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Description
FormConditional is a variant of Conditional
designed to be used in a Form, similar to
the relationship between Foreach and
ListEdit. It is used to guarantee that
the data will be the same during rendering and rewind when a form
is submitted avoiding a stale link.
On render, FormConditional reads condition parameter, stores it
into a hidden field, and could render or not according to condition
value. On rewind, the FormConditional ignores condition parameter,
reads the stored value, and could render or not matching previous
render.
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