Jay Kuri > Form-Sensible > Form::Sensible::Field::Number

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NAME ^

Form::Sensible::Field::Number - A Numeric field type.

SYNOPSIS ^

    use Form::Sensible::Field::Number;
    
    my $object = Form::Sensible::Field::Number->new(
                                                        integer_only => 1,
                                                        lower_bound => 10,
                                                        upper_bound => 100,
                                                        step => 5,
                                                    );

    $object->do_stuff();

DESCRIPTION ^

The number field type is one of the more advanced field types in Form::Sensible. It has a number of features for dealing specifically with numbers. It can be set to have a lower and upper bound, allowing validation to ensure that the value selected is within a range. It can also be set to have a 'step', which provides a constraint to what values are valid between the upper and lower bounds. It can also be made to accept integers only, or fractional values.

Finally, it can be rendered in a number of ways including select boxes, drop downs or even ranged-sliders if your renderer supports it.

ATTRIBUTES ^

integer_only

True/false value indicating whether this field is able to accept fractional values. Required attribute.

lower_bound

Lower bound of valid values for the field.

upper_bound

Upper bound of valid values for the field.

step

When step is provided, the value provided must be a multiple of step in order to be valid.

METHODS ^

validate

Validates the field against the numeric constraints set for the field.

get_potential_values($step, $lower_bound, $upper_bound)

Returns an array containing all the valid values between the upper and lower bound. Used internally to the number field.

in_step($value, $step)

Returns true if $value lies on a $step boundary. Otherwise returns false.

get_additional_configuration

Returns a hashref consisting of the attributes for this field and their values.

The following two methods allow Number fields to be treated like Select Fields for rendering purposes.

get_options

An array ref containing the allowed options. Each option is represented as a hash containing a name element and a value element for the given option.

accepts_multiple

On a Select field, this defines whether the field can have multiple values. For a Number field, only one value is allowed, so this always returns false.

VALIDATION OPTIONS ^

regex

The number field type by default checks that what was passed looks like a number based on the following regex:

    qr/^[-+]?                   # Sign
        (?: [0-9]+              # Integer portion ...
            (?: \. [0-9]* )?    # Fractional portion
        |   \. [0-9]+           # Just a decimal
        )
      $/xms

This will handle most numbers you are likely to encounter. However, if this regex is insufficient, such as when you need to process numbers in exponential notation, you can provide a replacement regex in the field's 'validation' hash:

    my $object = Form::Sensible::Field::Number->new(
                                                    validation => {
                                                        # allow exponential notation
                                                        regex => qr/^[-+]?[0-9]*\.?[0-9]+([eE][-+]?[0-9]+)?$/,
                                                    }
                                                );

Note that the Number validation routines outlined above are not built to handle numbers perl can not handle natively. That is to say, if you are working with numbers that perl can not parse, or that require you to use modules such as Math::BigInt, you can still use the Number class, but it's best to avoid Number's builtin validation. You can perform your validation yourself in a code validation block or by subclassing Form::Sensible's Number or Text field classes.

AUTHOR ^

Jay Kuri - <jayk@cpan.org>

SPONSORED BY ^

Ionzero LLC. http://ionzero.com/

SEE ALSO ^

Form::Sensible

LICENSE ^

Copyright 2009 by Jay Kuri <jayk@cpan.org>

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

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