ExtJS
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`ExtJS <http://extjs.com>`_ is another foundation-stone, on which HSLayers
is build. 



It is a cross-browser JavaScript library for building rich internet applications. It includes:

    * High performance, customizable UI widgets

    * Well designed and extensible Component model

    * An intuitive, easy to use API

    * Commercial and Open Source licenses available

Ext JS supports all major web browsers including:

    * Internet Explorer 6+
    * FireFox 1.5+ (PC, Mac)
    * Safari 3+
    * Chrome 3+
    * Opera 9+ (PC, Mac)

ExtJS has little bit different style of `API documentation <http://www.extjs.com/deploy/dev/docs/>`_. 

* It has ready gui widgets for
    * Panel
    * Window
    * Forms
    * Grid
    * Button
    * ...
* It simplifies work with data, retrieved from the server (just define the
  data "source", Ext will render them for you
* It has advanced event manager
* ...

Let's have a look  at several objects

.. toctree::

    panel
    grid
    form
    tree