client/src/app/shared/forms/form-validators/form-validator.service.ts

   1 import { FormBuilder, FormControl, FormGroup, ValidatorFn } from '@angular/forms'
   2 import { Injectable } from '@angular/core'
   3 import { FormReactiveErrors, FormReactiveValidationMessages } from '@app/shared/forms/form-reactive'
   4
   5 export type BuildFormValidator = {
   6   VALIDATORS: ValidatorFn[],
   7   MESSAGES: { [ name: string ]: string }
   8 }
   9 export type BuildFormArgument = {
  10   [ id: string ]: BuildFormValidator
  11 }
  12 export type BuildFormDefaultValues = {
  13   [ name: string ]: string | string[]
  14 }
  15
  16 @Injectable()
  17 export class FormValidatorService {
  18
  19   constructor (
  20     private formBuilder: FormBuilder
  21   ) {}
  22
  23   buildForm (obj: BuildFormArgument, defaultValues: BuildFormDefaultValues = {}) {
  24     const formErrors: FormReactiveErrors = {}
  25     const validationMessages: FormReactiveValidationMessages = {}
  26     const group: { [key: string]: any } = {}
  27
  28     for (const name of Object.keys(obj)) {
  29       formErrors[name] = ''
  30
  31       const field = obj[name]
  32       if (field && field.MESSAGES) validationMessages[name] = field.MESSAGES
  33
  34       const defaultValue = defaultValues[name] || ''
  35
  36       if (field && field.VALIDATORS) group[name] = [ defaultValue, field.VALIDATORS ]
  37       else group[name] = [ defaultValue ]
  38     }
  39
  40     const form = this.formBuilder.group(group)
  41     return { form, formErrors, validationMessages }
  42   }
  43
  44   updateForm (
  45     form: FormGroup,
  46     formErrors: FormReactiveErrors,
  47     validationMessages: FormReactiveValidationMessages,
  48     obj: BuildFormArgument,
  49     defaultValues: BuildFormDefaultValues = {}
  50   ) {
  51     for (const name of Object.keys(obj)) {
  52       formErrors[name] = ''
  53
  54       const field = obj[name]
  55       if (field && field.MESSAGES) validationMessages[name] = field.MESSAGES
  56
  57       const defaultValue = defaultValues[name] || ''
  58
  59       if (field && field.VALIDATORS) form.addControl(name, new FormControl(defaultValue, field.VALIDATORS))
  60       else form.addControl(name, new FormControl(defaultValue))
  61     }
  62   }
  63
  64 }