lock dropdown menu once a selection is made

Explorer ,
Mar 11, 2019 Mar 11, 2019

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In a PDF form, is there a script that will lock a dropdown menu once a selection is made so that no further changes are possible?

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Acrobat SDK and JavaScript, Macintosh

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Adobe Community Professional ,
Mar 11, 2019 Mar 11, 2019

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Yes, Put this script into the Validation script for the dropdown.

event.target.readonly = (event.value.length > 0);

Did you want a way to unlock the field?

Thom Parker - Software Developer at PDFScripting
Use the Acrobat JavaScript Reference early and often

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Explorer ,
Mar 12, 2019 Mar 12, 2019

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Hi Thom, thanks for your response. Your script does work, however, I was a bit too brief in my original query. I've created two buttons on my PDF form—one to "lock" all fields and one to "unlock" all fields. I'm using the script below to lock all fields and a slightly modified version to unlock all. This script, however, does not work for the dropdowns. Is there a script I can add to what I already have? Thank you!

if (event.target.value != "Off") { 

this.getField("text").readonly = true; 

} else { 

this.getField("text").readonly = false; 

}

this.getField("Clear").readonly = true;

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Adobe Community Professional ,
Mar 12, 2019 Mar 12, 2019

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Setting readonly back to false works in my testing. But there is another way. Make one of the dropdown entries a single space, so it looks blank. You could actually make this anything that works for being an unset value. Then change the validation code to use this value as the key for locking the field.

event.target.readonly = (event.value != " ");

Setting the field to this value will unlock it.

Thom Parker - Software Developer at PDFScripting
Use the Acrobat JavaScript Reference early and often

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