js在xml中根据日期使用xpath查询记录的方法

编者：李国帅

qq：9611153 微信lgs9611153

时间：2008-11-27 9:38

背景原因:

很久之前碰到的问题，觉得有意思分享一下。

解决方案:

<HTML>

<HEAD>

<TITLE>Example</TITLE>

</HEAD>

<BODY>

Date.prototype.Format = function (fmt) { //author: meizz

var o = {

"M+": this.getMonth() + 1, //月份

"d+": this.getDate(), //日

"h+": this.getHours(), //小时

"m+": this.getMinutes(), //分

"s+": this.getSeconds(), //秒

"q+": Math.floor((this.getMonth() + 3) / 3), //季度

"S": this.getMilliseconds() //毫秒

};

if (/(y+)/.test(fmt)) fmt = fmt.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));

for (var k in o)

if (new RegExp("(" + k + ")").test(fmt)) fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));

return fmt;

}

//=================直接使用xpath=================

function test0()

{

var xmlDoc = new ActiveXObject("Msxml2.DOMDocument.5.0");

var oNamedNodeMap;

xmlDoc.async = false;

xmlDoc.resolveExternals = false;

//xmlDoc.load("lib/DebugLog.xml");

xmlDoc.loadXML('<DebugLogSet><DebugLog Id="1" File="f:\\project\\tsclient\\config_info.cpp" Line="78" Date="2008-10-15 18:7:23" Type="1" Info="TestEvent!" /></DebugLogSet>');

var currNode;

xmlDoc.setProperty("SelectionLanguage", "XPath");

//currNode = xmlDoc.documentElement.selectNodes("//*[@Line>'78']");//不需要> <

currNodes = xmlDoc.documentElement.selectNodes("*[starts-with(@Date, \"2008-10-15\")]");

currNode = xmlDoc.documentElement.selectNodes("*[contains(@Date, \"2008-10-15\")]");//XPath1.0 函数

//currNodes = xmlDoc.documentElement.selectNodes("*[compare(@Date, \"2008-10-15\")=0]");//XPath2.0 函数

alert(currNode.length);

////DebugLogSet[DebugLog[@Date>'2008-10-15 18:7:23' and @Date<'2008-10-15 20:0:0']]/text() //text()=标记值

}

//==================================

function getDatePath(sbdate,sedate)

{

// var sbdate = "2008-10-15";

// var sedate = "2008-10-15";

var bdate=new Date(Date.parse(sbdate.replace(/-/g,"\/")));

var edate=new Date(Date.parse(sedate.replace(/-/g,"\/")));

// alert(bdate.valueOf());

// alert(edate.valueOf());

// alert(bdate==edate);//false

// alert(bdate.valueOf()==edate.valueOf());//true

// alert(date.toDateString());

// date.setDate(date.getDate()+-2);

// alert(date.toDateString());

var xpath = "*[ false ";

while(bdate.valueOf()<=edate.valueOf())

{

var bdates = bdate.Format("yyyy-MM-dd");//bdate.toDateString()

xpath += " or starts-with(@Date, \""+bdates+"\")";

bdate.setDate(bdate.getDate()+1);

}

xpath += "]";

alert(xpath);//"*[starts-with(@Date, \"2008-10-15\")]"

return xpath;

}

//以下是测试用代码---------------------------------------------------------------------

function test1()

{

var xmlDoc = new ActiveXObject("Msxml2.DOMDocument.5.0");

var oNamedNodeMap;

xmlDoc.async = false;

xmlDoc.resolveExternals = false;

//xmlDoc.load("lib/DebugLog.xml");

xmlDoc.loadXML('<DebugLogSet><DebugLog Id="1" File="f:\\project\\tsclient\\config_info.cpp" Line="78" Date="2008-10-15 18:7:23" Type="1" Info="TestEvent!" /></DebugLogSet>');

var xpath = getDatePath("2008-10-15","2008-10-16");

var currNodes;

currNodes = xmlDoc.documentElement.selectNodes(xpath);//XPath1.0 函数

alert(currNodes.length);

if(currNodes.length>0){

var sdate = currNodes.item(0).attributes[1].nodeValue;

alert(sdate);

}

</SCRIPT>

<BUTTON onclick="test1()">Click Me!</BUTTON>

</BODY>

</HTML>