Add “Load from metadata” feature to Geolocation input

views/shared/css/geolocation-marker.css

@@ -10,6 +10,13 @@
 button#geolocation_find_location_by_address {
     float: none;
 }
+#geolocation_metadata_select {
+    width: 80%;
+}
+#geolocation_metadata_select_label {
+    font-weight: bold;
+    margin-right: 5px;
+}
 
 div#geolocation {
     clear: both;

views/shared/map/input-partial.php

@@ -8,6 +8,22 @@
 <input type="hidden" name="geolocation[zoom_level]" value="<?php echo $zoom; ?>">
 <input type="hidden" name="geolocation[map_type]" value="Leaflet">
 
+<?php
+$metadata = [];
+
+if (($item = get_current_record('Item')) instanceof Item) {
+    $texts = $item->getAllElementTexts();
+
+    foreach ($texts as $textRecord) {
+        $element = $item->getElementById($textRecord->element_id);
+        // Build a label like "Title: My Item Title" and store it in the metadata array:
+        $metadata[] = sprintf('%s: %s', $element->name, substr($tmp = $textRecord->text, 0, 40) . (strlen($tmp) > 40 ? '...' : ''));
+    }
+
+    $metadata = array_unique($metadata);
+}
+?>
+
 <div class="field">
     <div id="location_form" class="two columns alpha">
         <label for="geolocation_address"><?php echo html_escape($label); ?></label>
@@ -16,7 +32,22 @@
         <input type="text" name="geolocation[address]" id="geolocation_address" value="<?php echo $address; ?>">
         <button type="button" name="geolocation_find_location_by_address" id="geolocation_find_location_by_address" data-success-message="<?php echo __('Location found.'); ?>"><?php echo __('Find'); ?></button>
     </div>
+
+    <div class="two columns alpha">
+        <label id="geolocation_metadata_select_label" for="geolocation_metadata_select"><?php echo __('Get location from metadata:');?></label>
+    </div>
+    <div class="inputs five columns omega">
+        <select id="geolocation_metadata_select">
+            <?php foreach ($metadata as $md): ?>
+            <option value="<?php echo html_escape($md); ?>">
+                <?php echo html_escape($md); ?>
+            </option>
+            <?php endforeach; ?>
+        </select>
+        <button type="button" id="geolocation_metadata_load_btn"><?php echo __('Load');?></button>
+    </div>
 </div>
+
 <div id="geolocation-sr-alerts" class="sr-only" aria-live="polite" aria-atomic="true"></div>
 <div id="omeka-map-form" class="geolocation-map"></div>
 
@@ -57,5 +88,20 @@
             jQuery('#geolocation_find_location_by_address').click();
         }
     });
+
+    // Make the metadata load button set the hidden form fields the plugin uses.
+    jQuery('#geolocation_metadata_load_btn').on('click', function (event) {
+        event.preventDefault();
+
+        // Get the raw selected option text, e.g. "Title: My Awesome Place"
+        var selected = jQuery('#geolocation_metadata_select').val();
+        if (!selected) return;
+
+        // Split off the part after the first ": "
+        var parts = selected.split(': ');
+        var address = parts.slice(1).join(': ');
+
+        jQuery('#geolocation_address').val(address).trigger('change');
+    });
 });
 </script>