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Figuren

AngularJS: API: ng/directive/ngChecked

ngChecked

  1. - directive in module ng

在HTML规范中不要求浏览器必须结出像checked这种布尔型属性的值(例如为true时有值,为false时无值)。如何我们在这种属性上使用Angular表达式,则当值为false时会被浏览器把属性删除。ngChecked指令解决了 checked 属性存在的这个问题。这个指令不会被浏览器删除,并且可以进行数据绑定。

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-checked="">
    ...
    </INPUT>

参数

参数 类型 详述
ngChecked expression

如果表达式为真,则在元素上放置"checked"属性。

示例

index.html
Check me to check both: <input type="checkbox" ng-model="master"><br/><input id="checkSlave" type="checkbox" ng-checked="master">
protractor.js
it('should check both checkBoxes', Function() {
  expect(element(by.id('checkSlave')).getAttribute('checked')).toBeFalsy();
  element(by.model('master')).click();
  expect(element(by.id('checkSlave')).getAttribute('checked')).toBeTruthy();});

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