Remove default value from dropdown list

I am currently working with Acrobat XI Pro version. I want to know whether it is possible to remove the default value from a dropdown list.
When the list has less than 4 items, it is possible to deselect the default value by pressing the whitespace below. However, when there are more items, this is not possible anymore.
I have read that you should include a whitespace as item in the item list, however, then you will see an empty list item when people are working with the pdf which is not preferable.
So, does anyone know how to remove the default value from a dropdown list?
Thanks!

Ok, I found a perfect workaround for my problem using FormsCentral for Acrobat. Here is what you should do:
Step 1:
-   Open FormsCentral
-   Create New Form (Choose Blank Form)
-   Click on the dropdown icon to create a new dropdown
-   Fill in the list items by clicking on the edit (you also can add a label if you want)
-   Click: File > Save as PDF Form...
Step 2:
-   Open the saved PDF (you now see a blank pdf with a dropdown menu)
-   Click: Tools > Forms > Edit Form (when a popup shows that you should save a copy of the document in order to make changes, press "Save as a copy" and open the pdf copy file with Acrobat)
-   Select the dropdown, copy the dropdown and paste it in the desired document
Now you have a dropdown menu without a default choice. Keep in mind that you cannot edit the items in the dropdown, because a default choice will be chosen and you have to use the pdf copy file again. As long as you don't click on a list item, it doesn't choose a default choice.
It is not a perfect solution, but it works for me.
Good luck and thanks!

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http://download.oracle.com/docs/cd/B19306_01/server.102/b14200/statements_3001.htm
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Change the order for dialogresults:
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I need to populate a field as the default value from another field that the user inputs. I've tried the scripting that I found from the below Topic in the Archived Forums, but I'm not able to make it work. I've tried numerous variations and still to no avail. I tried to make the scripting work in Acrobat 6 and then decided that maybe I needed to upgrade, so I'm now trying it in Acrobat 8 with no results. Can anyone help?
Topic
Acrobat 5 - field with default value of another field
Ben PF - 03:31am Mar 23, 2007 Pacific
How can I have a field date2 which has the default value of field date1, but which can be edited by the user if necessary without changing the value of date1.
I've tried, but I just can't figure it out!
Any help much appreciated.
Ben
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Gene Dianoski - 5:22am Mar 23, 07 PST (#1 of 2)
This, or some variation of this, should work:
if(this.getField("date2").value == ""{
this.getField("date2").value = this.getField("date1).value;
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Ben PF - 6:49am Mar 23, 07 PST (#2 of 2)
Thanks very much.
I put it in at document level to start, but it didn't run the script automatically when date1 was first filled in, so I have put it in as a mouse exit action in date1 and it works a treat.
Thanks for your help.
Ben

Okay forget what I posted above and lets start over. Go to your first field and under Properties -> Actions Tab -> Select Trigger -> On Blur Run A JavaScript.
Put this:
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I'm not really looking for audience targeting in this case. I'm trying to find a different way to show a list. I want to have help areas on a page but have part of that page pull specific information based on the user logged in as to which row of the overall
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Remove default value from dropdown list

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