Generate Comp based on dropdown list and checkbox selection?

Question

I currently have a dropdown list with three sizing options in it. Then I have two check mark boxes, one if checked ideally would create the template at its normal composition size and if the other checkbox is checked it would inverse the widthxheight of the composition size. Then below that I have a "generate" button that I want to be able to click and depending on my selections it creates the comp.
It sounds like I need some sort of if then statement but I'm having a hard time putting the two together. See below what I have so far.
There may be parts missing but I have it all working in a decibel pallate currently. I just don't have the functionality tied to a button yet.
Any help would be much appreciated!!!
(also I don't know how to format the extend script on here so apologies for that)
// palette controls
templateGen.VerticalCheckbox     = new Object();
templateGen.HorizontalCheckbox    = new Object();
// define values for the controls
templateGen.comLookup            = new Object();
templateGen.compLookup          = 'Template1';
templateGen.compLookup          = 'Template2';
templateGen.compLookup          = 'Template3';
function templateGen_getHashValues(hash)
  var ary = new Array();
  for (k in hash) {
  ary.push(hash[k]);
  return ary;
// "composition" menu
   var panelGrp1 = templateGen.palette.add('Panel', undefined, 'Comp Templates');
  compGrp1 = panelGrp1.add('group', undefined, 'Templates List');
  compGrp2 = panelGrp1.add('group', undefined, 'Orientation');
  compGrp3 = panelGrp1.add('group', undefined, 'Generate');
  templateGen.compList                                             = compGrp1.add('dropdownlist', LIST_DIMENSIONS, templateGen_getHashValues(bapple.compLookup));
  templateGen.compList.helpTip                                = "Choose the type device template you want here. All comps are 60fps.";
  templateGen.compList.selection                             = 'Template1';
  templateGen.compList.graphics.foregroundColor  = darkColorBrush;
  templateGen.VerticalCheckbox                           = compGrp2.add('checkbox', undefined, 'Vertical');
templateGen.VerticalCheckbox .value = true;
  templateGen.HorizontalCheckbox                          = compGrp2.add('checkbox', undefined, 'Horizontal');
  templateGen.HorizontalCheckbox .value = false;
templateGen.generateBtn1      = compGrp3.add('button', undefined, 'Generate');
  //applyBtn.onClick =????;

Answer 1

When I work with dropdowns I always like to attach the data they represent (like width and height of the comp in this case) directly to the items.
I didn't execute the code to really check it, but it should work like this:
// add templates to your dropdown and store the items in an array
var templates = [];
templates[0] = templateGen.compList.add('item','template1');
templates[1] = templateGen.compList.add('item','template2');
templates[2] = templateGen.compList.add('item','template3');
// attach a width and height to each item
templates[0].width= 1280;
templates[0].height= 720;
templates[1].width= 1024;
templates[1].height= 768;
templates[2].width= 1920;
templates[2].height= 1080;
// choose the item that should be selected by default
templates[0].selected = true;
applyBtn.onClick = function(){
        // read the width and height from the selected item
        var width = templateGen.compList.selection.width;
        var height =templateGen.compList.selection.height;
        if(templateGen.VerticalCheckbox.value){
              // swap width and height
              var temp = width;
              width = height;
              height = temp;
        // now create your comp here with the given width and height