Display Tree __web in Web

You need to display a tree in the web, which is a treemodel from server-side program queries.
The basic idea is: use JavaScript to show the tree, JSP to generate the page containing the JS code.

There are two key points,
One: How does JavaScript show trees?
Two: How does TreeModel give JavaScript a show? (This is related to the implementation interface of one).

One: JavaScript display:
First, the good news is that JavaScript has a lot of free libraries and it's easy to find one:
We use Tigra tree, the download address is:
http://www.softcomplex.com/products/tigra_tree_menu/
Very simple to use:

1: Use the downloaded code tree.js (if you do not do special processing, you do not have to change)
<script language= "JavaScript" src= "Js/tree.js" ></script>

2: First use the definition library of the default tree icon.
<script language= "JavaScript" src= "Js/tree_tpl.js" ></script>
Note: Target in the first row is the destination page that defines the click Navigation.
Other icons can be changed as needed. Icon file in the download demo's icons directory.

3: OK, here's the key, defining the tree's data variables:
Variable names must be TREE_ITEMS, structure, very simple, look at the example:
var tree_items = [
[' Home ', ' http://www.softcomplex.com/index.html ',
[' Services ', ' http://www.softcomplex.com/services.html '],
[' Download ', ' http://www.softcomplex.com/download.html '],
[' Order ', ' http://www.softcomplex.com/order.html '],
[' Support ', ' http://www.softcomplex.com/support.html '],
],
[' Level 0 Item 1 ', NULL,
[' Level 1 Item 0 ', ' links.html '],
[' Level 1 Item 1 ', 0,
[' Level 2 Item 0 '],
[' Level 2 Item 1 ', 0],
],
[' Level 1 Item 2 '],
[' Level 1 Item 3 '],
]
];
I think this is no need to explain, to see the effect of the sample is clear.
In fact, the tree_items here needs to be dynamically generated, I define variable treeitems in the JSP to generate, here directly assigned value is good. < script language = "JavaScript" >
var tree_items = <%= Treeitems%>;
</script >
Second: How to export data from TreeModel Tree_items
This generally has two kinds of practice, one is direct recursive generation, the other is the gentleman into XML, and then use XSLT to convert to the Tree_items string in the required format.
In fact, the use of recursive generation is very simple, so I use the first:

public class Treeitemutil
{
static private StringBuffer sbtreeitems = null;
Static private String subjectname= "";
static public String Createtreeitems (TreeNode node)
... {
Sbtreeitems = new StringBuffer ();
Totreeitem (node);
return sbtreeitems.tostring ();
}

static private void Totreeitem (TreeNode node)
... {
if (Node.isleaf ())
... {
String info = "";
Object obj = ((defaultmutabletreenode) node). Getuserobject ();
Take display value caption and command execution related parameters cmd
......
Sbtreeitems.append ("['" + caption + "', '" + cmd + "'],");
}
Else
... {
Object obj = ((defaultmutabletreenode) node). Getuserobject ();
Take a display value, generally there is no command, because the Non-leaf node, so give 0 value.
......
Sbtreeitems.append ("['" + caption + "', 0,");
for (int i = 0; i < Node.getchildcount (); i++)
... {
Totreeitem (Node.getchildat (i));
}
Sbtreeitems.append ("],");
}
}
}
Call Createtreeitems, the root node of the TreeModel is passed in, you can get the string you need.
Well, that's probably it.