1 files changed, 69 insertions, 0 deletions

diff --git a/client/src/app/shared/shared-forms/form-reactive.ts b/client/src/app/shared/shared-forms/form-reactive.ts
new file mode 100644
index 000000000..caa31d831
--- /dev/null
+++ b/client/src/app/shared/shared-forms/form-reactive.ts
@@ -0,0 +1,69 @@
+import { FormGroup } from '@angular/forms'
+import { BuildFormArgument, BuildFormDefaultValues, FormValidatorService } from './form-validators'
+
+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
+
+      // Don't care if dirty on force check
+      const isDirty = control.dirty || forceCheck === true
+      if (control && isDirty && control.enabled && !control.valid) {
+        const messages = validationMessages[ field ]
+        for (const key of Object.keys(control.errors)) {
+          formErrors[ field ] += messages[ key ] + ' '
+        }
+      }
+    }
+  }
+
+}