HtmxDetails.php

<?php

namespace alkemann\htmx;

class HtmxDetails
{

    protected $is_htmx_request;
    protected $is_boosted;
    protected $current_url;
    protected $prompt;
    protected $history_restore_request;
    protected $target;
    protected $trigger;
    protected $trigger_name;
    protected $triggering_event;


    /**
     * @param Closure $header callable that takes in a name (of http header) and a default value
     */
    public function __construct(\Closure $header)
    {
        $this->is_htmx_request = $header('HX-Request', false);
        $this->is_boosted = $header('HX-Boosted', false);
        $this->current_url = $header('HX-Current-URL', null);
        $this->prompt = $header('HX-Prompt', null);
        $this->history_restore_request = $header('HX-History-Restore-Request', false);
        $this->target = $header('HX-Target', null);
        $this->trigger = $header('HX-Trigger', null);
        $this->trigger_name = $header('HX-Trigger-Name', null);
        $this->triggering_event = json_decode($header('Triggering-Event', '[]'), true);
    }

    public function is(): bool
    {
        return $this->is_htmx_request;
    }

    /**
     * True if the request came from an element with the hx-boost attribute.
     */
    public function boosted(): bool
    {
        return $this->is_boosted;
        
    }

    // The current URL of the browser, or null for non-htmx requests.
    public function current_url(): string | null
    {
        return $this->current_url;
    }

    // The user response to hx-prompt if it was used, or null.
    public function prompt(): string | null
    {
        return $this->prompt;
    }

    // True if the request is for history restoration after a miss in the local history cache.
    public function history_restore_request(): bool
    {
        return $this->history_restore_request;
        
    }

    //The id of the target element if it exists, or null.
    public function target(): string | null
    {
        return $this->target;
    }

    // The id of the triggered element if it exists, or null.
    // Based on the HX-Trigger header.
    public function trigger(): string | null
    {
        return $this->trigger;
    }

    // The name of the triggered element if it exists, or null.
    // Based on the HX-Trigger-Name header.
    public function trigger_name(): string | null
    {
        return $this->trigger_name;
    }

    // The deserialized JSON representation of the event that 
    // triggered the request if it exists, or null. This header
    // is set by the event-header htmx extension, and contains
    // details of the DOM event that triggered the request.
    public function triggering_event(): array
    {
        return $this->triggering_event;
    }

}

slim_use_example.php

<?php
$app = new \Slim\App();

/**
 *
 * @param  \Psr\Http\Message\ServerRequestInterface $request  PSR7 request
 * @param  \Psr\Http\Message\ResponseInterface      $response PSR7 response
 * @param  callable                                 $next     Next middleware
 *
 * @return \Psr\Http\Message\ResponseInterface
 */
$app->add(function ($request, $response, $next) {
  $details = new alkemann\htmx\HtmxDetails(
    fn(string $name, $default = null) =>
      $request->hasHeader($name) ? $request->getHeader($name) : $default
  ); 
  $request = $request->withAttribute('htmx', $details);
  return $next($request, $response);
});