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Angular中ng-bind和ng-model的区别实例详解

程序员文章站 2022-04-29 08:57:39
ng-bind和ng-model的区别 angularjs的数据绑定有ng-bind和ng-model,一般用于如下:

ng-bind和ng-model的区别

angularjs的数据绑定有ng-bind和ng-model,一般用于如下:

<input ng-model="object.xxx">
<span ng-bind="object.xxx"></span>

ng-bind是单向绑定,由作用于$scope到view层,且在html控件(html控件有:input、select、button和textarea)中不可显示。

ng-model是双向绑定,$scope<--->view层。

{{}}用于显示数据。

完整代码

<!doctype html> 
<html> 
<meta charset="utf-8"> 
<head> 
<style> 
div textarea{ 
 background-color:yellow; 
} 
</style> 
<script src="https://cdn.static.runoob.com/libs/angular.js/1.4.6/angular.min.js"></script> 
</head> 
<body ng-app="mynoteapp"> 
<div class="aa" ng-controller="mynotectrl"> 
<h2>我的笔记</h2> 
<p> 
<textarea ng-model="message" rows="10" cols="20" maxlength="100"> 
</textarea> 
</p> 
<p> 
<button ng-click="save()">保存</button> 
<button ng-click="clear()">清除</button> 
</p> 
<p>number of characters left: <span ng-bind="left()"></span></p> 
<p>number of characters left(method2): <span>{{leftvar}}</span></p> 
</div> 
<script> 
var app = angular.module("mynoteapp",[]); 
app.controller("mynotectrl",function($scope){ 
  $scope.message = ""; 
  $scope.leftvar = 0; 
  $scope.left = function() {$scope.leftvar = 100 - $scope.message.length;return $scope.leftvar;}; 
  $scope.clear = function() {$scope.message = "";}; 
  $scope.save = function() {alert("note saved");}; 
}); 
</script> 
</body> 
</html> 

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