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Initial release | November 1, 2007 |
---|---|
Stable release | 1.4 / September 18, 2015 |
Written in | Java |
Operating system | Cross-platform: JVM |
Type | Ajax framework |
License | Dual license: LGPL, Proprietary [1] |
Website | www |
ItsNat Natural AJAX, is an open-source Java component-based Ajax framework.
ItsNat simulates a virtual browser within a Java application running on the server. This virtual browser represents documents using the W3C's DOM Level 2 node tree, and documents can be changed at any time by external Java code running on the server. By means of AJAX, the real user's browser is kept in sync with the server's virtual browser, and can pass W3C DOM events to it. [2] This can for example be used for automatic testing of the real browser under the control of the server. [3]
As of version 1.3 [4] ItsNat provides a new stateless mode.
ItsNat focuses on server centric SEO compatible Single-page applications and web sites.
When the server DOM tree is modified using Java W3C DOM APIs by the developer, this modification is detected (firing DOM mutation events) and automatically sent to the real web browser as JavaScript DOM based code, synchronizing the client DOM accordingly, usually as response of an AJAX event (ItsNat is heavily based on AJAX).
The developer code in the server can register Java W3C DOM Event listeners listening for W3C DOM events, this listener registration is automatically propagated to the client. When the user, for instance, clicks a "listened" element, the real browser event is sent to the server using AJAX, converted to a W3C DOM event and received by the server based listener(s).
The original page layout is defined using pure HTML, XHTML, SVG, or XUL based templates with no logic. If the modification is big ItsNat provides "template fragments", a template fragment is a piece of markup that can be inserted (included) as DOM into the main tree statically or dynamically (typically as a response of a user/Ajax event).
To save server memory ItsNat provides a DOM tree node cache in a serialized form (as plain text not DOM) and DOM subtrees no longer used can be removed manually only in server saving memory (the client DOM remains untouched).
Despite same client-server DOM contract, ItsNat provides some tolerance to DOM nodes introduced by non-ItsNat JavaScript code, static zones in server can be managed by non-ItsNat JavaScript code, DOM subtrees removed only in server can be changed freely in client, and in some locations (between and at the end of head and body elements), "intrusive" nodes are tolerated.
In stateless mode, introduced in version 1.3, the client page sends the necessary custom data of the current state to the server usually through AJAX requests, the server with this data is able to reconstruct partially or fully the client DOM state going to be modified and generate the necessary JavaScript DOM code, returned to the client to bring it to a new state, usually modifying the client page DOM tree according to the action which motivated the request. This mode may be not so fine grane and performant than the stateful mode, however this approach is more easily scalable because there is no per client page data kept in server and therefore AJAX requests can be dispatched to different server nodes with no need of session data sharing or server affinity need in stateful mode.
ItsNat provides an optional Component system built using the core features of the framework. These components are AJAX based and inspired in Swing, reusing Swing as far as possible such as data and selection models, but ItsNat is not a Swing clone in the web and is not a pixel based web framework.
ItsNat provides several button types, text based components, labels, lists, tables, trees usually with content editable "in place".
Any HTML element can be a component, for instance any element can be a normal button, a check box, a radio button, any element list may be a combo or a list component, for instance a group of SVG circles may be a multiple selection list component. Components can be used to generate XML too.
ItsNat components are not intrusive because the component view (markup) is provided by the developer and attached to the component.
ItsNat is pure Java and runs in any Java Virtual Machine v1.5 as the minimum configuration and virtually any servlet-compliant container.
Google App Engine is supported, including AJAX with some limitations.
Google Chrome, Firefox, Internet Explorer 6+ (including v9), Opera 12.12+, and Safari 5.1.7+.
SVG plugins (including AJAX): Adobe SVG Viewer v3 , Savarese Ssrc (adds XUL to MSIE too), SVGWeb , and Batik as applet.
Dynamic HTML, or DHTML, is a term which was used by some browser vendors to describe the combination of HTML, style sheets and client-side scripts that enabled creation of interactive and animated documents. The application of DHTML was introduced by Microsoft with the release of Internet Explorer 4 in 1997.
Java applets were small applications written in the Java programming language, or another programming language that compiles to Java bytecode, and delivered to users in the form of Java bytecode. The user launched the Java applet from a web page, and the applet was then executed within a Java virtual machine (JVM) in a process separate from the web browser itself. A Java applet could appear in a frame of the web page, a new application window, Sun's AppletViewer, or a stand-alone tool for testing applets.
An HTML element is a type of HTML document component, one of several types of HTML nodes. HTML document is composed of a tree of simple HTML nodes, such as text nodes, and HTML elements, which add semantics and formatting to parts of document. Each element can have HTML attributes specified. Elements can also have content, including other elements and text.
A web application is application software that runs on a web server, unlike computer-based software programs that are run locally on the operating system (OS) of the device. Web applications are accessed by the user through a web browser with an active network connection. These applications are programmed using a client–server modeled structure—the user ("client") is provided services through an off-site server that is hosted by a third-party. Examples of commonly-used web applications include: web-mail, online retail sales, online banking, and online auctions.
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A user interface markup language is a markup language that renders and describes graphical user interfaces and controls. Many of these markup languages are dialects of XML and are dependent upon a pre-existing scripting language engine, usually a JavaScript engine, for rendering of controls and extra scriptability.
A server-side dynamic web page is a web page whose construction is controlled by an application server processing server-side scripts. In server-side scripting, parameters determine how the assembly of every new web page proceeds, including the setting up of more client-side processing.
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