Add should-be-present behavior

behavior.should_be_present.js

@@ -0,0 +1,16 @@
+/**
+ * Fires "validation:failed" on a document, 
+ * when any form that has "blank" fields 
+ * with class "should-be-present" is submitted
+ *
+ * Passes "failed" elements as "elements" property on event's memo
+ *
+ **/
+document.observe('submit', function(e) {
+  var required = e.target.select('.should-be-present')
+    .findAll(function(el) { return $F(el).blank() })
+  if (required.length) {
+    e.stop();
+    document.fire('validation:failed', { elements: required });
+  }
+})

form.element.methods.js

@@ -1,10 +1,10 @@
 /**
- * Are any of the form fields empty?
+ * Returns true when element's value is "blank" (consists of 0 or more whitespaces)
  *
  */
-Field.Methods.isEmpty = function(element) {
-  return $(element).getElements().any(Element.present);
-};
+Field.Methods.isBlank = function(element) {
+  return $F(element).blank();
+}
 
 /**
  * Boosts Field#present to work somewhat more reasonably