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XML DOM Node List

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DOM Node Liste und NamedNodeMap

Dieses Kapitel beschreiben dich, was ein NodeList ist und ein welches NamedNodeMap ist. Es erkl�rt auch die Unterschiede zwischen ihnen.



DOM Node-Liste

Wenn Sie Methoden oder Eigenschaften verwenden, childNodes m�gen, oder getElementsByTagName (), empfangen wir einen NodeList Gegenstand.

Ein NodeList Gegenstand stellt eine bestellte Liste von Nodesn dar.

Die Nodes im NodeList k�nnen mit ihrer Indexziffer erreicht werden (abfahrend von 0).

Anmerkung: In einem NodeList werden die Nodes in den Auftrag zur�ckgebracht, in dem sie in der XML Akte spezifiziert werden.

Die XML Akte betrachten, die bookdetails.xml XML DOM in der Nodeseite ist

Wir erstellen jetzt eine Nodeliste alles <title> Elements in �bookdetails.xml�, indem wir die getElementsByTagName (�Titel�) Methode verwenden. Das folgende Bild stellt die zur�ckgebrachte Nodeliste dar:



Das folgende Codefragment erhalten den Text vom ersten <title> Element:

getElementsByTagName("title")[0].childNodes[0].nodeValue
O/P:
Everyday Italian


Get the Length of a Node List

The node list always keeps itself up-to-date. If an element is added or deleted, in the node list or the XML document, the list is automatically updated.

The node list has a useful propertycalled length. The length property returns the number of node in a node list.

The following code fragment get the number of <title> elements in "bookdetails.xml":

getElementsByTagName('title').length
O/P:
4

When you know the length of node list, you can easily loop through it and extract the values you want.

The following code fragment loops through all <title> elements and print their values:

//the x variable will hold a NodeList
var x=getElementsByTagName('title'); for (i=0;i<x.length;i++)
{
document.write(x[i].childNodes[0].nodeValue)
document.write("<br />")
}
O/P:
Everyday Italian
Harry Potter
XQuery Kick Start
Learning XML


DOM NamedNodeMap

  • When using the attribute property on an element, we receive a NamedNodeMap object.
  • A NamedNodeMap object represent an unordered list of attribute nodes.
  • The nodes in the NamedNodeMap can be accessed using their name.
  • Note: In a NamedNodeMap, the nodes are not returned in any order.


  • Get the Length of a NamedNodeMap

    The NamedNodeMap always keeps itself up-to-date. If an element is added or deleted , in the node list or the XML document, the list is automatically updated.

    The NamedNodeMap also has length property. The length property returns the number of nodes in list.

    Look at the following XML file called bookdetails.xml in XML DOM Nodes page.

    The following code fragment get the number of attributes in the first <title> element in "bookdetails.xml":

    getElementsByTagName('title')[0].attributes.length
    O/P:
    1
    Get an Item's Value in a NamedNodeMap

    The getNamedItem() method of the NamedNodeMap object can be used to retrieve specified node.

    The following code fragment shows how to print the value of the "category" attribute in each <book> element:

    Last example will create a rectangle with rounded corner:

    xmlDoc=loadXMLDoc("bookdetailss.xml");
    var x=xmlDoc.getElementsByTagName("book");
    for(i=0;i<x.length;i++)
    {
    //the attlist variable will hold a NamedNodeMap
    var attlist=x.item(i).attributes;
    var att=attlist.getNamedItem("category");
    document.write(att.value + "<br />")
    }
    O/P:
    COOKING
    CHILDREN
    WEB
    WEB




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    Keywords: xml document, xml file, xml parser, xmldom microsoft.xmldom, text node, xml dom attribute, document object model


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