How to increment a variable on a for loop in jinja template

Question

I would like to do something like  variable p is from test py which is a list   a   b   c   d      for i in p      variable       variable    result output is  1 2 3 4

User · Accepted Answer

You could use loop index      for i in p         loop index       endfor      Check the template designer documentation   In more recent versions  due to scoping rules  the following would not work      set count   1       for i in p         count         set count   count   1       endfor

User · Answer

As Jeroen says there are scoping issues  if you set  count  outside the loop  you can t modify it inside the loop    You can defeat this behavior by using an object rather than a scalar for  count       set count    1       You can now manipulate count inside a forloop or even an  include   Here s how I increment count  yes  it s kludgy but oh well       if count append count pop     1       endif       increment count by 1

User · Answer

After 2 10  to solve the scope problem  you can do something like this      set count   namespace value 0        for i in p         count value         set count value   count value   1       endfor

User · Answer

if anyone want to add a value inside loop then you can use this its working 100      set ftotal    total   0        - for pe in payment entry -          if ftotal update   total   ftotal total   5        endif       - endfor -      ftotal total     output    5

User · Answer

I was struggle with this behavior too  I wanted to change div class in jinja based on counter  I was surprised that pythonic way did not work  Following code was reseting my counter on each iteration  so I had only red class      if sloupec3            set counter   1           for row in sloupec3                if counter    3                   set counter   1                       endif                 if  counter    1                 lt div class  red  gt  some red div  lt  div gt             endif                 if counter    2                 lt div class  gray  gt  some gray div  lt  div gt             endif                 set counter   counter   1             endfor        endif      I used loop index like this and it works      if sloupec3             for row in sloupec3                  if  loop index   2    1                 lt div class  red  gt  some red div  lt  div gt             endif                 if loop index   2    0                 lt div class  gray  gt  some gray div  lt  div gt             endif              endfor        endif

User · Answer

Came searching for Django s way of doing this and found this post  Maybe someone else need the django solution who come here      for item in item list           forloop counter       starting index 1           forloop counter0       starting index 0            do your stuff       endfor      Read more here  https   docs djangoproject com en 1 11 ref templates builtins

User · Answer

Here s my solution   Put all the counters in a dictionary      set counter          counter1   0       counter2   0       etc   0             Define a macro to increment them easily      macro increment dct  key  inc 1           if dct update  key  dct key    inc         endif       endmacro      Now  whenever you want to increment the  counter1  counter  just do      increment counter   counter1

[python] How to increment a variable on a for loop in jinja template?

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