Check boxes allow the user to toggle things on and off in a form. They can be used singularly (as a sort of alternative to two radio buttons), or they can be used in groups where the user can select any number of options.
For example you could have the following CheckBox:
- <forms:checkbox id="switch" valuechecked="on" valueunchecked="off" />
which will submit either "on"
to the server.
Or you could have valuechecked="blue" valueunchecked="red"
, which implies that the default
value for this particular parameter is "red"
, rather than no value at all.
Where CheckBoxes shine is where you need the user to specify zero, one, or many values for a single item in a form:
- <forms:checkbox name="colours" valuechecked="red" />
- <forms:checkbox name="colours" valuechecked="green" />
- <forms:checkbox name="colours" valuechecked="blue" />
Here the user can select the colours they like, which will be posted to the server to the field colours
. Note valueunchecked
is not relevent in this case; if no values are selected then the value for colours
Whether or not the checkbox is checked
Sets the data column
The datacolumn links the form item to a key used when getting or saving from a component (as defined by the parent form).
Disables the input, preventing user interaction
Focus On Load
If true, this control will attempt to focus itself after the page has loaded. Note that only one element may be focused on the page at a time.
Default = false
Sets the height of the element. The default units are pixels. include the percentage symbol % to user percentage values.
(Required) Most form items need a unique id so that they can submit data to the server. No two form items may have the same id. For situations where multiple form items submit to the same field, see the name attribute. Id's that begin with contact_ will automatically save Contact information to the Contact database as long as the user has entered enough identifying information (ideally Name and Email). Check the Contact Fields page for correct field names.
Sets the name of the form item. Most of the time, the id attribute will suffice. However with form items that post multiple values into an array, each item will need to have the same name, followed by . For example three controls with name="data", will all post into 'data'.
Radio buttons belonging to the same group will have to share the same name.
Set to true if you need a simple <input type="checkbox"> without any container elements
Restore state on reload
Whether the value of the input is persists when the page is revisited.
Default = false
Sets the value transformations to be applied to the value of the form item as a comma separated string.
Sets the validations to be applied to the value of the form item as a comma separated string.
What is posted to the server when this checkbox is checked.
Defaults to "1", which is fine if you have a single checkbox for enabling/disabling a boolean option.
If you have multiple checkboxes for the same name, then each must have a different valuechecked.
The value the server sees when this checkbox is not checked.
Relevent only when there is a single checkbox for a given name.
Sets the width of the element. The default units are pixels. include the percentage symbol % to user percentage values.