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Both the recursiveTreeNodesAdaptor and treeNodesAdaptor components allow you to define a data model declaratively and bind treeNode components to tree model nodes. treeNodesAdaptor has a nodes attribute that s used to define a collection of elements to iterate through. Collections are allowed to include any lists, arrays, maps, and XML NodeList and NamedNodeMap nodes as a single object. The current collection element is accessible via a request-scoped variable called var. recursiveTreeNodesAdaptor is an extension of a treeNodesAdaptor component that allows you to define two different value expressions: the first, assigned by the roots attribute, is used at the top of the recursion, and the second, nodes, is used on the second level and deeper. Let s create a simple file system tree using the recursive adaptor. First you create the recursiveAdaptorBean that will contain an Array of root nodes: package demo.adaptors; public class RecursiveAdaptorBean { private static String SRC_PATH = "/WEB-INF/classes"; private FileSystemNode[] srcRoots;

new Draggable('some_element');

Instead of having the listener class create the Podcast object, we ll create one via the page specification (see Listing 6-24). This creates a new instance of Podcast and binds it to an attribute called podcast. (Note: you could also use the ognl: prefix to create an instance of the Podcast class as well.)

Let s create a sandbox for playing around with draggables. Create draggable.html and add this markup:

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public synchronized FileSystemNode[] getSourceRoots() { if (srcRoots == null) { srcRoots = new FileSystemNode(SRC_PATH).getNodes(); } return srcRoots; } } Here is the FileSystemNode implementation: package demo.adaptors; import java.util.Set; import javax.faces.context.ExternalContext; import javax.faces.context.FacesContext; public class FileSystemNode { private String path; private static FileSystemNode[] CHILDREN_ABSENT = new FileSystemNode[0]; private FileSystemNode[] children; private String shortPath; public FileSystemNode(String path) { this.path = path; int idx = path.lastIndexOf('/'); if (idx != -1) { shortPath = path.substring(idx + 1); } else { shortPath = path; } } public synchronized FileSystemNode[] getNodes() { if (children == null) { FacesContext facesContext = FacesContext.getCurrentInstance(); ExternalContext externalContext = facesContext.getExternalContext(); Set resourcePaths = externalContext.getResourcePaths(this.path); if (resourcePaths != null) { Object[] nodes = (Object[]) resourcePaths.toArray(); children = new FileSystemNode[nodes.length]; for (int i = 0; i < nodes.length; i++) { String nodePath = nodes[i].toString(); if (nodePath.endsWith("/")) { nodePath = nodePath.substring(0, nodePath.length() - 1); } children[i] = new FileSystemNode(nodePath); }

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html> <head> <title>Draggable demo</title>

< xml version="1.0" encoding="UTF-8" > <!DOCTYPE page-specification PUBLIC "-//Apache Software Foundation//Tapestry Specification 4.0//EN" "http://jakarta.apache.org/tapestry/dtd/Tapestry_4_0.dtd"> <page-specification> <property name="podcast" persist="session" initial-value="new com.proajax.chapt6.Podcast()" /> </page-specification> At this point, we need to create the listener class mentioned before (see Listing 6-25). This class is really quite basic in this example. In the real world, your addPodcast method would actually do something (like persist the object in the database).

y now, you re almost certainly familiar with Ajax as a buzzword. Technically, it s an acronym Asynchronous JavaScript and XML and refers specifically to JavaScript s XmlHttpRequest object, which lets a browser initiate an HTTP request outside the confines of the traditional page request. Yawn. The technology isn t the exciting part. Ajax is huge because it pushes the boundaries of what you can do with a web UI: it lets you reload part of a page without reloading the entire page. For a page-based medium like the Web, this is a seismic leap forward.

} else { children = CHILDREN_ABSENT; } } return children; } public String toString() { return shortPath; } } Now you need only the page definition: <rich:panel style="width:400px"> <f:facet name="header"> <h:outputText value="Using Tree Adaptors" /> </f:facet> <rich:tree style="width:300px" switchType="ajax"> <rich:recursiveTreeNodesAdaptor roots="#{recursiveAdaptorBean.sourceRoots}" var="item" nodes="#{item.nodes}" /> </rich:tree> </rich:panel> Now you can find your classes that you described using the tree on the page:

requests. It lets a developer ask the browser to fetch a URL in the background, but without any of the typical baggage of a page request the hourglass, the new page, and the re-rendering. Think of it as an HTTP library for JavaScript, not unlike Ruby s Net::HTTP class or PHP s libcurl bindings. But because it lives on the client side, it can act as a scout, marshaling requests between client and server in a much less disruptive way than the typical page request. The difference is crucial the user has to wait around for a page request, but XHR doesn t. Like the acronym says, Ajax allows for asynchronous communication the JavaScript engine can create a request, send it off, and then do other things until the response comes back. It s far better than making your users do other things until the response comes back.

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