Looping backwards through Array setting checkbox defaults depending on separate values

[Sean5C60]

I have an array of checkboxes called slots and a text field called level. I want the number of checkboxes checked by default to equal the number in level. I made this function.

function SetSlots()
{
for (i=0;i<level.value;i++)
{this.getField(slots[i]).defaultIsChecked(0, true);}
};

this works when increasing the value of 'level' but I did not define the conditions for changing the default to unchecked. I figure I need a way to define the amount of boxes checked by default (x) and compare them to 'level'.

if (x > level.value){};

 Now I need a way to uncheck the boxes according to the difference between x and level and moving in reverse so I made this function.

function RemoveSlots()
{
for (i=0;i<x-level.value;i--)
{this.getField(slots[i]).defaultIsChecked(0, false);}
};

The final script I am trying to use

SetSlots()
else if (x>level.value)
RemoveSlots();

The issues I am having are in properly defining the number of boxes checked by default. Currently working with this in the document level

var x = 0;
for(i=0; i<slots.length; i++){
if(this.getField(slots[i]).defaultIsChecked(0,true))x++};

It does not return anything except 0 so I know I have something wrong here.

My second issue is with the RemoveSlots() function only unchecking the 1ist box.
I know I have something wrong but I can't figure out what. As always, any help is always appreciated!
Thanks for reading.

[Sean5C60 · Accepted solution]

I had an aha moment. The remove function doesn't work because I had the loop start at the beginning not the end.  Also the difference I needed was between the total number of boxes and the level.value. Seeing that I was able to fit it all in one function 

function SetSlots()
{
for (i=0;i<level.value;i++)
{this.getField(slots[i]).defaultIsChecked(0, true);}
for (i=level.value;i<22-level.value;i++)
{this.getField(slots[i]).defaultIsChecked(0, false);}
};

Hopefully that will help someone with part of the issue. I am still curious as to why the checked variable returns only zero.

[try67]

- Where do you define the level and slots arrays?

- defaultIsChecked doesn't actually change anything, it just returns a value about the current state of the group.

[Sean5C60]

I have those variables at document level along with the function. I call the function in a longer conditional equation attatched to a text field. As of right now the function does make the checkboxes I want checked by default. If there is a more stable or simple way of doing this, I would love to learn it. I am trying to teach myself Javascript so I understand just because it works doesn't mean it's right.

[Sean5C60]

Ah so my issue with the checked returning zero is because I wasn't phrasing it correctly

maybe

var x = 0;
for(i=0; i<slots.length; i++){
if(this.getField(slots[i]).defaultIsChecked(0,true))x++};

should be 

if (this.getField(slots[i]).value !=="Off")x++}; ?