この記事はまだボランティアによって 日本語 に翻訳されていません。ぜひ MDN に参加して翻訳を手伝ってください!
The GamepadButton
interface defines an individual button of a gamepad or other controller, allowing access to the current state of different types of buttons available on the control device.
A GamepadButton
object is returned by querying any value of the array returned by the buttons
property of the Gamepad
interface.
Note: This is the case in Firefox Gecko 28 and later; Chrome and earlier Firefox versions still return an array of double values when this property is accessed.
Properties
GamepadButton.value
Read only- A double value used to represent the current state of analog buttons, such as the triggers on many modern gamepads. The values are normalized to the range 0.0 —1.0, with 0.0 representing a button that is not pressed, and 1.0 representing a button that is fully pressed.
GamepadButton.pressed
Read only- A boolean value indicating whether the button is currently pressed (
true
) or unpressed (false
).
Example
The following code is taken from my Gamepad API button demo (you can view the demo live, and find the source code on Github.) Note the code fork — in Chrome Navigator.getGamepads
needs a webkit
prefix and the button values are stored as an array of double values, whereas in Firefox Navigator.getGamepads
doesn't need a prefix, and the button values are stored as an array of GamepadButton
objects; it is the GamepadButton.value
or GamepadButton.pressed
properties of these we need to access, depending on what type of buttons they are. In this simple example I've just allowed either.
function gameLoop() { if(navigator.webkitGetGamepads) { var gp = navigator.webkitGetGamepads()[0]; if(gp.buttons[0] == 1) { b--; } else if(gp.buttons[1] == 1) { a++; } else if(gp.buttons[2] == 1) { b++; } else if(gp.buttons[3] == 1) { a--; } } else { var gp = navigator.getGamepads()[0]; if(gp.buttons[0].value > 0 || gp.buttons[0].pressed == true) { b--; } else if(gp.buttons[1].value > 0 || gp.buttons[1].pressed == true) { a++; } else if(gp.buttons[2].value > 0 || gp.buttons[2].pressed == true) { b++; } else if(gp.buttons[3].value > 0 || gp.buttons[3].pressed == true) { a--; } } ball.style.left = a*2 + "px"; ball.style.top = b*2 + "px"; var start = rAF(gameLoop); };
Specifications
Specification | Status | Comment |
---|---|---|
Gamepad The definition of 'GamepadButton' in that specification. |
Working Draft | Initial definition |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
---|---|---|---|---|---|
General support | 21.0 webkit 35.0 |
29.0 (29.0) | Not supported | 15.0 webkit 22.0 |
Not supported |
Feature | Android | Firefox Mobile (Gecko) | IE Phone | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|
General support | Not supported | 32.0 (32.0) | Not supported | Not supported | Not supported |