MINOR Moved jsparty/jquery/jquery_improvements.js to sapphire/javascript/jquery_improvements.js

git-svn-id: svn://svn.silverstripe.com/silverstripe/open/modules/sapphire/branches/2.4@93589 467b73ca-7a2a-4603-9d3b-597d59a354a9

javascript/jquery_improvements.js

@@ -0,0 +1,34 @@
+// play nice with prototype
+jQuery.noConflict();
+
+/**
+ * Clears the selected form elements.  Takes the following actions on the matched elements:
+ *  - input text fields will have their 'value' property set to the empty string
+ *  - select elements will have their 'selectedIndex' property set to -l. Normann change it from -1 to '', 
+ *    since set to -1, actually is not clearing the field, it change its value to null, and when submit the form the field belonged to,
+ *    the field value will be treated to a pure string "null", and this is not what it suppose to do.
+ *  - checkbox and radio inputs will have their 'checked' property set to false
+ *  - inputs of type submit, button, reset, and hidden will *not* be effected
+ *  - button elements will *not* be effected
+ *
+ * @example $('.myInputs').clearFields();
+ * @desc Clears all inputs with class myInputs
+ *
+ * @name clearFields
+ * @type jQuery
+ * @cat Plugins/Form
+ */
+(function($) {
+$.fn.clearFields = $.fn.clearInputs = function() {
+    return this.each(function() {
+        var t = this.type, tag = this.tagName.toLowerCase();
+        if (t == 'text' || t == 'password' || tag == 'textarea')
+            this.value = '';
+        else if (t == 'checkbox' || t == 'radio')
+            this.checked = false;
+        else if (tag == 'select')
+			//changed by Normann@silvestripe.com, see document above
+            this.selectedIndex = '';
+    });
+};
+})(jQuery);