问题描述
在Angular 4应用中，我有一个带有多个控件的表单.
In my Angular 4 app, I have a form with several controls.
在某些时候，我需要强制更新其有效性，所以我正在这样做:
At some points I need to force the update of their validity, so I'm doing:
this.form.get('control1').updateValueAndValidity();
this.form.get('control2').updateValueAndValidity();
this.form.get('control3').updateValueAndValidity();
// and so on....
然后:
this.form.updateValueAndValidity();
这很好.
但是我想知道是否有更好的方法来完成相同的事情，只需在父窗体上调用一个方法即可.
However I was wondering if there is a better way to accomplish the same thing, by just calling one method on the parent form.
根据其文档，使用updateValueAndValidity()方法:
但就我而言，我需要更新其后代的价值和有效性.这样我就可以摆脱很多代码行.
but in my case I need to update the value and validity of its descendants. So I can get rid of many lines of code.
推荐答案
目前无法使用AbstractControl自身更新AbstractControl的后代(FormGroup，...).也许在将来的版本中是可能的.
It is not possible at the moment to update the descendants of an AbstractControl (FormGroup, ...) with the AbstractControl itself. Maybe in a future release it will be possible.
https://github.com/angular/angular/issues/6170
https://github.com/angular/angular/issues/22166
更新:拉取请求已经打开 https://github.com/angular/angular/pull/19829
update: a pull request is already openhttps://github.com/angular/angular/pull/19829
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