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並前往https://stackoverflow.com/questions/45241103/patchvalue-with-emitevent-false-triggers-valuechanges-on-angular-4-formgrou

patchValue with { emitEvent: false } triggers valueChanges ...

Try adding onlySelf: true along with the emitEvent: false in this way: this.ticketForm.patchValue(ticket, {emitEvent: false, ...

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