使原始的 Angular 表单控件变脏

问题描述

Angular 4 中有一个响应式形式，一些控件应该在某个时候以编程方式设置.

There is a reactive form in Angular 4, and some control is supposed to be set programmatically at some point.

this.form = formBuilder.group({
  foo: ''
});
...
this.form.controls.foo.setValue('foo');

如何控制原始/脏状态?目前我同时使用 form 和 foo 原始状态，例如:

How can control pristine/dirty state be affected? Currently I'm using both form and foo pristine states, something like:

<form [formGroup]="form">
  <input [formControl]="form.controls.foo">
</form>

<p *ngIf="form.controls.foo.pristine">
  {{ form.controls.foo.errors | json }}
</p>

<button [disabled]="form.pristine">Submit</button>

如果 pristine/dirty 应该只指定人机交互并且不能以编程方式更改，那么这里有什么解决方案更可取?

If pristine/dirty is supposed to designate only human interaction and can't be changed programmatically, what solution would be preferable here?

推荐答案

formControl 的每个实例都有 markAsDirty() 和 markAsPristine()方法(从 AbstractControl 继承)，因此，您应该能够运行

Each instance of formControl has markAsDirty() and markAsPristine() methods (inherited from AbstractControl), so, you should be able to run

this.form.controls.foo.markAsPristine()

或者更好，使用反应式表单 API:

or better, using reactive forms API:

this.form.get('foo').markAsPristine()

甚至

this.form.markAsPristine()

同样可以使用 markAsDirty() 方法

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