Saavedrah's Blog

jQuery DataTables Plug-in

saavedrah — Sat, 13 Aug 2011 14:39:30 +0000

I just want to post an example of how to configure the DataTables jQuery plug-in. Let’s say that I have a tree and that every time a node in the tree is clicked a new request is sent to the server and the data in the DataTables plug-in should be updated.

The HTML will look like this



...

...

  
  

...

Now let's say that I have a JSON response from the server that looks like this:


body : {
  obj [ {
    col1 : "valCol1",
    col2 : "valCol2"
  } ]
}

Now I need a JavaScript function that is going to create/update the data in the table every time that the response is obtained from the server.


loadDataTable = function(data) {
	var view = $('#class-table');
	var modelList = data.body.obj;

	if ($('#columnHeader').length) {
		var data = [];
		for ( var i = 0; i < modelList.length; i++) {
			data[i] = [
					'',
					modelList[i].valCol1, modelList[i].valCol2 ];
		}

		view.dataTable().fnClearTable();
		view.dataTable().fnAddData(data);
	} else {
		var html = '';

		html += '';
		html += '';
		html += '';
		html += 'Column 1';
		html += 'Column 2';
		html += '';
		html += '';

		html += '';

		for ( var i = 0, count = modelList.length; i < count; i++) {
			html += '';

			html += '';
			html += '' + modelList[i].valCol1 + '';
			html += '' + modelList[i].valCol2 + '';
			html += '';
		}
		html += '';

		view.append(html);

		var oTable = view.dataTable({
			"sScrollY" : "200px",
			"bPaginate" : false,
			"bDestroy" : true
		});

		/* Adjust the size of the Table */
		$(window).bind('resize', function() {
			oTable.fnAdjustColumnSizing();
		});
	}
};

References:

DataTables jQuery plug-in

Ubuntu 11.04 Remote Desktop Keyboard

saavedrah — Wed, 29 Jun 2011 14:24:33 +0000

Problem
When using Remote Desktop to access the Ubuntu server if the ‘D’ key is pressed then all the windows are minimized.

Solution
Go to System->Preferences->Keyboard Shortcuts and change the shortcut for ‘Hide all normal windows and set focus to the desktop’

References

Ubuntu Forum

phpAlbum v/s spgm

saavedrah — Thu, 09 Jun 2011 16:24:18 +0000

I have been looking for a program that could display my personal pictures on the web using my personal server.
I found this two options: phpAlbum and spgm (Simple Picture Gallery Manager), I will try to resume the pro and cons of both options.
Both of them do not use any kind of database so it is easy to handle the folders as I please. Also, both are written in php so the modifications are kind of easy to do.

1 – phpAlbum
- Last version is 0.4.1-14_fix06 generated on July/2009
- Patrik still working on it and the code is on code.google at phpAlbum-net
- It does not work very well with lots of pictures. It takes long time creating the cache.
- Has a nice administration page to change the settings of the application.

2 – Simple Picture Gallery Manager
- Release 1.4.7 was done in January of 2007
- Source code is on SourceForge .
- It is very easy to modify and to understand the php logic.
- It is really fast loading the pictures.
- Has a module to integrate video
- It requires to create thumbnails for each picture. XnView help with this task.
- No too many flavors around. spgm home page gives a database error.
- Under the new version of php the deprecated ‘eregi’ has to be changed for preg_match.
For instance:
if ( eregi($spgm_cfg['global']['supportedExtensions'][$i].'$', $strPictureFileName) ) {
should be changed for
if ( preg_match('@'.$spgm_cfg['global']['supportedExtensions'][$i].'$@i', $strPictureFileName) ) {

Ok, that’s it for tonight.

Jasper Report Server – Investigation

saavedrah — Thu, 19 May 2011 15:22:48 +0000

El objectivo de este blog es describir como funciona Jasper Report Server.

Creación de los formatos para los reportes

En este caso se utilizará iReport ( otro software para generar formatos es Jasper Assistant ) para generar los formatos en XML, por convención los formatos para los reportes tienen la extensión .jrxml

Algo especial del .jrxml file es que contine el tag el cual define el SQL que se debe ejecutar para obtener la información que se va a incluir en el reporte.

Los valores que el SQL retorna son definidos por el tag
El tag define los encabezados o titulos del reporte.
El tag define la apariencia de los valores que aparecen en el reporte
Los valores que se imprimen en el reporte se definen de le siguiente manera $F{PARAMETRO}

Creación del Reporte (Java)
En java se crea una clase para abrir la conección con la base de datos.
Se crea un objeto que contiene el reporte compilado JasperReport y un objecto que contiene el reporte generado JasperPrint.
Las clases JasperCompileManager, JasperFillManager and JasperExportManager compilan el reporte, llenan el reporte con la información y generan el reporte en el formato requerido.

Referencias

http://java.dzone.com/articles/java-reporting-part-2 : Describe como generar un reporte utilizando java.
http://code.google.com/p/jasperapiclient/source/browse/#svn%2Ftrunk : Es el repositorio para las clases en php que generan los reportes
http://jasperforge.org/espdocs/docsbrowse.php?id=74&type=docs&group_id=112&fid=305 : Es un documento en PDF con la información necesaria para utilizar Jasper Report Server.

Ubuntu Access Forbidden

saavedrah — Sat, 23 Apr 2011 14:40:36 +0000

Problem:

Accessing a web page using Ubuntu and Apache the error 404 Forbidden is generated.
When checking the error log, usually at /var/log/apache2/error.log, the error “(13)Permission denied: access to /XYZ/ denied” is displayed

Solution:
Make sure that the files and the directory have the right permissions:
Permissions for the directory: sudo chmod 755 /var/www/xyz/other
And permissions for the files: sudo chmod 755 /var/www/xyz/other/*

Note:
If the files to be accessed are in a FAT drive then the drive has to be mounted with the correct permissions.
The /etc/fstab file has to be edited to mount the drive correctly
/dev/sdd1 /mnt/hd3 vfat auto,user,sync,exec,uid=1000,gid=1000,dmask=002,fmask=113 0 0

Where
/dev/sdd1/ is the FAT drive to be mounted
/mnt/hd3 is the place to mount the drive
dmask are the permissions for the directories in octal
fmask are the permissions for the files in octal

References

Mounting Fat32

fstab

USA Visa

saavedrah — Sun, 27 Feb 2011 07:03:32 +0000

Tenía que renovar mi visa a los Estados Unidos y esta vez la renovación se realizó en Tokio. Estos son algunos pasos para la próxima oportunidad.

Como la visa anterior fué generada antes del 2007 es necesaria la entrevista con el consul. Entonces hay que ir a esta página y seguir los pasos para pedir la entrevista.
Lo primero es completar el formulario DS-160. Para llenar este formulario hay que tener una foto digitalizada, tomó cierto tiempo subiendo la fotografía, pero finalmente se logró reduciendo el tamaño de la imagen (60Kb). Cuando el formulario esta completo hay que imprimir solo la página de confirmación. Sin embargo es recomendable imprimir cada una de las formas que se van completando para tener una historia. La opción de imprimir el formulario al final no funciona.
Después de llenar el formulario hay que hacer la cita para la entrevista. Teniendo la cita para la entrevista se genera la información para hacer el pago.
En mi caso el pago se hizo en el banco Mizuho en Shizuoka, una persona en el banco me ayudó a hacer la consignación porque no hay ni Español ni Inglés disponible. Esta página es un ejemplo de ATM, está en Japones.
Lo siguiente es reunir los papeles necesarios para la día de la entrevista, hay que tomarse una foto 5cmx5cm, los pasaportes de mis familiares, fotocopia del libro del banco, confirmación del salario recivido, permiso de entrada al Japón, fotocopia de la terjeta de identificación japonesa.
Listos para la entrevista, la cita era a las 9AM pero yo llegé a las 8AM y ya estaban dejando pasar la gente. Reciben los papeles en el primer cubículo, toman las huellas dactilares en otros tres cubículos y hacen la entrevista, a las 11AM ya estaba la visa aprovada y listo para regresar a casa.

Ubuntu & Apache

saavedrah — Wed, 01 Dec 2010 16:07:20 +0000

I just installed Ubuntu in my machine and the following page does a great job showing how to install Apache/php/MySql:

Install Apache

Some of the instructions are copied

Install apache :

sudo apt-get install apache2 apache2.2-common apache2-mpm-prefork apache2-utils ssl-cert

Install php:

sudo apt-get install php5 libapache2-mod-php5

Restart apache:

sudo /etc/init.d/apache2 restart

Install MySql

sudo apt-get install mysql-client mysql-server

VMWare Player Language change

saavedrah — Tue, 02 Nov 2010 00:30:23 +0000

Recently I installed VMWare Player in a machine that is running a Japanese Windows XP OS. I expected that I was going to be able to change the language to English from the tool bar, but it is not an option available.
After checking the RegEdit I found that the application was looking for the folder “.\Program Files\VMware Player\messages\ja” so I renamed the folder to “VMware Player\messages_” and restart the VMPlayer.
Now the application is running in English, よかった。

Win2008 Server – Local Security Policy disabled

saavedrah — Sat, 03 Jul 2010 14:26:28 +0000

Issue:

In Windows Server 2008 the password complexity requirements are set on by default. I wanted to change my user password to something simpler since it is in my development environment.

Troubleshoot:

The first idea was to go to Administrative Tools > Local Security Policy > Account Policy > Password Policies and change the value for “Password must meet complete requirements” from Enabled to Disabled. However, it was not possible to change it since it was disabled.

Solution:

Open Group Policy Management (gpmc.msc), select Group Policy Objects > Default Domain Policy, select the Default tab and change the GPO Status to “User configuration settings disabled”. After doing this I was able to edit the Password Policies and disable the complete requirements for the password, also changed the “Minimum Password Age” and the “Maximum Password Age” to zero.

Windows 7 Network

saavedrah — Tue, 22 Jun 2010 15:35:52 +0000

Issue:

The main server in my home network is running a XP SP3, this server is in a domain. A new computer running Windows 7 was added to the network using workgroup but it was not added to the domain. When trying to access the XP server from the Win 7 machine an error is displayed saying that the access to the server is denied. No login window was displayed whenever the XP server is selected.

Troubleshoot:

The Win 7 Security Policy ( secpol.msc) was modified Local Policy -> Security Options -> Network Security – LAN Manager was changed to Send LM and LTLM ( Negotiate LTLMv2 ) however the behavior did not change.

In the Sharing Network Center the Recognize Network was enabled, File and Printer Sharing was enabled, in the Home group the User account and Password was enabled. However the access denied still showing up.

Solution:

The XP Server was removed from the domain and added to the Workgroup the same as the Win 7 machine. When selecting the XP machine the Login Window was showed and it was possible to add the shared printer.