immediate attribute

Type:	boolean
Inherited:	no
Used By:	input
Default:	false

This attribute changes the behaviour of a drop-down list form field in Acrobat. With false, the default, the value isn't committed until the field loses focus. Setting this to true will commit the value immediately after the new value is chosen.

The values in this drop-down will be committed immediately after they're changed.

<input type="select" name="country" immediate="true">
  <option>USA</option>
  <option>Germany</option>
  <option>UK</option>
  <option>France</option>
  <option>Canada</option>
</input>