improve the perfromance of the javascript autocomplete lookup

This was performing poorly on large lists. The delay can be set down
very low because the list is stored entirely in memory. The current code
only does the lookup when there are >2 characters typed in for a
particular tag.

diff --git a/templates/dynamictags.inc.php b/templates/dynamictags.inc.php
index 51d12b94a356dfca524a0b9cbde056c78d802ba9..d7f094a5d377f79602cd5319671d9dfbde85d5e4 100644 (file)
--- a/templates/dynamictags.inc.php
+++ b/templates/dynamictags.inc.php
@@ -138,11 +138,16 @@ $( "#tags" )
     }
   })
   .autocomplete({
-    minLength: 0,
+    minLength: 2,
+    delay: 50,
     source: function( request, response ) {
-      // delegate back to autocomplete, but extract the last term
-      response( $.ui.autocomplete.filter(
-        availableTags, extractLast( request.term ) ) );
+      // if the term is >2 in legth delegate back to autocomplete
+      if (extractLast ( request.term ).length < 3) {
+        response( [] );
+      } else {
+        response( $.ui.autocomplete.filter(
+          availableTags, extractLast( request.term ) ) );
+      }
     },
     focus: function() {
       // prevent value inserted on focus