Trying to use code found in working PDF from online in LC. (Keystroke Event)

Question

I found a PDF online (at http://www.planetpdf.com/developer/article.asp?ContentID=javascript_dynamic_updates_w) that works on my iPad running PDF Expert for iPad 5.0.4.
I tried to recreate it in LiveCycle ES4 using the same code. However, the author says to place the code in the "keystroke" event. I can't find a "keystroke" event. I've tried it and variations in change, preOpen, and exit without any success.
Can someone help me?
This is the exact functionality I need and the only example that I have seen work in both a PC environment and an iPad (running PDF Expert).
Thanks!
Dan
The code can be found at: http://www.planetpdf.com/developer/article.asp?ContentID=javascript_dynamic_updates_w
The sample PDF can be found at: http://www.planetpdf.com/codecuts/pdfs/Populate.pdf
I am specifically looking at the code in the dropdown box called "Three" - which is captioned as "Dynamic"
Code follows:
==========
/* This version updates a secondary combobox based on the entry
** selected by the user dynamically. The keystroke event should
** be processed until the value is about to be committed (as
** indicated by event.willCommit). */
if (!event.willCommit) {
    var f = this.getField("Four");
    f.clearItems();
    /* In a keystroke event, event.change contains the non-export value of the item selected by the user. */
    switch (event.change) {
        case "Cities":
          ;       f.setItems(["Paris", "Berlin", "Amsterdam", "Rome"]);
        break;
        case "Fruit":
          ;       f.setItems(["Bananas", "Mangos", "Strawberries", "Papayas"]);
        break;
        case "Garden Tools":
          ;       f.setItems(["Hoe", "Rake", "Leaf blower", "Shovel"]);
        break;

Answer 1

The first problem I see is that you are using an old version of WebUtil, which is not supported for use with Forms 10.1.2.3 and is probably the cause of the problem.
RegisterWebUtil - Loading WebUtil Version 1.0.6
The correct versions of frmwebutil.jar and webutil.pll are applied to Developer Suite installations and can be copied to Application Server. If you do not have an iDS installation, you can install the latest Forms Bundle patch which includes the correct WebUtil files. Refer to Patch ID 9593176 and Note 1188127.1. Be sure to review the ReadMe included with the patch.
The second problem is that you are using Jinitiator. Jinitiator has been obsolete for a long time. However, if you have some reason why you must use it, I would recommend that you at least get the last version released (1.3.1.30). This can be downloaded from within MyOracleSupport (account required) using Patch ID 7410076. If you do not have access to MyOracleSupport and you are using Forms 10.1.2.3, then you can use JRE6 (1.6.0_37). Do not attempt to use JRE7
http://www.oracle.com/technetwork/java/javase/downloads/jre6u37-downloads-1859589.html
You would need to install the 32bit version: jre-6u37-windows-i586.exe
References:
<li>Note: 566628.1
<li>Note: 561273.1