1 files changed, 13 insertions, 1 deletions
diff --git a/firefox/jp-hash.js b/firefox/jp-hash.js
index 1072b4b..4eaa42d 100644
--- a/firefox/jp-hash.js
+++ b/firefox/jp-hash.js
@@ -100,6 +100,18 @@ async function jp_hash_edit(elem)
   if (elem.nodeType == 1 &&
       (elem.nodeName == "INPUT" || elem.nodeName == "TEXTAREA"))
   {
-    jphash(elem.value, (jph) => { elem.value = jph; });
+    let start = elem.selectionStart;
+    let end = elem.selectionEnd;
+
+    if (start != end) {
+      let len = elem.value.length;
+      let head = elem.value.substring(0, start);
+      let sel = elem.value.substring(start, end);
+      let tail = elem.value.substring(end, len);
+
+      jphash(sel, (jph) => { elem.value = head + jph + tail; });
+    } else {
+      jphash(elem.value, (jph) => { elem.value = jph; });
+    }
   }
 }