" class="col-md-6"></textarea><br>
输入的是：<span ng-bind="message"></span>
</div>
<div class="row">
<button class="btn btn-default" ng-click="send()" ng-disabled="!hasValidLength()">发送</button>
<button class="btn btn-default" ng-click="clear()">清除</button>
</div>
</div>
<script>
var myModule = angular.module("myapp",[]);
myModule.controller('limitText', ['$scope', function($scope){
var MAX_LEN = 140;
$scope.message = "ahsdhiasdh";
$scope.remaining = function(){ //返回剩余字数方法
return MAX_LEN - $scope.message.length;
}
$scope.showldWarn = function(){ //返回差值小于10的判断条件，满足该条件时调用字体标红的样式
var chazhi = MAX_LEN - $scope.message.length;
return chazhi < 10;
}
$scope.hasValidLength = function(){ //返回文本长度在有效范围内的方法
return $scope.message.length <= MAX_LEN;
}
}])
</script>
</body>
</html>
