[Zope] How to concatenate variables

[Dieter Maurer]

McDonnell, Larry writes:
 > I am having problems concatenating variables. I have seven pull down menus.
 > Selecting one from each menu will create a part number. I setup a test to
 > see if this would work. I have one dtml doc with the menus. After a submit
 > it calls this dtml doc:
 > 
 > <form name="form1" method="post" action="">
 > <dtml-let pn="' ' ">
 > <dtml-call concat_sub_type_to_part_num(st1,sub_type2)>
 > <dtml-var st1>st1<dtml-var sub_type2>st2
 > <dtml-var expr="pn==st1+sub_type2">
 > <dtml-var pn> pn
 > </dtml-let>
 > </form>
 > 
 > I call a python script concat_sub_type_to_part_num and pass two of the menu
 > selections in this test. I tried to concat there but no luck. I can only see
 > the variables I passed.
Functions are unable to change strings in the callers context.

  You need to return the concatenated value.
  And you must not use "dtml-call" in this case, as it discards the return
  value.


Dieter