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AngularJS: API: ng/directive/ngReadonly

ngReadonly

  1. - directive in module ng

HTML规范不要求浏览器对布尔型属性必须给出值,例如readonly(它们存在表示true,不存在表示false)。 如果我们放置了一个Angular动态表达式到这样的属性上,在浏览器删除属性时绑定信息将会丢失。 ngReadonly指令解决了readonly属性的这个问题。这个指令不会被浏览器删除,并提供了一个永久的可靠的地方存放绑定信息。

指令信息

  • 这个指令执行优先级为100.

用法

  • 作为属性使用:
    <INPUT
      ng-readonly="">
    ...
    </INPUT>

参数

参数 类型 详述
ngReadonly expression

如果表达式为真, 指定的属性"readonly" 会被设到元素上。

示例

index.html
Check me to make text readonly: <input type="checkbox" ng-model="checked"><br/><input type="text" ng-readonly="checked" value="I'm Angular"/>
protractor.js
it('should toggle readonly attr', Function() {
  expect(element(by.css('[type="text"]')).getAttribute('readonly')).toBeFalsy();
  element(by.model('checked')).click();
  expect(element(by.css('[type="text"]')).getAttribute('readonly')).toBeTruthy();});
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