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並前往https://www.c-sharpcorner.com/article/form-validation-inside-angular-material-table-mattable/

Form Validation Inside Angular Material Table (MatTable) In ...

On page render we loaded the mat table with all the data we had, ... <div *ngIf="name.errors.required">Name is required</div>; </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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  3. Mat-form-field' is not a known element
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  4. MatFormFieldControl
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  5. mat-icon
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  6. mat-select
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  7. matInput
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  8. mat-form-field width
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