Displaying a Form Field Depending on Previous Question

Question

I develop my own template for Joomla and i need to display more options if you set a value before.

For example:

after clicking on YES:

It would be nice if in the joomla core a solution like this:

<field name="field1" type="radio" class="btn-group" default="0" label="Deactivate Joomla JavaScript" >
<option value="0">No</option>
<option value="1">Yes</option>
</field>
<field name="field2" type="checkboxes" class="btn-group" default="0" label="Deactivate Joomla JavaScript" showif="field1::1">
<option value="0">Everything</option>
<option value="1">mootools-core.js</option>
<option value="2">mootools-more.js</option>
</field>

A new showif parameter with the value field1::1 . field1 is the previous field and number 1 is for value from the needed option to display this form field.

Answer 1

The feature which you require was introduced in Joomla 3.3.x. You now have the ability to use showon="show_label:1"

You can se the PR, which introduced the functionality here: https://github.com/joomla/joomla-cms/pull/3127

Answer 2

Is it on the admin side or on the front end? Like for examaple you wanna insert one extra filed after selecting the menu item type on the admin site, this is what you need tot do: Edit the default.xml in :/components/com_yourcomponent/views/folios/tmpl/

<?xml version="1.0" encoding="utf-8"?>
 <metadata>
 <layout title="com_folio_folios_view_default_title" option="com_
 folio_folios_view_default_option">
  <message>
  <![CDATA[com_folio_folios_view_default_desc]]>
  </message>
 </layout>
 <fields name="request">
  <fieldset name="request">
   <field
    name="catid"
     type="category"
     extension="com_folio"
     class="inputbox"
     default=""
     label="COM_FOLIO_FIELD_CATID_LABEL"
     description="COM_FOLIO_FIELD_CATID_DESC"
     required="true"
    >
   <option value="0">JOPTION_SELECT_CATEGORY</option>
  </field>
  </fieldset>
 </fields>
</metadata>"

This one will insert a category selector after selecting your component from the popup window of your menu type.