Changing spaces to underscores in a survey

[SteveBrewer]

In my survey I have a Survey ID field that acts as an intelligible globalID so that we can keep track of data using repeats and is built on a set of questions at beginning of the survey. An example is (Drill/Spill/Training)_(Location)_(Initials)_(Date)_(Time) or 

concat( ${d_s}, "_", ${inc_loc}, "_", ${initials}, "_", format-date(${surv_date}, '%Y%m%d'), "_", format-date(${start_time},'%H%M%S'))

Is there a way in the XLS form I can make it so that if the location has a "space" character it is re-written as an underscore? Or is that something we would have to fix in post processing?

[abureaux]

By default, no, you cannot replace characters via XLSForm.

However, this could be completed via JavaScript within your survey. There are some limitations to java, so if that doesn't work for your survey, you will need to do this via post-processing.