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import { FormGroup } from '@angular/forms'
import { BuildFormArgument, BuildFormDefaultValues } from '../form-validators/form-validator.model'
import { FormValidatorService } from './form-validator.service'
export type FormReactiveErrors = { [ id: string ]: string | FormReactiveErrors }
export type FormReactiveValidationMessages = {
[ id: string ]: { [ name: string ]: string } | FormReactiveValidationMessages
}
export abstract class FormReactive {
protected abstract formValidatorService: FormValidatorService
protected formChanged = false
form: FormGroup
formErrors: any // To avoid casting in template because of string | FormReactiveErrors
validationMessages: FormReactiveValidationMessages
buildForm (obj: BuildFormArgument, defaultValues: BuildFormDefaultValues = {}) {
const { formErrors, validationMessages, form } = this.formValidatorService.buildForm(obj, defaultValues)
this.form = form
this.formErrors = formErrors
this.validationMessages = validationMessages
this.form.valueChanges.subscribe(() => this.onValueChanged(this.form, this.formErrors, this.validationMessages, false))
}
protected forceCheck () {
return this.onValueChanged(this.form, this.formErrors, this.validationMessages, true)
}
protected check () {
return this.onValueChanged(this.form, this.formErrors, this.validationMessages, false)
}
private onValueChanged (
form: FormGroup,
formErrors: FormReactiveErrors,
validationMessages: FormReactiveValidationMessages,
forceCheck = false
) {
for (const field of Object.keys(formErrors)) {
if (formErrors[field] && typeof formErrors[field] === 'object') {
this.onValueChanged(
form.controls[field] as FormGroup,
formErrors[field] as FormReactiveErrors,
validationMessages[field] as FormReactiveValidationMessages,
forceCheck
)
continue
}
// clear previous error message (if any)
formErrors[field] = ''
const control = form.get(field)
if (control.dirty) this.formChanged = true
if (forceCheck) control.updateValueAndValidity({ emitEvent: false })
if (!control || !control.dirty || !control.enabled || control.valid) continue
const staticMessages = validationMessages[field]
for (const key of Object.keys(control.errors)) {
const formErrorValue = control.errors[key]
// Try to find error message in static validation messages first
// Then check if the validator returns a string that is the error
if (typeof formErrorValue === 'boolean') formErrors[field] += staticMessages[key] + ' '
else if (typeof formErrorValue === 'string') formErrors[field] += control.errors[key]
else throw new Error('Form error value of ' + field + ' is invalid')
}
}
}
}
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