In order to change the color of CheckBoxList items you can use this code in an action Form’s rule, even=onLoad
try{
var checkBoxList = $('[id$="Checkboxlist1"]');
var options = checkBoxList[0].getElementsByTagName('input');
for (var i = 0; i < options.length; i++) {
if (i==0) { options[i].parentElement.style.color = 'red';}
if (i==1) { options[i].parentElement.style.color = 'green';}
if (i==2) { options[i].parentElement.style.color = 'blue';}
}
} catch (error) {
}
However, you cannot map this type of controls to form variables especially if it is multiple values, this control must be mapped to a multiple values choice type column in a list. It just inapplicable to use it the way we did with dropdown list.