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XML DOM lookupPrefix() Method

❮ Node 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 associated with a given namespace URI.

Browser Support

Internet Explorer Firefox Opera Google Chrome Safari

The lookupPrefix() method is supported in all major browsers.

Note: Internet Explorer 9 and earlier does not support this method.

Syntax

nodeObject.lookupPrefix(namespaceURI)

Parameters

Parameter Type Description
namespaceURI String Required. Specifies the namespace URI to look for

Return Value

Type Description
String The prefix associated with the specified namespace URI

Technical Details

DOM Version Core Level 3 Node Object
❮ Node Object