How to Make an Online Test for Gamepad Controller Using HTML5 Gamepad API
Tags: gamepad, html, javascript, controller
Published: 2022-01-14 13:22:30

In this tutorial, we will learn how to make an online test for [Gamepad Controllers](https://en.wikipedia.org/wiki/Game_controller) with [HTML5 Gamepad API](https://www.w3.org/TR/gamepad/). Let’s get started! 
We will use the following code to create a simple gamepad controller input test:

---
**HTML**
```
<html>
<head>
<meta charset="utf-8">
<script type="text/javascript" src="gamepadtest.js"></script>
<style>
.axes {
  padding: 1em;
}

.buttons {
  margin-left: 1em;
}

.axis {
  min-width: 200px;
  margin: 1em;
}

.button {
  display: inline-block;
  width: 1em;
  text-align: center;
  padding: 1em;
  border-radius: 20px;
  border: 1px #47347C;
  background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAIAAACQd1PeAAAAAXNSR0IArs4c6QAAAAxJREFUCNdjYPjPAAACAgEAqiqeJwAAAABJRU5ErkJggg==);
  background-size: 0% 0%;
  background-position: 50% 50%;
  background-repeat: no-repeat;
}

.pressed {
  border: 1px #ED1F6A;
}

.touched::after {
  content: "touch";
  display: block;
  position: absolute;
  margin-top: -0.2em;
  margin-left: -0.5em;
  font-size: 0.8em;
  opacity: 0.7;
}
</style>
</head>
<body>  
  <h2 id="start">Press a button on your controller to start</h2>
<a href="https://github.com/davidcmoffitt/gamepad"><img style="position: absolute; top: 0; right: 0; border: 0;" src="https://s3.amazonaws.com/github/ribbons/forkme_right_green_007200.png" alt="Find me on GitHub"></a>  
</body>
</html>
```
---
**CSS**
```
var haveEvents = 'GamepadEvent' in window;
var haveWebkitEvents = 'WebKitGamepadEvent' in window;
var controllers = {};
var rAF = window.mozRequestAnimationFrame ||
  window.webkitRequestAnimationFrame ||
  window.requestAnimationFrame;

function connecthandler(e) {
  addgamepad(e.gamepad);
}
function addgamepad(gamepad) {
  controllers[gamepad.index] = gamepad; var d = document.createElement("div");
  d.setAttribute("id", "controller" + gamepad.index);
  var t = document.createElement("h1");
  t.appendChild(document.createTextNode("gamepad: " + gamepad.id));
  d.appendChild(t);
  var b = document.createElement("div");
  b.className = "buttons";
  for (var i=0; i<gamepad.buttons.length; i++) {
    var e = document.createElement("span");
    e.className = "button";
    e.innerHTML = i;
    b.appendChild(e);
  }
  d.appendChild(b);
  var a = document.createElement("div");
  a.className = "axes";
  for (i=0; i<gamepad.axes.length; i++) {
    e = document.createElement("meter");
    e.className = "axis";
    e.setAttribute("min", "-1");
    e.setAttribute("max", "1");
    e.setAttribute("value", "0");
    e.innerHTML = i;
    a.appendChild(e);
  }
  d.appendChild(a);
  document.getElementById("start").style.display = "none";
  document.body.appendChild(d);
  rAF(updateStatus);
}

function disconnecthandler(e) {
  removegamepad(e.gamepad);
}

function removegamepad(gamepad) {
  var d = document.getElementById("controller" + gamepad.index);
  document.body.removeChild(d);
  delete controllers[gamepad.index];
}

function updateStatus() {
  scangamepads();
  for (j in controllers) {
    var controller = controllers[j];
    var d = document.getElementById("controller" + j);
    var buttons = d.getElementsByClassName("button");
    for (var i=0; i<controller.buttons.length; i++) {
      var b = buttons[i];
      var val = controller.buttons[i];
      var pressed = val == 1.0;
      var touched = false;
      if (typeof(val) == "object") {
        pressed = val.pressed;
        if ('touched' in val) {
          touched = val.touched;
        }
        val = val.value;
      }
      var pct = Math.round(val * 100) + "%";
      b.style.backgroundSize = pct + " " + pct;
      b.className = "button";
      if (pressed) {
        b.className += " pressed";
      }
      if (touched) {
        b.className += " touched";
      }
    }

    var axes = d.getElementsByClassName("axis");
    for (var i=0; i<controller.axes.length; i++) {
      var a = axes[i];
      a.innerHTML = i + ": " + controller.axes[i].toFixed(4);
      a.setAttribute("value", controller.axes[i]);
    }
  }
  rAF(updateStatus);
}

function scangamepads() {
  var gamepads = navigator.getGamepads ? navigator.getGamepads() : (navigator.webkitGetGamepads ? navigator.webkitGetGamepads() : []);
  for (var i = 0; i < gamepads.length; i++) {
    if (gamepads[i] && (gamepads[i].index in controllers)) {
      controllers[gamepads[i].index] = gamepads[i];
    }
  }
}

if (haveEvents) {
  window.addEventListener("gamepadconnected", connecthandler);
  window.addEventListener("gamepaddisconnected", disconnecthandler);
} else if (haveWebkitEvents) {
  window.addEventListener("webkitgamepadconnected", connecthandler);
  window.addEventListener("webkitgamepaddisconnected", disconnecthandler);
} else {
  setInterval(scangamepads, 500);
}
```
---

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##A Breakdown of the Different Types of Game Controllers

There are many different types of [game controllers](https://www.computerhope.com/jargon/g/gamepad.htm) available in the market. But not all of them are suitable for every gamer. In order to get the best controller for your needs, you need to know which type of controller you want and how it can be used.

###There are three different types of game controllers: 
a) traditional console controllers, 
b) advanced controllers, 
c) gamepad for mac.
you can test all of these exciting gamepad controllers on this site: [https://gamepadtest.com](https://gamepadtest.com/)

A traditional console controller is a wireless device that connects to the console via USB or Bluetooth. They work with most games and consoles but they require an extra power outlet. They also don’t have any kind of internal memory so they can’t save your progress or settings in-game like other modern controllers do.

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##Gaming Styles
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