Hi, I've searched the list and it seems that no one has been occurred to my problem. Has the javascript interface gone? 'cause I failed the following simplest file: ================================================================ \setupinteraction[state=start] \starttext A few years back, \TEX\ could only produce \fillinfield [dvi] {DVI} output, but nowadays, thanks to \fillinfield {Han The Thanh}, we can also directly produce \fillinfield [pdf] {PDF}! Nice eh? Actually, while the first field module was prototyped in ACROBAT, the current implementation was debugged in \fillinfield [pdfTeX] {\PDFTEX}. Field support in \fillinfield [ConTeXt] {\CONTEXT} is rather advanced and complete and all kind of fields are supported. One can hook in appearances, and validation \fillinfield [JavaScripts] {JAVASCRIPT}'s. Fields can be cloned and copied, where the latter saves some space. By using \fillinfield {objects} when suited, this module saves space anyway. \stoptext ================================================================ It's copied from the mwidget-s.pdf My luatex is 0.30.3, and I just run "luatools --generate" and "ctxtools --update" today. The error message is: ================================================================ ! Undefined control sequence. \:j::j:fields_1 -> var visible_field = new Array() ; var visible_fields = 0... \docommand ...code {\getvalue {\r!java \r!java #1} }\ifoneJSpreamble \@EA \se... \next2 #1,->\docommand {#1} \doprocesscommaitem <argument> \relax fields_1, Do_Check_Answer \doprocesscommalist ...aitem \gobbleoneargument #1 ,]\relax \global \advance ... \presetJSpreamble ...[\allJSpreambles ]\docommand \ifoneJSpreamble \gdef \al... ... l.18 \stoptext ? ================================================================ -- Best Regards Chen ---------------------------------------------------------------- Zhi-chu Chen | Shanghai Synchrotron Radiation Facility No. 2019 | Jialuo Rd. | Jiading | Shanghai | P.R. China tel: 086 21 5955 3405 | zhichu.chen.googlepages.com | www.sinap.ac.cn ----------------------------------------------------------------