Let's Create a Contact Form
***************************

.[perex]
Let's take a look at how to create a contact form in Nette, including sending it to an email. So let's do it!

First we have to create a new project. As the [Getting Started |nette:installation] page explains. And then we can start creating the form.

The easiest way is to create the [form directly in Presenter |forms:in-presenter]. We can use the pre-made `HomePresenter`. We will add the `contactForm` component representing the form. We do this by writing the `createComponentContactForm()` factory method into the code that will produce the component:

```php
use Nette\Application\UI\Form;
use Nette\Application\UI\Presenter;

class HomePresenter extends Presenter
{
	protected function createComponentContactForm(): Form
	{
		$form = new Form;
		$form->addText('name', 'Name:')
			->setRequired('Enter your name');
		$form->addEmail('email', 'E-mail:')
			->setRequired('Enter your e-mail');
		$form->addTextarea('message', 'Message:')
			->setRequired('Enter message');
		$form->addSubmit('send', 'Send');
		$form->onSuccess[] = [$this, 'contactFormSucceeded'];
		return $form;
	}

	public function contactFormSucceeded(Form $form, $data): void
	{
		// sending an email
	}
}
```

As you can see, we have created two methods. The first method `createComponentContactForm()` creates a new form. This has fields for name, email and message, which we add using the `addText()`, `addEmail()` and `addTextArea()` methods. We also added a button to submit the form.
But what if the user doesn't fill in some fields? In that case, we should let him know that it is a required field. We did this with the `setRequired()` method.
Finally, we also added an [event |nette:glossary#events] `onSuccess`, which is triggered if the form is submitted successfully. In our case, it calls the `contactFormSucceeded` method , which takes care of processing the submitted form. We'll add that to the code in a moment.

Let the `contantForm` component be rendered in the `Home/default.latte` template:

```latte
{block content}
<h1>Contant Form</h1>
{control contactForm}
```

To send the email itself, we create a new class called `ContactFacade` and place it in the `app/Model/ContactFacade.php` file:

```php
<?php
declare(strict_types=1);

namespace App\Model;

use Nette\Mail\Mailer;
use Nette\Mail\Message;

class ContactFacade
{
	public function __construct(
		private Mailer $mailer,
	) {
	}

	public function sendMessage(string $email, string $name, string $message): void
	{
		$mail = new Message;
		$mail->addTo('admin@example.com') // your email
			->setFrom($email, $name)
			->setSubject('Message from the contact form')
			->setBody($message);

		$this->mailer->send($mail);
	}
}
```

The `sendMessage()` method will create and send the email. It uses a so-called mailer to do this, which it passes as a dependency via the constructor. Read more about [sending emails |mail:].

Now, we'll go back to the presenter and complete the `contactFormSucceeded()` method. It calls the `sendMessage()` method of the `ContactFacade` class and passes it the form data. And how do we get the `ContactFacade` object ? We'll have it passed to us by the constructor:

```php
use App\Model\ContactFacade;
use Nette\Application\UI\Form;
use Nette\Application\UI\Presenter;

class HomePresenter extends Presenter
{
	public function __construct(
		private ContactFacade $facade,
	) {
	}

	protected function createComponentContactForm(): Form
	{
		// ...
	}

	public function contactFormSucceeded(stdClass $data): void
	{
		$this->facade->sendMessage($data->email, $data->name, $data->message);
		$this->flashMessage('The message has been sent');
		$this->redirect('this');
	}
}
```

After the email is sent, we show the user the so-called [flash message |application:components#flash-messages], confirming that the message has been sent, and then redirect to the next page so that the form cannot be resubmitted using *refresh* in the browser.


Well, if everything works, you should be able to send an email from your contact form. Congratulations!


HTML Email Template
-------------------

For now, a plain text email containing only the message sent by the form is sent. But we can use HTML in the email and make it more attractive. We will create a template for it in Latte, which we will save into `app/Model/contactEmail.latte`:

```latte
<html>
	<title>Message from the contact form</title>

	<body>
		<p><strong>Name:</strong> {$name}</p>
		<p><strong>E-mail:</strong> {$email}</p>
		<p><strong>Message:</strong> {$message}</p>
	</body>
</html>
```

It remains to modify `ContactFacade` to use this template. In the constructor, we request the `LatteFactory` class, which can produce the `Latte\Engine` object, a [Latte template renderer |latte:develop#how-to-render-a-template]. We use the `renderToString()` method to render the template to a file, the first parameter is the path to the template and the second is the variables.

```php
namespace App\Model;

use Nette\Bridges\ApplicationLatte\LatteFactory;
use Nette\Mail\Mailer;
use Nette\Mail\Message;

class ContactFacade
{
	public function __construct(
		private Mailer $mailer,
		private LatteFactory $latteFactory,
	) {
	}

	public function sendMessage(string $email, string $name, string $message): void
	{
		$latte = $this->latteFactory->create();
		$body = $latte->renderToString(__DIR__ . '/contactEmail.latte', [
			'email' => $email,
			'name' => $name,
			'message' => $message,
		]);

		$mail = new Message;
		$mail->addTo('admin@example.com') // your email
			->setFrom($email, $name)
			->setHtmlBody($body);

		$this->mailer->send($mail);
	}
}
```

We then pass the generated HTML email to the `setHtmlBody()` method instead of the original `setBody()`. We also don't need to specify the subject of the email in `setSubject()`, because the library takes it from the element `<title>` in template.


Configuring
-----------

In the `ContactFacade` class code, our admin email `admin@example.com` is still hardcoded. It would be better to move it to the configuration file. How to do it?

First, we modify the `ContactFacade` class and replace the email string with a variable passed by the constructor:

```php
class ContactFacade
{
	public function __construct(
		private Mailer $mailer,
		private LatteFactory $latteFactory,
		private string $adminEmail,
	) {
	}

	public function sendMessage(string $email, string $name, string $message): void
	{
		// ...
		$mail = new Message;
		$mail->addTo($this->adminEmail)
			->setFrom($email, $name)
			->setHtmlBody($body);
		// ...
	}
}
```

And the second step is to put the value of this variable in the configuration. In the `app/config/services.neon` file we add:

```neon
services:
	- App\Model\ContactFacade(adminEmail: admin@example.com)
```

And that's it. If there are a lot of items in the `services` section and you feel like the email is getting lost among them, we can make it a variable. We'll modify the entry to:

```neon
services:
	- App\Model\ContactFacade(adminEmail: %adminEmail%)
```

And define this variable in the `app/config/common.neon` file:

```neon
parameters:
	adminEmail: admin@example.com
```

And it's done!


{{sitename: Best Practices}}