XML学习错误（1）：大小写的问题

最新推荐文章于 2022-03-04 12:00:20 发布

转载最新推荐文章于 2022-03-04 12:00:20 发布 · 291 阅读

0 ·

CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/tyrael007/archive/2006/09/21/511093.html

本文介绍了一位编程新手在学习XMLDOM过程中遇到的一个具体错误案例，详细解释了如何定位问题并修复了因XSL标签大小写不一致导致的错误。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

       笔者是一个编程菜鸟，最近努力学习Ajax技术，感觉JS不太好驯服，但是本人依然不断努力。笔者认为把自己的编程错误记录下来，是对经验的积累，经验是慢慢积累的嘛。
      今天就是在学习XML DOM编程过程中，出现了一个错误，浏览器总是告诉我有一个参数无效，后来经过认真研究终于找到了。
       先把代码给大家看看吧。

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
2

<html>
3

<head>
4

<title></title>
5

</head>
8

<body onload="initializeBook();">
9

<h1> Wrox Press </h1>
10

<h3> Book Information </h3>
11

<TABLE BORDER="0" CELLSPACING="0" CELLPADDING="0">
12

<TR>
13

<TD>Title:</TD><TD><input id="txtTitle"></TD>
14

</TR>
15

<TR>
16

<TD>Publisher:</TD><TD><input id="txtPublisher"></TD>
17

</TR>
18

<TR>
19

<TD>Published Date:</TD><TD><input id="txtPubDate"></TD>
20

</TR>
21

<TR>
22

<TD>Abstract:</TD><TD><input id="txtAbstract"></TD>
23

</TR>
24

<TR>
25

<TD>Pages</TD><TD><input id="txtPages"></TD>
26

</TR>
27

<TR>
28

<TD>ISBN:</TD><TD><input id="txtISBN"></TD>
29

</TR>
30

<TR>
31

<TD>Price:</TD><TD><input id="txtPrice"></TD>
32

</TR>
33

</TABLE>
35

<input type="button" id="btnUpdate" value="Update Book Info" onclick="updateBookInfo();" />
37

<h3>Author:</h3>
39

<table>
40

<tr>
41

<td>Author:</td><td><input id="txtAuthor"></td>
42

</tr>
43

</table>
44

<input type="button" id="btnAddAuthor" value="Add Author" onclick="addAuthor();" />
45

<h3>Catagories:</h3>
46

<table>
47

<tr>
48

<td>Category:</td><td><input id="txtCategory"></td>
49

</tr>
50

</table>
51

<input type="button" id="btnAddCategory" value="Add category" onclick="addCategory();"/>
52

<XML id=docBook>
54

<Book>
55

</Book>
56

</XML>
57

var docBook;
60

function initializeBook()
61

{
62

docBook=document.all("docBook").XMLDocument;
63

docBook.async=false;
64

renderElements();
65

}
66

function createOrReplaceElement(sElementName,sElementValue,elementParent)
68

{
69

var elementItem;
70

var textValue;
71

var nodelistOldItem;
72

elementItem=docBook.createElement(sElementName);
74

textValue=docBook.createTextNode(sElementValue);
75

elementItem.appendChild(textValue);
76

nodelistOldItem=elementParent.getElementsByTagName(sElementName);
78

if (nodelistOldItem.length>0)
79

{
80

elementParent.replaceChild(elementItem,nodelistOldItem.item(0));
81

}
82

else
83

{
84

elementParent.appendChild(elementItem);
85

}
86

}
88

function updateBookInfo()
90

{
91

createOrReplaceElement("Title",txtTitle.value,docBook.documentElement);
92

createOrReplaceElement("Publisher",txtPublisher.value,docBook.documentElement);
93

createOrReplaceElement("PubDate",txtPubDate.value,docBook.documentElement);
94

createOrReplaceElement("Abstract",txtAbstract.value,docBook.documentElement);
95

createOrReplaceElement("Pages",txtPages.value,docBook.documentElement);
96

createOrReplaceElement("ISBN",txtISBN.value,docBook.documentElement);
97

createOrReplaceElement("Price",txtPubDate.value,docBook.documentElement);
98

renderElements();
100

}
101

102

function addAuthor()
103

{
104

var elementAuthor;
105

var textAuthor;
106

var nodelistAuthors;
107

var elementAuthors;
108

109

elementAuthor=docBook.createElement("Author");
110

textAuthor=docBook.createTextNode(txtAuthor.value);
111

elementAuthor.appendChild(textAuthor);
112

nodelistAuthors=docBook.getElementsByTagName("Authors");
113

if(nodelistAuthors.length==0)
114

{
115

elementAuthors=docBook.createElement("Authors");
116

docBook.documentElement.appendChild(elementAuthors);
117

}
118

else
119

{
120

elementAuthors=nodelistAuthors.item(0);
121

}
122

elementAuthors.appendChild(elementAuthor);
123

renderElements();
124

}
125

126

function addCategory()
127

{
128

var elementCategory;
129

var textCategory;
130

var nodelistRecSubjCategories;
131

var elementRecSubjCategories;
132

133

elementCategory=docBook.createElement("Category");
134

textCategory=docBook.createTextNode(txtCategory.value);
135

elementCategory.appendChild(textCategory);
136

nodelistRecSubjCategories=docBook.getElementsByTagName("RecSubjCategories");
137

138

if(nodelistRecSubjCategories.length==0)
139

{
140

elementRecSubjCategories=docBook.createElement("RecSubjCategories");
141

docBook.documentElement.appendChild(elementRecSubjCategories);
142

}
143

else
144

{
145

elementRecSubjCategories=nodelistRecSubjCategories.item(0);
146

}
147

148

elementRecSubjCategories.appendChild(elementCategory);
149

150

renderElements();
151

}
152

153

function renderElements()
154

{
155

document.all("divRawXML").innerText=docBook.xml;
156

bookInfo.innerHTML=docBook.transformNode(bookXSL.documentElement);
157

authorTable.innerHTML=docBook.transformNode(authorXSL.documentElement);
158

categoryTable.innerHTML=docBook.transformNode(categoryXSL.documentElement);
159

160

}
161

162

163

</script>
164

165

166

<XML id=bookXSL>
167

<DIV xmlns:xsl="http://www.w3.org/TR/wd-xsl">
168

<xsl:choose>
169

<xsl:when test="/Book/Title[. $ne$ '']">
170

<table border="0" cellpadding="1">
171

<tr>
172

<td>Title:</td><td><xsl:value-of select="/Book/Title"/></td>
173

</tr>
174

<tr>
175

<td>Publisher:</td><td><xsl:value-of select="/Book/Publisher"/></td>
176

</tr>
177

<tr>
178

<td>Published Date:</td><td><xsl:value-of select="/Book/PubDate"/></td>
179

</tr>
180

<tr>
181

<td>Abstract:</td><td><xsl:value-of select="/Book/Abstract"/></td>
182

</tr>
183

<tr>
184

<td>Pages:</td><td><xsl:value-of select="/Book/Pages"/></td>
185

</tr>
186

<tr>
187

<td>ISBN:</td><td><xsl:value-of select="/Book/ISBN"/></td>
188

</tr>
189

<tr>
190

<td>Price:</td><td><xsl:value-of select="/Book/Price"/></td>
191

</tr>
192

</table>
193

</xsl:when>
194

<xsl:otherwise>
195

Book Information not yet specified.
196

</xsl:otherwise>
197

</xsl:choose>
198

</DIV>
199

200

</XML>
201

202

<XML id=authorXSL>
203

<DIV xmlns:xsl="http://www.w3.org/TR/wd-xsl">
204

<table border="0" cellpadding="1">
205

<tr>
206

<td><strong>Authors</strong></td>
207

</tr>
208

<xsl:for-each select="/Book/Authors/Author">
209

<tr>
210

<td><xsl:value-of select="text()" /></td>
211

</tr>
212

</xsl:for-each>
213

</table>
214

</DIV>
215

</XML>
216

217

<XML id=categoryXSL>
218

<DIV xmlns:xsl="http://www.w3.org/TR/wd-xsl">
219

<table border="0" cellpadding="1">
220

<tr>
221

<td><strong>Categories</strong></td>
222

</tr>
223

<xsl:for-each select="/Book/RecSubjCategories/Category">
224

<tr>
225

<td><xsl:value-of select="text()" /></td>
226

</tr>
227

</xsl:for-each>
228

</table>
229

</DIV>
230

</XML>
231

232

<hr />
233

<h2>Book Information</h2>
234

<div id="bookInfo"></div>
235

<div id="authorTable"></div>
236

<div id="categoryTable"></div>
237

<hr/>
238

The Text expression of the current contents of the DOM tree is:
239

<DIV id="divRawXML"></DIV>
240

241

242

</body>
243

</html>
244

245

出现问题的代码是这一行：

function renderElements()
2

{
3

document.all("divRawXML").innerText=docBook.xml;
4

bookInfo.innerHTML=docBook.transformNode(bookXSL.documentElement);
5

authorTable.innerHTML=docBook.transformNode(authorXSL.documentElement);
6

categoryTable.innerHTML=docBook.transformNode(categoryXSL.documentElement);//出现问题的代码
7

}

可见，是categoryXSL.documentElement这个参数出了问题，也就是XSL出了问题，但是笔者查了半天也没搞明白，最后终于找到了代码的问题，原来出现错误的代码是这样的：

1  <XML id=categoryXSL>
2       <DIV xmlns:xsl="http://www.w3.org/TR/wd-xsl">
3         <table border="0" cellpadding="1">
4           <tr>
5             <td><strong>Categories</strong></td>
6           </tr>
7           <xsl:for-each select="/Book/RecSubjCategories/Category">
8              <tr>
9                <td><xsl:value-of select="text()" /></td>
10              </tr>
11           </xsl:for-each>
12         </table>
13       </div>
14     </XML>

出问题的原因是，由于上面的<DIV xmlns:xsl="http://www.w3.org/TR/wd-xsl">是大写的，而结尾确是小写，自然会有问题，所以把</div>改为</DIV>就可以了，即：

<XML id=categoryXSL>
      <DIV xmlns:xsl="http://www.w3.org/TR/wd-xsl">
        <table border="0" cellpadding="1">
          <tr>
            <td><strong>Categories</strong></td>
          </tr>
          <xsl:for-each select="/Book/RecSubjCategories/Category">
             <tr>
               <td><xsl:value-of select="text()" /></td>
             </tr>
          </xsl:for-each>
        </table>
      </DIV>
    </XML>

转载于:https://www.cnblogs.com/tyrael007/archive/2006/09/21/511093.html