@ViewChild在使用Angular Forms时返回未定义

Question

Below form(using Clarity Forms) is a part of a dialog:

<form clrForm
     clrLayout="horizontal"
     [formGroup]="editRecipientForm">
   <clr-input-container>
       <label>First Name</label>
       <input clrInput
              type="text"
              formControlName="firstName" />
       <clr-control-error>Field cannot be empty</clr-control-error>
   </clr-input-container>
   <clr-input-container>
       <label>Last Name</label>
       <input clrInput
              type="text"
              formControlName="lastName" />
       <clr-control-error>Field cannot be empty</clr-control-error>
   </clr-input-container>
</form>

which opens with the help of the following function:

onEditRecRow() {
    this.editRecipientForm = new FormGroup({
      ID: new FormControl({value: this.recSelectedList[0].ID, disabled: true}, Validators.required),
      firstName: new FormControl(this.recSelectedList[0].firstName, Validators.required),
      lastName: new FormControl(this.recSelectedList[0].lastName, Validators.required),
      emailID: new FormControl(this.recSelectedList[0].emailID, [Validators.required, Validators.pattern("^[a-z0-9._%+-]+@[a-z0-9.-]+\.[a-z]{2,4}$")])
    });

    this.editRecipientDialog = true
  }

Clarity helps me to prompt error messages if any Form Control is invalid.

I also wanted all Form Controls to be checked again once I save all my changes made in dialog, which I am doing in the following way:

  @ViewChild('ClrForm', {static: true}) clrForm;
  .
  .
  .
  onUpdateRecipient() {
    if (this.editRecipientForm.invalid) {
      this.clrForm.markAsTouched();
      console.log('Error There');
    } else {
      console.log('Recipient Updated');
    }    
  }

But @ViewChild is returning clrForm as undefined.

Thanks.

Answer 1

Try

@ViewChild(ClrForm, {static: true}) clrForm;

remove ' (single quotes) from the statement of @ViewChild

Update (Thanks to @hippeelee)

import {ClrForm} from '@clr/angular';

Answer 2

Could it be you're not referencing clrForm properly on your template?

Try <form #ClrForm clrLayout="horizontal" [formGroup]="editRecipientForm"> <clr-input-container>

https://angular.io/api/core/ViewChild