HTML5 Combobox adding more items?

Hi,

I am looking for a way to add more dropdown items to the HTML5 combobox component by adding them to the items category

I am able to access the features of disabled, visible and value just fine by calling these lines

• document.getElementById('COMBO_BOX_NAME').value ✅
• document.getElementById('COMBO_BOX_NAME').disabled ✅
• document.getElementById('COMBO_BOX_NAME').visible ✅

But for some reason when I try to add objects to the item array nothing seems to happen?

Basic addition to arr object

var array = new Array();

var obj = new Object();

obj.label = 'Label';

obj.data = 'Data';

arr.push(obj)

Methods tried for adding to the combo box

• document.getElementById('COMBO_BOX_NAME').items = array ❌
• document.getElementById('COMBO_BOX_NAME').items.push(obj) ❌
• document.getElementById('COMBO_BOX_NAME').items = [{label: 'Label', data: 'Data'}] ❌ (Manual Entry seems to not work either!)

Is the items variable an array or an object? I've tried both and cant seem to store data there

Thanks