Joomla! Programmers Documentation

The radio form field type provides radio buttons to select options. If the field has a saved value, this is selected when the page is first loaded. If not, the default value (if any) is selected.

• type (mandatory) must be radio.
• name (mandatory) is the unique name of the field.
• label (mandatory) (translatable) is the field html label.
• description (optional) (translatable) is the field description.
• default (optional) is the default password.
• class (optional) is a CSS class name for the HTML form field. If set to class="btn-group btn-group-yesno" will show coloured buttons.
• layout (optional) can be used to set a Layout for the switcher. Eg. if set to layout="joomla.form.field.radio.switcher" will use the Joomla Radio-Switcher Layout.

The XML <field> element must include one or more <option> elements which define the individual radio button items. The text between the <option> and </option> tags is shown as the label for the radio button and is a translatable string. The <option> tag takes the following argument:

• value (mandatory) is the value that will be saved for the parameter if this item is selected.

Tip: Don't forget to close the field definition with </field>.

Implemented by: libraries/src/Form/RadioField.php

Example XML parameter definition¶

<field 
        name="myradiovalue" 
        type="radio" 
        default="0" 
        label="Select an option" 
        description="">
        <option value="0">1</option>
        <option value="1">2</option>
</field>

Styling with arbitrary values:

<field 
        name="myradiovalue" 
        type="radio" 
        default="0" 
        label="Select an option" 
        description=""
        class="btn-group">
        <option value="0">1</option>
        <option value="1">2</option>
</field>

Styling with yes/no values:

<field 
        name="myradiovalue" 
        type="radio" 
        default="0" 
        label="Select an option" 
        description=""
        class="btn-group btn-group-yesno">
        <option value="0">JNo</option>
        <option value="1">JYes</option>
</field>

Styling with yes/no values as Switcher:

<field 
        name="myradiovalue" 
        type="radio" 
        default="0" 
        label="Select an option" 
        description=""
        layout="joomla.form.field.radio.switcher">
        <option value="0">JNo</option>
        <option value="1">JYes</option>
</field>

See also¶

• List form field type