This patch fix Slider Price in module "better_exposed_filters" drupal 8

gistfile1.txt

diff --git a/better_exposed_filters.module b/better_exposed_filters.module
index 3d67a71..446d726 100644
--- a/better_exposed_filters.module
+++ b/better_exposed_filters.module
@@ -246,8 +246,9 @@ function better_exposed_filters_element_validate_slider_animate($element, &$form
  */
 function better_exposed_filters_element_validate_slider_min_max($element, &$form_state) {
   $value = $element['#value'];
-  $slider_min = $form_state['values']['exposed_form_options']['bef'][$element['#bef_filter_id']]['slider_options']['bef_slider_min'];
-  $slider_max = $form_state['values']['exposed_form_options']['bef'][$element['#bef_filter_id']]['slider_options']['bef_slider_max'];
+
+  $slider_min = $form_state->getValue('exposed_form_options')['bef'][$element['#bef_filter_id']]['slider_options']['bef_slider_min'];
+  $slider_max = $form_state->getValue('exposed_form_options')['bef'][$element['#bef_filter_id']]['slider_options']['bef_slider_max'];
 
   if ($value !== '' && _better_exposed_filters_slider_selected($element, $form_state)) {
     // Must not have more than 11 decimal places.
@@ -271,8 +272,8 @@ function better_exposed_filters_element_validate_slider_step($element, &$form_st
   $value = $element['#value'];
 
   if ($value !== '' && _better_exposed_filters_slider_selected($element, $form_state)) {
-    $slider_min = $form_state['values']['exposed_form_options']['bef'][$element['#bef_filter_id']]['slider_options']['bef_slider_min'];
-    $slider_max = $form_state['values']['exposed_form_options']['bef'][$element['#bef_filter_id']]['slider_options']['bef_slider_max'];
+    $slider_min = $form_state->getValue('exposed_form_options')['bef'][$element['#bef_filter_id']]['slider_options']['bef_slider_min'];
+    $slider_max = $form_state->getValue('exposed_form_options')['bef'][$element['#bef_filter_id']]['slider_options']['bef_slider_max'];
 
     // Must be positive.
     if ($value < 0) {
@@ -297,8 +298,8 @@ function better_exposed_filters_element_validate_slider_step($element, &$form_st
  */
 function _better_exposed_filters_slider_selected($element, &$form_state) {
   return (isset($element['#bef_filter_id']) &&
-          isset($form_state['values']['exposed_form_options']['bef'][$element['#bef_filter_id']]['bef_format']) &&
-          $form_state['values']['exposed_form_options']['bef'][$element['#bef_filter_id']]['bef_format'] == 'bef_slider');
+          isset($form_state->getValue('exposed_form_options')['bef'][$element['#bef_filter_id']]['bef_format']) &&
+          $form_state->getValue('exposed_form_options')['bef'][$element['#bef_filter_id']]['bef_format'] == 'bef_slider');
 }
 
 /**
diff --git a/js/bef_sliders.js b/js/bef_sliders.js
index 986e664..5a62039 100644
--- a/js/bef_sliders.js
+++ b/js/bef_sliders.js
@@ -4,12 +4,16 @@
  * Adds jQuery Slider functionality to an exposed filter.
  */
 (function ($) {
-  Drupal.behaviors.better_exposed_filters_slider = {
+
+  Drupal.behaviors.better_exposed_filters = {
     attach: function(context, settings) {
-      if (Drupal.settings.better_exposed_filters.slider) {
-        $.each(Drupal.settings.better_exposed_filters.slider_options, function(i, sliderOptions) {
+      if (drupalSettings.better_exposed_filters.slider) {
+
+        $.each(drupalSettings.better_exposed_filters.slider_options, function(i, sliderOptions) {
+
           // Only make one slider per filter.
-          $("#" + sliderOptions.viewId + " #edit-" + sliderOptions.id + "-wrapper").once('slider-filter', function() {
+
+          $("#" + sliderOptions.viewId + " #edit-" + sliderOptions.id + "-wrapper.slider-filter").each(function(e,index) {
             var $input = $(this).find('input[type=text]');
 
             // This is a "between" or "not between" filter with two values.
@@ -30,9 +34,8 @@
               // Set the element value in case we are using the slider min & max.
               $min.val(default_min);
               $max.val(default_max);
-
-              $min.parents('div.views-widget').after(
-                $('<div class="bef-slider"></div>').slider({
+                $(this).append(
+                    $('<div class="bef-slider"></div>').slider({
                   range: true,
                   min: parseFloat(sliderOptions.min, 10),
                   max: parseFloat(sliderOptions.max, 10),
diff --git a/src/Plugin/views/exposed_form/BetterExposedFilters.php b/src/Plugin/views/exposed_form/BetterExposedFilters.php
index 7747b6a..a34021a 100644
--- a/src/Plugin/views/exposed_form/BetterExposedFilters.php
+++ b/src/Plugin/views/exposed_form/BetterExposedFilters.php
@@ -10,7 +10,7 @@ namespace Drupal\better_exposed_filters\Plugin\views\exposed_form;
 use Drupal\views\Plugin\views\exposed_form\ExposedFormPluginBase;
 use Drupal\Core\Form\FormStateInterface;
 use Drupal\Core\Url;
-
+use Drupal\Component\Utility\Html;
 /**
  * Exposed form plugin that provides a basic exposed form.
  *
@@ -285,7 +285,7 @@ Title Desc|Z -> A</pre> Leave the replacement text blank to remove an option alt
 
       // The date filter handler extends the numeric filter handler so we have
       // to exclude it specifically.
-      if (is_a($filter, 'Drupal\views\Plugin\views\filter\Numeric') && !is_a($filter, 'Drupal\views\Plugin\views\filter\Date')) {
+      if (is_a($filter, 'Drupal\views\Plugin\views\filter\NumericFilter') && !is_a($filter, 'Drupal\views\Plugin\views\filter\Date')) {
         $bef_slider = TRUE;
       }
 
@@ -780,7 +780,6 @@ Off|No
           $form[$field_id]['#options'] = $this->cleanOptions($form[$field_id]['#options']);
         }
       }
-
       switch ($options['bef_format']) {
         case 'bef_datepicker':
           $show_apply = TRUE;
@@ -935,7 +934,7 @@ Off|No
           $bef_add_js = TRUE;
           $bef_add_css = TRUE;
           $bef_js['slider'] = TRUE;
-
+          $price_id = Html::getUniqueId($field_id);
           // Add js options for the slider for this filter.
           $bef_js['slider_options'][$field_id] = array(
             'min' => $options['slider_options']['bef_slider_min'],
@@ -943,9 +942,11 @@ Off|No
             'step' => $options['slider_options']['bef_slider_step'],
             'animate' => $options['slider_options']['bef_slider_animate'],
             'orientation' => $options['slider_options']['bef_slider_orientation'],
-            'id' => drupal_html_id($field_id),
+            'id' =>  $price_id,
             'viewId' => $form['#id'],
           );
+          $form[$field_id]['#type'] = 'fieldset';
+          $form[$field_id]['#attributes'] = array('id' => 'edit-'.$price_id.'-wrapper','class' => array('slider-filter'));
           break;
 
         case 'bef_links':
@@ -996,7 +997,7 @@ Off|No
                 '#title' => $form['#info']["filter-$label"]['label'] ?: '',
                 '#description' => $form['#info']["filter-$label"]['description'] ?: '',
                 // Needed to keep styling consistent with other exposed options.
-                '#attributes' => array('class' => 'form-item'),
+                '#attributes' => array('class' => array('form-item')),
               ],
             ];
             $form['#info']["filter-$label"]['label'] = '';
@@ -1007,6 +1008,7 @@ Off|No
           }
 
           // Render as either radio buttons or checkboxes.
+
           if (empty($form[$field_id]['#multiple'])) {
             // Single-select -- display as radio buttons.
             $form[$field_id]['#type'] = 'radios';
@@ -1074,19 +1076,21 @@ Off|No
     if ($bef_add_js) {
       // Add jQuery UI library code as needed.
       if ($bef_js['datepicker']) {
-        drupal_add_library('system', 'ui.datepicker');
+          $form['#attached']['library'][] = 'core/jquery.ui.datepicker';
       }
       if ($bef_js['slider']) {
-        drupal_add_library('system', 'ui.slider');
+          $form['#attached']['library'][] = 'core/jquery.ui.slider';
       }
 
-      drupal_add_js(array('better_exposed_filters' => $bef_js), 'setting');
-      drupal_add_js(drupal_get_path('module', 'better_exposed_filters') . '/better_exposed_filters.js');
+        $form['#attached']['drupalSettings']['better_exposed_filters'] = $bef_js;
+        $form['#attached']['library'][] = 'better_exposed_filters/sliders';
     }
+
     if ($bef_add_css) {
-      drupal_add_css(drupal_get_path('module', 'better_exposed_filters') . '/better_exposed_filters.css');
+        $form['#attached']['library'][] = 'better_exposed_filters/general';
     }
 
+
     // Check for secondary elements.
     if ($allow_secondary && !empty($secondary)) {
       // Add secondary elements after regular exposed filter elements.
@@ -1185,6 +1189,7 @@ Off|No
    * @return array
    *   The resulting settings array
    */
+
   protected function bef_set_defaults() {
     $count = func_num_args();
     if (!$count) {
@@ -1270,6 +1275,7 @@ Off|No
    * @return array
    *   Multi-dimensional settings array.
    */
+
   protected function bef_get_settings() {
     // General, sort, pagers, etc.
     $defaults = array(