Checkbox help

Question

HI,
I currently using javascript within a PDF to make a form simpler to use. I have a checkbox list with a sub-checkbox list within it (see below)
When filling in the form I need the user to only be able to check one item for the primary list and then a further item if the chekc the box with the sublist.
I have been able to achieve this using the following document level code and the mouse up - run javascript option.
function cbControl()
    var f1 = getField("Eligible activity 1"); (Area benefit checkbox above)
    var f2 = getField("Eligible activity 2"); (limited Clientle checkbox)
    var f3 = getField("Eligible activity 3"); (Housing checkbox above)
    var f4 = getField("Eligible activity 4"); (Jobs checkbox above)
    var f5 = getField("LCB sublist 1"); (Project activity maintains client records checkbox above)
    var f6 = getField("LCB sublist 2"); (Project activity has income eligiblity checkbox above)
    var f7 = getField("LCB sublist 3"); (Project activity is of such a nautre checkbox above)
    var f8 = getField("LCB sublist 4"); (Project activity clients are presumed checkbox above)
    if (event.target === f1) {
        f2.value = "Off";
        f3.value = "Off";
        f4.value = "Off";
        f5.value = "Off";
        f6.value = "Off";
        f7.value = "Off";
        f8.value = "Off";
        return;
    if (event.target === f2) {
        f1.value = "Off";
        f3.value = "Off";
        f4.value = "Off";
        return;
    if (event.target === f3) {
        f1.value = "Off";
        f2.value = "Off";
        f4.value = "Off";
        f5.value = "Off";
        f6.value = "Off";
        f7.value = "Off";
        f8.value = "Off";
        return;
    if (event.target === f4) {
        f1.value = "Off";
        f2.value = "Off";
        f3.value = "Off";
        f5.value = "Off";
        f6.value = "Off";
        f7.value = "Off";
        f8.value = "Off";
        return;
function sublistControl()
    var f1 = getField("Eligible activity 1");
    var f2 = getField("Eligible activity 2");
    var f3 = getField("Eligible activity 3");
    var f4 = getField("Eligible activity 4");
    var f5 = getField("LCB sublist 1");
    var f6 = getField("LCB sublist 2");
    var f7 = getField("LCB sublist 3");
    var f8 = getField("LCB sublist 4");
    if (event.target === f5) {
        f1.value = "Off";
        f3.value = "Off";
        f4.value = "Off";
        f6.value = "Off";
        f7.value = "Off";
        f8.value = "Off";
        return;
    if (event.target === f6) {
        f1.value = "Off";
        f3.value = "Off";
        f4.value = "Off";
        f5.value = "Off";
        f7.value = "Off";
        f8.value = "Off";
        return;
    if (event.target === f7) {
        f1.value = "Off";
        f3.value = "Off";
        f4.value = "Off";
        f5.value = "Off";
        f6.value = "Off";
        f8.value = "Off";
        return;
    if (event.target === f8) {
        f1.value = "Off";
        f3.value = "Off";
        f4.value = "Off";
        f5.value = "Off";
        f6.value = "Off";
        f7.value = "Off";
        return;
However no matter what I try, I can not get the 'Eligible activity 2' box to check if some one selects one of the sublists checkboxes. I have tried including the follwoing into the sublistControl code
if (event.target === f5) {
        f1.value = "Off";
        f2.value = "On"; (also tried f2.value = "Yes";)
        f3.value = "Off";
        f4.value = "Off";
        f6.value = "Off";
        f7.value = "Off";
        f8.value = "Off";
        return;
But this does not work. Can anybody suggest a solution??
Kind regards
Rhys

Answer 1

You need to use the Export Value of that box, although a better way is to use the checkThisBox() method, like so:
f2.checkThisBox(0,true);