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XML DOM isId Property

❮ Attr Object

Example

The following code fragment loads "books.xml" into xmlDoc and returns whether the category attribute is an ID attribute of the <book> element:

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.getElementsByTagName('book');
    for(i = 0; i < x.length; i++) {
        txt += x.item(i).attributes[0].isId + "<br>";
    }
    document.getElementById("demo").innerHTML = txt;
}
Try it Yourself »

Definition and Usage

The isId property returns true if an attribute is known to be of type ID (e.g. contains an identifier for its owner element), otherwise it returns false.

Syntax

attrObject.isId
❮ Attr Object