XML DOM compareDocumentPosition() methode
definitie en gebruik
De compareDocumentPosition() methode vergelijkt de documentpositie van de huidige node met de positie van de gespecificeerde node volgens de volgorde van het document.
Deze methode retourneert een nieuwe subnode.
syntaxis:
elementNode.compareDocumentPostition(node)
| parameter | beschrijving |
|---|---|
| node | Required. Specifies the node to be compared with the current node. |
Instance
In all examples, we will use the XML file books.xml, and the JavaScript function loadXMLDoc().
The following code snippet compares the first and third <book> nodes in "books.xml":
xmlDoc=loadXMLDoc("books.xml");
x=xmlDoc.getElementsByTagName('book')[0];
y=xmlDoc.getElementsByTagName('book')[2];
document.write(x.compareDocumentPosition(y));
The output of the above code:
4
Note:Internet Explorer will ignore the whitespace text nodes generated between nodes (such as newline characters), while Mozilla does not. Therefore, in the above example, Mozilla outputs 4, while Internet Explorer outputs 2.
For more information about the differences between IE and Mozilla browsers, please visit the XML DOM tutorial on CodeW3C.com DOM browser This section.
