How to hide writing line in a fillable pdf?

[ericas91922901]

I have searched all over and can not seem to figure this out. I have 100+ pg workbook. 

I want it to have lines in case someone prints it out and wants to fill it out. But it also needs to be fillable. Since I can't control the line height when I make it fillable, I want to make the lines disappear (don't really need them when typing anyways). 

So what I would love to make happen is when the field is clicked on, the field background color becomes white but I can not get that figured out to save my life! I think I need to create a javascript to do this but everything I try isn't working. Does anyone know how? Here's a loom video walking thru it:

https://www.loom.com/share/ddbc45b1bcc54aea85b62f3bdc1f3f22

[Nesa Nurani]

To change field background color to white when it's clicked, run this script as 'Mouse Down' action:

event.target.fillColor = color.white;

[ericas91922901]

THANK YOU SO MUCH!!! It worked like a charm!

[try67 · Accepted solution]

That's a one-way street, though. I would do it using the On Focus and On Blur events.

The On Focus script will be:

event.target.fillColor = color.white;

The On Blur script will be:

if (event.target.valueAsString=="") event.target.fillColor = color.transparent;

That way the lines will become visible once more when the user exits the field, if it's empty.

[ericas91922901]

This is a BETTER solution! Thanks!!!