Javascript里使用Dom操作Xml

一．Xml文件

二．IXMLDOMDocument/DOMDocument简介
2．1 属性
2．1．1  parseError
2．1．2  async.
2．1．3  xml
2．1．4  text 3
2．1．5  attributes
2．1．6  nodeName
2．1．7  documentElement
2．1．8  nextSibling
2．1．9  childNodes
2．1．10  firstChild
2．1．11  lashChild
2．2 方法
2．2．1  loadXML
2．2．2  load
2．2．3  selectSingleNode
2．2．4  selectNodes
2．2．5  getElementsByTagName
2．2．6  hasChildNodes

三．例子

一．Xml文件

<?xml version="1.0"?>

<book level="1">
  <Name>c++</Name>
  <Price>20</Price>
 <info>
<k>1</k>
  </info>
  <info>
    <k>2</k>
  </info>
</book>

在asp.net下实现代码：

string str = Server.MapPath("test1.xml");
XmlTextWriter xmlWriter = new XmlTextWriter(str,null);
xmlWriter.Formatting = System.Xml.Formatting.Indented;
xmlWriter.WriteStartDocument();
xmlWriter.WriteStartElement("book");
xmlWriter.WriteAttributeString("level","1");
xmlWriter.WriteElementString("Name","c++");
xmlWriter.WriteElementString("Price","20");
xmlWriter.WriteStartElement("info");
xmlWriter.WriteElementString("k","1");
xmlWriter.WriteEndElement();
xmlWriter.WriteStartElement("info");
xmlWriter.WriteElementString("k","2");
xmlWriter.WriteEndElement();
xmlWriter.WriteEndElement();
xmlWriter.WriteEndDocument();
xmlWriter.Close();

二．IXMLDOMDocument/DOMDocument简介

2．1 属性

2．1．1  parseError

Returns an IXMLDOMParseError object that contains information about the last parsing error

返回解析错误时的一个对象。

重要的有parseError.errorCode,parseError.reason

如果load时路径不对，会返回“系统未找到指定的对象”的错误

2．1．2  async

Specifies whether asynchronous download is permitted

是否允许异步下载，布尔值

2．1．3  xml

Contains the XML representation of the node and all its descendants. Read-only.

该点及下面派生的所有点的全部信息，只读如果要求book点的xml,返回“<book level="1"><Name>c++</Name><Price>20</Price><info><k>1</k></info><info><k>2</k></info></book>”，如果Name的xml，返回“<Name>c++</Name>”

2．1．4  text

Represents the text content of the node or the concatenated text representing the node and its descendants. Read/write

该点及下面派生的所有点的全部节点值，可读可写

<price>20</price>

则text为20

"Name"节点的text为"c++"

2．1．5  attributes

Contains the list of attributes for this node

返回属性的集合。

2．1．6  nodeName

Returns the qualified name for attribute, document type, element, entity, or notation nodes. Returns a fixed string for all

other node types. Read-only

该节点名称

"Name"节点的nodeName为"Name","book"节点的nodeName为"book"

2．1．7  documentElement

Contains the root element of the document

xml的根节点

上面的xml的根节点为"book"

2．1．8  nextSibling

Contains the next sibling of the node in the parent's child list. Read-only.

下一个兄弟节点，只读

2．1．9  childNodes

Contains a node list containing the child nodes

所有的子节点。

2．1．10  firstChild

Contains the first child of the node

第一个子节点

2．1．11  lastChild

Returns the last child node

最后一个子节点

2．2 方法

2．2．1  loadXML

Loads an XML document using the supplied string

2．2．2  load

Loads an XML document from the specified locati

参数的路径为服务器端的，是相对路径

2．2．3  selectSingleNode

Applies the specified pattern-matching operation to this node's context and returns the first matching node

返回第一个匹配的项

2．2．4  selectNodes

Applies the specified pattern-matching operation to this node's context and returns the list of matching nodes as IXMLDOMNodeList

符合条件的所有项。

2．2．5  getElementsByTagName

Returns a collection of elements that have the specified name

返回与元素名匹配的一个node的集合

2．2．6  hasChildNodes

Provides a fast way to determine whether a node has children

判断是否含有子节点

返回值为bool值

三．例子

var xmlDoc = new ActiveXObject("Msxml2.DOMDocument.3.0");

xmlDoc.async = false;

xmlDoc.load("test\\test1.xml");

if (xmlDoc.parseError.errorCode!=0)

{

var error = xmlDoc.parseError;

  alert(error.reason)

return;

}

var root = xmlDoc.documentElement;   //根节点

Form1.test1.value = root.xml;

/*结果如下：

<book level="1"><Name>c++</Name><Price>20</Price><info><k>1</k></info><info><k>2</k></info></book>*/

Form1.test1.value = root.nodeName;  //结果为"book"

var att = root.attributes;  //得到该点下所有属性的集合

var str = "";

for (var i=0; i<att.length; i++)

{

str += att.item(i).nodeName+":"+att.item(i).text;

}

Form1.test1.value = str;  //只有一个属性，所以结果为“level：1”

var fNode;

var lNode;

var nextSibling;

fNode = root.firstChild;   //第一个子节点Name

lNode = root.lastChild;    //最后一个子节点 info

nextSibling = fNode.nextSibling;  //第一个子节点Name的后一个兄弟节点，即Price

str = fNode.nodeName + ":" + fNode.text;  //结果："Name:c++"

str = lNode.nodeName + ":" + lNode.text;  //结果为："info:2"

str = nextSibling.nodeName + ":"  + nextSibling.text;  //结果为:"Price:20"

var nodeList;

str = "";

nodeList = xmlDoc.selectNodes("//info");  //查找元素名为"info"的节点

for (var j=0; j<nodeList.length; j++)  //有两个info节点

{

var infoNode = nodeList.item(j);

var cldNodes = infoNode.childNodes;  //info节点的子节点集

for (var k=0; k<cldNodes.length; k++)

{

       str += cldNodes.item(k).nodeName + ":" + cldNodes.item(k).text + " ";

}

//结果“k:1 k:2 ”

}

str = "";

var sNode;

sNode = xmlDoc.selectSingleNode("//info"); //找到第一个和"info"匹配的

var scldNodes = sNode.childNodes;  //info节点的子节点集

for (var t=0; t<scldNodes.length; t++)

{

str += scldNodes.item(t).nodeName + ":" + scldNodes.item(t).text + " ";

}

//结果“k:1”

Form1.test1.value = str;