HTML::FormFu::Element::Repeatable(3)

NAME
HTML::FormFu::Element::Repeatable - repeatable block element

VERSION
version 2.07

SYNOPSIS
    ---
    elements:
      - type: Repeatable
        name: my_rep
        elements:
          - name: foo
          - name: bar

Calling "$element->repeat(2)" would result in the following markup:

    <div>
        <input name="my_rep.foo_1" type="text" />
        <input name="my_rep.bar_1" type="text" />
    </div>
    <div>
        <input name="my_rep.foo_2" type="text" />
        <input name="my_rep.bar_2" type="text" />
    </div>

Example of constraints:

    ----
    elements:
      - type: Repeatable
        name: my_rep
        elements:
          - name: id

          - name: foo
            constraints:
              - type: Required
                when:
                  field: 'my_rep.id' # use full nested-name

          - name: bar
            constraints:
              - type: Equal
                others: 'my_rep.foo' # use full nested-name

DESCRIPTION
Provides a way to extend a form at run-time, by copying and repeating its child elements.

The elements intended for copying must be added before "repeat" is called.

Although the Repeatable element inherits from Block, it doesn't generate a block tag around all the repeated elements - instead it places each repeat of the elements in a new Block element, which inherits the Repeatable's display settings, such as "attributes" and "tag".

For all constraints attached to fields within a Repeatable block which use either others or when containing names of fields within the same Repeatable block, when repeat is called, those names will automatically be updated to the new nested-name for each field (taking into account increment_field_names).

METHODS

  repeat
Arguments: [$count]

Return Value: $arrayref_of_new_child_blocks

This method creates $count number of copies of the child elements. If no argument $count is provided, it defaults to 1.

Note that "$form->process" will call "repeat" automatically to ensure the initial child elements are correctly set up - unless you call "repeat" manually first, in which case the child elements you created will be left untouched (otherwise process would overwrite your changes).

Any subsequent call to "repeat" will delete the previously copied elements before creating new copies - this means you cannot make repeated calls to "repeat" within a loop to create more copies.

Each copy of the elements returned are contained in a new Block element. For example, calling "$element->repeat(2)" on a Repeatable element containing 2 Text fields would return 2 Block elements, each containing a copy of the 2 Text fields.

  counter_name
Arguments: $name

If true, the "query" in HTML::FormFu will be searched during "process" in HTML::FormFu for a parameter with the given name. The value for that parameter will be passed to "repeat", to automatically create the new copies.

If "increment_field_names" is true (the default), this is essential: if the elements corresponding to the new fieldnames (foo_1, bar_2, etc.) are not present on the form during "process" in HTML::FormFu, no Processors (Constraints, etc.) will be run on the fields, and their values will not be returned by "params" in HTML::FormFu or "param" in HTML::FormFu.

  increment_field_names
Arguments: $bool

Default Value: 1

If true, then all fields will have "_n" appended to their name, where "n" is the "repeatable_count" value.

  repeatable_count
This is set on each new Block element returned by "repeat", starting at number 1.

Because this is an 'inherited accessor' available on all elements, it can be used to determine whether any element is a child of a Repeatable element.

Only available after repeat has been called.

  repeatable_count_no_inherit
A non-inheriting variant of "repeatable_count".

  nested_name
If the "nested_name" attribute is set, the naming scheme of the Repeatable element's children is switched to add the counter to the repeatable blocks themselves.

    ---
    elements:
      - type: Repeatable
        nested_name: my_rep
        elements:
          - name: foo
          - name: bar

Calling "$element->repeat(2)" would result in the following markup:

    <div>
        <input name="my_rep_1.foo" type="text" />
        <input name="my_rep_1.bar" type="text" />
    </div>
    <div>
        <input name="my_rep_2.foo" type="text" />
        <input name="my_rep_2.bar" type="text" />
    </div>

Because this is an 'inherited accessor' available on all elements, it can be used to determine whether any element is a child of a Repeatable element.

  attributes

  attrs
Any attributes set will be passed to every repeated Block of elements.

    ---
    elements:
      - type: Repeatable
        name: my_rep
        attributes:
          class: rep
        elements:
          - name: foo

Calling "$element->repeat(2)" would result in the following markup:

    <div class="rep">
        <input name="my_rep.foo_1" type="text" />
    </div>
    <div class="rep">
        <input name="my_rep.foo_2" type="text" />
    </div>

See "attributes" in HTML::FormFu for details.

  tag
The "tag" value will be passed to every repeated Block of elements.

    ---
    elements:
      - type: Repeatable
        name: my_rep
        tag: span
        elements:
          - name: foo

Calling "$element->repeat(2)" would result in the following markup:

    <span>
        <input name="my_rep.foo_1" type="text" />
    </span>
    <span>
        <input name="my_rep.foo_2" type="text" />
    </span>

See "tag" in HTML::FormFu::Element::Block for details.

  auto_id
As well as the usual substitutions, any instances of %r will be replaced with the value of "repeatable_count".

See "auto_id" in HTML::FormFu::Element::Block for further details.

    ---
    elements:
      - type: Repeatable
        name: my_rep
        auto_id: "%n_%r"
        elements:
          - name: foo

Calling "$element->repeat(2)" would result in the following markup:

    <div>
        <input name="my_rep.foo_1" id="foo_1" type="text" />
    </div>
    <div>
        <input name="my_rep.foo_2" id="foo_2" type="text" />
    </div>

  content
Not supported for Repeatable elements - will throw a fatal error if called as a setter.

CAVEATS

  Unsupported Constraints
Note that constraints with an others method do not work correctly within a Repeatable block. Currently, these are: AllOrNone, DependOn, Equal, MinMaxFields, reCAPTCHA. Also, the CallbackOnce constraint won't work within a Repeatable block, as it wouldn't make much sense.

  Work-arounds
See HTML::FormFu::Filter::ForceListValue to address a problem with increment_field_names disabled, and increading the repeat on the server-side.

SEE ALSO
Is a sub-class of, and inherits methods from HTML::FormFu::Element::Block, HTML::FormFu::Element

HTML::FormFu

AUTHOR
Carl Franks, "cfranks@cpan.org"

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

AUTHOR
Carl Franks <cpan@fireartist.com>

COPYRIGHT AND LICENSE
This software is copyright (c) 2018 by Carl Franks.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.