--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/static/js/forms.js	Wed Dec 22 02:52:25 2010 +0200
@@ -0,0 +1,61 @@
+/**
+ * jQuery support code for our forms
+ */
+
+(function($) {
+    /*
+     * When non-zero <select>/<option> is selected, apply that option as pre-filled values for other form items
+     */
+    $.fn.formSelectPreset = function (opts) {
+        opts = $.extend({
+            // which option value is the "default", i.e. 'create new'
+            valueDefault: 0,
+
+            // which element to apply selected option value (id) to
+            valueTarget: null,
+
+            // which element to apply selected option text to
+            textTarget: null,
+        }, opts);
+
+        this.change(function (event) {
+            // selected option value (i.e. id)
+            value = $(this).val();
+
+            // selected option text (i.e. title/name)
+            text = $.trim($(this).find("option:selected").text());
+
+            // fields to set
+            field_values = [
+                [ opts.valueTarget, value ],
+                [ opts.textTarget, text ]
+            ];
+
+            if (value == opts.valueDefault) {
+                // clear and re-enable fields
+                if (opts.valueTarget) {
+                    opts.valueTarget.removeAttr('disabled');
+                    opts.valueTarget.val("");
+                }
+
+                if (opts.textTarget) {
+                    opts.textTarget.removeAttr('disabled');
+                    opts.textTarget.val("");
+                }
+
+                return;
+            }
+
+            // set field values
+            if (opts.valueTarget) {
+                opts.valueTarget.attr('disabled', "disabled");
+                opts.valueTarget.val(value);
+            }
+
+            if (opts.textTarget) {
+                opts.textTarget.attr('disabled', "disabled");
+                opts.textTarget.val(text);
+            }
+        });
+    }
+})(jQuery);