使用XmlHttpRequest的XML getAttribute()问题 [英] XML getAttribute() Question using XmlHttpRequest
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问题描述
因此，我在下面的这个XML文件(Devices.XML):我想让浏览器显示两个设备的名称，uuid和id.我有两个设备，一个叫ccat，另一个叫HAAS
设备1
So I have this XML file below (Devices.XML) below: I want to get the browser to display the name, uuid and id of my two devices. I have two devices, one named ccat and the other names HAAS
Device 1
<pre lang="C++">name="ccat"<br />
</pre><pre lang="C++">uuid="imts-demonstration"</pre><br />
<pre lang="C++">id="id1001"></pre>
设备2
Device 2
<pre lang="C++">name="HAAS"<br />
uuid="HAAS-minimil" <br />
id="id1002"></pre>
Devices.XML文件
Devices.XML file
<pre lang="xml"><?xml version="1.0" encoding="UTF-8" ?><br />
- <MTConnectDevices xmlns="urn:mtconnect.org:MTConnectDevices:1.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="urn:mtconnect.org:MTConnectDevices:1.1 http://www.mtconnect.org/schemas/MTConnectDevices_1.1.xsd"><br />
<Header version="1.1" sender="Company MTConnect Instance" creationTime="2010-08-26T19:00:47-07:00" instanceId="2" bufferSize="5000" /><br />
- <Devices><br />
- <Device sampleRate="10.0" name="ccat" iso841Class="1" uuid="imts-demonstration" id="id1001"><br />
<Description manufacturer="Company Name" serialNumber="Serial Number" /><br />
- <DataItems><br />
<DataItem category="EVENT" id="id1" name="avail" type="AVAILABILITY" /><br />
</DataItems><br />
- <Components><br />
- <Axes name="Axes" id="id105"><br />
- <DataItems><br />
<DataItem type="PATH_FEEDRATE" name="path_feedratefrt" category="SAMPLE" id="id2" units="MILLIMETER/SECOND" subType="ACTUAL" /><br />
</DataItems><br />
- <Components><br />
- <Rotary name="C" id="c"><br />
- <DataItems><br />
<DataItem category="SAMPLE" id="id3" name="Srpm" type="SPINDLE_SPEED" units="REVOLUTION/MINUTE" subType="ACTUAL" /><br />
</DataItems><br />
</Rotary><br />
- <Linear name="X" id="x"><br />
- <DataItems><br />
<DataItem category="SAMPLE" id="id4" name="Xabs" type="POSITION" units="MILLIMETER" subType="ACTUAL" /><br />
<DataItem category="SAMPLE" id="id5" name="Xfrt" type="AXIS_FEEDRATE" units="MILLIMETER/SECOND" subType="ACTUAL" /><br />
</DataItems><br />
</Linear><br />
- <Linear name="Y" id="y"><br />
- <DataItems><br />
<DataItem category="SAMPLE" id="id6" name="Yabs" type="POSITION" units="MILLIMETER" subType="ACTUAL" /><br />
<DataItem category="SAMPLE" id="id7" name="Yfrt" type="AXIS_FEEDRATE" units="MILLIMETER/SECOND" subType="ACTUAL" /><br />
</DataItems><br />
</Linear><br />
- <Linear name="Z" id="z"><br />
- <DataItems><br />
<DataItem category="SAMPLE" id="id8" name="Zabs" type="POSITION" units="MILLIMETER" subType="ACTUAL" /><br />
<DataItem category="SAMPLE" id="id9" name="Zfrt" type="AXIS_FEEDRATE" units="MILLIMETER/SECOND" subType="ACTUAL" /><br />
</DataItems><br />
</Linear><br />
</Components><br />
</Axes><br />
- <Controller name="Controller" id="id106"><br />
- <DataItems><br />
<DataItem category="EVENT" id="id10" name="block" type="BLOCK" /><br />
<DataItem category="EVENT" id="id11" name="execution" type="EXECUTION" /><br />
<DataItem category="EVENT" id="id12" name="mode" type="CONTROLLER_MODE" /><br />
<DataItem category="EVENT" id="id13" name="program" type="PROGRAM" /><br />
<DataItem category="EVENT" id="id14" name="line" type="LINE" /><br />
<DataItem category="CONDITION" id="id16" name="communications" type="COMMUNICATIONS" /><br />
<DataItem category="CONDITION" id="id17" name="temperature" type="TEMPERATURE" /><br />
</DataItems><br />
</Controller><br />
</Components><br />
</Device><br />
- <Device sampleRate="10.0" name="HAAS" iso841Class="1" uuid="HAAS-minimil" id="id1002"><br />
<Description manufacturer="Company Name" serialNumber="Serial Number" /><br />
- <DataItems><br />
<DataItem category="EVENT" id="iid1" name="avail" type="AVAILABILITY" /><br />
</DataItems><br />
- <Components><br />
- <Axes name="Axes" id="iid105"><br />
- <DataItems><br />
<DataItem type="PATH_FEEDRATE" name="path_feedratefrt" category="SAMPLE" id="iid2" units="MILLIMETER/SECOND" subType="ACTUAL" /><br />
</DataItems><br />
- <Components><br />
- <Rotary name="C" id="ic"><br />
- <DataItems><br />
<DataItem category="SAMPLE" id="iid3" name="Srpm" type="SPINDLE_SPEED" units="REVOLUTION/MINUTE" subType="ACTUAL" /><br />
</DataItems><br />
</Rotary><br />
- <Linear name="X" id="ix"><br />
- <DataItems><br />
<DataItem category="SAMPLE" id="iid4" name="Xabs" type="POSITION" units="MILLIMETER" subType="ACTUAL" /><br />
<DataItem category="SAMPLE" id="iid5" name="Xfrt" type="AXIS_FEEDRATE" units="MILLIMETER/SECOND" subType="ACTUAL" /><br />
</DataItems><br />
</Linear><br />
- <Linear name="Y" id="iy"><br />
- <DataItems><br />
<DataItem category="SAMPLE" id="iid6" name="Yabs" type="POSITION" units="MILLIMETER" subType="ACTUAL" /><br />
<DataItem category="SAMPLE" id="iid7" name="Yfrt" type="AXIS_FEEDRATE" units="MILLIMETER/SECOND" subType="ACTUAL" /><br />
</DataItems><br />
</Linear><br />
- <Linear name="Z" id="iz"><br />
- <DataItems><br />
<DataItem category="SAMPLE" id="iid8" name="Zabs" type="POSITION" units="MILLIMETER" subType="ACTUAL" /><br />
<DataItem category="SAMPLE" id="iid9" name="Zfrt" type="AXIS_FEEDRATE" units="MILLIMETER/SECOND" subType="ACTUAL" /><br />
</DataItems><br />
</Linear><br />
</Components><br />
</Axes><br />
- <Controller name="Controller" id="iid106"><br />
- <DataItems><br />
<DataItem category="EVENT" id="iid10" name="block" type="BLOCK" /><br />
<DataItem category="EVENT" id="iid11" name="execution" type="EXECUTION" /><br />
<DataItem category="EVENT" id="iid12" name="mode" type="CONTROLLER_MODE" /><br />
<DataItem category="EVENT" id="iid13" name="program" type="PROGRAM" /><br />
<DataItem category="EVENT" id="iid14" name="line" type="LINE" /><br />
<DataItem category="CONDITION" id="iid16" name="communications" type="COMMUNICATIONS" /><br />
<DataItem category="CONDITION" id="iid17" name="temperature" type="TEMPERATURE" /><br />
</DataItems><br />
</Controller><br />
</Components><br />
</Device></pre><br />
我假设为了使浏览器显示名称，id和uuid，我使用了getAttribute()命令，但是它不起作用.
这是我所拥有的
I''m assumining in order to get the browser to display the names, id and uuid, I use the getAttribute() command, but it''s not working.
Here is what I have
<pre lang="xml"><html><br />
<head><br />
<br />
<script type="text/javascript"><br />
if (window.XMLHttpRequest)<br />
{// code for IE7+, Firefox, Chrome, Opera, Safari<br />
xmlhttp=new XMLHttpRequest();<br />
}<br />
else<br />
{// code for IE6, IE5<br />
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");<br />
}<br />
xmlhttp.open("GET","Devices.xml",false);<br />
xmlhttp.send();<br />
xmlDoc=xmlhttp.responseXML;<br />
<br />
x=xmlDoc.getElementsByTagName(''Devices'');<br />
i=0;<br />
<br />
function displayDevices()<br />
{<br />
name=(x[i].getAttribute(''name'')[0].childNodes[0].nodeValue);<br />
uuid=(x[i].getAttribute(''uuid'')[0].childNodes[0].nodeValue);<br />
id=(x[i].getAttribute(''id'')[0].childNodes[0].nodeValue);<br />
txt="name: " + name + "<br />uuid: " + uuid + "<br />id: "+ id;<br />
document.getElementById("showDevices").innerHTML=txt;<br />
}<br />
</script><br />
</head><br />
<body onload="displayDevices()"><br />
<br />
<div id=''showDevices''></div><br />
<br />
</body><br />
</html>`</pre><br />
基本上，我希望浏览器显示以下内容:
Basically, I want my browser to display this:
Name: ccat
uuid: imts-demonstration
id: id1001
Name: HAAS
uuid: HAAS-minimil
id: id1001
但是每次打开浏览器时，我都会得到一个空白页面.我正在使用Firefox，顺便说一句.我正在使用此网站引用我的代码: http://www.w3schools.com/XML/xml_applications.asp [< ^ ]
有人知道我在做什么错吗?
But everytime I open my browser I get an empty page. I''m using firefox, btw. I was using this website to reference my code: http://www.w3schools.com/XML/xml_applications.asp[^]
does anyone know what I''m doing wrong?
推荐答案
我认为您应该使用模式来验证xml.首先使用xmlschema验证xml，然后尝试您的代码.
i think you should use schema to validate the xml . first validate the xml with your xmlschema then try your code.
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