PappuKP/front-end-libraries-projects-build-a-drum-machine.markdown

## front-end-libraries-projects-build-a-drum-machine.markdown

      
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              front-end-libraries-projects-build-a-drum-machine.markdown
            
          
    Front End Libraries Projects - Build a Drum Machine

A Pen by Pappu Kumar Pashi on CodePen.
License.

  
## index.html
<head>
  <title>Front End Libraries Projects - Build a Drum Machine</title>
  <meta name="description" content="Build a Drum Machine">
  <meta name="keywords" content="HTML, CSS, JavaScript, React.js, freeCodeCamp, Front End Libraries Projects">
  <meta name="author" content="Chan Jian Hui Jonathan">
  <script src="https://cdn.freecodecamp.org/testable-projects-fcc/v1/bundle.js"></script>

</head>

<!--

Hello Camper!

For now, the test suite only works in Chrome! Please read the README below in the JS Editor before beginning. Feel free to delete this message once you have read it. Good luck and Happy Coding!

- The freeCodeCamp Team

-->
<div id="root"></div>

## script.babel
// !! IMPORTANT README:

// You may add additional external JS and CSS as needed to complete the project, however the current external resource MUST remain in place for the tests to work. BABEL must also be left in place.

/***********
INSTRUCTIONS:
  - Select the project you would
    like to complete from the dropdown
    menu.
  - Click the "RUN TESTS" button to
    run the tests against the blank
    pen.
  - Click the "TESTS" button to see
    the individual test cases.
    (should all be failing at first)
  - Start coding! As you fulfill each
    test case, you will see them go
    from red to green.
  - As you start to build out your
    project, when tests are failing,
    you should get helpful errors
    along the way!
    ************/

// PLEASE NOTE: Adding global style rules using the * selector, or by adding rules to body {..} or html {..}, or to all elements within body or html, i.e. h1 {..}, has the potential to pollute the test suite's CSS. Try adding: * { color: red }, for a quick example!

// Once you have read the above messages, you can delete all comments.

const audios = {
  Q: {
    keypad: "Q",
    audio: "https://s3.amazonaws.com/freecodecamp/drums/Heater-1.mp3",
    displayText: "Heater 1"
  },
  W: {
    keypad: "W",
    audio: "https://s3.amazonaws.com/freecodecamp/drums/Heater-2.mp3",
    displayText: "Heater 2"
  },
  E: {
    keypad: "E",
    audio: "https://s3.amazonaws.com/freecodecamp/drums/Heater-3.mp3",
    displayText: "Heater 3"
  },
  A: {
    keypad: "A",
    audio: "https://s3.amazonaws.com/freecodecamp/drums/Heater-4_1.mp3",
    displayText: "Heater 4"
  },
  S: {
    keypad: "S",
    audio: "https://s3.amazonaws.com/freecodecamp/drums/Heater-6.mp3",
    displayText: "Clap"
  },
  D: {
    keypad: "D",
    audio: "https://s3.amazonaws.com/freecodecamp/drums/Dsc_Oh.mp3",
    displayText: "Open HH"
  },
  Z: {
    keypad: "Z",
    audio: "https://s3.amazonaws.com/freecodecamp/drums/Kick_n_Hat.mp3",
    displayText: "Kick n' Hat"
  },
  X: {
    keypad: "X",
    audio: "https://s3.amazonaws.com/freecodecamp/drums/RP4_KICK_1.mp3",
    displayText: "Kick"
  },
  C: {
    keypad: "C",
    audio: "https://s3.amazonaws.com/freecodecamp/drums/Cev_H2.mp3",
    displayText: "Closed HH"
  }
};

const DrumPad = props => {
  const padId = props.keypad.displayText.replace(/\s/g, "-")
  return (
    <div onClick={props.onClick} id={padId} className="drum-pad">
      <audio src={props.keypad.audio} id={props.keypad.keypad} className="clip"/>
      {props.keypad.keypad}
    </div>
  );
};

const PadBank = props => {
  return <div id="container-bank">{props.children}</div>;
};

const InterfaceBank = props => {
  return <div id="container-interface">{props.children}</div>
}

const Display = props => {
  return <h1 id="display">{props.display}</h1>;
};

class DrumMachine extends React.Component {
  constructor() {
    super();
    this.state = {
      display: "",
      volume: 1
    }
  }
  componentDidMount() {
    document.addEventListener("keydown", this.handleKeyPress);
  }
  componentWillUnmount() {
    document.removeEventListener("keydown", this.handleKeyPress)
  }
  handleKeyPress = event => {
    const keypress = event.key.toUpperCase();
    const elementPressed = document.getElementById(keypress).parentElement
    elementPressed.click()
  };
  handleClick = event => {
    const element = event.target
    const audio = element.querySelector("audio");
    const display = audios[audio.id].displayText
    element.classList.toggle("drum-pad-active")
    setTimeout(() => element.classList.toggle("drum-pad-active"), 100)
    this.handleDisplay(display)
    this.handlePlay(audio);
  };
  handleDisplay = display => {
    this.setState({
      display: display
    })
  };
  handlePlay = audio => {
    audio.currentTime = 0;
    audio.volume = this.state.volume
    audio.play();
  };
  render() {
    const drumPads = Object.values(audios).map(audio => (
      <DrumPad keypad={audio} key={audio.keypad} onClick={this.handleClick} />
    ));
    return (
      <div id="drum-machine">
        <PadBank>{drumPads}</PadBank>
        <InterfaceBank>
          <Display display={this.state.display} />
        </InterfaceBank>
      </div>
    );
  }
}

ReactDOM.render(<DrumMachine />, document.getElementById("root"));

## scripts
<script src="https://unpkg.com/react@16/umd/react.development.js"></script>
<script src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script>

## style.scss
$background: #092834;
$borders: #FE2712;
$root: #F0F7D4;
$pad: #347B98;
$active: #B2D732;


* {
  box-sizing: border-box;
  margin: 0px;
  font-family: sans-serif;
}

#root {
  display: grid;
  justify-items: center;
  align-content: center;
  height: 100vh;
  background-color: $root;
}

#drum-machine {
  background-color: $background;
  width: 80%;
  height: 400px;
  border: 5px solid $borders;
  display: grid;
  grid-template-columns: 2fr 1fr;
  grid-template-rows: 100%;
  align-content: center;
  justify-items: center;
}

.drum-pad, .drum-pad-active {
  border: none;
  padding: 20px;
  border-radius: 5px;
  height: 100%;
  font-weight: bold;
  font-size: 2em;
  display: grid;
  justify-content: center;
  align-items: center;
  user-select: none;
}

.drum-pad {
  background-color: $pad;
}

.drum-pad-active {
  background-color: $active;
}

#display {
  background-color: $pad;
  height: 50px;
  width: 90%;
  display: grid;
  justify-content: center;
  align-items: center;
}

#container-bank, #container-interface {
  width: 100%;
  display: grid;
}

#container-bank {
  grid-template-columns: 30% 30% 30%;
  grid-template-rows: 30% 30% 30%;
  justify-content: center;
  align-content: center;
  grid-gap: 10px 10px;
}

#container-interface {

  grid-template-columns: 100%;
  justify-items: center;
  align-content: center;
}
	<head>
	<title>Front End Libraries Projects - Build a Drum Machine</title>
	<meta name="description" content="Build a Drum Machine">
	<meta name="keywords" content="HTML, CSS, JavaScript, React.js, freeCodeCamp, Front End Libraries Projects">
	<meta name="author" content="Chan Jian Hui Jonathan">
	<script src="https://cdn.freecodecamp.org/testable-projects-fcc/v1/bundle.js"></script>

	</head>

	<!--

	Hello Camper!

	For now, the test suite only works in Chrome! Please read the README below in the JS Editor before beginning. Feel free to delete this message once you have read it. Good luck and Happy Coding!

	- The freeCodeCamp Team

	-->
	<div id="root"></div>
	// !! IMPORTANT README:

	// You may add additional external JS and CSS as needed to complete the project, however the current external resource MUST remain in place for the tests to work. BABEL must also be left in place.

	/***********
	INSTRUCTIONS:
	- Select the project you would
	like to complete from the dropdown
	menu.
	- Click the "RUN TESTS" button to
	run the tests against the blank
	pen.
	- Click the "TESTS" button to see
	the individual test cases.
	(should all be failing at first)
	- Start coding! As you fulfill each
	test case, you will see them go
	from red to green.
	- As you start to build out your
	project, when tests are failing,
	you should get helpful errors
	along the way!
	************/

	// PLEASE NOTE: Adding global style rules using the * selector, or by adding rules to body {..} or html {..}, or to all elements within body or html, i.e. h1 {..}, has the potential to pollute the test suite's CSS. Try adding: * { color: red }, for a quick example!

	// Once you have read the above messages, you can delete all comments.

	const audios = {
	Q: {
	keypad: "Q",
	audio: "https://s3.amazonaws.com/freecodecamp/drums/Heater-1.mp3",
	displayText: "Heater 1"
	},
	W: {
	keypad: "W",
	audio: "https://s3.amazonaws.com/freecodecamp/drums/Heater-2.mp3",
	displayText: "Heater 2"
	},
	E: {
	keypad: "E",
	audio: "https://s3.amazonaws.com/freecodecamp/drums/Heater-3.mp3",
	displayText: "Heater 3"
	},
	A: {
	keypad: "A",
	audio: "https://s3.amazonaws.com/freecodecamp/drums/Heater-4_1.mp3",
	displayText: "Heater 4"
	},
	S: {
	keypad: "S",
	audio: "https://s3.amazonaws.com/freecodecamp/drums/Heater-6.mp3",
	displayText: "Clap"
	},
	D: {
	keypad: "D",
	audio: "https://s3.amazonaws.com/freecodecamp/drums/Dsc_Oh.mp3",
	displayText: "Open HH"
	},
	Z: {
	keypad: "Z",
	audio: "https://s3.amazonaws.com/freecodecamp/drums/Kick_n_Hat.mp3",
	displayText: "Kick n' Hat"
	},
	X: {
	keypad: "X",
	audio: "https://s3.amazonaws.com/freecodecamp/drums/RP4_KICK_1.mp3",
	displayText: "Kick"
	},
	C: {
	keypad: "C",
	audio: "https://s3.amazonaws.com/freecodecamp/drums/Cev_H2.mp3",
	displayText: "Closed HH"
	}
	};

	const DrumPad = props => {
	const padId = props.keypad.displayText.replace(/\s/g, "-")
	return (
	<div onClick={props.onClick} id={padId} className="drum-pad">
	<audio src={props.keypad.audio} id={props.keypad.keypad} className="clip"/>
	{props.keypad.keypad}
	</div>
	);
	};

	const PadBank = props => {
	return <div id="container-bank">{props.children}</div>;
	};

	const InterfaceBank = props => {
	return <div id="container-interface">{props.children}</div>
	}

	const Display = props => {
	return <h1 id="display">{props.display}</h1>;
	};

	class DrumMachine extends React.Component {
	constructor() {
	super();
	this.state = {
	display: "",
	volume: 1
	}
	}
	componentDidMount() {
	document.addEventListener("keydown", this.handleKeyPress);
	}
	componentWillUnmount() {
	document.removeEventListener("keydown", this.handleKeyPress)
	}
	handleKeyPress = event => {
	const keypress = event.key.toUpperCase();
	const elementPressed = document.getElementById(keypress).parentElement
	elementPressed.click()
	};
	handleClick = event => {
	const element = event.target
	const audio = element.querySelector("audio");
	const display = audios[audio.id].displayText
	element.classList.toggle("drum-pad-active")
	setTimeout(() => element.classList.toggle("drum-pad-active"), 100)
	this.handleDisplay(display)
	this.handlePlay(audio);
	};
	handleDisplay = display => {
	this.setState({
	display: display
	})
	};
	handlePlay = audio => {
	audio.currentTime = 0;
	audio.volume = this.state.volume
	audio.play();
	};
	render() {
	const drumPads = Object.values(audios).map(audio => (
	<DrumPad keypad={audio} key={audio.keypad} onClick={this.handleClick} />
	));
	return (
	<div id="drum-machine">
	<PadBank>{drumPads}</PadBank>
	<InterfaceBank>
	<Display display={this.state.display} />
	</InterfaceBank>
	</div>
	);
	}
	}

	ReactDOM.render(<DrumMachine />, document.getElementById("root"));
	<script src="https://unpkg.com/react@16/umd/react.development.js"></script>
	<script src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script>
	$background: #092834;
	$borders: #FE2712;
	$root: #F0F7D4;
	$pad: #347B98;
	$active: #B2D732;


	* {
	box-sizing: border-box;
	margin: 0px;
	font-family: sans-serif;
	}

	#root {
	display: grid;
	justify-items: center;
	align-content: center;
	height: 100vh;
	background-color: $root;
	}

	#drum-machine {
	background-color: $background;
	width: 80%;
	height: 400px;
	border: 5px solid $borders;
	display: grid;
	grid-template-columns: 2fr 1fr;
	grid-template-rows: 100%;
	align-content: center;
	justify-items: center;
	}

	.drum-pad, .drum-pad-active {
	border: none;
	padding: 20px;
	border-radius: 5px;
	height: 100%;
	font-weight: bold;
	font-size: 2em;
	display: grid;
	justify-content: center;
	align-items: center;
	user-select: none;
	}

	.drum-pad {
	background-color: $pad;
	}

	.drum-pad-active {
	background-color: $active;
	}

	#display {
	background-color: $pad;
	height: 50px;
	width: 90%;
	display: grid;
	justify-content: center;
	align-items: center;
	}

	#container-bank, #container-interface {
	width: 100%;
	display: grid;
	}

	#container-bank {
	grid-template-columns: 30% 30% 30%;
	grid-template-rows: 30% 30% 30%;
	justify-content: center;
	align-content: center;
	grid-gap: 10px 10px;
	}

	#container-interface {

	grid-template-columns: 100%;
	justify-items: center;
	align-content: center;
	}