is_defined

Tests if a value is defined.

Checks if the value is not empty and outputs a boolean true or false. This is useful in combination with the tag#if tag.

For example:

{% if value|is_defined %}The value was defined{% endif %}

When the value is “foo” then the output “The value was defined”.

Test whether a survey respondent may return to the previous page in a history.

Check if the given survey is configured to save intermediate results. Always returns a boolean value.

Provide an alternative value in case a value is undefined.

Provide an alternative value in case a value is undefined.

Check if a list of questions contains a pagebreak block with an unconditional submit.

Selects an argument depending on a condition.

Tests if the value is a date and equal to the argument. The value and the argument must be a tuple of the format {Y,M,D} or {{Y,M,D},{H,I

Test if a value is a list:

Determine if any answer of a question was correct. Used for showing results of thurstone test questions.

Type at least two characters