Only pass the leaflet hash param to the loadLayer function.

assets/maps/contao-leaflet.js

@@ -25,7 +25,6 @@ L.Contao = new (L.Class.extend({
         L.Icon.Default.imagePath = 'assets/leaflet/libs/leaflet/images';
 
         this.setGeoJsonListeners(L.GeoJSON);
-        this.setGeoJsonListeners(L.GeoJSON.AJAX);
     },
 
     /**
@@ -108,13 +107,14 @@ L.Contao = new (L.Class.extend({
     /**
      * Layer a url into a layer using omnivore.
      *
-     * @param url         The url being loaded.
+     * @param hash        The leaflet url hash.
      * @param type        The response content format.
      * @param options     Parser options
      * @param customLayer optional custom layer.
      * @param map         Pass a map object so that the data loading events are passed to the map.
      */
-    loadLayer: function(url, type, options, customLayer, map) {
+    loadLayer: function(hash, type, options, customLayer, map) {
+        var url   = this.createRequestUrl(hash);
         var layer = omnivore[type](url, options, customLayer);
 
         if (map) {
@@ -224,5 +224,39 @@ L.Contao = new (L.Class.extend({
                 onEachFeature: this.onEachFeature.bind(this)
             };
         }
+    },
+
+    /**
+     * Create request url by appending the hash to the current url.
+     *
+     * @param {string} value The hash
+     *
+     * @returns {string}
+     */
+    createRequestUrl: function(value) {
+        value = encodeURIComponent(value);
+
+        var key    = 'leaflet';
+        var params = document.location.search.substr(1).split('&');
+
+        if (params == '') {
+            return document.location.pathname + '?' + [key, value].join('=');
+        } else {
+            var i = params.length; var x; while (i--) {
+                x = params[i].split('=');
+
+                if (x[0] == key) {
+                    x[1] = value;
+                    params[i] = x.join('=');
+                    break;
+                }
+            }
+
+            if (i < 0) {
+                params[params.length] = [key, value].join('=');
+            }
+
+            return document.location.pathname + params.join('&');
+        }
     }
 }))();

src/Netzmacht/Contao/Leaflet/Frontend/RequestUrl.php

@@ -11,32 +11,44 @@
 
 namespace Netzmacht\Contao\Leaflet\Frontend;
 
-use ContaoCommunityAlliance\UrlBuilder\UrlBuilder;
-
 /**
  * Class RequestUrl creates the request url.
  *
  * @package Netzmacht\Contao\Leaflet\Request
  */
-class RequestUrl
+class RequestUrl implements \JsonSerializable
 {
-    const BASE = 'assets/leaflet/maps/data.php';
-
+    /**
+     * The for param is the identifier to the responsible frontend module or content element.
+     *
+     * @var string
+     */
     private static $for;
 
-    public static function setFor($for)
-    {
-        static::$for = $for;
-    }
+    /**
+     * The leaflet hash.
+     *
+     * @var string
+     */
+    private $hash;
+
+    /**
+     * The request url as url path.
+     *
+     * @var string
+     */
+    private $url;
 
     /**
      * Create the request url.
      *
+     * It combines the params and creates an hash for it.
+     *
      * @param int         $dataId The data object id.
      * @param string|null $type   Object type. If empty it assumes a layer.
      * @param string|null $format Data format. If empty it assumes geojson.
      *
-     * @return string
+     * @return RequestUrl
      */
     public static function create($dataId, $type = null, $format = null)
     {
@@ -47,8 +59,69 @@ class RequestUrl
             'format' => $format != 'geojson' ? $format: null
         );
 
-        $param = base64_encode(implode(',', $params));
+        $hash = base64_encode(implode(',', $params));
+        $url  = \Config::get('websitePath') . '/' . \Frontend::addToUrl('leaflet=' . $hash, false);
 
-        return \Config::get('websitePath') . '/' . \Frontend::addToUrl('leaflet=' . $param, false);
+        return new static($url, $hash);
+    }
+
+    /**
+     * Set the for param.
+     *
+     * @param $for
+     */
+    public static function setFor($for)
+    {
+        static::$for = $for;
+    }
+
+    /**
+     * Construct.
+     *
+     * @param string $url  The request url.
+     * @param string $hash The leaflet hash.
+     */
+    public function __construct($url, $hash)
+    {
+        $this->url  = $url;
+        $this->hash = $hash;
+    }
+
+    /**
+     * Get the leaflet url hash.
+     *
+     * @return string
+     */
+    public function getHash()
+    {
+        return $this->hash;
+    }
+
+    /**
+     * Get the whole url.
+     *
+     * @return string
+     */
+    public function getUrl()
+    {
+        return ;
+    }
+
+    /**
+     * Convert to string will always return the whole url.
+     *
+     * @return string
+     */
+    public function __toString()
+    {
+        return $this->getUrl();
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    function jsonSerialize()
+    {
+        return $this->getUrl();
     }
 }

src/Netzmacht/Contao/Leaflet/Subscriber/EncoderSubscriber.php

@@ -11,6 +11,7 @@
 
 namespace Netzmacht\Contao\Leaflet\Subscriber;
 
+use Netzmacht\Contao\Leaflet\Frontend\RequestUrl;
 use Netzmacht\Javascript\Encoder;
 use Netzmacht\Javascript\Event\EncodeValueEvent;
 use Netzmacht\Javascript\Event\GetReferenceEvent;
@@ -76,11 +77,17 @@ class EncoderSubscriber implements EventSubscriberInterface
         $ref     = $encoder->encodeReference($value);
 
         if ($value instanceof OmnivoreLayer) {
+            $url = $value->getUrl();
+
+            if ($url instanceof RequestUrl) {
+                $url = $url->getHash();
+            }
+
             $event->addLine(
                 sprintf(
                     '%s = L.Contao.loadLayer(%s, %s, %s, %s, map);',
                     $ref,
-                    $encoder->encodeValue($value->getUrl()),
+                    $encoder->encodeValue($url),
                     $encoder->encodeValue(strtolower(str_replace('Omnivore.', '', $value->getType()))),
                     $encoder->encodeValue($value->getOptions()),
                     $this->encodeCustomLayer($value, $encoder)