How do you highlight a field if it's empty?

[niicoleloor]

I want to highlight or color a field when it's empty, how do you do it?

I've been trying out this formula but I think it's not correct because there's a Syntax Error:

var a1 = this.getField("FirstN");

if (a1.value == null)

{

a1.style.backgroundColor = "yellow";

}

[try67 · Accepted solution]

You have quite a lot of errors there... Try this code (as the field's custom validation script):

event.target.fillColor = (event.value=="") ? color.yellow : color.transparent;

[turnm]

This works great in Acrobat Pro, but the field colors won't change in Acrobat reader which is were most users fill out the form. Is there a way to code this in Pro so that the field colors will change in Acrobat reader?

[try67]

It will work exactly the same in Reader. If you don't see it working then make sure to disable the fields highlighting in the application.

[turnm]

I have disabled the highlighting fields on my desktop in Acrobat pro and I have saved the file. It works great on my desktop. All the empty fields appear yellow until they are filled in and then they turn transparent. But when I open the file in acrobat reader on my android phone or my ipad all the empty fields appear yellow, and when I enter info into the field they stay yellow and I want them to turn transparent.  I cannot see anywhere to turn off field highlighting on my android or ipad. Any suggestions? Thanks

[try67]

You didn't mention this was on a mobile device... I'm not sure you can turn it off there, and even if you did it's not likely that a script will work there, I'm afraid.

[Test Screen Name]

Field highlighting is a personal preference, for your device only. It doesn't affect what others see, so you need to test both with and without.

[Bernd Alheit]

Not all is possible in Acrobat Reader for iOS or Android:

https://www.adobe.com/devnet-docs/acrobatetk/tools/Mobile/iosapi/index.html