XML DOM - Replace Nodes

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XML DOM Tutorial
DOM HOME
DOM Introduction
DOM Nodes
DOM Node Tree
DOM Parsing
DOM Load Function
DOM Methods
DOM Accessing
DOM Node Info
DOM Node List
DOM Traversing
DOM Browsers
DOM Navigating
Manipulate Nodes
DOM Get Values
DOM Change Nodes
DOM Remove Nodes
DOM Replace Nodes
DOM Create Nodes
DOM Add Nodes
DOM Clone Nodes
DOM HttpRequest
XML DOM Reference
DOM Node Types
DOM Node
DOM NodeList
DOM NamedNodeMap
DOM Document
DOM DocumentImpl
DOM DocumentType
DOM ProcessingInstr
DOM Element
DOM Attribute
DOM Text
DOM CDATA
DOM Comment
DOM HttpRequest
DOM ParseError Obj
DOM Parser Errors
DOM Summary
Examples
DOM Examples
DOM Validator

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# XML DOM Replace Nodes

The replaceChild() method replaces a specified node.

The nodeValue property replaces text in a text node.

## Examples

The examples below use the XML file books.xml.
A function, loadXMLDoc(), in an external JavaScript is used to load the XML file.

Replace an element node
This example uses replaceChild() to replace the first <book> node.

Replace data in a text node
This example uses the nodeValue property to replace data in a text node.

## Replace an Element Node

The replaceChild() method is used to replace a node.

The following code fragment replaces the first <book> element:

    xmlDoc=loadXMLDoc("books.xml");

    x=xmlDoc.documentElement;

    //create a book element, title element and a text node
    newNode=xmlDoc.createElement("book");
    newTitle=xmlDoc.createElement("title");
    newText=xmlDoc.createTextNode("A Notebook");

    //add the text node to the title node,
    newTitle.appendChild(newText);
    //add the title node to the book node
    newNode.appendChild(newTitle);

    y=xmlDoc.getElementsByTagName("book")[0]
    //replace the first book node with the new node
    x.replaceChild(newNode,y);

Example explained:

1. Load "books.xml" into xmlDoc using loadXMLDoc()
2. Create a new element node <book>
3. Create a new element node <title>
4. Create a new text node with the text "A Notebook"
5. Append the new text node to the new element node <title>
6. Append the new element node <title> to the new element node <book>
7. Replace the first <book> element node with the new <book> element node

Try it yourself

## Replace Data In a Text Node

The replaceData() method is used to replace data in a text node.

The replaceData() method has three parameters:

- offset - Where to begin replacing characters. Offset value starts at zero
- length - How many characters to replace
- string - The string to insert

    xmlDoc=loadXMLDoc("books.xml");

    x=xmlDoc.getElementsByTagName("title")[0].childNodes[0];

    x.replaceData(0,8,"Easy");

Example explained:

1. Load "books.xml" into xmlDoc using loadXMLDoc()
2. Get the text node of the first <title> element node
3. Use the replaceDat method to replace the eight first characters from the text node with "Easy"

Try it yourself

## Use the nodeValue Property Instead

It is easier to replace the data in a text node using the nodeValue property.

The following code fragment will replace the text node value in the first <title> element with "Easy Italian":

    xmlDoc=loadXMLDoc("books.xml");

    x=xmlDoc.getElementsByTagName("title")[0].childNodes[0];

    x.nodeValue="Easy Italian";

Example explained:

1. Load "books.xml" into xmlDoc using loadXMLDoc()
2. Get the text node of the first <title> element node
3. Use the nodeValue property to change the text of the text node

Try it yourself

You can read more about changing node values in the Change Node chapter.

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