hbtuHacktoberfest2025/traffic_light.html at main · mevipinmaurya/hbtuHacktoberfest2025 · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
<!DOCTYPE html>
<html>
  <head>
    <title>Traffic Light</title>
  </head>
  <body style="display: flex; flex-direction: column; align-items: center">
    <h2>Traffic Light Simulation</h2>
    <div style="display: flex; flex-direction: row; align-items: center">
      <div
        id="red"
        style="
          height: 70px;
          width: 70px;
          border-radius: 50%;
          background-color: grey;
          margin: 10px;
        "
      ></div>
      <div
        id="yellow"
        style="
          height: 70px;
          width: 70px;
          border-radius: 50%;
          background-color: grey;
          margin: 10px;
        "
      ></div>
      <div
        id="green"
        style="
          height: 70px;
          width: 70px;
          border-radius: 50%;
          background-color: grey;
          margin: 10px;
        "
      ></div>
    </div>

    <button
      style="
        padding: 8px 20px 8px 20px;
        background-color: black;
        color: white;
        border-radius: 5px;
        margin-top: 10px;
        border: none;
        cursor: pointer;
      "
      onclick="toggleTraffic()"
    >
      Start/Stop
    </button>

    <script>
      const lights = ["red", "yellow", "green"];
      let index = 0;
      let running = true;
      function toggleTraffic() {
        running = !running;
      }

      setInterval(() => {
        if (!running) {
          return;
        } else {
          lights.forEach((color, i) => {
            document.getElementById(color).style.backgroundColor =
              i === index ? color : "grey";
          });
          index = (index + 1) % lights.length;
        }
      }, 1000);
    </script>
  </body>
</html>