I'm seeing intermittent issues with the datepicker in MW 1.26. We're getting "jQuery is not defined", so I think it has to do with the resourceloader and maybe the timing of it loading. Sometimes it works, sometimes a few instances load, and sometimes none of them do. There's some more discussion on the talk page here https://www.mediawiki.org/wiki/Topic:Sprswqpt682hyjki
This should now be fixed.
- 96298d67d1f248f8c7ac185dc56266658eeabb6b- Remove direct insertions of JS into the page HTML
- b82ff8e2f95ae4aed7415cc6867dce6529997e33- Remove input type datepicker; follow changed input type registration in SF 3.4.3
- f20110aaa9070ce23f8f16bc218babed54e0084a - Add input type datepicker to SemanticForms
- 36382af25e40980c7420047733a8c16e7e07e365 - Add input type regexp to SemanticForms; fix datepicker
You will need to update both SemanticForms and SemanticFormsInputs to the latest dev version.