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並前往https://www.geeksforgeeks.org/how-to-trigger-form-validators-in-angular2/

How to trigger Form Validators in Angular2 ? - GeeksforGeeks

Errors : Angular on client-side generates a list of errors that contain all ... Hence, we are using tags like <mat-form-field>, <mat-error>, ...

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查詢 「Mat-error」的人也找了：

  1. error error: mat-form-field must contain a matformfieldcontrol
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  2. Mat-error not showing
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  3. Mat-form-field' is not a known element
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  4. MatFormFieldControl
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  5. mat-icon
    6.
  6. mat-select
    7.
  7. matInput
    8.
  8. mat-form-field width
    9.