Show/Hide Custom text field based on Another custom field selected value.

Hopefully someone might be able to lend a hand. I have what you guys might say is an easy one but damned if I can figure it out.


I have a custom dropdown field (id 12000) with 4 options Critical, High, Medium, Low.

I have a custom free text multi line field (id 12001) that I would like to only show on the create screen when Critial is selected.

I do not have much scripting experience I came across this script listed below and then didn't know where to go. I would like to be able to just paste this into the description of the 12001 field and keep on rolling. any help would be greatly appreciated. 

<script type="text/javascript">

  priority = document.getElementById('priority');

  if (priority) {

      target = document.getElementById('customfield_10000');

      // Hide the target field if priority isn't critical

      if (priority.value != 2)'none';


      priority.onchange=function() {

          if (this.value == 2) {              

            = ''; 

                     target.value="enter message here";

                  } else {






1 answer

Hi Michael,

You can do this using the Power Scripts add-on.

There is a video tutorial walking you through in detail along with the code here.

Let me know if you have any questions.

Hope you can make it work!

Thanks Ethan, Im going to give this a shot I'll let you know how it goes. Thanks again

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