Calculation and prefilter accross 3 lists. Help needed

shaq

New Member
As an advanced user of CMS Joomla, I discovered a few months ago fabrik for the development of web application. Novice I try since to develop an online application of management of employees. I created an employer table, an employee table, and a tax table (contribution payable). I made a joined database between the employer list and the employee list. But I block on certain prefilters and on the method of calculating the taxable contribution on the salary of the employees. I have a gross salary element that is a field and a taxable amount element that must be the result of the contribution element to pay (tax list) which is a drop down multiplied by the gross salary item (list employees).
If someone would like to give me a helping hand especially to calculate the taxable contribution to each employee (gross salary x tax). I would also like to have a little help for prefilters including prefilters date (last declared employee, employees declared during the month, etc ...)

Am on Joomla 3.6 et fabrik 3.5.1
 
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