JOEL LIPMAN Systems / Automation / AI

Knowledge base / Since 1999

Scripts, systems & field notes.

Practical solutions and technical notes from CRM platforms, workflow automation, APIs, databases and the systems around them.

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Warning call_user_func: First argument is expected to be a valid callback
Joomla

Warning call_user_func: First argument is expected to be a valid callback

If you get something like the following error: Warning: call_user_func() [function.call-user-func]: First argument is expected to be a valid callback in /home/.../templates/rt_affinity/rt_sectionrows.php on line 311 How? Copy & backup the file /public_html/.../templates/rt_affinity/rt_sectionrows.php Find the following...

Read note 40,842 hits
Search a database for a string (MySQL, T-SQL)
Databases

Search a database for a string (MySQL, T-SQL)

I have a PHP script which behaves like PhpMyAdmin, in that it automatically lists a database structure and the fields to modify similar to an excel spreadsheet. Now without using PHP, I need standalone SQL scripts that can simply be used to search an entire database for a particular string of word(s). I've posted my ow...

Read note 60,273 hits
Joomla article modal with clear button
Joomla

Joomla article modal with clear button

This is an article to describe how to add an article modal button in the Joomla Admin Panel (at time of print version 2.5.6) of your component including the all important clear button. What I found was that no one posted this solution which I found is compatible with almost any site and with all my components without h...

Read note 50,013 hits
Basic Joomla 2.5 Mootools Form
Joomla

Basic Joomla 2.5 Mootools Form

This is an article to demo the crudest form which uses Joomla's version 2.5 core mootools (uncompressed?). This is intended for absolute novices (like me) who just want to see an example of an AJAX form within Joomla 1.6.x - 2.5.x in it's most basic state. At time of print, I am using this with Joomla 2.5.6.

Read note 66,263 hits
Connect to Joomla database in standalone script
Joomla

Connect to Joomla database in standalone script

APPLIES TO Joomla 2.5.x Why? I'm building a Joomla component which is to be compatible with Joomla versions 1.6.x to 2.5.x. Because I use dynamic scripts running in the background (mootools), some of these need to connect to the database but as they sit outside of the MVC structure, we need them to use the existing con...

Read note 61,400 hits
Joomla field types clear my html
Joomla

Joomla field types clear my html

Trying to make a component and can't remember how to store HTML code when the save command is clicked (ie. submitted from a PHP form). This is for the Opensource Content Management System (CMS - phew what a mouthful) Joomla! version 1.6.x to 2.5.x; no wonder customers have difficulty following. How? So it's the field o...

Read note 20,828 hits
MySQL: Display Users and Duration in Matrix Timesheet
MySQL

MySQL: Display Users and Duration in Matrix Timesheet

Given Data Activities by employees with start dates and end dates in a mySQL database. Objective User Mon Tue Wed Thu Fri Sat Sun Total --------------- ------- ------- ------- ------- ------- ------- ------- --------- Me 09:00 07:30 08:00 07:00 06:00 00:00 02:00 36:00 Myself 07:30 07:30 07:30 07:30 07:00 00:00 00:00 37...

Read note 37,573 hits

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