Blank option in PDF Dropdown

New Here ,
Oct 08, 2013 Oct 08, 2013

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I have a number of PDF forms created in Adobe Acrobat that have a required drop down list.

Originally I had been adding a blank option to the top of the lists (by hitting the space bar in the Item Name and leaving the Export Value empty), so that the form displays blank when opened.

However, we had a series of forms submitted (using Adobe Reader and a "Submit a Form" button - the built-in one that comes with Acrobat not a custom javascript button) that some of the required dropdown lists have been left blank.

I then realized that because the "blank" option in the dropdown is not technically "null" or empty but a space that the Submit a Form button is not catching it as being empty and allows the form to be submitted.

1) Adobe: Why is there not a true "add a blank" option to the dropdown list properties that passes a "null" value so the Submit a Form button form works properly???

2) Since there isn't such an option, how do I keep the forms from being submitted when the dropdowns are left blank?  I'd rather not have to embed a bunch of javascript into the forms to check for something that should be built in.

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LEGEND ,
Oct 08, 2013 Oct 08, 2013

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For #1, that's just the way it is. For #2, you will have to use JavaScript.

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Community Expert ,
Oct 09, 2013 Oct 09, 2013

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I agree that it's a missing feature, but there's nothing we can do about it, or explain why it is so...

You can request new features here: http://www.adobe.com/cfusion/mmform/index.cfm?name=wishform

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LEGEND ,
Oct 09, 2013 Oct 09, 2013

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If you load the drop down or list box using JavaScript it is possible to have null value but this is not the standardized method and can make updating the list by others difficult or Adobe could do something that treats this as an error or something else.

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New Here ,
Apr 17, 2015 Apr 17, 2015

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#1 IS POSSIBLE! Just put a space bar!!!! and press ADD~! 2.PNG

YOU ARE WELCOME! I WAS WONDERING ABOUT THAT SAME THING MYSELF!

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LEGEND ,
Apr 17, 2015 Apr 17, 2015

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That is how it is done using the UI.

With JavaScript using the setItems, one can add a true null.

If you expect to be changing the or editing the list on a regular basis, It might be easier to use a document level JavaScript to populate the fields.

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New Here ,
Jan 12, 2021 Jan 12, 2021

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That worked perfectly! Thanks for the tip!

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New Here ,
Jan 11, 2022 Jan 11, 2022

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You human legend! There you have it ladies and gents

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New Here ,
May 12, 2022 May 12, 2022

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Unfortunately, this does not solve the problem.  They were using this method from the beginning, when he said, "Originally I had been adding a blank option to the top of the lists (by hitting the space bar in the Item Name and leaving the Export Value empty), so that the form displays blank when opened."

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