DOM - Node Object Method - lookupNamespaceURI


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The method lookupNamespaceURI gets the URI of the namespace associated with the namespace prefix, starting from current node.

Syntax

Following is the syntax for the usage of the lookupNamespaceURI method.

nodeObject.lookupNamespaceURI(DOMString prefix)

S.No. Parameter & Description
1

prefix

Based on this parameter namespace uri is return if present any. It is of type DOMString.

This method returns the associated namespace URI or null if none is found.

Example

node_ns.xml contents are as below −

<?xml version = "1.0"?>
<Company>
   <Employee xmlns:e = "http://www.tutorials.com/technical/" category = "technical">
      <e:FirstName>Tanmay</e:FirstName>
      <e:LastName>Patil</e:LastName>
      <e:ContactNo>1234567890</e:ContactNo>
      <e:Email>tanmaypatil@xyz.com</e:Email>
   </Employee>

   <Employee xmlns:n = "http://www.tutorials.com/non-technical/" category = "non-technical">
      <n:FirstName>Taniya</n:FirstName>
      <n:LastName>Mishra</n:LastName>
      <n:ContactNo>1234667898</n:ContactNo>
      <n:Email>taniymishra@xyz.com</n:Email>
   </Employee>
</Company>

Following example demonstrates the usage of the lookupNamespaceURI method −

<!DOCTYPE html>
<html>
   <head>
      <script>
         function loadXMLDoc(filename) {
            if (window.XMLHttpRequest) {
               xhttp = new XMLHttpRequest();
            } else // code for IE5 and IE6 {
               xhttp = new ActiveXObject("Microsoft.XMLHTTP");
            }
            xhttp.open("GET",filename,false);
            xhttp.send();
            return xhttp.responseXML;
         }
      </script>
   </head>
   <body>
      <script>
         xmlDoc = loadXMLDoc("/dom/node_ns.xml");

         y = xmlDoc.getElementsByTagName("Employee")[0];
         document.write("lookupNameSpaceURI is : ")
         document.write(y.lookupNamespaceURI("e"));
      </script>
   </body>
</html>

Execution

Save this file as nodemethod_namespaceuri.htm on the server path (this file and node_ns.xml should be on the same path in your server). We will get the output as shown below −

lookupNameSpaceURI is : http://www.tutorials.com/technical/
dom_node_object.htm

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