start of interface with jQuery for DOM impl

packages/ui/backend.js

@@ -0,0 +1,43 @@
+UI = {};
+
+if (Meteor.isClient) {
+
+  // XXX in the future, make the jQuery adapter a separate
+  // package and make the choice of back-end library
+  // configurable.  Adapters all expose the DomBackend interface.
+
+  if (! Package.jquery)
+    throw new Error("Meteor UI jQuery adapter: jQuery not found.");
+
+  var $ = Package.jquery.jQuery;
+
+  var DomBackend = {
+    parseHTML: function (html) {
+      // Return an array of nodes.
+      //
+      // jQuery does fancy stuff like creating an appropriate
+      // container element and setting innerHTML on it, as well
+      // as working around various IE quirks.
+      return $.parseHTML(html);
+    },
+    watchElement: function (elem) {
+      $(elem).on('meteor_ui_domrange_gc', $.noop);
+    },
+    // Called when an element is removed from the DOM using the
+    // back-end library directly, either by removing it directly
+    // or by removing a parent.
+    //
+    // To use this, override it (set it).
+    onRemoveElement: function (elem) {}
+  };
+
+  // See http://bugs.jquery.com/ticket/12213#comment:23
+  $.event.special.meteor_ui_domrange_gc = {
+    teardown: function() {
+      DomBackend.onRemoveElement(this);
+    }
+  };
+
+  UI.DomBackend = DomBackend;
+
+}

packages/ui/domrange.js

@@ -1,4 +1,3 @@
-UI = {};
 
 var removeNode = function (n) {
 //  if (n.nodeType === 1 &&

packages/ui/package.js

@@ -11,7 +11,8 @@ Package.on_use(function (api) {
   api.use('ordered-dict');
   api.use('minimongo');  // for idStringify
 
-  api.add_files(['domrange.js']);
+  api.add_files(['backend.js',
+                 'domrange.js']);
 });
 
 Package.on_test(function (api) {