In your form design you will first have to add a subform to contain the fields you wish to hide/show either below or to the side of your dropdown list. Set this subform to invisible or hidden to start with.
Then use the action builder to apply an action to your drop-down list. To define an action for your drop-down list box, right-click on the list box and select Actions -> Add Action ... This will open the action builder dialog where you can set the condition for the dropdown.
For example to apply an action based on its value (ie YES), change the Condition so that it reads "text selected" and set the next drop-down to your value (YES). In the result box, select "Show or Hide an Object" from the list, then click on the (object) hyperlink which allows you to browse the object tree. Select the hidden subform you have just added to your form and then set visible in the next drop down. This should display the hidden subform when the value is Yes.
You will then have to add another action to handle No, but this time hiding it instead of making it visible.
Looks ok from here. Do you have a sample pdf you can post somewhere and I can take a look at? Are you looking at the form in pdf preview or something else?
im opening the pdf file in Adobe Acrobat Reader X.
here is the sample file : http://www.4shared.com/office/3L0DXn3j/Untitled1.html
and when i tried to add another action to drop down list i cant save it.
check out this image :
OK button isnt clickable.
When you need to change the layout of a document in any way, you need to save the pdf as a dynamic pdf. You currently have it saved in designer as a static pdf which is why nothing happens. Just do a File->Save As and select Dynamic PDF from the list. When you preview it next time it will switch over to dynamic pdf.
but now i cant add more actions
as you can see my last post i cant click on "OK" button
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In your screenshot, you havent set the (object) to anything which is why the ok button is grayed out. Set it to the subform you wish to show/hide. I didnt have any issues having multiple actions. Just need to make sure you complete the information in the dialog correctly
sorry for the stupid question
all issues cleared!