feat: rating-conrol

Author: marryday

apps/forms/41-control-value-accessor/src/app/feedback-form/feedback-form.component.html

@@ -13,17 +13,15 @@
     [formControl]="feedbackForm.controls.email"
     placeholder="Email"
     type="email" />
-  <app-rating-control (ratingUpdated)="rating = $event"></app-rating-control>
+  <app-rating-control [formControl]="feedbackForm.controls.rating"></app-rating-control>
   <textarea
     class="feedback-form-control"
     [formControl]="feedbackForm.controls.comment"
     placeholder="Сomment text"></textarea>
   <button
     class="feedback-form-submit"
     type="submit"
-    [disabled]="
-      !feedbackForm.touched || rating === null || feedbackForm.invalid
-    ">
+    [disabled]="feedbackForm.invalid">
     Submit
   </button>
 </form>

apps/forms/41-control-value-accessor/src/app/feedback-form/feedback-form.component.ts

@@ -25,17 +25,16 @@ export class FeedbackFormComponent {
     email: new FormControl('', {
       validators: Validators.required,
     }),
+    rating: new FormControl('', {
+      validators: Validators.required,
+    }),
     comment: new FormControl(),
   });
 
-  rating: string | null = null;
-
   submitForm(): void {
-    this.feedBackSubmit.emit({
-      ...this.feedbackForm.value,
-      rating: this.rating,
-    });
+    if (this.feedbackForm.invalid) return;
 
+    this.feedBackSubmit.emit(this.feedbackForm.value);
     this.feedbackForm.reset();
   }
 }

apps/forms/41-control-value-accessor/src/app/rating-control/rating-control.component.ts

@@ -1,20 +1,54 @@
-import { Component, EventEmitter, Output } from '@angular/core';
+import { Component, forwardRef } from '@angular/core';
+import { ControlValueAccessor, NG_VALUE_ACCESSOR } from '@angular/forms';
+
+// eslint-disable-next-line @typescript-eslint/no-empty-function
+function noop() {}
 
 @Component({
   standalone: true,
   selector: 'app-rating-control',
   templateUrl: 'rating-control.component.html',
   styleUrls: ['rating-control.component.scss'],
+  providers: [
+    {
+      provide: NG_VALUE_ACCESSOR,
+      useExisting: forwardRef(() => RatingControlComponent),
+      multi: true,
+    },
+  ],
 })
-export class RatingControlComponent {
-  @Output()
-  readonly ratingUpdated: EventEmitter<string> = new EventEmitter<string>();
+export class RatingControlComponent implements ControlValueAccessor {
+  protected isDisabled = false;
+
+  protected value: number | null = null;
+
+  private _onChange: (value: string) => void = noop;
+  private _onTouch = noop;
 
-  value: number | null = null;
+  writeValue(value: number | null): void {
+    this.value = value;
+  }
+
+  registerOnChange(fn: (value: string) => void): void {
+    this._onChange = fn;
+  }
+
+  registerOnTouched(fn: typeof noop): void {
+    this._onTouch = fn;
+  }
+
+  setDisabledState(isDisabled: boolean): void {
+    this.isDisabled = isDisabled;
+  }
 
   setRating(index: number): void {
+    if (this.isDisabled) {
+      return;
+    }
+
     this.value = index + 1;
-    this.ratingUpdated.emit(`${this.value}`);
+    this._onTouch();
+    this._onChange(this.value.toString());
   }
 
   isStarActive(index: number, value: number | null): boolean {