I've done ExtJS and jQuery for the same project recently. Ext has a nice DataStore object for accessing remote data. And Ext has all those great "rich" compone

I've done ExtJS and jQuery for the same project recently. Ext has a nice DataStore object for accessing remote data. And Ext has all those great "rich" components. But I found it wasn't much more work to do my own components in jQuery. (Tree is very simple to implement in jQuery from scratch) The sense of control I have with jQuery is nice. The main code to handle my own trees: _.fn.toggleTreeNode = function(animate) { var node = this.filter('button'); if(animate) { node.siblings('ol').slideToggle(animate) } else { node.siblings('ol').toggle(); } node.parent().toggleClass('closed'); }; You can see here the implementation is customized to the markup I needed for MY tree. CSS handles the rest, as it should. My favorite thing about jQuery is it makes doing things the right way very easy.