Input validation in back-end fields

[kongondo]

Welcome to the forums @spackmat,

Just in case you couldn't find it, here's the docs on hooks.

Have a look at these two files as well, under /site/: ready.php and init.php. Normally, you place your hooks in either of these, depending on when you want to intercept an event.

Edited December 4, 2018 by kongondo

[dragan]

Here's a little example how to do client-side start-date / end-date validation: