How do I hide/show elements of the form based on the screen width?

Is there a way to hide certain widgets or elements if it is viewed in mobile?

for example:

http://form.jotformpro.com/form/50005155818954

I am testing a testimonal plug in but may want to hide it if someone is viewing on their phone?

I did find a support questions about hiding and showing fields but you have to know the element ID and I cant find it. I assume because it is a widget. How can I hide the testimonial widget on mobile view?

Yes, you're correct. The IDs for some field types are not shown in their properties. In such cases you would need to either view the source of the form's page or use the developer tools (like Firebug) of your browser to find out the ID. In Chrome, if you right-click the Testimonial widget and then click Inspect Element,

you would discover that the widget is contained within the li element having an ID of id_34:

Once armed with that information, you can have the widget hidden when the screen width goes below a certain threshold by inserting the following rule into the block of code in the form's injected CSS which targets mobile screens:

#id_34 {
  display: none;
}

To simplify matters for you, I've edited a copy of your jotform's injected CSS and saved it to a page. Copy all of this code to your computer clipboard. Delete all of the form's injected CSS and paste the code from your clipboard in its place. Your jotform should now work like this clone.

If you need further help with this, we'd be happy to provide it.

Cheers 

I forgot to mention that due to a small glitch which will be fixed next week, you will need to post your reply in the thread itself (http://www.jotform.com/answers/489441) and not via email.

Thanks