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並前往https://www.jauernig-it.de/angular-material-design-mat-error-with-custom-controlvalueaccessor/

Angular Material: mat-error with custom ControlValueAccessor

It has a nice functionality to show errors on mat-form-field components, if their state is invalid, by using 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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  4. MatFormFieldControl
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