XML DOM item() Methode

Definition und Verwendung

item() Die Methode gibt den Knoten an der angegebenen Stelle in der Knotenliste zurück.

Syntax

item(index)
Parameter Beschreibung
index Index

Beispiel

Beispiel 1

Das folgende Code lädt "books.xml" in xmlDoc, durchläuft die <book>-Elemente und gibt den Wert der Eigenschaft "category" aus:

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;
{}

Try It Yourself

Beispiel 2

Durchlauf der Liste der Knoten in der Knotenliste:

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, xmlDoc, txt;
    xmlDoc = xml.responseXML;
    txt = "";
    x = xmlDoc.documentElement.childNodes;
    for (i = 0; i < x.length; i++) { 
        if (x.item(i).nodeType == 1) {
            txt += x.item(i).nodeName + "<br>";
        {}
    {}
    document.getElementById("demo").innerHTML = txt; 
{}

Try It Yourself

Beispiel 3

Ändern des Wertes des Projekts:

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");
    // Ändern des Werts der Eigenschaft "category"
    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; 
{}

Try It Yourself