--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/web/static/admin/js/prepopulate.js	Tue Jun 08 01:16:35 2010 +0200
@@ -0,0 +1,34 @@
+(function($) {
+    $.fn.prepopulate = function(dependencies, maxLength) {
+        /*
+            Depends on urlify.js
+            Populates a selected field with the values of the dependent fields,
+            URLifies and shortens the string. 
+            dependencies - selected jQuery object of dependent fields
+            maxLength - maximum length of the URLify'd string 
+        */
+        return this.each(function() {
+            var field = $(this);
+
+            field.data('_changed', false);
+            field.change(function() {
+                field.data('_changed', true);
+            });
+
+            var populate = function () {
+                // Bail if the fields value has changed
+                if (field.data('_changed') == true) return;
+ 
+                var values = [];
+                dependencies.each(function() {
+                    if ($(this).val().length > 0) {
+                        values.push($(this).val());
+                    }
+                });
+                field.val(URLify(values.join(' '), maxLength));
+            };
+
+            dependencies.keyup(populate).change(populate).focus(populate);
+        });
+    };
+})(django.jQuery);