Get the new export value?

You need to refer to the correct object and property to capture this data. The 'this.getField("MyComboBox").value' within the focused field until the field is committed refers to the value prior to the field receiving focus or entry. You might try using the 'event.changeEx'. The 'changeEx' contains the value of the changed export value. The 'event.value' contains the value prior to the key press.

To see how all of this happens, try the following code in the custom keystroke script:

console.println("field value: " + this.getField("MyComboBox").value);
console.println("event value: " + event.value);
console.println("event changeEx: " + event.changeEx);

You will also need to set the combo box to 'commit immediately' and use the up and down arrow keys to select the option.

More information about events and event properties is contained in the Acrobat JS API Reference.

Ok I get it. It runs the script twice though witch results in different values in each run, and in the last run the changeEx value is null so I added if (event.changeEx){ .... and it only runs once, is that the correct way?

this is what prints in the console before my addition:
field value: 1
event value: One
event changeEx: 2
field value: 1
event value: Two
event changeEx:

However my script works the way I want with changeEx now, thank you.

It runs twice because it executes once when the item is selected and again when it is committed. To confirm, add the following line to what you have:

console.println("event willCommit: " + event.willCommit);

So your code should test for this property and execute the rest if it is false:

if (!event.willCommit) {

// rest of your code goes here.

The purpose of the script was to show how the different value properties (getField().value, event.value, and event.chagneEx) change when there is a change the selection in the combo box or drop down box. If you uncheck the 'commit select item immediately' option, the way the values display will change. There could even be a change if you use 'this.getField(event.target.name).value.