cvalue

The cvalue (calculated value) tag is used on a question or variable to calculate and set a value. The value is set when the parent page is submitted. The tag input can contain any logical statement or Perl expression, and it uses the same formatting and syntax rules as standard Perl scripts. Usually, cvalue is used to set a value to hidden variables.

Syntax

Put the cvalue tag inside a question widget to set a value to that widget.

# In a question widget
cvalue: Value, expression, or logical statement.

Tags

The following tags can be included when using the cvalue tag.

Examples

Assign value to background variable

See demo See code Restart demo

Count of brands selected

See demo See code Restart demo

Converting response to all caps

See demo See code Restart demo

Aggregation variables with list functions

ALLSTEPS. VAR | Brands selected at any level of STEP1-STEP10
type: checkbox
systemvar: y
translate: n
invisible: y
optsfrom: BRANDS
cvalue: listWhich(BRANDS,STEPNUMBER; anyChecked($QSTEP[STEPNUMBER:id],[BRANDS:id]); [BRANDS:id])

Calculating link-parameter-based variables

PANEL. Panel Identifier
cvalue: $panel || 0
chapter: S
translate: n
invisible: y
type: radio
csentrycalc: y
optsfrom: panel_list

SAMP. Sample type
type: radio
translate:  n
invisible: y
cvalue: url_param('smp')
chapter: S
10. Rep. sample
# 11. Rep 2 sample
20. Augment
# 21. Augment #2
30. Over sample
# 31. Over sample #2
# 40. Teen Sample
# Has downstream logic - Do not use SAMP=40 for anything other than Teen Sample

"Return X" with logical references

The following can be used as an alternative to selectby, though if not returning a value, selectby is often a safer option.

X_MIN.
type: hidden
translate: n
cvalue: <<END
return 1  if (anyChecked($QX,1));
return 2  if (anyChecked($QX,2));
return 3  if (anyChecked($QX,3));
return 5  if (anyChecked($QX,4));
return 8  if (anyChecked($QX,5));
return 11 if (anyChecked($QX,6));
return 16 if (anyChecked($QX,7));
return 20 if (anyChecked($QX,8));
END