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 insertBefore Method.
The XML DOM insertBefore method inserts a new node before a specified child node of the current node.
The XML DOM insertBefore method inserts a new node before a specified child node of the current node.
Syntax
The following below is the syntax to use the insertBefore Method -
nodeObject.insertBefore(Node newChild, Node refChild)
Parameter Details
S.No. | Parameter & Description |
---|---|
1 | newChild It is the new node to be added. It is of type Node. |
2 | refChild It is used as a reference node before which a new node is added. It is of type Node. |
Return Value
This method returns the inserted 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 insertBefore 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"); create_e = xmlDoc.createElement("Email"); f1 = xmlDoc.documentElement; f2 = xmlDoc.getElementsByTagName("Email"); document.write("No of Email elements before insert operation: " + f2.length); document.write(" <br>"); f1.insertBefore(create_e,f2[3]); f2 = xmlDoc.getElementsByTagName("Email"); document.write("No of Email elements after insert operation: " + f2.length); </script> </body> </html>
Output
Save file as nodemethod_insertbefore.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 -
No of Email elements before insert operation: 3 No of Email elements after insert operation: 4
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 isDefaultNamespace Method.
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Thanks for reading and bye for now.