commit 297e19d1a9af897892e788fe96df7af545a41976
Author: Brückner Tamás <tamas.bruckner@integralvision.hu>
Date:   Thu Sep 11 17:01:12 2014 +0200

    Placeholder

diff --git a/better_exposed_filters_exposed_form_plugin.inc b/better_exposed_filters_exposed_form_plugin.inc
index cd87492..8e20cb9 100644
--- a/better_exposed_filters_exposed_form_plugin.inc
+++ b/better_exposed_filters_exposed_form_plugin.inc
@@ -500,6 +500,15 @@ Title Desc|Z -> A</pre> Leave the replacement value blank to remove an option al
         '#description' => t('Adds descriptive text to the exposed filter.  This is usually rendered in smaller print under the label or the options.'),
       );
 
+      // Build a placeholder option form element -- available to all exposed
+      // filters.
+      $bef_options[$label]['more_options']['bef_placeholder'] = array(
+        '#type' => 'textfield',
+        '#title' => t('Placeholder'),
+        '#default_value' => $existing[$label]['more_options']['bef_placeholder'],
+        '#description' => t('Adds placeholder HTML5 attribute for input element.'),
+      );
+
       // Add token support to the description field.
       $bef_options[$label]['more_options']['tokens'] = array(
         '#title' => t('Replacement patterns'),
@@ -913,6 +922,24 @@ Title Desc|Z -> A</pre> Leave the replacement value blank to remove an option al
         $form[$field_id]['#bef_description'] = $options['more_options']['bef_filter_description'];
       }
 
+      // Token replacement on BEF placeholder.
+      if (!empty($options['more_options']['bef_placeholder'])) {
+        // Collect replacement data.
+        $data = array();
+        $available = $options['more_options']['tokens']['available'];
+        if (in_array('vocabulary', $available)) {
+          $vocabs = taxonomy_get_vocabularies();
+          $data['vocabulary'] = $vocabs[$filters[$label]->options['vid']];
+        }
+        /* Others? */
+
+        // Replace tokens.
+        $options['more_options']['bef_placeholder'] = token_replace(
+          $options['more_options']['bef_placeholder'], $data
+        );
+        $form[$field_id]['#placeholder'] = $options['more_options']['bef_placeholder'];
+      }
+
       // Handle filter value rewrites.
       if (!empty($options['more_options']['rewrite']['filter_rewrite_values'])) {
         $lines = explode("\n", trim($options['more_options']['rewrite']['filter_rewrite_values']));