How can I make checkbox answers as dropdown list entries?

[adi_0000]

Hi all, 

I am trying to create a dropdown list with its selection generated from checkbox answers. For example if I tick 5 checkbox, the 5 answers from the checkbox will auto populate the dropdown list entries.  I have attached the picture below to give an example of what I meant:

I have tried using the script below to do this but it doesn't work.

// Get the dropdown field
var dropdown = this.getField("Root Cause");

// Get the checkbox field
var checkbox = this.getField("Low learning aptitude");

if (checkbox.value === "Yes") {
var isOptionExists = false;
for (var i = 0; i < dropdown.numItems; i++) {
if (dropdown.getItemAt(i).value === optionValue) {
isOptionExists = true;
break;
}
}

if (!isOptionExists) {
var count = dropdown.numItems
dropdown.insertItemAt("People - Low learning aptitude","People - Low learning aptitude");

}

}

If anyone can help it would be  much appreciated!

[Bernd Alheit]

Check the JavaScript console for errors.

[Nesa Nurani]

Collect checked answers into array and then set items to dropdown.

[Thom Parker]

 Give all of the checkboxes with a group name, for example "RootCauseQ.Low learning aptitude"

Then place the text you want displayed in the list for a particular checkbox, into the tooltip for that checkbox. 

This code will collect the answers and fill the text box.

var aItemList = [];
var aCheckList = this.getField("RootCauseQ");
for(var i=0;i<aCheckList.length;i++)
{
    if(aCheckList[i].value == "Yes")
        aItemList.push(aCheckList[i].userName);
}
this.getField("Root Cause").setItems(aItemList);