javascript help needed: Trapping "null" from pop up menu so it doesn't display

[Steve_Egge@adobeforums.com]

I am making some interactive forms which use the app.popUpMenuEx routene to make a pop up menu.

When the menu is clicked on incorrectly ... the word Null is returned and is visable on the form field.

I would like to "trap" this so it is not visable, leaving the form blank so someone could tab into the field and type an alternative if it isn't present on the pop up menu.

Could someone help me with this ... here is what I have

var x = this.getField ("med") //define field variable x
cChoice = app.popUpMenuEx
(
{cName:"Flovent 44 MDI"},
{cName:"Flovent 110 MDI"},
{cName:"Flovent 220 MDI"}
)

med.value = ""+ cChoice +""

OK ... now I tried to trap the null so it wouldn't display by trying this ... but I'm doing something wrong. (javascript newbie)

if (""+ cChoice +"" == null)
then (med.value = " ")
else (med.value = ""+ cChoice +"")

but that doesn't work ...
Can anyone skilled at javascript help me so that the word null doesn't display if the pop up menu is exited incorrectly

Thanks ...

Steve Egge MD

[George_Johnson@adobeforums.com]

var x = this.getField ("med") //define field variable x cChoice = app.popUpMenuEx
( {cName:"Flovent 44 MDI"}, {cName:"Flovent 110 MDI"}, {cName:"Flovent
220 MDI"}






That should be: var cChoice = app.popUpMenuEx...

med.value = ""+ cChoice +""




You don't want to do that yet, and no need to add the empty strings.

if (""+ cChoice +"" == null)




There's no way that will equal null, since you're adding the empty strings. Do this:

if (cChoice == null)

then (med.value = " ")




There is no "then" keyword in JavaScript.

else (med.value = ""+ cChoice +"")




The code might look like this:

if (cChoice == null) med.value = "";
else med.value = cChoice;

George