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文字

AngularJS: API: ng/directive/ngBind

ngBind

  1. - directive in module ng

ngBind 属性告诉Angular使用所给表达式的值替换指定HTML元素的文本内容,并且在表达式的值改变时更新文本内容。

一般情况下,你不需要使用ngBind指令,可以使用像{{ expression }}形式的双花括号来替换,达到同样的效果并且只需少量命令。

使用 ngBind 替换 {{ expression }} 是更好的方法,在处于Angular编译前的原生状态时的模板被浏览器立即显示时。由于ngBind只是一个元素属性,当页面载入时它创建的绑定对用户是不可见。

这个问题的另一个替代解决方案是使用 ngCloak 指令。

指令信息

  • 这个指令执行优先级为0.

用法

  • 作为属性使用:
    <ANY
      ng-bind="">
    ...
    </ANY>
  • 作为CSS类使用:
    <ANY class="ng-bind: ;"> ... </ANY>

参数

参数 类型 详述
ngBind expression

可求值表达式。

示例

在实时预览文本框输入名称,文本框的下方会立即刷新问候信息。

index.html
<script>
  angular.module('bindExample', [])
    .controller('ExampleController', ['$scope', Function($scope) {
      $scope.name= 'Whirled';
    }]);
</script>
<div ng-controller="ExampleController">
  Enter name: <input Type="text" ng-model="name"><br>
  Hello <span ng-bind="name"></span>!
</div>
protractor.js
it('should check ng-bind', Function() {
  var nameInput = element(by.model('name'));

  expect(element(by.binding('name')).getText()).toBe('Whirled');
  nameInput.clear();
  nameInput.sendKeys('world');
  expect(element(by.binding('name')).getText()).toBe('world');});
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