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XML DOM lookupPrefix() Method

❮ Element Object

Example

The following code fragment loads "books_ns.xml" into xmlDoc and finds the prefix for the given namespace URI:

var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
   if (this.readyState == 4 && this.status == 200) {
       myFunction(this);
   }
};
xhttp.open("GET", "books_ns.xml", true);
xhttp.send();

function myFunction(xml) {
    var xmlDoc = xml.responseXML;
    var x = xmlDoc.getElementsByTagName("book")[0];
    document.getElementById("demo").innerHTML =
    x.lookupPrefix("https://www.w3schools.com/children/");
}

Output:

c
Try it Yourself »

Definition and Usage

The lookupPrefix() method returns the prefix matching the specified namespace URI on the current node.

Syntax

elementNode.lookupPrefix(URI)

Parameter Description
URI Required. The namespace URI for the prefix to find
❮ Element Object