Zwartberg News

Zwartberg Research & Development News

Monday March 29th, 2010

A new community-service free bulletin board for information about GREEN alternatives has been created using the Karoo Project: http://green.zwartberg.com/

Monday February 1st, 2010

The Karoo Project has gained a widget set, to make it even easier to create web applications.

Following are some live examples:

metamorphic

sedimentary

conglomerate

volcanic

cave

conduit

sql

Hello

Numeric: Hello	This is a multi-line text input box
	list element 1 list element 2 list element 3 list element 4 list element 5 list element 6 list element 7 list element 8 list element 9 list element 10 list element 11 list element 12 list element 13 list element 14 list element 15 list element 16 list element 17 list element 18 list element 19 list element 20 Check

ID	Section 1				Section 2
number	A	B	C	D	A	B	C	D

123 Another value
Yet another read-only value

The "source code" for these widgets is very simple, e.g. to create the pulldown currency list in the above example:

<div id="currency_list">
  <div style="visibility: hidden;">
    <div><img src="images/ZAR.png" style="width:100px;height:35px;border:0px;" alt="ZAR"/></div>
    <div><img src="images/USD.png" style="width:100px;height:35px;border:0px;" alt="USD"/></div>
    <div><img src="images/EUR.png" style="width:100px;height:35px;border:0px;" alt="EUR"/></div>
    <div><img src="images/GBP.png" style="width:100px;height:35px;border:0px;" alt="GBP"/></div>
  </div>
  <!-- widget list selected:0; action:listAction;-->
</div>
<!-- widget menuitem action:menuAction; -->

This widget set is also open source (LGPL) and you are free to use it. Please read more here.

Install Surf

Thursday November 12th 2009

A new version of the "surf" application allows you to create a dynamic website via "conduit", without writing a single line of code. Just an XML configuation file, and the XHTML page.

Surf is a rock which is also a web server.

Conduit is a mechanism for creating dynamic web content directly from a database. This works in conjunction with "cave", which provides access to the PostgreSQL relational database.

Cave provides access to database services, which are defined in an XML configuration file. The Surf conduit can reference these services and create dynamic web content. E.g. Following is a simple database service definition for cave:

<database name="KarooDB" username="bmodra" password=""
 connect_timeout="1" connection-pool-size="3"/>
<service name="list-stock" id="list-stock">
  <sql>
    select owner,type,value,count,id from
    stock where owner=<parameter name=
    "owner" type="quoted-string"/>;
  </sql>
</service>

Following is the corresponding html:

<table>
  <tbody>
    <tr>
      <th>owner</th>
      <th>type</th>
      <th>value</th>
      <th>count</th>
      <th>id</th>
    </tr>
    <tr id="test">
      <!-- conduit rock-name:cave; service-id:list-stock; -->
      <td><!-- column owner --></td>
      <td><!-- column type --></td>
      <td><!-- column value --></td>
      <td><!-- column count --></td>
      <td><!-- column id --></td>
    </tr>
  </tbody>
</table>

... which when served by surf, will produce something like this:

owner	type	value	count	id
bmodra	pc	599900	1	1
bmodra	keyboard	10000	2	3
bmodra	desk	70300	1	6
bmodra	screen	120000	1	2

This is a very simplistic example, but the creation of rich html is no more complex than it is to create a rich website, and the dynamic content can be added by the correct placement of the conduit comments, as in the example above.

This system allows the service behind the scene to be a super computer.... and its just as simple as shown in this example, with not one line of code being written. Its all xml and xhtml.

More...

The Karoo Project Installing the Surf web browser

Documents
Downloads
Sourceforge