add client side validation errors

src/app/features/auth/components/register/register.html

@@ -1,4 +1,6 @@
-<section class="my-10 md:my-30 flex flex-col md:flex-row space-x-20 space-y-10 justify-center items-center">
+<section
+  class="my-10 md:my-30 flex flex-col md:flex-row space-x-20 space-y-10 justify-center items-center"
+>
   <article class="space-y-6">
     <h1 class="text-3xl text-gray-800 font-space font-bold">Register</h1>
     <h2 class="text-xl text-gray-600">Sign up with your<br />email address to get started</h2>
@@ -9,41 +11,62 @@
     </div>
   </article>
 
-  <form [formGroup]="registerForm" (ngSubmit)="registerUser()"
-        class="card max-w-11/12 sm:max-w-8/12 grid md:grid-cols-2 gap-4">
-    <article class="space-y-4">
+  <form
+    [formGroup]="registerForm"
+    (ngSubmit)="registerUser()"
+    class="card max-w-11/12 sm:max-w-8/12 grid md:grid-cols-2 gap-4"
+  >
     <fieldset class="fieldset">
-        <legend class="fieldset-legend">Name</legend>
+      <legend class="fieldset-legend">Name*</legend>
       <input type="text" class="input" formControlName="name" placeholder="Jhon Doe" />
+      <app-error fieldName="name" [control]="registerForm.get('name')" />
     </fieldset>
+
     <fieldset class="fieldset">
-        <legend class="fieldset-legend">Mobile Number</legend>
-        <input type="text" class="input" formControlName="mobile_number" placeholder="+X1 XXXXXXXXXX"/>
+      <legend class="fieldset-legend">Mobile Number*</legend>
+      <input
+        type="text"
+        class="input"
+        formControlName="mobile_number"
+        placeholder="+X1 XXXXXXXXXX"
+      />
+      <app-error fieldName="mobile number" [control]="registerForm.get('mobile_number')" />
     </fieldset>
+
     <fieldset class="fieldset">
-        <legend class="fieldset-legend">Email</legend>
+      <legend class="fieldset-legend">Email*</legend>
       <input type="text" class="input" formControlName="email" placeholder="Enter email here" />
       <p class="label">your-email-address@email.com</p>
-      </fieldset>
-    </article>
-    <article class="space-y-4">
-      <fieldset class="fieldset">
-        <legend class="fieldset-legend">Password</legend>
-        <input type="password" class="input" formControlName="password" placeholder="Type here"/>
+      <app-error fieldName="email" [control]="registerForm.get('email')" />
     </fieldset>
 
     <fieldset class="fieldset">
-        <legend class="fieldset-legend">Confirm Password</legend>
-        <input type="text" class="input" formControlName="password_confirmation" placeholder="Type here"/>
-      </fieldset>
-
-      <fieldset class="fieldset">
-        <legend class="fieldset-legend">City</legend>
+      <legend class="fieldset-legend">City*</legend>
       <input type="text" class="input" formControlName="city" placeholder="Your city name" />
+      <app-error fieldName="city" [control]="registerForm.get('city')" />
     </fieldset>
-    </article>
+
+    <fieldset class="fieldset">
+      <legend class="fieldset-legend">Password*</legend>
+      <input type="password" class="input" formControlName="password" placeholder="Type here" />
+      <app-error fieldName="password" [control]="registerForm.get('password')" />
+    </fieldset>
+
+    <fieldset class="fieldset">
+      <legend class="fieldset-legend">Confirm Password*</legend>
+      <input
+        type="text"
+        class="input"
+        formControlName="password_confirmation"
+        placeholder="Type here"
+      />
+      <app-error [control]="registerForm.get('password_confirmation')" />
+    </fieldset>
+
     <div class="flex flex-col col-span-2 gap-y-2">
-      <button type="submit" class="btn btn-black py-2 w-full">Register</button>
+      <button type="submit" [disabled]="registerForm.invalid" class="btn btn-black py-2 w-full">
+        Register
+      </button>
       <a href="" class="text-xs text-gray-800 text-center w-full block hover:text-teal-600"
         >Already have an account ? Login</a
       >

src/app/features/auth/components/register/register.ts

@@ -1,39 +1,42 @@
 import { Component, inject, signal } from "@angular/core";
-import {FormControl, FormGroup, ReactiveFormsModule} from "@angular/forms";
+import { FormControl, FormGroup, ReactiveFormsModule, Validators } from "@angular/forms";
 import { AuthService } from "../../services/auth-service";
 import { RegisterUserRequest } from "../../../../core/models/user.model";
+import { Error } from "../../../../shared/components/error/error";
 
 @Component({
   selector: "app-register",
-  imports: [ReactiveFormsModule],
+  imports: [ReactiveFormsModule, Error],
   templateUrl: "./register.html",
   styleUrl: "./register.css",
 })
 export class Register {
-
   authService = inject(AuthService);
   errors = signal<string[]>([]);
 
   registerForm = new FormGroup({
-    name: new FormControl(''),
-    email: new FormControl(''),
-    mobile_number: new FormControl(''),
-    password: new FormControl(''),
-    password_confirmation: new FormControl(''),
-    city: new FormControl(''),
+    name: new FormControl("", { validators: [Validators.required] }),
+    email: new FormControl("", { validators: [Validators.required, Validators.email] }),
+    mobile_number: new FormControl("", { validators: [Validators.required] }),
+    password: new FormControl("", { validators: [Validators.required] }),
+    password_confirmation: new FormControl("", { validators: [Validators.required] }),
+    city: new FormControl("", { validators: [Validators.required] }),
   });
 
   registerUser() {
-    this.authService.register(this.registerForm.value as RegisterUserRequest)
-      .subscribe({
-        next: () => console.log('success'),
+    // validation errors if user submit early
+    if (this.registerForm.invalid) {
+      this.registerForm.markAllAsTouched();
+      return;
+    }
+
+    this.authService.register(this.registerForm.value as RegisterUserRequest).subscribe({
+      next: () => console.log("success"),
       error: (error) => {
         const errors: Record<number, string[]> = error?.error?.errors || {};
         const errorMessages: string[] = Object.values(errors).flat();
         this.errors.set(errorMessages);
-        }
+      },
     });
   }
-
-
 }

src/app/shared/components/error/error.ts

@@ -0,0 +1,47 @@
+import { Component, Input } from "@angular/core";
+import { AbstractControl } from "@angular/forms";
+import { UpperCaseFirstPipe } from "../../pipes/upper-case-first-pipe";
+
+@Component({
+  selector: "app-error",
+  imports: [UpperCaseFirstPipe],
+  template: `
+    @if (this.control && this.control.touched) {
+      @for (error of getErrorMessages(); track error) {
+        <p class="ml-2 text-xs text-red-400">{{ error | upperCaseFirst }}</p>
+      }
+    }
+  `,
+})
+export class Error {
+  @Input() control!: AbstractControl | null;
+  @Input() fieldName = "This field";
+
+  getErrorMessages() {
+    const messages: string[] = [];
+
+    if (this.control && this.control.errors) {
+      const errors = this.control.errors;
+
+      if (errors["required"]) {
+        messages.push(`${this.fieldName} is required.`);
+      }
+      if (errors["email"]) {
+        messages.push(`Please enter a valid email address.`);
+      }
+      if (errors["minlength"]) {
+        messages.push(
+          `${this.fieldName} must be at least ${errors["minlength"].requiredLength} characters.`,
+        );
+      }
+      if (errors["pattern"]) {
+        messages.push(`${this.fieldName} is formatted incorrectly.`);
+      }
+      if (errors["serverError"]) {
+        messages.push(errors["serverError"]);
+      }
+    }
+
+    return messages;
+  }
+}

src/app/shared/pipes/upper-case-first-pipe.spec.ts

@@ -0,0 +1,8 @@
+import { UpperCaseFirstPipe } from "./upper-case-first-pipe";
+
+describe("UpperCaseFirstPipe", () => {
+  it("create an instance", () => {
+    const pipe = new UpperCaseFirstPipe();
+    expect(pipe).toBeTruthy();
+  });
+});

src/app/shared/pipes/upper-case-first-pipe.ts

@@ -0,0 +1,10 @@
+import { Pipe, PipeTransform } from "@angular/core";
+
+@Pipe({
+  name: "upperCaseFirst",
+})
+export class UpperCaseFirstPipe implements PipeTransform {
+  transform(value: string): unknown {
+    return value.charAt(0).toUpperCase() + value.slice(1);
+  }
+}

src/styles.css

@@ -21,7 +21,7 @@ body {
 }
 
 .btn {
-  @apply rounded-full transition-all duration-200 font-medium ease-out flex justify-center active:translate-y-[1px];
+  @apply rounded-full transition-all duration-200 font-medium ease-out flex justify-center active:translate-y-px disabled:opacity-50 disabled:cursor-not-allowed;
 }
 
 .btn-ghost {