[launch week] Add submission form on the UI

src/pages/FormSubmission.tsx

@@ -0,0 +1,70 @@
+interface CustomFormData {
+  name: string
+  email: string
+  phoneNumber: string
+}
+
+const handleSubmit = (event: Event): void => {
+  event.preventDefault()
+
+  const form = event.target as HTMLFormElement
+  const formData: CustomFormData = {
+    name: (form.elements.namedItem('name') as HTMLInputElement).value,
+    email: (form.elements.namedItem('email') as HTMLInputElement).value,
+    phoneNumber: (form.elements.namedItem('phone') as HTMLInputElement).value,
+  }
+
+  const errors = validateFormData(formData)
+
+if (errors.length > 0) {
+    displayErrors(errors)
+  } else {
+    submitForm(formData)
+    displaySuccessMessage('Form submitted successfully!')
+  }
+  } catch (error) {
+    displayErrorMessage('Failed to submit the form.')
+  }
+}
+
+const validateFormData = (data: CustomFormData): string[] => {
+  const errors: string[] = []
+
+  if (!data.name.trim()) {
+    errors.push('Name is required.')
+  }
+
+  if (!data.email.trim()) {
+    errors.push('Email is required.')
+  } else if (!validateEmail(data.email)) {
+    errors.push('Email is invalid.')
+  }
+
+  return errors
+}
+
+const validateEmail = (email: string): boolean => {
+  const emailPattern = /^[^\s@]+@[^\s@]+\.[^\s@]+$/
+  return emailPattern.test(email)
+}
+
+const submitForm = (data: CustomFormData): void => {
+  console.log('Submitting form:', data)
+}
+
+const displayErrors = (errors: string[]): void => {
+  console.error('Form errors:', errors)
+}
+
+const displaySuccessMessage = (message: string): void => {
+  console.log(message)
+}
+
+const displayErrorMessage = (message: string): void => {
+  console.error(message)
+}
+
+const form = document.querySelector('form')
+if (form) {
+  form.addEventListener('submit', handleSubmit)
+}