DOM - Node Object Method - replaceChild


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The method replaceChild is used to replace old child node with a new node. This returns the node replaced.

Syntax

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

nodeObject.replaceChild(Node newChild, Node oldChild)

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.

This method returns the node replaced.

Example

node.xml contents are as below −

<?xml version = "1.0"?>
<Company>
   <Employee category = "Technical">
      <FirstName>Tanmay</FirstName>
      <LastName>Patil</LastName>
      <ContactNo>1234567890</ContactNo>
      <Email>tanmaypatil@xyz.com</Email>
   </Employee>
   
   <Employee category = "Non-Technical">
      <FirstName>Taniya</FirstName>
      <LastName>Mishra</LastName>
      <ContactNo>1234667898</ContactNo>
      <Email>taniyamishra@xyz.com</Email>
   </Employee>
   
   <Employee category = "Management">
      <FirstName>Tanisha</FirstName>
      <LastName>Sharma</LastName>
      <ContactNo>1234562350</ContactNo>
      <Email>tanishasharma@xyz.com</Email>
   </Employee>
</Company>

Following example demonstrates 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("tanu@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>

Execution

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

After Replacement : tanu@xyz.com
dom_node_object.htm
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