= S3GroupedOptionsWidget =
[[TOC]]

== Introduction ==

The S3GroupedOptionsWidget renders a SELECT element as table of radiobuttons/checkboxes:

||'''!MultipleOptionsWidget'''||'''S3GroupedOptionsWidget'''||
||[[Image(groupedopts3.png)]]||[[Image(groupedopts1.png)]]||

The widget can also automatically group options lexicographically (by first letter):

||'''!MultipleOptionsWidget'''||'''S3GroupedOptionsWidget'''||
||[[Image(groupedopts4.png)]]||[[Image(groupedopts2.png)]]||

The main use-case for S3GroupedOptionsWidget is filter forms where the user typically selects multiple options. However, the widget can also be used for single-option SELECTs - in this case the options would be rendered as radio buttons instead of checkboxes so the user can only select one option.
== Python Widget Class ==

The {{{S3GroupedOptionsWidget}}} is implemented in {{{/modules/s3/s3widgets.py}}}.

'''The instance of this class receives the widget options''':

{{{#!python
from s3.s3widgets import S3GroupedOptionsWidget

instance = S3GroupedOptionsWidget(options=None, multiple=True, size=None, cols=None, help_field=None, none=None)

}}}

'''Parameters''':

  ||'''Parameter'''||'''Type'''||'''Explanation'''||'''Default'''||
  ||options||list of tuples [(value, label)], or as dict {value: label}||the options, None to auto-detect the options from the Field during rendering||None||
  ||multiple||boolean||multiple options can be selected||True||
  ||size||integer||the maximum number of option in merged letter-groups||12||
  ||cols||integer||the number of options per row||3||
  ||help_field||string or dict {value: tooltip-string}||field in the referenced table to retrieve a tooltip text for each option (for foreign keys only), or a dict of tooltips, or a callable returning such a dict||None||
  ||none||boolean||Render "None" as regular option||False||

'''To render the HTML for the widget and inject the necessary !JavaScript, call the widget like''':

{{{#!python
widget = instance(field, value, **attributes)
}}}

'''Parameters''':

  ||'''Parameter'''||'''Type'''||'''Explanation'''||'''Default'''||
  ||field||Field||the field to select options for ''(required)''||-||
  ||value|| ||the current value(s) selected ''(required)''||-||
  ||attributes|| ||HTML-attributes for the widget, e.g. "_class" or "_id"||-||

== JQuery UI Widget ==

The {{{S3GroupedOptionsWidget}}} uses the {{{groupedopts()}}} widget in {{{jquery.ui.groupedopts.js}}}. This jQueryUI-widget-factory based widget renders a normal SELECT element as one or multiple groups of checkboxes:



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- [wiki:S3 S3 API Guide]
- DeveloperGuidelines