我正在使用此链接 (http://km0.la/js/mozXPath/) 提供的自定义 javascript 函数在 FireFox 中实现特定的 XML 功能。
这是代码:
// mozXPath
// Code licensed under Creative Commons Attribution-ShareAlike License
// http://creativecommons.org/licenses/by-sa/2.5/
if( document.implementation.hasFeature("XPath", "3.0") ) {
if( typeof XMLDocument == "undefined" ) { XMLDocument = Document; }
XMLDocument.prototype.selectNodes = function(cXPathString, xNode) {
if( !xNode ) { xNode = this; }
var oNSResolver = this.createNSResolver(this.documentElement);
var aItems = this.evaluate(cXPathString, xNode, oNSResolver,
XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
var aResult = [];
for( var i = 0; i < aItems.snapshotLength; i++) {
aResult[i] = aItems.snapshotItem(i);
}
return aResult;
}
XMLDocument.prototype.selectSingleNode = function(cXPathString, xNode) {
if( !xNode ) { xNode = this; }
var xItems = this.selectNodes(cXPathString, xNode);
if( xItems.length > 0 ){ return xItems[0]; }
else{ return null; }
}
Element.prototype.selectNodes = function(cXPathString) {
if(this.ownerDocument.selectNodes) {
return this.ownerDocument.selectNodes(cXPathString, this);
}
else { throw "For XML Elements Only"; }
}
Element.prototype.selectSingleNode = function(cXPathString) {
if(this.ownerDocument.selectSingleNode) {
return this.ownerDocument.selectSingleNode(cXPathString, this);
}
else { throw "For XML Elements Only"; }
}
}
假设 XML 对象已经定义并加载了 XML 内容,下面是一个如何访问名为“cd_rank”的 XML 标记的示例:
var cd_rank_XMLObj = XMLObj.selectSingleNode("cd_rank");
我想要做的是将属性“nodeTypedValue”添加到 selectSingleNode() 函数中,但我不知道该怎么做。在 Element.prototype.selectSingleNode 函数中,我尝试添加:
this.prototype.nodeTypedValue = this.textContent;
但是,它给了我一个错误,说它是未定义的。我什至尝试将它添加到函数之外,只是为了简化它并了解概念,它还说它是未定义的:
var XMLObj.selectSingleNode.prototype.nodeTypedValue = XMLObj.textContent;
alert(XMLObj.selectSingleNode("cd_rank").nodeTypedValue);
我想,基本上我想要做的是将原型属性添加到原型函数。但我需要一些帮助。如何添加“nodeTypedValue”以便编写“XMLObj.selectSingleNode(Path).nodeTypedValue”?