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The Comma-separated Checkboxes widget allows the user to render the records from a database table as checkboxes. Each entry in the database table passes its label to the checkbox's label, and the ID (or a value of choice) to the checkbox value. When the form is submitted, all of the checked records (shown as checkboxes) will be passed as a single string, containing the checkbox's values separated by commas.
An use of this widget is when having to subscribe to several magazines in a registration form, and the database only uses one field to store the subscriptions for each user, using the comma separated magazine's ID.
When viewed in a browser, the widget is rendered as a set of checkboxes,
but they will submit a single string made up from comma separated values.
Please see the following image to better understand the behavior:
