I am working with a dynamic FormGroup and I need to add an error to a form control programmatically. However, the current method I know of replaces any existing errors as shown below:
this.userForm.controls.username.setErrors({
'exists': 'Username already exists'
});
Is there a way to append a single error to a dynamic FormGroup control without replacing existing errors?
control.updateErrors({ ...(control.errors || {}), 'additionalError': 'detailed description of the issue' })
To add a new error, you can merge the existing errors with your new error object.
control.errors || {}
This line helps to prevent any issues with non-spreadable values like undefined or null.
Implement spread operator
const existingErrors = this.userForm.controls.username.errors || {};
this.userForm.controls.username.setErrors({
'exists': 'Username already exists', ...existingErrors
})
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