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並前往https://stackoverflow.com/questions/46745171/angular-material-show-mat-error-on-button-click

Angular Material - show mat-error on button click - Stack ...

See how to use a form with a custom ErrorStateMatcher. If you wish to override this behavior (e.g. to show the error as soon as the invalid ...

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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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  4. MatFormFieldControl
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  5. mat-icon
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  8. mat-form-field width
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