interactive rating component

I had problems with the JavaScript part specifically the part where i had to display different star based on the user chosen rating .i did my research and had a hang of it here is the code snippet

function userRating(ratingNumber) {
    ratingStar.innerHTML =" ";
    for (var i = 0; i<ratingNumber; i++) {
        var addDiv = document.createElement("div");
        addDiv.classList.add("add-rating-star");
        ratingStar.appendChild(addDiv);
    }
}