XML DOM Replace Node

The replaceChild() method replaces the specified node.

The nodeValue property replaces the text in a text node.

实例

Try it Yourself - Example

The following example uses an XML filebooks.xml。
FunctionloadXMLDoc(), located in external JavaScript, is used to load the XML file.

Replace 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 the data in a text node.

Replace element nodes

The replaceChild() method is used to replace nodes.

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

Example

xmlDoc=loadXMLDoc("books.xml"); x=xmlDoc.documentElement; //Create new book element, title element, and 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 a new node x.replaceChild(newNode,y);

Try it Yourself »

Example explanation:

  1. UsageloadXMLDoc()put "books.xml" Load into xmlDoc
  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 this new text node to the new element node <title>
  6. Append this new element node <title> to the new element node <book>
  7. Replace the first <book> element node with the new <book> element node

Replace data in text nodes

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

The replaceData() method has three parameters:

  • offset - where to start replacing characters. The offset value starts at 0.
  • length - how many characters to replace
  • string - the string to insert

Example

xmlDoc=loadXMLDoc("books.xml");

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

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

Try it Yourself »

Example explanation:

  1. UsageloadXMLDoc()put "books.xml" Load into xmlDoc
  2. Get the text node of the first <title> element node
  3. Use the replaceData method to replace the first 8 characters of the text node with "Easy"

Use the nodeValue property instead

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

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

Example

xmlDoc=loadXMLDoc("books.xml");

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

x.nodeValue="Easy Italian";

Try it Yourself »

Example explanation:

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

You canChange NodeRead more about changing node values in this chapter.


other extensions