# <netui:checkBoxOption> Tag

The <netui:checkBoxOption> tag renders a single HTML checkbox within a group of checkboxes.

## Syntax

<netui:checkBoxOption
[accessKey="string_accessKey"]
[alt="string_alt"]
[labelStyle="string_label"]
[labelStyleClass="string_class"]
[onBlur="string_onBlur"]
[onChange="string_onChange"]
[onClick="string_onClick"]
[onDblClick="string_onDblClick"]
[onFocus="string_onFocus"]
[onKeyDown="string_onKeyDown"]
[onKeyPress="string_onKeyPress"]
[onKeyUp="string_onKeyUp"]
[onMouseDown="string_onMouseDown"]
[onMouseMove="string_onMouseMove"]
[onMouseOut="string_onMouseOut"]
[onMouseOver="string_onMouseOver"]
[onMouseUp="string_onMouseUp"]
[onSelect="string_onSelect"]
[style="string_Style"]
[styleClass="string_Class"]
[tabindex="string_tabIndex"]
[tagId="string_tagId"]
[value="string_literal_or_expression_value"] />

## Description

The <netui:checkBoxOption> tag renders a single HTML checkbox within a group of checkboxes. The <netui:checkBoxOption> tags must have a parent <netui:checkBoxGroup> tag (which determines the data binding for the <netui:checkBoxOption> tags).

## Attributes

accessKey | The keyboard navigation key for the element. The following values are not recommended because they are often used by browsers: `A, C, E, F, G, H, V, left arrow, and right arrow`
Required | Supports runtime expression evaluation | Data bindable
No | No | No
alt | The alt attribute of the element.
Required | Supports runtime expression evaluation | Data bindable
No | No | Read Only
labelStyle | The style of the text displayed by the rendered checkbox.
Required | Supports runtime expression evaluation | Data bindable
No | No | No
labelStyleClass | The class of the text displayed by the rendered checkbox.
Required | Supports runtime expression evaluation | Data bindable
No | No | No
onBlur | The onBlur JavaScript event.
Required | Supports runtime expression evaluation | Data bindable
No | Yes | No
onChange | The onChange JavaScript event.
Required | Supports runtime expression evaluation | Data bindable
No | Yes | No
onClick | The onClick JavaScript event.
Required | Supports runtime expression evaluation | Data bindable
No | Yes | No
onDblClick | The onDblClick JavaScript event.
Required | Supports runtime expression evaluation | Data bindable
No | Yes | No
onFocus | The onFocus JavaScript event.
Required | Supports runtime expression evaluation | Data bindable
No | Yes | No
onKeyDown | The onKeyDown JavaScript event.
Required | Supports runtime expression evaluation | Data bindable
No | Yes | No
onKeyPress | The onKeyPress JavaScript event.
Required | Supports runtime expression evaluation | Data bindable
No | Yes | No
onKeyUp | The onKeyUp JavaScript event.
Required | Supports runtime expression evaluation | Data bindable
No | Yes | No
onMouseDown | The onMouseDown JavaScript event.
Required | Supports runtime expression evaluation | Data bindable
No | Yes | No
onMouseMove | The onMouseMove JavaScript event.
Required | Supports runtime expression evaluation | Data bindable
No | Yes | No
onMouseOut | The onMouseOut JavaScript event.
Required | Supports runtime expression evaluation | Data bindable
No | Yes | No
onMouseOver | The onMouseOver JavaScript event.
Required | Supports runtime expression evaluation | Data bindable
No | Yes | No
onMouseUp | The onMouseUp JavaScript event.
Required | Supports runtime expression evaluation | Data bindable
No | Yes | No
onSelect | The onSelect JavaScript event.
Required | Supports runtime expression evaluation | Data bindable
No | Yes | No
style | The style of the rendered HTML tag.
Required | Supports runtime expression evaluation | Data bindable
No | No | No
styleClass | The class of the rendered HTML tag.
Required | Supports runtime expression evaluation | Data bindable
No | No | No
tabindex | The tabIndex of the rendered HTML tag. This attribute determines the position of the tag in the sequence of page elements that the user may advance through by pressing the TAB key.
Required | Supports runtime expression evaluation | Data bindable
No | No | No
tagId | String value. Sets the `id` (or `name`) attribute of the rendered HTML tag. Note that the real id attribute rendered in the browser may be changed by the application container (for example, Portal containers may change the rendered id value to ensure the uniqueness of id's on the page). In this case, the real id rendered in the browser may be looked up through the JavaScript function getNetuiTagName( tagId, tag ). For example, assume that some tag's `tagId` attribute is set to `foo`.
        <netui:textBox tagId="foo" />
Then the following JavaScript function will return the real id attribute rendered in the browser:
        getNetuiTagName( "foo", this )
To get a <netui:form> element and all of its children elements in JavaScript, use the same JavaScript function `getNetuiTagName( tagId, tag )`. For example, assume that there is a <netui:form> whose tagId attribute is set to `bar`.
        <netui:form tagId="bar" >
Then the following JavaScript function will return the <netui:form> element and its children (packaged as an array).
        document[getNetuiTagName( "bar", this )]
To retreive the value entered into a <netui:textBox> within the <netui:form> tag, use the following JavaScript expression.
        document[getNetuiTagName("bar", this)][getNetuiTagName("foo", this)].value
The second parameter ensures that the JavaScript function begins its search within the correct Portlet scope. Pass the JavaScript keyword `this` as the second parameter. For detailed information on using the function `getNetuiTagName( tagId, tag )` see Using JavaScript in Page Flow and Portal Applications.
Required | Supports runtime expression evaluation | Data bindable
No | Yes | No
value | A String literal or a data binding expression. The value attribute determines the value submitted by the checkbox.
Required | Supports runtime expression evaluation | Data bindable
No | Yes | Yes

## Sample

In this sample, a set of <checkBoxOption> tags are submitted to the `processData` action method.

         <netui:form action="processData">
              <netui:checkBoxGroup dataSource="{actionForm.data}" defaultValue="{actionForm.defaultChoices}">
                  <netui:checkBoxOption value="wantSpecialCDOffers">Do you want to be notified of special CD offers?</netui:checkBoxOption><br>
                  <netui:checkBoxOption value="wantSpecialDVDOffers">Do you want to be notified of special DVD offers?</netui:checkBoxOption><br>
              </netui:checkBoxGroup>
              <netui:button value="Submit" type="submit"/>
          </netui:form>

## Code Sample

[BEA_HOME]/weblogic81/samples/workshop/SamplesApp/WebApp/tagSamples/netui/checkBoxOption/

## Related Topics

<netui:checkBoxOption> Tag Sample

<netui:checkBoxGroup> Tag Sample

<netui:checkBoxGroup> Tag

<netui:checkBox> Tag