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AngularJS: API: ng/directive/ngReadonly
ngReadonly
- - 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();});