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Cassetto magico CodeW3C.com

Metodo getNamedItem() di XML DOM

Oggetto NamedNodeMap

Definizione e uso

getNamedItem() Il metodo restituisce il nodo con nome specifico (da namedNodeMap).

sintassi

namedNodeMap.getNamedItem(nodeName)

Parameters

Parameters	Description
nodeName	Required. String. The name of the node to return.

Technical details

DOM version:	Core Level 1
Return value:	Node object. Has a node with the specified name. If no node is marked in the mapping, then return null.

DOM version:

Core Level 1

Return value:

Node object. Has a node with the specified name.

If no node is marked in the mapping, then return null.

Example

The following code loads "books.xml" into xmlDoc, loops through the <book> elements, and prints the value of the category attribute:

var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
   if (this.readyState == 4 && this.status == 200) {
       myFunction(this);
   }
};
xhttp.open("GET", "books.xml", true);
xhttp.send();
function myFunction(xml) {
    var x, i, att, xmlDoc, txt;
    xmlDoc = xml.responseXML;
    txt = "";
    x = xmlDoc.getElementsByTagName('book');
    for (i = 0; i < x.length; i++) {
        att = x.item(i).attributes.getNamedItem("category");
        txt += att.value + "<br>";
    }
    document.getElementById("demo").innerHTML = txt;
}

Prova personalmente

Example 2

Change the value of the attribute:

var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
    if (this.readyState == 4 && this.status == 200) {
        myFunction(this);
    }
};
xhttp.open("GET", "books.xml", true);
xhttp.send();
function myFunction(xml) {
    var x, i, attlist, att, xmlDoc, txt;
    xmlDoc = xml.responseXML;
    txt = "";
    x = xmlDoc.getElementsByTagName("book");
    // Change the attribute value of the category attribute
    for (i = 0; i < x.length; i++) { 
        attlist = x.item(i).attributes;
        att = attlist.getNamedItem("category");
        att.value = "BESTSELLER";
    }
    // Output all title and edition
    for (i = 0; i < x.length; i++) { 
        txt += x[i].getAttribute("category") + "<br>";
    }
    document.getElementById("demo").innerHTML = txt; 
}