Apache Struts 2 Documentation > Home > Guides > Tag Developers Guide > Struts Tags > Tag Reference > UI Tag Reference > radio |

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radio
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Added by digi9ten, last edited by Tom Schneider on Feb 18, 2007 (view change)

| Please make sure you have read the Tag Syntax document and understand how tag attribute syntax works.

| Important Note that the listkey and listvalue attribute will default to "key" and "value" respectively only when the list attribute is evaluated to a Map or its decendant. Other thing else, will result in listkey and listvalue to be null and not used.

## Description

Render a radio button input field.

## Parameters

#### Name | #### Required | #### Default | #### Evaluated | #### Type | #### Description
--- | --- | --- | --- | --- | ---
accesskey | false |  | true | String | Set the html accesskey attribute on rendered html element
cssClass | false |  | true | String | The css class to use for element
cssStyle | false |  | true | String | The css style definitions for element ro use
disabled | false |  | true | String | Set the html disabled attribute on rendered html element
id | false |  | true | String | id for referencing element. For UI and form tags it will be used as HTML id attribute
key | false |  | true | String | Set the key (name, value, label) for this particular component
label | false |  | true | String | Label expression used for rendering a element specific label
labelposition | false |  | true | String | Define label position of form element (top/left)
list | true |  | true | String | Iterable source to populate from. If the list is a Map (key, value), the Map key will become the option 'value' parameter and the Map value will become the option body.
listKey | false |  | true | String | Property of list objects to get field value from
listValue | false |  | true | String | Property of list objects to get field content from
name | false |  | true | String | The name to set for element
onblur | false |  | true | String | Set the html onblur attribute on rendered html element
onchange | false |  | true | String | Set the html onchange attribute on rendered html element
onclick | false |  | true | String | Set the html onclick attribute on rendered html element
ondblclick | false |  | true | String | Set the html ondblclick attribute on rendered html element
onfocus | false |  | true | String | Set the html onfocus attribute on rendered html element
onkeydown | false |  | true | String | Set the html onkeydown attribute on rendered html element
onkeypress | false |  | true | String | Set the html onkeypress attribute on rendered html element
onkeyup | false |  | true | String | Set the html onkeyup attribute on rendered html element
onmousedown | false |  | true | String | Set the html onmousedown attribute on rendered html element
onmousemove | false |  | true | String | Set the html onmousemove attribute on rendered html element
onmouseout | false |  | true | String | Set the html onmouseout attribute on rendered html element
onmouseover | false |  | true | String | Set the html onmouseover attribute on rendered html element
onmouseup | false |  | true | String | Set the html onmouseup attribute on rendered html element
onselect | false |  | true | String | Set the html onselect attribute on rendered html element
required | false | false | true | Boolean | If set to true, the rendered element will indicate that input is required
requiredposition | false |  | true | String | Define required position of required form element (left|right)
tabindex | false |  | true | String | Set the html tabindex attribute on rendered html element
template | false |  | true | String | The template (other than default) to use for rendering the element
templateDir | false |  | true | String | The template directory.
theme | false |  | true | String | The theme (other than default) to use for rendering the element
title | false |  | true | String | Set the html title attribute on rendered html element
tooltip | false |  | true | String | Set the tooltip of this particular component
tooltipConfig | false |  | true | String | Set the tooltip configuration
value | false |  | true | String | Preset the value of input element.

## Examples

In this example, a radio control is displayed with a list of genders. The gender list is built from attribute id=genders. The framework calls getGenders() which will return a Map. For examples using listKey and listValue attributes, see the section select tag. The default selected one will be determined (in this case) by the getMale() method in the action class which should retun a value similar to the key of the getGenters() map if that particular gender is to be selected.

    <s:action name="GenderMap" id="genders"/>
    <s:radio label="Gender" name="male" list="#genders.genders"/>