error messages kinda

src/app/hotel/component/edit-hotel.component.ts

@@ -11,6 +11,8 @@ import {
 import {Hotel} from "../model/hotel";
 import {RouterLink} from "@angular/router";
 import {NgForOf} from "@angular/common";
+import {debounceTime} from "rxjs";
+import {ErrorMsgComponent} from "./error-msg.component";
 
 @Component({
   selector: 'app-edit-hotel',
@@ -20,24 +22,29 @@ import {NgForOf} from "@angular/common";
     ReactiveFormsModule,
     RouterLink,
     NgForOf,
+    ErrorMsgComponent,
   ],
   template: `
     <ng-form [formGroup]="form" (ngSubmit)="submit()">
       <label for="name">Name</label>
       <br>
       <input id="name" type="text" formControlName="name">
+      <app-error-msg [msg]="errorMsgs['name']"></app-error-msg>
       <br>
       <label for="description">Description</label>
       <br>
       <input id="description" type="text" formControlName="description">
+      <app-error-msg [msg]="errorMsgs['description']"></app-error-msg>
       <br>
       <label for="price">Price</label>
       <br>
       <input id="price" type="number" formControlName="price">
+      <app-error-msg [msg]="errorMsgs['price']"></app-error-msg>
       <br>
       <label for="rating">Rating</label>
       <br>
       <input id="rating" type="number" formControlName="rating" min="0" max="5">
+      <app-error-msg [msg]="errorMsgs['rating']"></app-error-msg>
       <br>
       <br>
       <button (click)="addTag()">+</button>
@@ -46,6 +53,7 @@ import {NgForOf} from "@angular/common";
           <input type="text" placeholder="tag" [formControlName]="i">
           <button (click)="deleteTag(tag)">-</button>
         </div>
+        <app-error-msg [msg]="errorMsgs['tags']"></app-error-msg>
       </div>
       <br>
       <br>
@@ -56,6 +64,8 @@ import {NgForOf} from "@angular/common";
   `,
 })
 export class EditHotelComponent implements OnInit {
+  errorMsgs: Record<string, string> = {};
+
   @Input()
   hotel: Hotel | null = null;
 
@@ -64,6 +74,12 @@ export class EditHotelComponent implements OnInit {
 
   form!: FormGroup
 
+  validationErrors: Record<string, string> = {
+    required: 'This field is required',
+    min: 'Value must be greater than or equal to 0',
+    max: 'Value must be less than or equal to 5'
+  };
+
   ngOnInit(): void {
     const tags = [];
 
@@ -78,15 +94,20 @@ export class EditHotelComponent implements OnInit {
       rating: new FormControl(this.hotel?.rating, [Validators.required, Validators.min(0), Validators.max(5)]),
       tags: new FormArray(tags),
     })
+
+    Object.keys(this.form.controls).forEach(controlName => {
+      const control = this.form.get(controlName);
+      if (!control) {
+        return;
+      }
+
+      control?.valueChanges?.pipe(debounceTime(1000)).subscribe(() => {this.setErrorMessage(controlName, control)});
+    });
   }
 
   submit() {
     if (!this.form.valid) {
-      console.error('Form invalid: ');
-      for (const key in this.form.controls) {
-        console.error(key, this.form.controls[key].errors);
-      }
-      return;
+
     }
 
     const hotel: Hotel = {
@@ -115,4 +136,8 @@ export class EditHotelComponent implements OnInit {
   deleteTag(tagElement: AbstractControl) {
     this.getTags().removeAt(this.getTags().controls.indexOf(tagElement));
   }
+
+  setErrorMessage(controlName: string, control: AbstractControl) {
+    this.errorMsgs[controlName] = Object.keys(control.errors ?? {}).map ((key) => this.validationErrors[key]).join(' ');
+  }
 }

src/app/hotel/component/error-msg.component.ts

@@ -0,0 +1,32 @@
+import {Component, Input} from "@angular/core";
+import {NgIf} from "@angular/common";
+
+
+@Component({
+  standalone: true,
+  selector: 'app-error-msg',
+  imports: [
+    NgIf
+  ],
+  template: `
+    <div *ngIf="msg" class="alert alert-danger">
+      {{ msg }}
+    </div>
+  `,
+  styles: `
+    .alert {
+      color: white;
+      background-color: red;
+      border-radius: 4px;
+      padding: 4px;
+    }
+
+    .alert-danger {
+      background-color: red;
+    }
+  `
+})
+export class ErrorMsgComponent {
+  @Input()
+  msg: string | null = null;
+}

src/index.html

@@ -8,7 +8,6 @@
   <script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap/5.3.3/js/bootstrap.min.js" integrity="sha512-ykZ1QQr0Jy/4ZkvKuqWn4iF3lqPZyij9iRv6sGqLRdTPkY69YX6+7wvVGmsdBbiIfN/8OdsI7HABjvEok6ZopQ==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>
   <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap/5.3.3/css/bootstrap-grid.min.css" integrity="sha512-i1b/nzkVo97VN5WbEtaPebBG8REvjWeqNclJ6AItj7msdVcaveKrlIIByDpvjk5nwHjXkIqGZscVxOrTb9tsMA==" crossorigin="anonymous" referrerpolicy="no-referrer" />
   <link rel="icon" type="image/x-icon" href="favicon.ico">
-  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/material-design-icons/4.0.0/iconfont/material-icons.min.css" referrerpolicy="no-referrer" />
 </head>
 <body>
   <app-root></app-root>