使用JavaScript解析XML文件
[英]Using JavaScript to parse an XML file
问题描述
I am new to Stack OverFlow and coding in general. 
我是Stack OverFlow和编码的新手。 I am trying to take an XML file and render it in the browser using JavaScript. 我正在尝试获取XML文件并使用JavaScript在浏览器中呈现它。 I have looked around at some sample code of how to do this and came up with the following code: 我查看了一些如何执行此操作的示例代码，并提出了以下代码：
<!DOCTYPE html>
<html>
<body>
<script>
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.open("GET","social.xml",false);
xmlhttp.send();
xmlDoc=xmlhttp.responseXML;
document.write("<table border='1'>");
var x=xmlDoc.getElementsByTagName("CD");
for (i=0;i<x.length;i++)
{
document.write("<tr><td>");
document.write(x[i].getElementsByTagName("c_id")[0].childNodes[0].nodeValue);
document.write("</td><td>");
document.write(x[i].getElementsByTagName("facebook_id")[0].childNodes[0].nodeValue);
document.write("</td></tr>");
}
document.write("</table>");
</script>
</body>
</html>
Anyway, when I run this on my local server none of the data that I am trying to display in the table appears. 无论如何，当我在本地服务器上运行它时，我试图在表中显示的数据都不会出现。 My .html file and .xml file are in the same folder, so I believe I have the correct file pathway. 我的.html文件和.xml文件在同一个文件夹中，所以我相信我有正确的文件路径。 I could just be making a rookie mistake here, but I can't for the life of me figure out why a table listing the c_id and facebook_id values is not being created. 我可能只是在这里犯了一个菜鸟错误，但我不能为我的生活弄清楚为什么没有创建列出c_id和facebook_id值的表。 I looked around for answers and haven't been able to find any. 我四处寻找答案，但却找不到任何答案。 Any help would be greatly appreciated. 任何帮助将不胜感激。 Thanks! 谢谢！
1 个解决方案
解决方案1
14 已采纳 2012-11-02 23:31:48
You need to add an onload event listener to the xmlhttprequest before sending the request. 在发送请求之前，您需要向xmlhttprequest添加onload事件侦听器。 Also, you might need to parse the XML with a DOMParser . 此外，您可能需要使用DOMParser解析XML。 Anyway, this should work on modern browsers: 无论如何，这应该适用于现代浏览器：
<!DOCTYPE html>
<html>
<body>
<script>
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
xmlhttp=new XMLHttpRequest();
}
else
{// code for IE6, IE5
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.onload = function() {
var xmlDoc = new DOMParser().parseFromString(xmlhttp.responseText,'text/xml');
console.log(xmlDoc);
document.write("<table border='1'>");
var x=xmlDoc.getElementsByTagName("CD");
for (i=0;i<x.length;i++)
{
document.write("<tr><td>");
document.write(x[i].getElementsByTagName("c_id")[0].childNodes[0].nodeValue);
document.write("</td><td>");
document.write(x[i].getElementsByTagName("facebook_id")[0].childNodes[0].nodeValue);
document.write("</td></tr>");
}
document.write("</table>");
}
xmlhttp.open("GET","social.xml",false);
xmlhttp.send();
</script>
</body>
</html>
Now, just a couple of things worth mentioning about what you're doing: 现在，只有几件值得一提的关于你正在做的事情：
xmlhttprequestobjects have many different parameters that mean a variety of things:readystate, status code, the works.xmlhttprequest对象有许多不同的参数，意味着各种各样的东西：readystate，status code，works。 You might benefit looking a bit more into those.您可能会从中获益更多。 document.writeshould really never be used, ever.永远不应该使用document.write。 In fact, any means of HTML injection should be handled very carefully.事实上，任何HTML注入方式都应该非常谨慎地处理。 You could use a template-based solution common in many MVC-esque frameworks, or mine if you want :) 您可以使用许多MVC-esque框架中常见的基于模板的解决方案，如果您愿意，可以使用我的 :)
声明:本站的技术帖子网页，遵循CC BY-SA 4.0协议，如果您需要转载，请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.