XML Tree
/*
Mastering JavaScript, Premium Edition
by James Jaworski
ISBN:078212819X
Publisher Sybex CopyRight 2001
*/
<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Tree Component</title>
<style type="text/css" >
BLOCKQUOTE {
margin-top: -5;
margin-bottom: -5;
}
TABLE {
margin-top: 0;
margin-bottom: 0;
}
A:link, A:visited {
color: black;
text-decoration: none;
}
</style>
<script language="JavaScript">
var nodes = new Array("XML, XSLT, and JavaScript Tree Component",
"Features",
"The nodes and structure of the tree are specified in XML.",
"An XSLT stylesheet enables the tree to be rendered in HTML.",
"The display and operation of the tree is handled in JavaScript.",
"Design", "The tree component consists of the following files:",
"tree.xml", "Defines the tree's text and structure.",
"tree.dtd", "Provides a DTD for tree.xml.",
"tree.xsl", "Transforms the tree into HTML and JavaScript.",
"tree.js", "Defines the Tree object.",
"tree.css", "Styles the transformed tree."
)
var branches = new Array(new Array(0,1),new Array(1,2),
new Array(1,3),new Array(1,4),new Array(0,5),new Array(5,6),
new Array(6,7),new Array(7,8),new Array(6,9),new Array(9,10),
new Array(6,11),new Array(11,12),new Array(6,13),new Array(13,14),
new Array(6,15),new Array(15,16),new Array(-1,-1))
</script>
<script language="JavaScript" >
var tree = createTree()
function createTree() {
branchID = 0
var subtrees = new Array()
for(var i=0; i<nodes.length; ++i)
subtrees[i] = new Tree(nodes[i])
for(var i=0; i<branches.length - 1; ++i)
subtrees[branches[i][0]].addBranch(subtrees[branches[i][1]])
return subtrees[0]
}
function Tree(root) {
this.text = root
this.id = branchID
++branchID
this.expanded = true
this.branches = new Array()
this.addBranch = Tree_addBranch
this.changeState = Tree_changeState
this.handleClick = Tree_handleClick
this.processClick = Tree_processClick
this.display = Tree_display
this.getTreeString = Tree_getTreeString
}
function Tree_addBranch(tree) {
this.branches[this.branches.length] = tree
}
function Tree_changeState() {
this.expanded = !this.expanded
}
function Tree_handleClick(branch) {
this.processClick(branch)
var d = document.getElementById("tree")
if(d != null) d.innerHTML = this.getTreeString()
}
function Tree_processClick(branch) {
if(this.id == branch) this.changeState()
else {
for(var i=0; i<this.branches.length; ++i)
this.branches[i].processClick(branch)
}
}
function Tree_getTreeString() {
var s = "<blockquote>"
s += '<table border="0">'
s += "<tr>"
s += "<td>"
if(this.branches.length > 0)
s += '<a href="javascript:tree.handleClick('+this.id+')">+</a>'
else s += "-"
s += "</td>"
s += "<td>"
s += this.text
s += "</td>"
s += "</tr>"
s += "</table>"
if((this.branches.length > 0) && (this.expanded == true)) {
for(var i=0; i<this.branches.length; ++i)
s += this.branches[i].getTreeString()
}
s += "</blockquote>"
return s
}
function Tree_display() {
document.writeln(this.getTreeString())
}
</script>
</head>
<body>
<hr>
<div id="tree"><script language="JavaScript">
tree.display()
</script>
</div>
<hr>
</body>
</html>
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