Calculate value from 2 other values

[gcopping]

I have a form with 2 values entered by the user - say field1 and field2. I want to add another field3 which is calculated as field1 minus field2. What is the best way to do this? I have tried adding Javascript code but cannot get it to work.

I have also seen something in the Help about "Create a XX.js file in components/com_fabrik/js, where XX is your numeric form ID, and put your functions in there, then just call the functions from your element JS actions." However I cannot find any component called "com_fabrik/js" - where do I find this?

Any help is much appreciated.

 

[troester]

Have a look at the calculation plugin
http://fabrikar.com/forums/index.php?wiki/calculation-element/

 

[gcopping]

Thanks this looks like a good possibility. I have found the plugin and installed it, but I have absolutely no idea how to code the PHP to do this and I don't find the Help associated with this plugin very helpful in this respect. Is there any other Help anywhere that would point me in the right direction?

 

[troester]

I've added a "Simple example" to the calc WIKI
http://fabrikar.com/forums/index.php?wiki/calculation-element/#simple-examples

 

[gcopping]

Thanks again I have now got it working. Your help is much appreciated.