用XML與ASP完成購(gòu)物車
發(fā)表時(shí)間：2024-01-06 來源：明輝站整理相關(guān)軟件相關(guān)文章人氣：
[摘要]在線購(gòu)物已經(jīng)變得很平常了，而在使用購(gòu)物車的時(shí)候，用戶期望在其身上能夠獲得（足夠的）靈活性。看看你能夠如何把ASP和XML結(jié)合起來提供所用戶需要的功能。 創(chuàng)建虛擬購(gòu)物車的方法從來都不是單一的。最近，我碰到一個(gè)機(jī)會(huì)重新編寫了一個(gè)經(jīng)典的ASP購(gòu)物車，讓它成為一個(gè)擁有與原來類似的外觀和感覺，但是更加...
在線購(gòu)物已經(jīng)變得很平常了，而在使用購(gòu)物車的時(shí)候，用戶期望在其身上能夠獲得（足夠的）靈活性�？纯茨隳軌蛉绾伟袮SP和XML結(jié)合起來提供所用戶需要的功能。
創(chuàng)建虛擬購(gòu)物車的方法從來都不是單一的。最近，我碰到一個(gè)機(jī)會(huì)重新編寫了一個(gè)經(jīng)典的ASP購(gòu)物車，讓它成為一個(gè)擁有與原來類似的外觀和感覺，但是更加靈活和更加快速的購(gòu)物車。我決定利用XML，并開發(fā)一個(gè)跨瀏覽器的解決方案�，F(xiàn)在讓我來告訴你我自己碰到的一些問題，以及我是如何改進(jìn)原有設(shè)計(jì)的。
原來的購(gòu)物車
由于原來的購(gòu)物車是針對(duì)特定的一組客戶的，所以它更多地依賴于對(duì)用戶的培訓(xùn)而非易用性。除了完全清空購(gòu)物車，沒有其他的機(jī)制用來對(duì)（所購(gòu)的）內(nèi)容進(jìn)行更改。如果你往購(gòu)物車?yán)锓湃肓隋e(cuò)誤的東西或者錯(cuò)誤的數(shù)量，你不得不從頭開始才能夠更正這一錯(cuò)誤。
而不為人知的是，原來的購(gòu)物車再也無法變得更好。有限數(shù)量的行被顯示出來，而客戶會(huì)一頁一頁地翻閱購(gòu)物車?yán)锏膬?nèi)容。這種方法的問題是，所有的東西都被保存在一個(gè)以ASP會(huì)話ID為基礎(chǔ)的表格里。當(dāng)客戶瀏覽購(gòu)物車內(nèi)容的時(shí)候，就會(huì)進(jìn)行一次查詢。此外，如果會(huì)話超時(shí)，購(gòu)物車的內(nèi)容將會(huì)一直保留在表格里，直到有人手動(dòng)刪除它。
新的方法
我不想重復(fù)以前的錯(cuò)誤，所以新的購(gòu)物車將會(huì)基于XML會(huì)話而不會(huì)基于表格。這種方法有多個(gè)好處。首先，整個(gè)購(gòu)物車以XML數(shù)據(jù)島（Data Island）的形式保存在客戶端上，如下面列表A所示。在進(jìn)行簡(jiǎn)單瀏覽的時(shí)候，這就不再需要對(duì)表格進(jìn)行查詢了。但是用到了MozillaDSO()和xmlPage()函數(shù)。
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);
}
在做進(jìn)一步講解之前，我會(huì)在同一個(gè)句子里使用Mozilla和XMLHTTP。有書面的證據(jù)表明Mozilla支持XMLHTTP。盡管其句法與Internet Explorer所用的句法稍有不同，但這并不是JavaScript無法處理的東西。完整的客戶端解決方案見圖A，而ASP見下面的列表C。
圖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>
服務(wù)器端
一旦客戶端的代碼編寫完成，就到了把注意力集中到購(gòu)物車的服務(wù)器端上了。創(chuàng)建購(gòu)物車的機(jī)制因電子商務(wù)系統(tǒng)的差異而有所不同，但是XLM數(shù)據(jù)島的基本布局就像下面列表D里面的一樣。
<%@ 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
%>
由于這只是一個(gè)演示版的應(yīng)用程序，所以客戶端頁面代碼之后部分（見列表C）并沒有顯示出購(gòu)物車最初是如何創(chuàng)建的，也沒有顯示任何數(shù)據(jù)庫(kù)邏輯。它把重點(diǎn)放在了購(gòu)物車的操控上（見列表D）。當(dāng)?shù)谝患锲繁贿x中的時(shí)候，利用XML文檔對(duì)象模型（DOM），或者通過使用ADO的保存方法和XSLT就可以完成創(chuàng)建購(gòu)物車了。以后的物品簡(jiǎn)單地通過使用DOM或者XSLT就可以加在后面了。
檢驗(yàn)過程就是數(shù)據(jù)庫(kù)邏輯所在的地方。我使用DOM來瀏覽XML購(gòu)物車，使用一個(gè)Oracle存儲(chǔ)過程來更新或者添加數(shù)據(jù)行，這真的對(duì)那些使用SQL服務(wù)器或者M(jìn)ySQL的購(gòu)物車沒有什么幫助。
第二次會(huì)更好
使用XML數(shù)據(jù)島比較容易讓HTML具有清爽的外觀。這里沒有一行接一行的服務(wù)器端代碼，也沒有嵌入在循環(huán)里的單行HTML，這里有的是一行HTML。當(dāng)有人在你剛剛完成購(gòu)物車應(yīng)用程序就建議添加一個(gè)數(shù)據(jù)列的時(shí)候，這個(gè)方法可以幫助你避免一些開發(fā)人員需要面對(duì)的維護(hù)惡夢(mèng)。
