A jQuery plugin to show and hide follow up questions in a form. The follow ups are specified through HTML5 [data-*] attributes.

⚠️ This project has been archived

No future updates are planned. Feel free to continue using it, but expect no support.


Include the script after jQuery has been loaded. It will check all existing form elements and automatically initilaize follow-up questions when the page has loaded.

Note: currently only <input type="radio" /> or <input type="checkbox" /> can have follow up questions, visible when the input has been checked.

Markup for a single question (form input) that has a follow up question:


“sibling” assumes the follow up question(s) containers shares the same parent element.


“selector” allows addressing any other data-target="..." container element(s) with a jQuery style selector.

Markup for containers with multiple radio buttons inside:


Markup for a question that is [required] when it is a follow up question. Normal [required] attributes do not work, as they input fields are hidden if they’re not triggered as follow up questions.


Markup for the container of a follow up container


Example with a group of radio buttons

Only one of the <input type="radio" /> buttons has a follow up question. Since they are in the same group, they will be evaulated together. Changing from yes to no will change the visibility of the follow up question <textarea>.

<p data-has-follow-ups="">
    Have you ever had a close encounter with a UFO (Unidentified Flying Object)?
    <label><input type="radio" name="seen-ufo" required="required" data-has-follow-up="sibling" /> Yes
        <label data-is-follow-up="">Please explain the encounter, especially what kind it was
            <textarea data-is-follow-up-required="required"></textarea>
    <label><input type="radio" name="seen-ufo" required="required" /> No</label>


  • Use with <select> dropdowns.
  • Use with other <input /> types and <textarea>?
  • Use dynamic change listener - or - expose a function to dynamically add questions with follow ups.
  • Animations when showing/hiding elements.
  • Package the plugin better.

Runtime dependencies


Copyright (c) 2012, 2013, 2014, 2015 Joel Purra All rights reserved.

When using FollowUp, comply to at least one of the three available licenses: BSD, MIT, GPL. Please see the LICENSE file for details.