Angular2:如何通过`patchValue()`将FormGroup控件标记为脏 [英] Angular2: How do you mark FormGroup control dirty via `patchValue()`

问题描述

我正在通过例如:

this.myForm.patchValue({incidentDate:'2016-09-12');

这很好用并触发了valueChanges事件，但是此控件的dirty属性仍然是false.

This works great and triggers a valueChanges event, however this control's dirty property is still false.

我需要incidentDate控件是dirty，这样我的验证逻辑才能针对此控件运行.

I need the incidentDate control to be dirty so my validation logic knows to run against this control.

如何从组件中更新控件的值并指示其脏了?

How do I update the value of a control from my component AND indicate that it is dirty?

这是我的验证逻辑:

onValueChanged(data?: any) {
    if (!this.myForm) {
      return;
    }
    const form = this.myForm;
    for (const field in this.formErrors) {
      // clear previous error message (if any)
      this.formErrors[field] = '';
      const control = form.get(field);
      if (control && control.dirty && !control.valid) {
        const messages: any = this.validationMessages[field];
        for (const key in control.errors) {
          this.formErrors[field] += messages[key] + ' ';
        }
      }
    }
}

推荐答案

我通常这样做:

this.formControl.markAsDirty()

或者您的情况可能是:

this.myForm.get('incidentDate').markAsDirty()

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