I have 3 fields defined in my XML file like so:

<field name="field1" type="radio" label="Field 1" class="btn-group" default="1">
    <option value="1">JYES</option>
    <option value="0">JNO</option>

<field name="field2" type="radio" label="Field 2" class="btn-group" default="1">
    <option value="1">JYES</option>
    <option value="0">JNO</option>

<field name="field3" type="radio" label="Field 3" class="btn-group" default="1">
    <option value="1">JYES</option>
    <option value="0">JNO</option>

Now what I'd like to do is only show field3 if field1 and field2 are set to 1.

1 Answer 1


You can chain the attribute values of showon, using [AND], like so:


Adding more fields to the chain is also allowed.

On a side note, you can use an [OR] clause in the chain too, adding more complexity, for example:


Update for Joomla 3.7:

As of Joomla 3.7, you will be able to to use the ! operator (not equal to):


This means, if field1 does not equal 1

  • Is there a not equal to option for showon?
    – CoalaWeb
    Commented Feb 10, 2017 at 16:02
  • @CoalaWeb - That's what it's already doing. field1:1 means field1 == 1
    – Lodder
    Commented Feb 10, 2017 at 16:05
  • I'm looking for a != option for large/dynamic select lists that only have one option that would hide another form field rather than a large comma separated list. From my research it doesn't look like this exist I might look into a pull request, Cheers.
    – CoalaWeb
    Commented Feb 11, 2017 at 0:33
  • can you use !empty or !:* ?
    – Eoin
    Commented Jun 19, 2017 at 14:57
  • 1
    Apparently you can use showon="foo!:" I am yet to test. See here: joomla.stackexchange.com/questions/21022/form-field-showonempty
    – Eoin
    Commented Jun 28, 2017 at 11:26

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