用XML与ASP完成购物车
在线购物已经变得很平常了，而在使用购物车的时候，用户期望在其身上能够获得（足够的）灵活性。看看你能够如何把ASP和XML结合起来提供所用户需要的功能。
创建虚拟购物车的方法从来都不是单一的。最近，我碰到一个机会重新编写了一个经典的ASP购物车，让它成为一个拥有与原来类似的外观和感觉，但是更加灵活和更加快速的购物车。我决定利用XML，并开发一个跨浏览器的解决方案。现在让我来告诉你我自己碰到的一些问题，以及我是如何改进原有设计的。
原来的购物车
由于原来的购物车是针对特定的一组客户的，所以它更多地依赖于对用户的培训而非易用性。除了完全清空购物车，没有其他的机制用来对（所购的）内容进行更改。如果你往购物车里放入了错误的东西或者错误的数量，你不得不从头开始才能够更正这一错误。
而不为人知的是，原来的购物车再也无法变得更好。有限数量的行被显示出来，而客户会一页一页地翻阅购物车里的内容。这种方法的问题是，所有的东西都被保存在一个以ASP会话ID为基础的表格里。当客户浏览购物车内容的时候，就会进行一次查询。此外，如果会话超时，购物车的内容将会一直保留在表格里，直到有人手动删除它。
新的方法
我不想重复以前的错误，所以新的购物车将会基于XML会话而不会基于表格。这种方法有多个好处。首先，整个购物车以XML数据岛（Data Island）的形式保存在客户端上，如下面列表A所示。在进行简单浏览的时候，这就不再需要对表格进行查询了。但是用到了MozillaDSO()和xmlPage()函数。
列表A
<root>
<row>
<selected></selected>
<line>1</line>
<quantity>1</quantity>
<item>W01</item>
<description>Swept hilt rapier</description>
<weight>3.6</weight>
<unitprice>195.95</unitprice>
</row>
<row>
<selected></selected>
<line>2</line>
<quantity>2</quantity>
<item>W02</item>
<description>Hand-and-a-half sword</description>
<weight>5.8</weight>
<unitprice>250.95</unitprice>
</row>
<row>
<selected></selected>
<line>3</line>
<quantity>1</quantity>
<item>W03</item>
<description>Wood long bow</description>
<weight>2.7</weight>
<unitprice>190.00</unitprice>
</row>
<row>
<selected></selected>
<line>4</line>
<quantity>1</quantity>
<item>W04</item>
<description>Wizard staff</description>
<weight>3.1</weight>
<unitprice>89.25</unitprice>
</row>
<row>
<selected></selected>
<line>5</line>
<quantity>1</quantity>
<item>C01</item>
<description>Gauntlets</description>
<weight>0.7</weight>
<unitprice>25.00</unitprice>
</row>
<row>
<selected></selected>
<line>6</line>
<quantity>5</quantity>
<item>C02</item>
<description>Knee-high boots</description>
<weight>1.9</weight>
<unitprice>95.00</unitprice>
</row>
<row>
<selected></selected>
<line>7</line>
<quantity>9</quantity>
<item>C04</item>
<description>Cloak</description>
<weight>1.0</weight>
<unitprice>125.00</unitprice>
</row>
<row>
<selected></selected>
<line>8</line>
<quantity>22</quantity>
<item>C05</item>
<description>Orc repellent</description>
<weight>1.0</weight>
<unitprice>8.95</unitprice>
</row>
<row>
<selected></selected>
<line>9</line>
<quantity>1</quantity>
<item>W05</item>
<description>Dwarf axe</description>
<weight>8.0</weight>
<unitprice>358.95</unitprice>
</row>
<row>
<selected></selected>
<line>10</line>
<quantity>1</quantity>
<item>A01</item>
<description>Steel cap</description>
<weight>2.8</weight>
<unitprice>219.95</unitprice>
</row>
<row>
<selected></selected>
<line>11</line>
<quantity>1</quantity>
<item>A02</item>
<description>Chainmail shirt</description>
<weight>15.3</weight>
<unitprice>487.22</unitprice>
</row>
<row>
<selected></selected>
<line>12</line>
<quantity>1</quantity>
<item>A03</item>
<description>Mithril shirt</description>
<weight>0.4</weight>
<unitprice>87236.03</unitprice>
</row>
<row>
<selected></selected>
<line>13</line>
<quantity>1</quantity>
<item>W07</item>
<description>Elvish long sword</description>
<weight>1.9</weight>
<unitprice>794.99</unitprice>
</row>
<row>
<selected></selected>
<line>14</line>
<quantity>1</quantity>
<item>W08</item>
<description>Elvish short sword</description>
<weight>0.8</weight>
<unitprice>435.99</unitprice>
</row>
<row>
<selected></selected>
<line>15</line>
<quantity>3</quantity>
<item>W09</item>
<description>Short sword</description>
<weight>1.5</weight>
<unitprice>89.95</unitprice>
</row>
</root>
列表B
function update() {
/* Function: update
Creation Date: May 5, 2003
Programmer: Edmond Woychowsky
Purpose: The purpose of this function is to apply bound Data
Island changes to the full Data Island. This is
accomplished by matching line numbers in both Data
Islands. Once this has been completed the full Data
Island is sent to the server via XMLHTTP.
Update Date: Programmer: Description:
*/
var objXMLHTTP;
// XMLHTTP request object
var reWork = new RegExp('internet explorer','gi');
document.body.style.cursor = 'wait'; // Set cursor
for(var i=0;i < objPage.bound.getElementsByTagName('row').length;i++)
for(var j=0;j < objPage.full.getElementsByTagName('row').length;j++)
if(objPage.bound.getElementsByTagName('line').item(i).firstChild.nodeValue == objPage.full.getElementsByTagName('line').item(j).firstChild.nodeValue) {
for(var k=0;k < objPage.bound.getElementsByTagName('row').item(i).childNodes.length;k++)
if(objPage.bound.getElementsByTagName('row').item(i).childNodes.item(k).nodeName != '#text')
switch(objPage.bound.getElementsByTagName('row').item(i).childNodes.item(k).nodeName.toLowerCase()) {
case('quantity'):
case('selected'):
try {
objPage.full.getElementsByTagName('row').item(j).childNodes.item(k).firstChild.nodeValue = objPage.bound.getElementsByTagName('row').item(i).childNodes.item(k).firstChild.nodeValue;
}
catch(e) {
try {
objPage.full.getElementsByTagName('row').item(j).childNodes.item(k).appendChild(objPage.bound.getElementsByTagName('row').item(i).childNodes.item(k).firstChild.cloneNode(true));
}
catch(e) { }
}
break;
}
break;
}
// Send updates
if(reWork.test(navigator.appName))
objXMLHTTP = new ActiveXObject('Microsoft.XMLHTTP');
else
objXMLHTTP = new XMLHttpRequest();
objXMLHTTP.open('GET','xmlServer.asp',true);
objXMLHTTP.setRequestHeader('content-type','text/xml');
objXMLHTTP.onreadystatechange = function() {
var reWork = new RegExp('internet explorer','gi');
if(objXMLHTTP.readyState == 4) {
if(reWork.test(navigator.appName))
objPage.full.XMLDocument.loadXML(unescape(objXMLHTTP.responseText));
else
objPage.full.innerHTML = unescape(objXMLHTTP.responseText);
//Handle empty page
if(objPage.page() > objPage.pagecount())
objPage.showPrevious();
else
objPage.showPage();
// Display page info
document.getElementById('currentpage').lastChild.nodeValue = objPage.page();
document.getElementById('totalpages').lastChild.nodeValue = objPage.pagecount();
document.body.style.cursor = 'auto';
} }
// IE work around
try {
objPage.full.innerHTML = objPage.full.XMLDocument.xml;
}
catch(e) { }
if(reWork.test(navigator.appName))
objXMLHTTP.setRequestHeader('request',escape(objPage.full.XMLDocument.xml));
else
objXMLHTTP.setRequestHeader('request',escape(objPage.full.innerHTML));
objXMLHTTP.send(null);
}
在做进一步讲解之前，我会在同一个句子里使用Mozilla和XMLHTTP。有书面的证据表明Mozilla支持XMLHTTP。尽管其句法与Internet Explorer所用的句法稍有不同，但这并不是JavaScript无法处理的东西。完整的客户端解决方案见图A，而ASP见下面的列表C。
图A
列表C
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
<title>New Page 2</title>
</head>
<body>
<table cellPadding="0" width="100%" border="0" id="table1">
<tr>
<td class="subhead1">Listing C</td>
</tr>
<tr bgColor="#ff0000">
<td height="1">
<img height="1" src="http://builder.com.com/i/tr/spacer.gif" width="1"></td>
</tr>
<tr>
<td height="5">
<img height="5" src="http://builder.com.com/i/tr/spacer.gif" width="1"></td>
</tr>
<tr>
<td>
<%@ Language=JScript %>
<%
Response.Buffer = true;
var strTitle = 'Honest Ed\'s Adventure Emporium';
Session('shoppingcart') = '<root>';
Session('shoppingcart') += '<row>';
Session('shoppingcart') += '<selected></selected>';
Session('shoppingcart') += '<line>1</line>';
Session('shoppingcart') += '<quantity>1</quantity>';
Session('shoppingcart') += '<item>W01</item>';
Session('shoppingcart') += '<description>Swept hilt rapier</description>';
Session('shoppingcart') += '<weight>3.6</weight>';
Session('shoppingcart') += '<unitprice>195.95</unitprice>';
Session('shoppingcart') += '</row>';
Session('shoppingcart') += '<row>';
Session('shoppingcart') += '<selected></selected>';
Session('shoppingcart') += '<line>2</line>';
Session('shoppingcart') += '<quantity>2</quantity>';
Session('shoppingcart') += '<item>W02</item>';
Session('shoppingcart') += '<description>Hand-and-a-half sword</description>';
Session('shoppingcart') += '<weight>5.8</weight>';
Session('shoppingcart') += '<unitprice>250.95</unitprice>';
Session('shoppingcart') += '</row>';
Session('shoppingcart') += '<row>';
Session('shoppingcart') += '<selected></selected>';
Session('shoppingcart') += '<line>3</line>';
Session('shoppingcart') += '<quantity>1</quantity>';
Session('shoppingcart') += '<item>W03</item>';
Session('shoppingcart') += '<description>Wood long bow</description>';
Session('shoppingcart') += '<weight>2.7</weight>';
Session('shoppingcart') += '<unitprice>190.00</unitprice>';
Session('shoppingcart') += '</row>';
Session('shoppingcart') += '<row>';
Session('shoppingcart') += '<selected></selected>';
Session('shoppingcart') += '<line>4</line>';
Session('shoppingcart') += '<quantity>1</quantity>';
Session('shoppingcart') += '<item>W04</item>';
Session('shoppingcart') += '<description>Wizard staff</description>';
Session('shoppingcart') += '<weight>3.1</weight>';
Session('shoppingcart') += '<unitprice>89.25</unitprice>';
Session('shoppingcart') += '</row>';
Session('shoppingcart') += '<row>';
Session('shoppingcart') += '<selected></selected>';
Session('shoppingcart') += '<line>5</line>';
Session('shoppingcart') += '<quantity>1</quantity>';
Session('shoppingcart') += '<item>C01</item>';
Session('shoppingcart') += '<description>Gauntlets</description>';
Session('shoppingcart') += '<weight>0.7</weight>';
Session('shoppingcart') += '<unitprice>25.00</unitprice>';
Session('shoppingcart') += '</row>';
Session('shoppingcart') += '<row>';
Session('shoppingcart') += '<selected></selected>';
Session('shoppingcart') += '<line>6</line>';
Session('shoppingcart') += '<quantity>5</quantity>';
Session('shoppingcart') += '<item>C02</item>';
Session('shoppingcart') += '<description>Knee-high boots</description>';
Session('shoppingcart') += '<weight>1.9</weight>';
Session('shoppingcart') += '<unitprice>95.00</unitprice>';
Session('shoppingcart') += '</row>';
Session('shoppingcart') += '<row>';
Session('shoppingcart') += '<selected></selected>';
Session('shoppingcart') += '<line>7</line>';
Session('shoppingcart') += '<quantity>9</quantity>';
Session('shoppingcart') += '<item>C04</item>';
Session('shoppingcart') += '<description>Cloak</description>';
Session('shoppingcart') += '<weight>1.0</weight>';
Session('shoppingcart') += '<unitprice>125.00</unitprice>';
Session('shoppingcart') += '</row>';
Session('shoppingcart') += '<row>';
Session('shoppingcart') += '<selected></selected>';
Session('shoppingcart') += '<line>8</line>';
Session('shoppingcart') += '<quantity>22</quantity>';
Session('shoppingcart') += '<item>C05</item>';
Session('shoppingcart') += '<description>Orc repellent</description>';
Session('shoppingcart') += '<weight>1.0</weight>';
Session('shoppingcart') += '<unitprice>8.95</unitprice>';
Session('shoppingcart') += '</row>';
Session('shoppingcart') += '<row>';
Session('shoppingcart') += '<selected></selected>';
Session('shoppingcart') += '<line>9</line>';
Session('shoppingcart') += '<quantity>1</quantity>';
Session('shoppingcart') += '<item>W05</item>';
Session('shoppingcart') += '<description>Dwarf axe</description>';
Session('shoppingcart') += '<weight>8.0</weight>';
Session('shoppingcart') += '<unitprice>358.95</unitprice>';
Session('shoppingcart') += '</row>';
Session('shoppingcart') += '<row>';
Session('shoppingcart') += '<selected></selected>';
Session('shoppingcart') += '<line>10</line>';
Session('shoppingcart') += '<quantity>1</quantity>';
Session('shoppingcart') += '<item>A01</item>';
Session('shoppingcart') += '<description>Steel cap</description>';
Session('shoppingcart') += '<weight>2.8</weight>';
Session('shoppingcart') += '<unitprice>219.95</unitprice>';
Session('shoppingcart') += '</row>';
Session('shoppingcart') += '<row>';
Session('shoppingcart') += '<selected></selected>';
Session('shoppingcart') += '<line>11</line>';
Session('shoppingcart') += '<quantity>1</quantity>';
Session('shoppingcart') += '<item>A02</item>';
Session('shoppingcart') += '<description>Chainmail shirt</description>';
Session('shoppingcart') += '<weight>15.3</weight>';
Session('shoppingcart') += '<unitprice>487.22</unitprice>';
Session('shoppingcart') += '</row>';
Session('shoppingcart') += '<row>';
Session('shoppingcart') += '<selected></selected>';
Session('shoppingcart') += '<line>12</line>';
Session('shoppingcart') += '<quantity>1</quantity>';
Session('shoppingcart') += '<item>A03</item>';
Session('shoppingcart') += '<description>Mithril shirt</description>';
Session('shoppingcart') += '<weight>0.4</weight>';
Session('shoppingcart') += '<unitprice>87236.03</unitprice>';
Session('shoppingcart') += '</row>';
Session('shoppingcart') += '<row>';
Session('shoppingcart') += '<selected></selected>';
Session('shoppingcart') += '<line>13</line>';
Session('shoppingcart') += '<quantity>1</quantity>';
Session('shoppingcart') += '<item>W07</item>';
Session('shoppingcart') += '<description>Elvish long sword</description>';
Session('shoppingcart') += '<weight>1.9</weight>';
Session('shoppingcart') += '<unitprice>794.99</unitprice>';
Session('shoppingcart') += '</row>';
Session('shoppingcart') += '<row>';
Session('shoppingcart') += '<selected></selected>';
Session('shoppingcart') += '<line>14</line>';
Session('shoppingcart') += '<quantity>1</quantity>';
Session('shoppingcart') += '<item>W08</item>';
Session('shoppingcart') += '<description>Elvish short sword</description>';
Session('shoppingcart') += '<weight>0.8</weight>';
Session('shoppingcart') += '<unitprice>435.99</unitprice>';
Session('shoppingcart') += '</row>';
Session('shoppingcart') += '<row>';
Session('shoppingcart') += '<selected></selected>';
Session('shoppingcart') += '<line>15</line>';
Session('shoppingcart') += '<quantity>3</quantity>';
Session('shoppingcart') += '<item>W09</item>';
Session('shoppingcart') += '<description>Short sword</description>';
Session('shoppingcart') += '<weight>1.5</weight>';
Session('shoppingcart') += '<unitprice>89.95</unitprice>';
Session('shoppingcart') += '</row>';
Session('shoppingcart') += '</root>';
%>
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<title><%=strTitle %></title>
<style type="text/css">
TD
{
FONT-SIZE: 9pt;
FONT-FAMILY: Tahoma
}
XML
{
WIDTH: 0px;
HEIGHT: 0px;
DISPLAY: none;
}
</style>
<script language="JavaScript">
<!-- <![CDATA[
function setEvents() {
/* Function: setEvents
Creation Date: April 25, 2003
Programmer: Edmond Woychowsky
Purpose: The purpose of this function is to create an instance
of the xmlPage object, initialize the object and
perform page initialization.
Update Date: Programmer: Description:
*/
objPage = new xmlPage(); // Create instance
for(var i=0;i < document.getElementsByTagName('input').length;i++)
if(document.getElementsByTagName('input').item(i).getAttribute('type') == 'button') {
document.getElementsByTagName('input').item(i).style.height = '26px';
document.getElementsByTagName('input').item(i).style.width = '100px';
document.getElementsByTagName('input').item(i).onmouseover = new Function('this.style.color = \'#FF0000\'');
document.getElementsByTagName('input').item(i).onmouseout = new Function('this.style.color = \'#000000\'');
}
// Establish relationships
objPage.bound = document.getElementById('xmlWindow');
objPage.full = document.getElementById('xmlFull');
objPage.table = document.getElementById('boundTable');
objPage.length(10); // Set page length
objPage.showPage(); // Show first page
// Display page info
try {
document.getElementById('currentpage').removeChild(document.getElementById('currentpage').firstChild);
document.getElementById('totalpages').removeChild(document.getElementById('totalpages').firstChild);
}
catch(e) { }
document.getElementById('currentpage').appendChild(document.createTextNode(objPage.page()));
document.getElementById('totalpages').appendChild(document.createTextNode(objPage.pagecount()));
}
function update() {
/* Function: update
Creation Date: May 5, 2003
Programmer: Edmond Woychowsky
Purpose: The purpose of this function is to apply bound Data
Island changes to the full Data Island. This is
accomplished by matching line numbers in both Data
Islands. Once this has been completed the full Data
Island is sent to the server via XMLHTTP.
Update Date: Programmer: Description:
*/
var objXMLHTTP; // XMLHTTP request object
var reWork = new RegExp('internet explorer','gi');
document.body.style.cursor = 'wait'; // Set cursor
for(var i=0;i < objPage.bound.getElementsByTagName('row').length;i++)
for(var j=0;j < objPage.full.getElementsByTagName('row').length;j++)
if(objPage.bound.getElementsByTagName('line').item(i).firstChild.nodeValue == objPage.full.getElementsByTagName('line').item(j).firstChild.nodeValue) {
for(var k=0;k < objPage.bound.getElementsByTagName('row').item(i).childNodes.length;k++)
if(objPage.bound.getElementsByTagName('row').item(i).childNodes.item(k).nodeName != '#text')
switch(objPage.bound.getElementsByTagName('row').item(i).childNodes.item(k).nodeName.toLowerCase()) {
case('quantity'):
case('selected'):
try {
objPage.full.getElementsByTagName('row').item(j).childNodes.item(k).firstChild.nodeValue = objPage.bound.getElementsByTagName('row').item(i).childNodes.item(k).firstChild.nodeValue;
}
catch(e) {
try {
objPage.full.getElementsByTagName('row').item(j).childNodes.item(k).appendChild(objPage.bound.getElementsByTagName('row').item(i).childNodes.item(k).firstChild.cloneNode(true));
}
catch(e) { }
}
break;
}
break;
}
// Send updates
if(reWork.test(navigator.appName))
objXMLHTTP = new ActiveXObject('Microsoft.XMLHTTP');
else
objXMLHTTP = new XMLHttpRequest();
objXMLHTTP.open('GET','xmlServer.asp',true);
objXMLHTTP.setRequestHeader('content-type','text/xml');
objXMLHTTP.onreadystatechange = function() {
var reWork = new RegExp('internet explorer','gi');
if(objXMLHTTP.readyState == 4) {
if(reWork.test(navigator.appName))
objPage.full.XMLDocument.loadXML(unescape(objXMLHTTP.responseText));
else
objPage.full.innerHTML = unescape(objXMLHTTP.responseText);
// Handle empty page
if(objPage.page() > objPage.pagecount())
objPage.showPrevious();
else
objPage.showPage();
// Display page info
document.getElementById('currentpage').lastChild.nodeValue = objPage.page();
document.getElementById('totalpages').lastChild.nodeValue = objPage.pagecount();
document.body.style.cursor = 'auto';
}
}
// IE work around
try {
objPage.full.innerHTML = objPage.full.XMLDocument.xml;
}
catch(e) { }
if(reWork.test(navigator.appName))
objXMLHTTP.setRequestHeader('request',escape(objPage.full.XMLDocument.xml));
else
objXMLHTTP.setRequestHeader('request',escape(objPage.full.innerHTML));
objXMLHTTP.send(null);
}
function ieBusTable(objTable) {
/* Function: ieBusTable
Creation Date: April 30, 2003
Programmer: Edmond Woychowsky
Purpose: The purpose of this function is to remove the garbage
that Microsoft Internet Explorer displays when a table's
cell contains null. This porblem only applies to div
and span tags.
Update Date: Programmer: Description:
*/
var reWork = new RegExp('internet explorer','gi');
if(reWork.test(navigator.appName))
if(objTable.readyState == 'complete') {
for(var i=0;i < objTable.getElementsByTagName('div').length;i++)
if(objTable.getElementsByTagName('div').item(i).innerText.length == 0)
objTable.getElementsByTagName('div').item(i).innerText = ' ';
for(var i=0;i < objTable.getElementsByTagName('span').length;i++)
if(objTable.getElementsByTagName('span').item(i).innerText.length == 0)
objTable.getElementsByTagName('span').item(i).innerText = ' ';
}
}
function xmlPage() {
/* Function: xmlPage
Creation Date: April 25, 2003
Programmer: Edmond Woychowsky
Purpose: The purpose of this class is to define the cross-browser
(Mozill & IE) paging object.
Update Date: Programmer: Description:
*/
// Variables
var objCommonAncestor = null; // datafld common ancestor
var objInitialTable = null;
var strBound = null; // XML window data island
var strXML = null; // XML full data island
var strTable = null; // Bound HTML/XHTML table
var intAbsolutePosition = 0; // Window item index
var intPage = 1; // Logical page number
var intLength = 15; // Logical page length
var blnInitialize = false; // Initialize binds
// Properties
this.bound = null; // XML window data island
this.full = null; // XML full data island
this.table = null; // Bound HTML/XHTML table
// Methods
this.length = m_length; // Page length
this.page = m_page; // Current page number
this.pagecount = m_pageCount; // Calculate page count
this.recordcount = m_recordCount; // "ADO recordset" recordcount
this.showPage = m_showPage; // Show current page
this.showFirst = m_showFirst; // "ADO recordset" movefirst
this.showLast = m_showLast; // "ADO recordset" movelast
this.showNext = m_showNext; // "ADO recordset" movenext
this.showPrevious = m_showPrevious; // "ADO recordset" moveprevious
function m_showPage() {
/* Function: m_showPage
Creation Date: April 25, 2003
Programmer: Edmond Woychowsky
Purpose: The purpose of this function is to show the
current page's information. This is accomplished
by cloning the applicable nodes from the "full"
Data Island to the "bound" Data Island.
Update Date: Programmer: Description:
May 13, 2003 Edmond Woychowsky Modified to invoke m_recordCount()
to compute current record count.
*/
var objRoot = document.createElement('root');
var objXML = null; // XML DOM for IE
if(!blnInitialize)
initialize(this.bound,this.full,this.table);
this.full = document.getElementById(strXML);
this.bound = document.getElementById(strBound);
// Remove existing nodes
try {
document.getElementById(strTable).innerHTML = objInitialTable.innerHTML;
}
catch(e) { }
try {
for(var i=0;i < this.bound.childNodes.length;i++)
this.bound.removeChild(this.bound.childNodes.item(i));
}
catch(e) { }
// Add up to this.length nodes
for(var i=intAbsolutePosition;i < (intAbsolutePosition + intLength);i++)
if(i > (m_recordCount() - 1))
break;
else {
try { // Unique Mozilla logic
objRoot.appendChild(this.full.getElementsByTagName(objCommonAncestor).item(i).cloneNode(true));
}
catch(e) { // Unique IE logic
if(i == intAbsolutePosition) {
objXML = new ActiveXObject('MSXML.DOMDocument');
objRoot = objXML.createElement('root');
}
objRoot.appendChild(this.full.XMLDocument.getElementsByTagName(objCommonAncestor).item(i).cloneNode(true));
}
}
this.bound.appendChild(objRoot);
MozillaDSO(); // Mozilla bind logic
}
function m_showFirst() {
/* Function: m_showFirst
Creation Date: April 25, 2003
Programmer: Edmond Woychowsky
Purpose: The purpose of this function is to show the
first logical page.
Update Date: Programmer: Description:
*/
intAbsolutePosition = 0; // Set absolute position
m_showPage(); // Show page
}
function m_showLast() {
/* Function: m_showLast
Creation Date: April 25, 2003
Programmer: Edmond Woychowsky
Purpose: The purpose of this function is to show the
last logical page.
Update Date: Programmer: Description:
*/
intAbsolutePosition = (m_pageCount() - 1) * m_length();
m_showPage(); // Show page
}
function m_showNext() {
/* Function: m_showNext
Creation Date: April 25, 2003
Programmer: Edmond Woychowsky
Purpose: The purpose of this function is to show the
next logical page.
Update Date: Programmer: Description:
*/
if(m_page() < m_pageCount())
intAbsolutePosition += intLength; // Set absolute position
m_showPage(); // Show page
}
function m_showPrevious() {
/* Function: m_showPrevious
Creation Date: April 25, 2003
Programmer: Edmond Woychowsky
Purpose: The purpose of this function is to show the
previous logical page.
Update Date: Programmer: Description:
*/
if(m_page() > 1)
intAbsolutePosition -= intLength; // Set absolute position
m_showPage(); // Show page
}
function m_length() {
/* Function: m_length
Creation Date: April 25, 2003
Programmer: Edmond Woychowsky
Purpose: The purpose of this function is to set or get
the logical page length.
Update Date: Programmer: Description:
*/
if(arguments.length > 0)
intLength = parseInt(arguments[0],10);
else
return intLength;
}
function m_page() {
/* Function: m_page
Creation Date: April 25, 2003
Programmer: Edmond Woychowsky
Purpose: The purpose of this function is to compute the
current logical page number.
Update Date: Programmer: Description:
*/
return (parseInt((intAbsolutePosition / intLength),10) + 1);
}
function m_recordCount() {
/* Function: m_recordCount
Creation Date: April 25, 2003
Programmer: Edmond Woychowsky
Purpose: The purpose of this function is to compute the
return the total number of "records" in the
"full" XML Data Island.
Update Date: Programmer: Description:
May 13, 2003 Edmond Woychowsky Modified to recompute due
to possible deletes.
*/
if(!blnInitialize)
initialize(this.bound,this.full,this.table);
return document.getElementById(strXML).getElementsByTagName(objCommonAncestor).length;
}
function m_pageCount() {
/* Function: m_pageCount
Creation Date: April 25, 2003
Programmer: Edmond Woychowsky
Purpose: The purpose of this function is to compute the
return the total number of logical pages.
Update Date: Programmer: Description:
May 13, 2003 Edmond Woychowsky Modified to invoke m_recordCount()
to compute current record count.
*/
if(!blnInitialize)
initialize(this.bound,this.full,this.table);
return parseInt((m_recordCount() + (intLength - 1)) / intLength,10);
}
function initialize(objBound,objXML,objTable) {
/* Function: initialize
Creation Date: April 25, 2003
Programmer: Edmond Woychowsky
Purpose: The purpose of this function is to perform the
necessary housekeeping before paging can occur.
Update Date: Programmer: Description:
*/
var objNodeName = new collection();
var arrNodeName;
switch(true) {
case((objBound == null) && (objXML == null) && (objTable == null)):
alert('Error: bound, xml and table not set.');
break;
case((objBound == null) && (objXML == null)):
alert('Error: bound and xml not set.');
break;
case((objBound == null) && (objTable == null)):
alert('Error: bound and table not set.');
break;
case((objXML == null) && (objTable == null)):
alert('Error: xml and table not set.');
break;
case(objBound == null):
alert('Error: bound not set.');
break;
case(objXML == null):
alert('Error: xml not set.');
break;
case(objTable == null):
alert('Error: table not set.');
break;
default:
for(var i=0;i < objTable.getElementsByTagName('input').length;i++)
if(objTable.getElementsByTagName('input').item(i).getAttribute('datafld') != null)
objNodeName.item(objTable.getElementsByTagName('input').item(i).getAttribute('datafld'),null);
for(var i=0;i < objTable.getElementsByTagName('div').length;i++)
if(objTable.getElementsByTagName('div').item(i).getAttribute('datafld') != null)
objNodeName.item(objTable.getElementsByTagName('div').item(i).getAttribute('datafld'),null);
for(var i=0;i < objTable.getElementsByTagName('span').length;i++)
if(objTable.getElementsByTagName('span').item(i).getAttribute('datafld') != null)
objNodeName.item(objTable.getElementsByTagName('span').item(i).getAttribute('datafld'),null);
arrNodeName = objNodeName.keys();
objNodeName = new collection();
for(var i=0;i < arrNodeName.length;i++)
objNodeName.item(objXML.getElementsByTagName(arrNodeName[i]).item(0).parentNode.nodeName,null);
if(objNodeName.keys().length != 1)
alert('Error: unsupported XML document structure.');
else {
objCommonAncestor = objNodeName.keys().join('');
blnInitialize = true;
}
// Store node names
strBound = objBound.getAttribute('id');
strXML = objXML.getAttribute('id');
strTable = objTable.getAttribute('id');
// Store initial table
objInitialTable = objTable.cloneNode(true);
break;
}
}
}
function MozillaDSO() {
/* Function: MozillaDSO
Creation Date: April 16, 2003
Programmer: Edmond Woychowsky
Purpose: The purpose of this function is to perform binding of
XML Data Islands for Mozilla. The logic herein is bypassed
for Microsoft Internet Explorer.
Update Date: Programmer: Description:
*/
// Global variables
objXMLDI = new collection(); // XML data island collection
objBound = new collection(); // Bound XHTML object collection
// Local variables
var objDatafld; // Table datafld collection
var objRow; // Table row
var reWork = new RegExp('internet explorer','gi');
var arrKeys = new Array();
var intKey = 0; // objBound collection key
var intRows; // Row count
if(!reWork.test(navigator.appName)) {
// Locate data islands
for(var i=0;i < document.getElementsByTagName('xml').length;i++)
objXMLDI.add('#' + document.getElementsByTagName('xml').item(i).getAttribute('id'),document.getElementsByTagName('xml').item(i));
// Locate bound nodes
for(var i=0;i < document.getElementsByTagName('table').length;i++)
if(document.getElementsByTagName('table').item(i).getAttribute('datasrc') != null) {
objBound.add(intKey.toString(),new boundXML());
objBound.item(intKey.toString()).datasrc = document.getElementsByTagName('table').item(i).getAttribute('datasrc');
objBound.item(intKey.toString()).node = document.getElementsByTagName('table').item(i);
objBound.item(intKey.toString()).nodeName = document.getElementsByTagName('table').item(i).nodeName;
objDatafld = new collection(); // Reset collection;
intRows = 0; // Reset row count
// Remove all rows
if(objBound.item(intKey.toString()).node.getElementsByTagName('tr').length != 0) {
for(var j=0;j < objBound.item(intKey.toString()).node.getElementsByTagName('tr').length;j++)
objRow = objBound.item(intKey.toString()).node.lastChild.removeChild(objBound.item(intKey.toString()).node.getElementsByTagName('tr').item(j));
for(var j=0;j < objBound.item(intKey.toString()).node.getElementsByTagName('tr').length;j++)
objRow = objBound.item(intKey.toString()).node.lastChild.removeChild(objBound.item(intKey.toString()).node.getElementsByTagName('tr').item(j));
}
// Determine bound nodes
for(var j=0;j < objRow.getElementsByTagName('input').length;j++)
if(!objDatafld.exists(objRow.getElementsByTagName('input').item(j).getAttribute('datafld')))
objDatafld.item(objRow.getElementsByTagName('input').item(j).getAttribute('datafld'),null);
for(var j=0;j < objRow.getElementsByTagName('div').length;j++)
if(!objDatafld.exists(objRow.getElementsByTagName('div').item(j).getAttribute('datafld')))
objDatafld.item(objRow.getElementsByTagName('div').item(j).getAttribute('datafld'),null);
for(var j=0;j < objRow.getElementsByTagName('span').length;j++)
if(!objDatafld.exists(objRow.getElementsByTagName('span').item(j).getAttribute('datafld')))
objDatafld.item(objRow.getElementsByTagName('span').item(j).getAttribute('datafld'),null);
arrKeys = objDatafld.keys();
// Determine row count
for(var j=0;j < arrKeys.length;j++)
if(intRows < objXMLDI.item(objBound.item(intKey.toString()).datasrc).getElementsByTagName(arrKeys[0]).length)
intRows = objXMLDI.item(objBound.item(intKey.toString()).datasrc).getElementsByTagName(arrKeys[0]).length;
for(var j=0;j < intRows;j++)
objBound.item(intKey.toString()).node.lastChild.appendChild(objRow.cloneNode(true));
// Rebuild table and bind
for(var j=0;j < objBound.item(intKey.toString()).node.getElementsByTagName('tr').length;j++)
for(var k=0;k < objBound.item(intKey.toString()).node.getElementsByTagName('tr').item(j).getElementsByTagName('td').length;k++)
for(var l=0;l < objBound.item(intKey.toString()).node.getElementsByTagName('tr').item(j).getElementsByTagName('td').item(k).childNodes.length;l++)
switch(objBound.item(intKey.toString()).node.getElementsByTagName('tr').item(j).getElementsByTagName('td').item(k).childNodes.item(l).nodeName.toLowerCase()) {
case('input'):
try {
if(objBound.item(intKey.toString()).node.getElementsByTagName('tr').item(j).getElementsByTagName('td').item(k).childNodes.item(l).getAttribute('type') != 'checkbox')
objBound.item(intKey.toString()).node.getElementsByTagName('tr').item(j).getElementsByTagName('td').item(k).childNodes.item(l).value = objXMLDI.item(objBound.item(intKey.toString()).datasrc).getElementsByTagName(objBound.item(intKey.toString()).node.getElementsByTagName('tr').item(j).getElementsByTagName('td').item(k).childNodes.item(l).getAttribute('datafld')).item(j).firstChild.nodeValue;
else
objBound.item(intKey.toString()).node.getElementsByTagName('tr').item(j).getElementsByTagName('td').item(k).childNodes.item(l).checked = eval(objXMLDI.item(objBound.item(intKey.toString()).datasrc).getElementsByTagName(objBound.item(intKey.toString()).node.getElementsByTagName('tr').item(j).getElementsByTagName('td').item(k).childNodes.item(l).getAttribute('datafld')).item(j).firstChild.nodeValue);
}
catch(e) { }
if(objBound.item(intKey.toString()).node.getElementsByTagName('tr').item(j).getElementsByTagName('td').item(k).childNodes.item(l).getAttribute('type') != 'checkbox')
objBound.item(intKey.toString()).node.getElementsByTagName('tr').item(j).getElementsByTagName('td').item(k).childNodes.item(l).onchange = new Function('try { objXMLDI.item(\'' + objBound.item(intKey.toString()).datasrc + '\').getElementsByTagName(\'' + objBound.item(intKey.toString()).node.getElementsByTagName('tr').item(j).getElementsByTagName('td').item(k).childNodes.item(l).getAttribute('datafld') + '\').item(' + j.toString() + ').firstChild.nodeValue = this.value } catch(e) { objXMLDI.item(\'' + objBound.item(intKey.toString()).datasrc + '\').getElementsByTagName(\'' + objBound.item(intKey.toString()).node.getElementsByTagName('tr').item(j).getElementsByTagName('td').item(k).childNodes.item(l).getAttribute('datafld') + '\').item(' + j.toString() + ').appendChild(document.createTextNode(this.value)) };MozillaDSO;');
else
objBound.item(intKey.toString()).node.getElementsByTagName('tr').item(j).getElementsByTagName('td').item(k).childNodes.item(l).onchange = new Function('try { objXMLDI.item(\'' + objBound.item(intKey.toString()).datasrc + '\').getElementsByTagName(\'' + objBound.item(intKey.toString()).node.getElementsByTagName('tr').item(j).getElementsByTagName('td').item(k).childNodes.item(l).getAttribute('datafld') + '\').item(' + j.toString() + ').firstChild.nodeValue = this.checked } catch(e) { objXMLDI.item(\'' + objBound.item(intKey.toString()).datasrc + '\').getElementsByTagName(\'' + objBound.item(intKey.toString()).node.getElementsByTagName('tr').item(j).getElementsByTagName('td').item(k).childNodes.item(l).getAttribute('datafld') + '\').item(' + j.toString() + ').appendChild(document.createTextNode(this.checked)) };MozillaDSO;');
break;
case('div'):
case('span'):
try { // Text node exists
objBound.item(intKey.toString()).node.getElementsByTagName('tr').item(j).getElementsByTagName('td').item(k).childNodes.item(l).firstChild.nodeValue = objXMLDI.item(objBound.item(intKey.toString()).datasrc).getElementsByTagName(objBound.item(intKey.toString()).node.getElementsByTagName('tr').item(j).getElementsByTagName('td').item(k).childNodes.item(l).getAttribute('datafld')).item(j).firstChild.nodeValue;
}
catch(e) { // Create text node
try {
objBound.item(intKey.toString()).node.getElementsByTagName('tr').item(j).getElementsByTagName('td').item(k).childNodes.item(l).appendChild(document.createTextNode(objXMLDI.item(objBound.item(intKey.toString()).datasrc).getElementsByTagName(objBound.item(intKey.toString()).node.getElementsByTagName('tr').item(j).getElementsByTagName('td').item(k).childNodes.item(l).getAttribute('datafld')).item(j).firstChild.nodeValue));
}
catch(e) { }
}
break;
}
++intKey;
}
// Non-tabular datasrc/datafld
for(var i=0;i < document.getElementsByTagName('input').length;i++)
if(document.getElementsByTagName('input').item(i).getAttribute('datafld') != null) {
objBound.add(intKey.toString(),new boundXML());
if(document.getElementsByTagName('input').item(i).getAttribute('datasrc') != null)
objBound.item(intKey.toString()).datasrc = document.getElementsByTagName('input').item(i).getAttribute('datasrc');
objBound.item(intKey.toString()).datafld = document.getElementsByTagName('input').item(i).getAttribute('datafld');
objBound.item(intKey.toString()).node = document.getElementsByTagName('input').item(i);
objBound.item(intKey.toString()).nodeName = document.getElementsByTagName('input').item(i).nodeName;
++intKey;
}
for(var i=0;i < document.getElementsByTagName('div').length;i++)
if(document.getElementsByTagName('div').item(i).getAttribute('datafld') != null) {
objBound.add(intKey.toString(),new boundXML());
if(document.getElementsByTagName('div').item(i).getAttribute('datasrc') != null)
objBound.item(intKey.toString()).datasrc = document.getElementsByTagName('div').item(i).getAttribute('datasrc');
objBound.item(intKey.toString()).datafld = document.getElementsByTagName('div').item(i).getAttribute('datafld');
objBound.item(intKey.toString()).node = document.getElementsByTagName('div').item(i);
objBound.item(intKey.toString()).nodeName = document.getElementsByTagName('div').item(i).nodeName;
++intKey;
}
for(var i=0;i < document.getElementsByTagName('span').length;i++)
if(document.getElementsByTagName('span').item(i).getAttribute('datafld') != null) {
objBound.add(intKey.toString(),new boundXML());
if(document.getElementsByTagName('span').item(i).getAttribute('datasrc') != null)
objBound.item(intKey.toString()).datasrc = document.getElementsByTagName('span').item(i).getAttribute('datasrc');
objBound.item(intKey.toString()).datafld = document.getElementsByTagName('span').item(i).getAttribute('datafld');
objBound.item(intKey.toString()).node = document.getElementsByTagName('span').item(i);
objBound.item(intKey.toString()).nodeName = document.getElementsByTagName('span').item(i).nodeName;
++intKey;
}
arrKeys = objBound.keys();
// Handle non-tabular binds
for(var i=0;i < arrKeys.length;i++)
switch(objBound.item(arrKeys[i]).nodeName.toLowerCase()) {
case('table'):
objBound.item(arrKeys[i]).rows = new Array();
break;
case('input'):
try {
if(typeof(objBound.item(arrKeys[i]).datasrc) == 'string') {
try {
if(objBound.item(arrKeys[i]).node.getAttribute('type') != 'checkbox')
objBound.item(arrKeys[i]).node.value = objXMLDI.item(objBound.item(arrKeys[i]).datasrc).getElementsByTagName(objBound.item(arrKeys[i]).datafld).item(0).firstChild.nodeValue;
else
objBound.item(arrKeys[i]).node.checked = eval(objXMLDI.item(objBound.item(arrKeys[i]).datasrc).getElementsByTagName(objBound.item(arrKeys[i]).datafld).item(0).firstChild.nodeValue);
}
catch(e) { }
if(objBound.item(arrKeys[i]).node.getAttribute('type') != 'checkbox')
objBound.item(arrKeys[i]).node.onchange = new Function('try { objXMLDI.item(this.getAttribute(\'datasrc\')).getElementsByTagName(this.getAttribute(\'datafld\')).item(0).firstChild.nodeValue = this.value } catch(e) { objXMLDI.item(this.getAttribute(\'datasrc\')).getElementsByTagName(this.getAttribute(\'datafld\')).item(0).appendChild(document.createTextNode(this.value)) };MozillaDSO()');
else
objBound.item(arrKeys[i]).node.onclick = new Function('try { objXMLDI.item(this.getAttribute(\'datasrc\')).getElementsByTagName(this.getAttribute(\'datafld\')).item(0).firstChild.nodeValue = this.checked } catch(e) { objXMLDI.item(this.getAttribute(\'datasrc\')).getElementsByTagName(this.getAttribute(\'datafld\')).item(0).appendChild(document.createTextNode(this.checked)) };MozillaDSO()');
}
}
catch(e) { }
break;
case('div'):
case('span'):
if(typeof(objBound.item(arrKeys[i]).datasrc) == 'string') {
try { // Text node exists
objBound.item(arrKeys[i]).node.firstChild.nodeValue = objXMLDI.item(objBound.item(arrKeys[i]).datasrc).getElementsByTagName(objBound.item(arrKeys[i]).datafld).item(0).firstChild.nodeValue;
}
catch(e) { // Create text node
try {
objBound.item(arrKeys[i]).node.appendChild(document.createTextNode(objXMLDI.item(objBound.item(arrKeys[i]).datasrc).getElementsByTagName(objBound.item(arrKeys[i]).datafld).item(0).firstChild.nodeValue));
}
catch(e) { }
}
}
break;
default:
alert('Error: Unsupported HTML Element - ' + objBound.item(arrKeys[i]).nodeName.toLowerCase());
break;
}
}
function boundXML() {
var datasrc = null; // Data source (string)
var datafld = null; // Data field (string)
var node = null; // XHTML node (object)
var nodeName = null; // Node name (string)
}
}
function collection() {
/* Function: collection
Creation Date: August 16, 2002
Programmer: Edmond Woychowsky
Purpose: The purpose of this class is to define the collection
object associative array.
Update Date: Programmer: Description:
*/
// Properties
this.objcollection = new Object; // Associative array
this.count = 0; // Total numbers of items
// Methods
this.add = colAdd; // Add method
this.exists = colExists; // Exists method
this.item = colItem; // Item method
this.removeAll = colRemoveAll; // Remove all method
this.remove = colRemove; // Remove method
this.keys = colKeys; // Keys method
function colAdd(strKey,strItem) {
/* Function: colAdd
Creation Date: August 16, 2002
Programmer: Edmond Woychowsky
Purpose: The purpose of this function is to add an item to
the collection object.
Update Date: Programmer: Description:
*/
if(typeof(this.objcollection[strKey]) == 'undefined')
++this.count;
this.objcollection[strKey] = strItem;
}
function colExists(strKey) {
/* Function: colExists
Creation Date: August 16, 2002
Programmer: Edmond Woychowsky
Purpose: The purpose of this function is to return a boolean
indicating where or not a key exists in the
collection object.
Update Date: Programmer: Description:
*/
if(typeof(this.objcollection[strKey]) == 'undefined')
return false;
else
return true;
}
function colItem(strKey,strItem) {
/* Function: colItem
Creation Date: August 16, 2002
Programmer: Edmond Woychowsky
Purpose: The purpose of this function is to either set or get
an item to or from the collection object.
Update Date: Programmer: Description:
*/
if(typeof(strItem) == 'undefined')
return this.objcollection[strKey];
else {
if(typeof(this.objcollection[strKey]) == 'undefined')
++this.count;
this.objcollection[strKey] = strItem;
}
}
function colRemoveAll() {
/* Function: colRemoveAll
Creation Date: August 16, 2002
Programmer: Edmond Woychowsky
Purpose: The purpose of this function is to remove all keys
and items from the collection object and set the
item count to zero.
Update Date: Programmer: Description:
*/
this.objcollection = new Object;
this.count = 0;
}
function colRemove(strKey) {
/* Function: colRemove
Creation Date: August 16, 2002
Programmer: Edmond Woychowsky
Purpose: The purpose of this function is to remove a single
item and it's associated key from the collection
object and decrement the count by one.
Update Date: Programmer: Description:
*/
if(typeof(strItem) != 'undefined') {
this.objcollection[strKey] == 'undefined';
--this.count;
}
}
function colKeys() {
/* Function: colKeys
Creation Date: August 16, 2002
Programmer: Edmond Woychowsky
Purpose: The purpose of this function is to return an array
consisting of the collection object's keys.
Update Date: Programmer: Description:
*/
var arrWork = new Array();
var strKey;
for(strKey in this.objcollection)
if(this.objcollection[strKey] != 'undefined')
arrWork.push(strKey);
return arrWork;
}
}
// ]]> -->
</script>
</head>
<body onload="setEvents()">
<table width="100%" border="0">
<tr>
<td width="100%" align="center" bgcolor="black" >
<font color="white" size="8pt"><%=strTitle %></font>
</td>
</tr>
</table>
<table width="100%" height="450" border="0">
<tr>
<td align="left" valign="top">
<table id="boundTable" datasrc="#xmlWindow" width="100%" border="1" onreadystatechange="ieBusTable(this)">
<thead>
<td bgcolor="#FFFFEE" width="5%"><b>Delete</b></td>
<td bgcolor="#FFFFEE" width="5%"><b>Line</b></td>
<td bgcolor="#FFFFEE" width="20%"><b>Item number</b></td>
<td bgcolor="#FFFFEE" width="30%"><b>Description</b></td>
<td bgcolor="#FFFFEE" width="25%"><b>Weight</b></td>
<td bgcolor="#FFFFEE" width="7%"><b>Quantity</b></td>
<td bgcolor="#FFFFEE" width="8%"><b>Unit Price</b></td>
</thead>
<tr>
<td align="center" valign="top">
<input type="hidden" id="line" name="line" datafld="line" />
<input type="checkbox" id="selected" name="selected" datafld="selected" />
</td>
<td align="right" valign="top">
<div datafld="line"></div>
</td>
<td valign="top">
<div datafld="item"></div>
</td>
<td valign="top">
<div datafld="description"></div>
</td>
<td valign="top">
<div datafld="weight"></div>
</td>
<td align="center" valign="top">
<input type="text" id="quantity" name="quantity" datafld="quantity" style="text-align: right" size="5" maxlength="3" />
</td>
<td align="right" valign="top">
<div datafld="unitprice"></div>
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td align="bottom">
<table width="100%" border="0">
<tr>
<td align="right">
Page <span id="currentpage"></span> of <span id="totalpages"></span>
</td>
</tr>
</table>
</td>
</tr>
</table>
<p />
<table width="100%" border="0">
<tr>
<td width="12%">
<input type="button" name="First" id="First" value="First" onclick="document.body.style.cursor = 'wait';objPage.showFirst();document.getElementById('currentpage').lastChild.nodeValue = objPage.page();document.body.style.cursor = 'auto'" />
</td>
<td width="12%">
<input type="button" name="Next" id="Next" value="Next" onclick="document.body.style.cursor = 'wait';objPage.showNext();document.getElementById('currentpage').lastChild.nodeValue = objPage.page();document.body.style.cursor = 'auto'" />
</td>
<td width="12%">
<input type="button" name="Previous" id="Previous" value="Previous" onclick="document.body.style.cursor = 'wait';objPage.showPrevious();document.getElementById('currentpage').lastChild.nodeValue = objPage.page();document.body.style.cursor = 'auto'" />
</td>
<td width="12%">
<input type="button" name="Last" id="Last" value="Last" onclick="document.body.style.cursor = 'wait';objPage.showLast();document.getElementById('currentpage').lastChild.nodeValue = objPage.page();document.body.style.cursor = 'auto'" />
</td>
<td width="12%"> </td>
<td width="12%">
<input type="button" name="Update" id="Update" value="Update" onclick="document.body.style.cursor = 'wait';update();document.body.style.cursor = 'auto'" />
</td>
<td> </td>
</tr>
</table>
<xml id="xmlWindow" async="false">
</xml>
<xml id="xmlFull" async="false"><%=Session("shoppingcart") %></xml>
</body>
</html>
</td>
</tr>
</table>
</body>
</html>
服务器端
一旦客户端的代码编写完成，就到了把注意力集中到购物车的服务器端上了。创建购物车的机制因电子商务系统的差异而有所不同，但是XLM数据岛的基本布局就像下面列表D里面的一样。
<%@ Language=JScript %>
<%
/* ASP: xmlServer
Creation Date: May 12, 2003
Programmer: Edmond Woychowsky
Purpose: The purpose of this script is to handle client-side changes
to the contents of an XML "shopping cart".
Update Date: Programmer: Description:
*/
var objXML = new ActiveXObject('MSXML2.FreeThreadedDOMDocument.4.0');
objXML.loadXML(unescape(Request.ServerVariables.Item('HTTP_request')));
if(objXML.parseError == 0) { // Delete rows
for(var i=0;i < objXML.getElementsByTagName('row').length;i++)
if(eval(objXML.getElementsByTagName('selected').item(i).text)) {
objXML.getElementsByTagName('root').item(0).removeChild(objXML.getElementsByTagName('row').item(i));
--i;
}
// Resequence lines
for(var i=0;i < objXML.getElementsByTagName('line').length;i++)
objXML.getElementsByTagName('line').item(i).text = (i + 1).toString();
Session('shoppingcart') = objXML.xml; // Update session variable
}
Response.Write(Session('shoppingcart')); // Respond to client
objXML = null;
// Clean up
%>
由于这只是一个演示版的应用程序，所以客户端页面代码之后部分（见列表C）并没有显示出购物车最初是如何创建的，也没有显示任何数据库逻辑。它把重点放在了购物车的操控上（见列表D）。当第一件物品被选中的时候，利用XML文档对象模型（DOM），或者通过使用ADO的保存方法和XSLT就可以完成创建购物车了。以后的物品简单地通过使用DOM或者XSLT就可以加在后面了。
检验过程就是数据库逻辑所在的地方。我使用DOM来浏览XML购物车，使用一个Oracle存储过程来更新或者添加数据行，这真的对那些使用SQL服务器或者MySQL的购物车没有什么帮助。
第二次会更好
使用XML数据岛比较容易让HTML具有清爽的外观。这里没有一行接一行的服务器端代码，也没有嵌入在循环里的单行HTML，这里有的是一行HTML。当有人在你刚刚完成购物车应用程序就建议添加一个数据列的时候，这个方法可以帮助你避免一些开发人员需要面对的维护恶梦。
……