Fun random LED chart

random-led-chart.js

var columns = 200;
var ticker = document.getElementById("ticker");

for (var i = 0; i < columns; i++) {
    addTickerColumn();
}

function addTickerColumn() {
    var value = Math.floor(Math.random() * 5);
    var column = document.createElement("div");

    column.className = "ticker-column";

    for (var j = 0; j < 6; j++) {
        var cell = document.createElement("div");

        if (j < value) {
            cell.className = "ticker-cell dark";
        } else {
            cell.className = "ticker-cell";
        }

        column.appendChild(cell);
    }

    ticker.appendChild(column);
}

setInterval(function () {
    addTickerColumn();

    while (ticker.children.length > columns) {
        ticker.removeChild(ticker.firstElementChild);
    }
}, 1000);