XML DOM - lookupPrefix Method

XML DOM - lookupPrefix Method


Hello folks! welcome back to a new edition of our tutorial on XML DOM. In this tutorial, we are going to be studying about the XML DOM lookupPrefix Method.

The XML DOM lookupPrefix method returns back the closest prefix that's defined in the current namespace for the namespace URI.

Syntax

The following below is the syntax to use the lookupPrefix Method -

nodeObject.lookupPrefix(DOMString namespace URI)

Parameter Details

S.No.Parameter & Description
1

namespaceURI

Based on this parameter prefix is returned. It is of type DOMString.


Return Value

This XML DOM method returns associated namespace prefix or null if none is found.

Example

Following below are the node.xml contents -

<?xml version = "1.0"?>
<Company>
   <Employee category = "Technical">
      <FirstName>Kennedy</FirstName>
      <LastName>Nkpara</LastName>
      <ContactNo>1234567890</ContactNo>
      <Email>kennedynkpara@xyz.com</Email>
   </Employee>
   
   <Employee category = "Non-Technical">
      <FirstName>Stephanie</FirstName>
      <LastName>Francis</LastName>
      <ContactNo>1234667898</ContactNo>
      <Email>stephaniefrancis@xyz.com</Email>
   </Employee>
   
   <Employee category = "Management">
      <FirstName>Justice</FirstName>
      <LastName>Dauglas</LastName>
      <ContactNo>1234562350</ContactNo>
      <Email>justicedauglas@xyz.com</Email>
   </Employee>
</Company>


The following example illustrates the usage of the lookupPrefix 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("lookupPrefix is : ")
         document.write(y.lookupPrefix("http://www.webdesigntutorialz.com/technical/"));
      </script>
   </body>
</html>

Output

Save file as nodemethod_lookupprefix.html on the server's path (this file and node.xml should be on the same path in your server). This gives us the following output below -

lookupPrefix is : e


Alright guys! This is where we are going to be rounding up for this tutorial post. In our next tutorial, we will be studying about XML DOM normalize Method.

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