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.IX Title "HTML::Widget::Constraint::Callback 3pm"
.TH HTML::Widget::Constraint::Callback 3pm "2023-08-10" "perl v5.36.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
HTML::Widget::Constraint::Callback \- Callback Constraint
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 4
\&    my $c = $widget\->constraint( \*(AqCallback\*(Aq, \*(Aqfoo\*(Aq )\->callback(sub { 
\&        my $value=shift;
\&        return 1;
\&    });
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.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
A callback constraint which will only be run once for each submitted value 
of each named field.
.SH "METHODS"
.IX Header "METHODS"
.SS "callback"
.IX Subsection "callback"
.SS "cb"
.IX Subsection "cb"
Arguments: \e&callback
.PP
Define the callback to be used for validation.
.PP
\&\*(L"cb\*(R" is an alias for \*(L"callback\*(R".
.SS "validate"
.IX Subsection "validate"
perform the actual validation.
.SH "AUTHOR"
.IX Header "AUTHOR"
Sebastian Riedel, \f(CW\*(C`sri@oook.de\*(C'\fR
.PP
Marcus Ramberg, \f(CW\*(C`mramberg@cpan.org\*(C'\fR
.SH "LICENSE"
.IX Header "LICENSE"
This library is free software, you can redistribute it and/or modify it under
the same terms as Perl itself.