XML DOM Set Nodes

pengyan 2006-11-30

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XML DOM Set Nodes

Examples

In the examples below, we will use the XML file books.xml, and the JavaScript function loadXMLDoc().

Set a new attribute and attribute value
This example uses setAttribute() to set a new attribute/attribute value.

Create a new attribute node
This example uses createAttribute() to create a new attribute node, and setAttributeNode() to insert it to an element.

Change an attribute‘s value
This example uses the setAttribute() method to change the value of an existing attribute.

Change an item‘s value
This example uses the getNamedItem() method to change the value of an existing attribute.

Set a New Attribute and Attribute Value

The setAttribute() method can be used to change the value of an existing attribute, or to create a new attribute/attribute value for an element.

The following code fragment adds a new attribute/attribute value to each <book> element:

xmlDoc=loadXMLDoc("books.xml");

var x=xmlDoc.getElementsByTagName("book");

for(i=0;i<x.length;i++)
            {
            x.item(i).setAttribute("edition","first");
            }

Another Way to Create a New Attribute

The createAttribute() is used to create a new attribute node.

The following code fragment uses createAttribute() to create a new attribute node, and setAttributeNode() to insert it to an element.:

xmlDoc=loadXMLDoc("books.xml");

var x=xmlDoc.getElementsByTagName(‘book‘);
            var newatt;

for (i=0;i<x.length;i++)
            {
            newatt=xmlDoc.createAttribute("edition").value="first";
            x[i].setAttributeNode(newatt);
            }

Change an Attribute Value

The setAttribute() method can be used to change the value of an existing attribute, or to create a new attribute/attribute value for an element.

The following code fragment changes the value of the existing "category" attribute (in each <book> element):

xmlDoc=loadXMLDoc("books.xml");

var x=xmlDoc.getElementsByTagName("book");

for(i=0;i<x.length;i++)
            {
            x.item(i).setAttribute("category","bestseller");
            }

Change an Item‘s Value

The getNamedItem() method can be used to change the value of an existing item.

The following code fragment also changes the value of the existing "category" attribute (in each <book> element):

xmlDoc=loadXMLDoc("books.xml");

var x=xmlDoc.getElementsByTagName("book");

for(i=0;i<x.length;i++)
            {
            var att=x.item(i).attributes.getNamedItem("category");
            att.value="bestseller";
            }