Fixed a bug where lat/long may not get displayed in some browsers bec…

…ause of a numeric conversion issue.

static/js/main.js

@@ -135,14 +135,16 @@ function initVideo(info) {
 
     let video_location = metadata.location ?? {};
     let latitude = video_location.latitude ?? undefined;
+    let latitude_input_value = convertCoordinatesForInput(latitude);
     let longitude = video_location.longitude ?? undefined;
+    let longitude_input_value = convertCoordinatesForInput(longitude);
 
     window.shark.info['video'] = {
         id: info.video_id,
         name: name,
         start_time: start_time,
-        latitude: latitude,
-        longitude: longitude,
+        latitude: latitude_input_value,
+        longitude: longitude_input_value,
     };
 
     window.shark.info['key_metadata'] = info.key_metadata;
@@ -175,14 +177,14 @@ function initVideo(info) {
                 <input type='number' name='latitude' step='0.01'
                         data-video-id='${info.video_id}'
                         onchange='editVideo(this, "latitude")'
-                        value='${latitude}' />
+                        value='${latitude_input_value}' />
             </div>
             <div>
                 <label for='longitude'>Longitude:</label>
                 <input type='number' name='longitude' step='0.01'
                         data-video-id='${info.video_id}'
                         onchange='editVideo(this, "longitude")'
-                        value='${longitude}' />
+                        value='${longitude_input_value}' />
             </div>
         </div>
     `;
@@ -419,6 +421,15 @@ function convertUnixSecsForInput(unixSeconds) {
     return offsetDate.toISOString().slice(0, 19);
 }
 
+function convertCoordinatesForInput(coordinates) {
+    if (!coordinates) {
+        return undefined;
+    }
+
+    // Remove the leading + from coordinates.
+    return coordinates.replace(/^\+/, '');
+}
+
 // Fetch the server's version and add it to the page's title.
 function fetchVersion() {
     let promise = fetch('/version', {