update with changes from Production branch

app/assets/javascripts/nested_form.js

@@ -0,0 +1,114 @@
+(function($) {
+  window.NestedFormEvents = function() {
+    this.addFields = $.proxy(this.addFields, this);
+    this.removeFields = $.proxy(this.removeFields, this);
+  };
+
+  NestedFormEvents.prototype = {
+    addFields: function(e) {
+      // Setup
+      var link      = e.currentTarget;
+      var assoc     = $(link).data('association');                // Name of child
+      var blueprint = $('#' + $(link).data('blueprint-id'));
+      var content   = blueprint.data('blueprint');                // Fields template
+
+      // Make the context correct by replacing <parents> with the generated ID
+      // of each of the parent objects
+      var context = ($(link).closest('.fields').closestChild('input, textarea, select').eq(0).attr('name') || '').replace(new RegExp('\[[a-z_]+\]$'), '');
+
+      // context will be something like this for a brand new form:
+      // project[tasks_attributes][1255929127459][assignments_attributes][1255929128105]
+      // or for an edit form:
+      // project[tasks_attributes][0][assignments_attributes][1]
+      if (context) {
+        var parentNames = context.match(/[a-z_]+_attributes(?=\]\[(new_)?\d+\])/g) || [];
+        var parentIds   = context.match(/[0-9]+/g) || [];
+
+        for(var i = 0; i < parentNames.length; i++) {
+          if(parentIds[i]) {
+            content = content.replace(
+              new RegExp('(_' + parentNames[i] + ')_.+?_', 'g'),
+              '$1_' + parentIds[i] + '_');
+
+            content = content.replace(
+              new RegExp('(\\[' + parentNames[i] + '\\])\\[.+?\\]', 'g'),
+              '$1[' + parentIds[i] + ']');
+          }
+        }
+      }
+
+      // Make a unique ID for the new child
+      var regexp  = new RegExp('new_' + assoc, 'g');
+      var new_id  = this.newId();
+      content     = $.trim(content.replace(regexp, new_id));
+
+      var field = this.insertFields(content, assoc, link);
+      // bubble up event upto document (through form)
+      field
+        .trigger({ type: 'nested:fieldAdded', field: field })
+        .trigger({ type: 'nested:fieldAdded:' + assoc, field: field });
+      return false;
+    },
+    newId: function() {
+      return new Date().getTime();
+    },
+    insertFields: function(content, assoc, link) {
+      var target = $(link).data('target');
+      if (target) {
+        return $(content).appendTo($(target));
+      } else {
+        return $(content).insertBefore(link);
+      }
+    },
+    removeFields: function(e) {
+      var $link = $(e.currentTarget),
+          assoc = $link.data('association'); // Name of child to be removed
+      
+      var hiddenField = $link.prev('input[type=hidden]');
+      hiddenField.val('1');
+      
+      var field = $link.closest('.fields');
+      field.hide();
+      
+      field
+        .trigger({ type: 'nested:fieldRemoved', field: field })
+        .trigger({ type: 'nested:fieldRemoved:' + assoc, field: field });
+      return false;
+    }
+  };
+
+  window.nestedFormEvents = new NestedFormEvents();
+  $(document)
+    .delegate('form a.add_nested_fields',    'click', nestedFormEvents.addFields)
+    .delegate('form a.remove_nested_fields', 'click', nestedFormEvents.removeFields);
+})(jQuery);
+
+// http://plugins.jquery.com/project/closestChild
+/*
+ * Copyright 2011, Tobias Lindig
+ *
+ * Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php)
+ * and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses.
+ *
+ */
+(function($) {
+        $.fn.closestChild = function(selector) {
+                // breadth first search for the first matched node
+                if (selector && selector != '') {
+                        var queue = [];
+                        queue.push(this);
+                        while(queue.length > 0) {
+                                var node = queue.shift();
+                                var children = node.children();
+                                for(var i = 0; i < children.length; ++i) {
+                                        var child = $(children[i]);
+                                        if (child.is(selector)) {
+                                                return child; //well, we found one
+                                        }
+                                        queue.push(child);
+                                }
+                        }
+                }
+                return $();//nothing found
+        };
+})(jQuery);