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In computer science and web development, XML Events is a W3C standard[1] for handling events that occur in an XML document. These events are typically caused by users interacting with the web page using a device, such as a web browser on a personal computer or mobile phone.
An XML Event is the representation of some asynchronous occurrence (such as a mouse button click) that gets associated with a data element in an XML document. XML Events provides a static, syntactic binding to the DOM Events interface, allowing the event to be handled.
The XML Events standard is defined to provide XML-based languages with the ability to uniformly integrate event listeners and associated event handlers with Document Object Model (DOM) Level 2 event interfaces. The result is to provide a declarative, interoperable way of associating behaviors with XML-based documents such as XHTML.
XML Events uses a separation of concernsdesign pattern, and is technology-neutral with regard to handlers. It gives authors freedom in organizing their code and allows separation of document content from scripting.
LegacyHTML and early SVG versions bind events to presentation elements by encoding the event name in an attribute name, such that the value of the attribute is the action for that event at that element. For example, (with JavaScript’s onclick attribute):
Stay <a href="http://www.example.org" onclick="window.alert('Hello!'); return false;">here</a>!
This design has three drawbacks:
Unlike DOM Events, which are usually associated with HTML documents, XML events are designed to be independent of specific devices. XML Events are used extensively in XForms and in version 1.2 of the SVG specification, as of July 2006, which is still a working draft.
以下は、XForms仕様におけるXMLイベントの使用方法の例です。
<html xmlns= "http://www.w3.org/1999/xhtml" xmlns:ev= "http://www.w3.org/2001/xml-events" xmlns:xf= "http://www.w3.org/2002/xforms" > <head> <ev:listener event= "DOMActivate" observer= "myButton" handler= "#doit" /> </head> <xf:trigger xml:id= "myButton" ><xf:label> Do it! </xf:label></xf:trigger> <script xml:id= "doit" type= "application/ecmascript" > alert("test"); </script> </html>この例では、DOMActivateid属性が のデータ要素でイベントが発生するとmyButton、ハンドラーdoit（たとえば、JavaScript要素）が実行されます。