thekid/Reactive.class.php

## Reactive.class.php
<?php

use web\Application;
use web\frontend\{Frontend, Handlebars, Get, Post, Delete, Param, View};

class Reactive extends Application {

  public function routes() {
    $impl= new class() {
      private $list= ['One', 'Two'];

      #[Get]
      public function view() {
        return View::named('reactive')->with(['items' => $this->list]);
      }

      #[Post('/fragment/listing')]
      public function add(#[Param] $name) {
        $this->list[]= $name;
        return View::named('reactive')->fragment('listing')->with(['items' => $this->list]);
      }

      #[Delete('/fragment/listing')]
      public function remove(#[Param] $id) {
        unset($this->list[$id]);
        return View::named('reactive')->fragment('listing')->with(['items' => $this->list]);
      }
    };
    return new Frontend($impl, new Handlebars('.'));
  }
}

## reactive.handlebars
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Reactive</title>
  <link href="https://fonts.googleapis.com/css2?family=Lato:wght@300&display=swap" rel="stylesheet">
  <style type="text/css">
    * {
      font-family: 'Lato', sans-serif;
    }
  </style>
</head>
<body>
  <h1>Look at this list 😊</h1>

  <ul id="list" hx-target="#list">
    {{#*fragment "listing"}}
      {{#each items}}
        <li>{{.}} <button hx-delete="/fragment/listing?id={{@index}}">x</button></li>
      {{/each}}
    {{/fragment}}
  </ul>

  <form>
    <input type="text" name="name">
    <button name="add" hx-post="/fragment/listing" hx-target="#list">Add</button>
  </form>

  <script src="https://unpkg.com/htmx.org@1.9.4/dist/htmx.min.js"></script>
  <script type="module">
    // Clear value after entry
    const $form = document.forms[0];
    $form.elements['add'].addEventListener('click', e => {
      setTimeout(() => $form.elements['name'].value = '');
    });
  </script>
</body>
</html>
	<?php

	use web\Application;
	use web\frontend\{Frontend, Handlebars, Get, Post, Delete, Param, View};

	class Reactive extends Application {

	public function routes() {
	$impl= new class() {
	private $list= ['One', 'Two'];

	#[Get]
	public function view() {
	return View::named('reactive')->with(['items' => $this->list]);
	}

	#[Post('/fragment/listing')]
	public function add(#[Param] $name) {
	$this->list[]= $name;
	return View::named('reactive')->fragment('listing')->with(['items' => $this->list]);
	}

	#[Delete('/fragment/listing')]
	public function remove(#[Param] $id) {
	unset($this->list[$id]);
	return View::named('reactive')->fragment('listing')->with(['items' => $this->list]);
	}
	};
	return new Frontend($impl, new Handlebars('.'));
	}
	}
	<!DOCTYPE html>
	<html>
	<head>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<title>Reactive</title>
	<link href="https://fonts.googleapis.com/css2?family=Lato:wght@300&display=swap" rel="stylesheet">
	<style type="text/css">
	* {
	font-family: 'Lato', sans-serif;
	}
	</style>
	</head>
	<body>
	<h1>Look at this list 😊</h1>

	<ul id="list" hx-target="#list">
	{{#*fragment "listing"}}
	{{#each items}}
	<li>{{.}} <button hx-delete="/fragment/listing?id={{@index}}">x</button></li>
	{{/each}}
	{{/fragment}}
	</ul>

	<form>
	<input type="text" name="name">
	<button name="add" hx-post="/fragment/listing" hx-target="#list">Add</button>
	</form>

	<script src="https://unpkg.com/htmx.org@1.9.4/dist/htmx.min.js"></script>
	<script type="module">
	// Clear value after entry
	const $form = document.forms[0];
	$form.elements['add'].addEventListener('click', e => {
	setTimeout(() => $form.elements['name'].value = '');
	});
	</script>
	</body>
	</html>