Question

Filling a select box

Asked by: nykita

I am new to xml,xsl and javascript.
I need help in solving my problem in 2 different ways, one using xml islands in a html file and the other using xml and xsl.
Firstly what I am doing:
As an example I have customer details in xml they are Name, Age, Street, Town, State, Country. I am displaying these details in a html table and I am allowing the user edit the details. If the country is USA then the Select box appears in the State cell of the table with the state selected as got from the Customer xml. I also have a State xml which holds all the states in USA, the Select box is filled from this xml. I have to allow the user change the state if necessary.

My question is how do I fill the table from the customer xml and the State xml. If the country is not the USA then no Select box appears for that customer. How would I do it using xml islands in html on one hand and on the other using xml and xsl.

I do not know where to start. Any help would be greately appreciated.

NL

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Asked On: 2001-12-30 at 17:41:37ID20250127
Tags: xsl
Topic: Extensible Markup Language (XML)
Participating Experts: 2
Points: 300
Comments: 21

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Answers

by: b1xml2Posted on 2001-12-31 at 00:23:14ID: 6702096

Before I can go ahead and submit a sample code, I need further clarification:

1. How are you going to persist the change of user details?
In this regard, changing the user details on the client-side is all well and good, but the changes must be uploaded to the server itself. Am I correct in assuming that the data is stored in XML files on the web server.
2. When you say that you want a solution with XML and XSLT, are you referring to server-side transformations or client-side? Will you be using IIS and if so what parser have you installed on the server?
3.XML Data Islands is a Microsoft Extension which is being shelved on the quiet. It is not a standard even. XML Data Islands work best on MSIE 5.01+ and above. There are some problematic bugs in MSIE 5.0. The problem with using XML Data Islands is that you depend on the DEFAULT parser for MSIE which could be anything from MSXML2.0 to MSXML 2.6, 3.0, 3.0 SP1. Since Data Islands are a Microsoft extension, you would do better performing scripted transformations.

The requirements you have stated clearly comprises of more than one question. 200 points for the price of two rather lengthy (not difficult though) is too little. You won't receive much detailed help unless you break your question up to two parts with each question entailing 300 points because:-

1a. The XML Data Solution requires both XML and Javascript knowledge. Scripted Code is the recommended approach by MS. Data Islands are a thing of the past and they generally use the old MS XSL dialect which is no longer supported in the latest parser, MSXML4.

1b. The XML-XSLT Server-Side Solution requires both Javascript, Cross-Browser HTML, ASP (If you are using IIS)
knowledge.

The reason why developers who are totally new to the web and XML technologies will find it very hard to break into this field because there are some many components to the story, each of which is a specialised field in its own right.

by: nykitaPosted on 2001-12-31 at 08:14:24ID: 6702542

Hi b1xml2
Thanks for your informative and frank reply.
I have increased the points to 300 and I have decided to abandon the XML Islands approach on account of what you say.

The XML XSL transformations are client side. The server side is being handled by another developer who is developing on an AS/400.

I find it very difficult to know where to start at the moment. What you say about the different technologies is very true. I would be grateful for any other advice you can give.

Thanks

Nl

by: nykitaPosted on 2001-12-31 at 08:16:01ID: 6702545

The browser we intend using is MSIE 5.5 and up

NL

by: dwarePosted on 2001-12-31 at 10:57:02ID: 6702801

Simple solution for ya....
Here is the text xml document i used for this example.
<xml>
<state>tx</state>
<state>la</state>
<state>ny</state>
</xml>
Use the XMLDom object (MSXML2 or msxml3) all you need to to is

Dim allnodes
Dim node
Dim myxml
Set myxml = CreateObject("msxml2.domdocument")
Dim retval As Boolean
retval = myxml.Load("c:\test.xml")
Set allnodes = myxml.getElementsByTagName("state")
For x = 0 To allnodes.length - 1
listbox = allnodes.Item(x).Text
Next x

Let me know if this helps....
But it should be a really good start

by: dwarePosted on 2001-12-31 at 10:57:09ID: 6702802

by: nykitaPosted on 2001-12-31 at 16:59:39ID: 6703296

Thanks dware.
This partly answers my question, but how do I fill the table from the Customer xml and show the appropriate state selected if there is a state selected?

NL

by: b1xml2Posted on 2001-12-31 at 17:45:18ID: 6703337

nykita,
provide a sample code for each xml document and state your requirements, and we'll have both the javascript, html and xslt sample code in for you.

by: b1xml2Posted on 2001-12-31 at 19:14:42ID: 6703403

HTML Document
=============
<html>
<head>
<title>Customer Details</title>
<script language="javascript">
var oXML = new ActiveXObject("Msxml2.DOMDocument");
var oXSLT = new ActiveXObject("Msxml2.DOMDocument");
oXML.async = oXSLT.async = true;
oXML.load("xml/customer1.xml");
oXSLT.load("xslt/customer.xsl");
var eData = null;
window.onload = checkData;
function checkData() {
if (! eData) {
eData = document.getElementById("data");
if (! eData) return;
}
if (oXML.readyState != 4 || oXSLT.readyState != 4) {
window.setTimeout("checkData();",500);
} else {
eData.innerHTML = oXML.transformNode(oXSLT);
}
}

function setState(e) {
var eState = document.getElementById("state");
var eNa = document.getElementById("na");
if (e[e.selectedIndex].value == "US") {
eState.style.display = "";
eNa.style.display = "none";
} else {
eState.style.display = "none";
eNa.style.display = "";
}
}

function resetElements() {
var eForm = document.forms["customer"];
if (! eForm) return;
eForm.reset();
var eCountry = document.getElementById("country");
setState(eCountry);
}
</script>
<style>
body {background:#ffffff;font-family:Verdana,Tahoma;font-size:10pt;}
td, th, input, select {font-family:Verdana, Tahoma;font-size:10pt;}
td.subHeader {text-transform:capitalize;background:#00bfff;font-variant:small-caps;}
input.data, select.data {width:100%;}
input.buttons {width:150px;text-transform:capitalize;font-variant:small-caps;margin:2px;}
td.buttons {text-align:center;background:#4682b4;border-top:1px solid #000000;}
td.data {background:#fafad2;}
table.data {border:1px solid #000000;width:450px;}
td.mainHeader {text-align:center;font-variant:small-caps;background:#4682b4;color:#ffffff;border-bottom:1px solid #000000;letter-spacing:0.3mm;}
span.na {color:#800000;font-style:italic;}
</style>
</head>
<body>
<div id="data"></div>
</body>
</html>

by: b1xml2Posted on 2001-12-31 at 19:15:12ID: 6703405

Customer.xsl
============
<?xml version="1.0" encoding="windows-1252"?>
<xsl:stylesheet version="1.0"
      xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
      xmlns:msxsl="urn:schemas-microsoft-com:xslt"
      exclude-result-prefixes="msxsl">
<xsl:output method="html" encoding="windows-1252" indent="yes" />

<xsl:variable name="countries">
      <country acronym="RUS">Russia</country>
      <country acronym="US">United States</country>
      <country acronym="UK">United Kingdom</country>
</xsl:variable>

<xsl:variable name="us-states">
      <state>Ohio</state>
      <state>Oklahoma</state>
      <state>Missouri</state>
      <state>Georgia</state>
      <state>New Mexico</state>
      <state>Washington</state>
      <state>New England</state>
      <state>Maryland</state>
      <state>Pennsylvania</state>
      <state>Virginia</state>
      <state>Texas</state>
      <state>California</state>
</xsl:variable>
<xsl:template match="/">
<form name="customer" method="post" action="webpage.asp">
<input type="hidden" name="customerid" value="{customer/@id}" />
<table cellpadding="4" cellspacing="0" class="data">
      <col width="150" /><col width="300" />
      <tr>
            <td class="mainHeader" colspan="2">Customer Details</td>
      </tr>
      <xsl:choose>
      
      <xsl:when test="customer/*">
            
            <xsl:apply-templates select="customer/*" mode="customer" />
            
            
            <tr>
                  <td class="buttons" colspan="2">
                        <input type="submit" value="Submit" class="buttons" />
                        <input type="button" value="Reset" class="buttons" onclick="resetElements();"/>
                  </td>
            </tr>
      </xsl:when>
      <xsl:otherwise>
      <tr>
            <td class="empty" colspan="2">No Client Details Exist</td>
      </tr>
      </xsl:otherwise>
      </xsl:choose>
</table>
</form>
</xsl:template>

<xsl:template match="*" mode="customer">
<tr>
      <xsl:call-template name="subHeader" />
      <td class="data">
            <input type="text" class="data" value="{.}" id="{name()}" name="{name()}" />
      </td>
</tr>
</xsl:template>


<xsl:template match="country" mode="customer">
<xsl:variable name="country" select="." />
<tr>
      <xsl:call-template name="subHeader" />
      <td class="data">
            <select class="data" name="country" id="country" onchange="setState(this);">
                  <xsl:for-each select="msxsl:node-set($countries)/node()">
                  
                  <xsl:sort select="." />
                  <option value="{@acronym}">
                        <xsl:if test="@acronym = $country">
                              <xsl:call-template name="selected" />
                        </xsl:if>
                        <xsl:value-of select="." />
                  </option>
                  </xsl:for-each>
            </select>
      </td>
</tr>
</xsl:template>


<xsl:template match="state" mode="customer">
<xsl:variable name="state" select="." />
<xsl:variable name="country" select="following::country" />
<tr>
      <xsl:call-template name="subHeader" />
      <td class="data">
            <span id="na" class="na">
                  <xsl:if test="$country = 'US'">
                        <xsl:call-template name="no-display" />
                  </xsl:if>
                  Not Applicable</span>
            <select class="data" name="state" id="state">
                  <xsl:if test="$country != 'US'">
                        <xsl:call-template name="no-display" />
                  </xsl:if>
                  <xsl:for-each select="msxsl:node-set($us-states)/node()">
                  
                  <xsl:sort select="." />
                  <option value="{.}">
                        <xsl:if test=". = $state">
                              <xsl:call-template name="selected" />
                        </xsl:if>
                        <xsl:value-of select="." />
                  </option>
                  </xsl:for-each>
            </select>
      </td>
</tr>

</xsl:template>


<xsl:template name="no-display">
<xsl:attribute name="style">display:none;</xsl:attribute>
</xsl:template>


<xsl:template name="selected">
<xsl:attribute name="selected">selected</xsl:attribute>
</xsl:template>


<xsl:template name="subHeader">
<td class="subHeader"><xsl:value-of select="translate(name(),'.',' ')" /></td>
</xsl:template>
</xsl:stylesheet>

by: b1xml2Posted on 2001-12-31 at 19:17:03ID: 6703409

Customer1.xml
=============
<?xml version="1.0" encoding="windows-1252" standalone="yes"?>
<customer id="1234">
<first.name>John</first.name>
<middle.name>Williams</middle.name>
<surname>Yates</surname>
<age>36</age>
<street>123 Green Corner</street>
<town>Miller</town>
<state>Ohio</state>
<country>US</country>
</customer>

Customer2.xml
=============
<?xml version="1.0" encoding="windows-1252" standalone="yes"?>
<customer id="3456">
<first.name>Janice</first.name>
<middle.name>Grace</middle.name>
<surname>McDonald</surname>
<age>41</age>
<street>14B Paddington Street</street>
<town>London</town>
<state />
<country>UK</country>
</customer>

by: b1xml2Posted on 2001-12-31 at 19:28:06ID: 6703412

HTML Notes
==========
1. Typically for client-side transforms, it would be wise to have asynchronous loading so that nothing is locked up at the browser. This is achieved by setting the async property to true. If you set it to false, it means that nothing else is processed until the loading is completed. false is always set on the server and true is recommended on the client.

2. The CSS settings should be already exposed on the HTML page. This allows for the separation of your resulting HTML output and your XSLT files from any changes to the look and feel. The look and feel can be changed on the CSS and is independent of your XSLT which for the main, uses class and generic style attributes which do not affect the look and feel. You got to think of these issues when the web application starts to get big.

XML Notes
=========
1. To check whether the parser has fully loaded the XML documents, we check the readyState property. The value 4 indicates that the load has been completed.
2. transformNode() method will cause the transform to be performed with the output in string.

XSLT Notes
==========
1. Because the countries generally do not change, you could include them NOT as a separate XML document but as part of the XSLT. This also applies to the States in the US. That way, you have a comprehensive XSLT document that will NOT break if someone by mistake makes the countries.xml unloadable by adding improper XML syntax or worse still, by deleting it!
2. In the States portion, you have two potential elements for display. If the Country Is Not US, the span element na
will be displayed and the select element state will not be displayed and vice-versa.

Script Notes
============
1. Because of the display of "Not Applicable" For Non-US Customers in the State Category, there exists a need to ensure that
1a. whenever a country is changed from the US, to non-US or the reverse, you affect the display on the state.
1b. whenever a change has occurred in 1a and you hit on the reset button, the original values should be displayed.

CSS Notes
=========
1. Use CSS as much as possible, since your target browser is MSIE5.5. That way, if you need to change look and feel, you just change the CSS settings without even opening the XSLT documents.

Regards,

Brandon Driesen

Tips
====
changing the customer1.xml to customer2.xml and see what happens!

by: b1xml2Posted on 2001-12-31 at 19:30:08ID: 6703414

XML Parser Information
======================
1. You should have Msxml3 + installed on your box to test the sample code.
2. There are ways to install Msxml3+ on client browsers on-demand. I did this for my organisation as there were thousands of browsers within my organisation and a push model was not an option. If you want, I can provide the code on how to do this.

by: b1xml2Posted on 2001-12-31 at 19:35:10ID: 6703416

Further Notes On Design
==============================
1. Especially when dealing with XML Technologies, you must adopt a defensive strategy. Never make assumptions. Always code defensively:- Motto "What do I do if the item does not exist!".

2. Use the try..catch..finally statements everywhere to provide better error handling within javascript.

3. use the document.getElementById method over the document.all collection. This is the recommended w3c way.

Regards,

Brandon Driesen.

by: b1xml2Posted on 2001-12-31 at 20:31:41ID: 6703439

You can change the timer from 500 milliseconds to 50 milliseconds or any other value.

window.setTimeout("checkData();",50);

Notes
======
1. using the dom methods as shown by dware is not the wise thing to do when dealing with XML documents. XSLT is extremely powerful and it is quite right for you to reject his answer.

by: nykitaPosted on 2002-01-03 at 03:39:37ID: 6707319

Thank you very much b1xml2.

I am sorry for not getting back to you sooner but I could not near a PC for a few days.

I will try everything you have given me and I will get back to you.

Regards

NL

by: b1xml2Posted on 2002-01-03 at 03:57:36ID: 6707344

kewl nykita, I hope you enjoyed your holidays =)

by: nykitaPosted on 2002-01-04 at 06:47:06ID: 6710351

Thanks b1xml2

Your example is just what I needed. I have adapted it to do what I needed and everything works great. I downloaded msxml3.dll, msxml3a and msxml3r and registered them manually. However I could only register msxml3 sucessfully. Why is this? If you could let me nkow how to set up msxml3 on remote machines I would appreciate it.

Thanks again

NL

by: b1xml2Posted on 2002-01-04 at 07:04:31ID: 6710396

what type of installation - web or straight msi installation? You don't need to register the dll's. You need to just click on the exe file. You need to have Microsoft Windows Installer on your box.

I will now provide you the web code, on demand and it installs MSXML3 SP1.

The following script should be placed on the html page where you intend to use MSXML SP1.

<script language="javascript">

/***************PARSER CHECKING VERSION******************/
try {
//to hold the return value
var bolReturn = true;

//set the parser to MSXML3
var oCheckParser = new ActiveXObject("Msxml2.DOMDocument.3.0");

//synchronous loading
oCheckParser.async = false;

//load the XML Data
oCheckParser.loadXML("<?xml version='1.0'?><books><book>Test</book></books>");

//if loading fails for some odd reason
if (oCheckParser.parseError.errorCode != 0) throw "error";

//set properties accordingly
/************
PARSER SOUGHT AFTER: MSXML3 SP1
REASONS:
1. XMLHTTP Major Bug Fixed
2. XPATH Queries Optimised
3. XPATH Axes Queries Fixed

**************/

oCheckParser.setProperty("SelectionLanguage","XPath");
oCheckParser.setProperty("SelectionNamespaces","xmlns:my='urn:http://www.my.com/schema/'");
var oNodeList = oCheckParser.selectNodes("child::my:book");
var szExpected = "xmlns:my='urn:http://www.my.com/schema/'";
var szActual = oNodeList.getProperty("SelectionNamespaces");
if (szExpected != szActual) throw "error";

} catch (e) {
alert("You do not have the required Microsoft XML Parser Version 3.0 SP1 Installed.\nYou will now be taken to the software download page");
bolReturn = false;

} finally {
if ("object" == typeof(oCheckParser) && oCheckParser != null) {
delete oCheckParser; oCheckParser = null; CollectGarbage();
}

//throw to msxml3.asp which downloads the parser
if (bolReturn == false) window.location.replace("msxml3.html");

}
/*****************END OF PARSER CHECKING VERSION**********************/

</script>

by: b1xml2Posted on 2002-01-04 at 07:06:35ID: 6710401

This is the msxml3.html
=======================
<html>
<head>
<meta name="Module" content="JScript" />
</head>
<body>
<object id="MSXML3" classid="clsid: f5078f32-c551-11d3-89b9-0000f81fe221" codebase="software/msxml3.cab#version=8,10,8308,0" type="application/x-oleobject" style="display: none"></object>
<h1>Microsoft's XML Parser 3.0 SP1 Download</h1>
<p>This page downloads the correct parser version that is required for accessing this web application.</p>
</body>
</html>

by: b1xml2Posted on 2002-01-04 at 07:09:05ID: 6710409

Now that you do is download the cab file and place it on the web server virtual folder /software

This is the url for downloading the cab file
============================================
http://msdn.microsoft.com/downloads/sample.asp?url=/MSDN-FILES/027/001/650/msdncompositedoc.xml

by: b1xml2Posted on 2002-01-09 at 08:20:21ID: 6721035

and you are ready ....

20120131-EE-VQP-002

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