What I assumed would be fairly straightforward has vexed me for several days now -
I'm trying to pass the Expression Preview string along with some additional custom security vars when the filter is loaded and obviously when re-applied.
I've tried filter.getOptions, sender._previewContainer, I even tried $( '.k-filter-preview' ).text() but I am running into issues of inconsistency regarding timing of availability.
My JS/jQuery is mediocre as its really only been my secondary, or even tertiary, approach of choice, until very recently so feel free to add ...dummy to an suggested resource. :)