XML DOM | replaceChild Method

XML DOM - replaceChild 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 replaceChild Method.

The XML DOM replaceChild method is used to replace old child node with a new node.

Syntax

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

nodeObject.replaceChild(Node newChild, Node oldChild)

Parameter Details

S.No.Parameter & Description
1

newChild

It is the new child to be replaced with the old child. It is of type Node.

2

oldChild

this parameter is replaced by the new child. It is of type Node.


Return Value

This method returns the replaced node.

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 replaceChild 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.xml");

         x = xmlDoc.documentElement;

         create_e1 = xmlDoc.createElement("Employee");
         create_e2 = xmlDoc.createElement("Email");
         create_t = xmlDoc.createTextNode("gift@xyz.com");

         create_e2.appendChild(create_t);
         create_e1.appendChild(create_e2);

         y = xmlDoc.getElementsByTagName("Employee")[0]
         x.replaceChild(create_e1,y);

         z = xmlDoc.getElementsByTagName("Email")[0];
         document.write("After Replacement  : ")
         document.write(z.childNodes[0].nodeValue);

      </script>
   </body>
</html>

Output

Save file as nodemethod_replacechild.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 -

After Replacement : gift@xyz.com


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 removeChild Method.

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