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CHAPTER 9: Integrating XML into JavaScript The XML Object 239

Accessing XML attributes

Attribute are properties of their parent elements. In ExtendScript, access an attribute name by using a

preceding at-sign (

@). An attribute property is a one-element list, which contains an XML object for the

value of the attribute. For example:

bookstoreXML.book [0].@category;

This returns the category attribute of the first book, whose value is the string “COOKING”.

To access all

category attributes of all books, use this statement:

bookstoreXML.book.@category

You can reference a set of elements with a particular attribute value, using a predicate in this form:

element.(@attribute == value)

For example, this statement returns only book elements that have a category attribute with the value

"CHILDREN":

bookstoreXML.book.(@category == "CHILDREN");

Viewing XML objects

The XML object, like all ExtendScript objects, has a toString() method that serializes the contents into a

string. In this case, the string contains only the text content of the element, not the tags. For example, for

the element

<x>text</x>, the toString() method returns “text”.

This method is called when you evaluate the object in the JavaScript Console of the ExtendScript Toolkit. It

recreates the XML text that the object encapsulates. Thus, if you evaluate the object

bookstoreXML.book[1] in the Console, you see the XML text for the encapsulated tree, formatted with

line feeds and spaces:

> bookstoreXML.book[1];

<title lang="en">The Wonderful Wizard of Oz</title>

<author>L. Frank Baum</author>

</book>

If you evaluate an object with a text value, you see the text value. For example:

> bookstoreXML.book[1].@category;

CHILDREN

If you access multiple values, the values are concatenated:

> bookstoreXML.book.@category

COOKINGCHILDRENCHILDRENMUSIC

The toXMLString() method serializes the entire element, including the tags, into a string. For example, for

the element

<x>text</x>, the method returns “<x>text</x>”.

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EDOBE XDOM TAKE 6 IR - PRODUCTSHEET Especificaciones Pagina 239