javascript/ajax help needed
How 开发者_高级运维can I get the document object out of this?
var xmlobject = (new DOMParser()).parseFromString(xmlstring, "text/xml");
In your example, xmlobject
is the document object, according to MDC. According to w3schools, on IE, you need to use an IE-specific ActiveX object instead of DOMParser
:
var xmlDoc, parser;
if (window.DOMParser) {
parser = new DOMParser();
xmlDoc = parser.parseFromString(text,"text/xml");
}
else { // Internet Explorer
xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
xmlDoc.async="false";
xmlDoc.loadXML(text);
}
You've said that getElementById
isn't working. Note that id
is not a special attribute (an attribute of type "ID") in XML by default, so even if you're giving elements an id
attribute, getElementById
won't work (it should return null
). Details in the W3C docs for getElementById
. I've never done it, but I assume you'd assign an attribute the "ID" type via a DTD.
Without one, though, you can use other traversal mechanisms. For example (live copy):
var xmlDoc, parser, text, things, index, thing;
text =
'<test>' +
'<thing>Thing 1</thing>' +
'<thing>Thing 2</thing>' +
'</test>';
if (window.DOMParser) {
parser = new DOMParser();
xmlDoc = parser.parseFromString(text,"text/xml");
}
else { // Internet Explorer
xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
xmlDoc.async="false";
xmlDoc.loadXML(text);
}
things = xmlDoc.documentElement.getElementsByTagName('thing');
for (index = 0; index < things.length; ++index) {
thing = things.item(index);
display(index + ": " + getText(thing));
}
...where getText
is:
function getText(element) {
return textCollector(element, []).join("");
}
function textCollector(element, collector) {
for (node = element.firstChild; node; node = node.nextSibling) {
switch (node.nodeType) {
case 3: // text
case 4: // cdata
collector.push(node.nodeValue);
break;
case 8: // comment
break;
case 1: // element
if (node.tagName == 'SCRIPT') {
break;
}
// FALL THROUGH TO DEFAULT
default:
// Descend
textCollector(node, collector);
break;
}
}
return collector;
}
(getText
is a good example of why I use libraries like jQuery, Closure, Prototype, YUI, or any of several others for this stuff. You'd think it would be simple to get the text inside an element, and it is if the element has exactly one text node inside it [as our thing
s do above]. If it doesn't, well, it gets complicated fast.)
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