Pen Settings

HTML

CSS

CSS Base

Vendor Prefixing

Add External Stylesheets/Pens

Any URL's added here will be added as <link>s in order, and before the CSS in the editor. You can use the CSS from another Pen by using it's URL and the proper URL extention.

+ add another resource

JavaScript

Babel includes JSX processing.

Add External Scripts/Pens

Any URL's added here will be added as <script>s in order, and run before the JavaScript in the editor. You can use the URL of any other Pen and it will include the JavaScript from that Pen.

+ add another resource

Packages

Add Packages

Search for and use JavaScript packages from npm here. By selecting a package, an import statement will be added to the top of the JavaScript editor for this package.

Behavior

Save Automatically?

If active, Pens will autosave every 30 seconds after being saved once.

Auto-Updating Preview

If enabled, the preview panel updates automatically as you code. If disabled, use the "Run" button to update.

Format on Save

If enabled, your code will be formatted when you actively save your Pen. Note: your code becomes un-folded during formatting.

Editor Settings

Code Indentation

Want to change your Syntax Highlighting theme, Fonts and more?

Visit your global Editor Settings.

HTML

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

              
            
!

CSS

              
                $light: #fff;
$dark: #222;
$blue: #2196f3;
$red: #fb3838;

body {
	box-sizing: border-box;
	height: 100%;
}

/* Form
----------------------------*/
form {
	overflow: hidden;
	width: 300px;
	margin: 1em auto;
	select,
	input {
		font-weight: 500;
		font-size: 1em;
		line-height: 1em;
		width: calc(100% / 3 - 0.4em);
		height: 2.5em;
		float: left;
		padding: 0.5em;
		margin: 0 0.2em;
		border: 1px solid lighten($dark, 80%);
		border-width: 0 0 2px 0;
		background: transparent;
		color: $dark;
		outline: none;
		transition: all 500ms ease-in-out;
		&:hover,
		&:focus {
			cursor: pointer;
			outline: none;
			transition: all 500ms ease-in-out;
		}
	}
	input[type="submit"] {
		border: 1px solid $blue;
		background: $blue;
		color: $light;
		&:hover,
		&:focus {
			border-color: lighten($blue, 20%);
			background: lighten($blue, 20%);
		}
	}
	option {
		color: $dark;
	}
	option:disabled {
		color: lighten($dark, 60%);
	}
}

/* Grid
----------------------------*/
%equal-heights {
	display: flex;
	flex-wrap: wrap;
}
.boxes {
	@extend %equal-heights;
}
.box {
	margin:1em 0.5em;
	width: calc(100% / 4 - 1em);
	@media (max-width: 960px) {
		width: calc(100% / 3 - 1em);
	}
	@media (max-width: 767px) {
		width: calc(100% / 2 - 1em);
	}
	@media (max-width: 600px) {
		width: calc(100% - 1em);
	}
}

/* Thumbs
----------------------------*/
.thumb {
	padding: 1em;
	text-align: center;
	position: relative;
	width: calc(100% - 2em);
	max-width: 12em;
	margin: auto;
	border: 1px solid darken($light, 10%);
	background: $light;
	box-shadow: 0px 4px 4px -4px $dark;
	border-radius: 4px;
	transition: background 800ms ease;
	opacity: 1;
	transform: scale(1);
	animation: show 500ms 1 ease-in-out;
	@keyframes show {
		from {
			transform:scale(0.5);
			opacity: 0;
		}
	}
	img {
		max-width: 100%;
		padding: 1em;
		width: calc(100% - 2em);
	}
	.img-loading {
    width: 100%;
    margin: auto;
    text-align:center;
    position:relative;
    color: $blue;
    div{
      display: block;
      width: 100%;
      min-height: 190px;
      margin: auto;
      background: url(data:image/svg+xml;base64,<?xml version="1.0" encoding="UTF-8" standalone="no"?><!-- Generator: Gravit.io --><svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" style="isolation:isolate" viewBox="0 0 84 150" width="84pt" height="150pt"><mask id="_mask_xufmVbcGXQQ67q20xJofSOfuCj7MrVwb" x="-200%" y="-200%" width="400%" height="400%"><rect x="-200%" y="-200%" width="400%" height="400%" style="fill:white;"/><line x1="8.573" y1="17.5" x2="74.573" y2="17.5" fill="black" stroke="none"/></mask><line x1="8.573" y1="17.5" x2="74.573" y2="17.5" mask="url(#_mask_xufmVbcGXQQ67q20xJofSOfuCj7MrVwb)" vector-effect="non-scaling-stroke" stroke-width="10" stroke="rgb(34,34,34)" stroke-linejoin="miter" stroke-linecap="round" stroke-miterlimit="4"/><mask id="_mask_klHQNNClY4jTyXmuDtpEjvrt9iORqond" x="-200%" y="-200%" width="400%" height="400%"><rect x="-200%" y="-200%" width="400%" height="400%" style="fill:white;"/><path d=" M 8.573 48.033 L 74.573 48.033 M 8.573 74.665 L 74.573 74.665 M 8.573 99.965 L 74.573 99.965 M 8.573 124 L 74.573 124 M 8.573 20 L 8.573 129 M 30.573 20 L 30.573 129 M 52.573 20 L 52.573 129 M 74.573 20 L 74.573 129" fill-rule="evenodd" fill="black" stroke="none"/></mask><path d=" M 8.573 48.033 L 74.573 48.033 M 8.573 74.665 L 74.573 74.665 M 8.573 99.965 L 74.573 99.965 M 8.573 124 L 74.573 124 M 8.573 20 L 8.573 129 M 30.573 20 L 30.573 129 M 52.573 20 L 52.573 129 M 74.573 20 L 74.573 129" fill-rule="evenodd" fill="rgb(0,0,0)" mask="url(#_mask_klHQNNClY4jTyXmuDtpEjvrt9iORqond)" vector-effect="non-scaling-stroke" stroke-width="4" stroke="rgb(34,34,34)" stroke-linejoin="miter" stroke-linecap="round" stroke-miterlimit="4"/><path d=" M 8.573 48.033 L 74.573 48.033 M 8.573 74.665 L 74.573 74.665 M 8.573 99.965 L 74.573 99.965 M 8.573 124 L 74.573 124 M 8.573 20 L 8.573 129 M 30.573 20 L 30.573 129 M 52.573 20 L 52.573 129 M 74.573 20 L 74.573 129" fill-rule="evenodd" fill="rgb(0,0,0)"/><path d=" M 49.573 8 C 49.573 6.344 50.917 5 52.573 5 C 54.229 5 55.573 6.344 55.573 8 C 55.573 9.656 54.229 11 52.573 11 C 50.917 11 49.573 9.656 49.573 8 Z  M 27.573 8 C 27.573 6.344 28.917 5 30.573 5 C 32.229 5 33.573 6.344 33.573 8 C 33.573 9.656 32.229 11 30.573 11 C 28.917 11 27.573 9.656 27.573 8 Z  M 6.073 8 C 6.073 6.344 7.417 5 9.073 5 C 10.729 5 12.073 6.344 12.073 8 C 12.073 9.656 10.729 11 9.073 11 C 7.417 11 6.073 9.656 6.073 8 Z  M 71.573 8 C 71.573 6.344 72.917 5 74.573 5 C 76.229 5 77.573 6.344 77.573 8 C 77.573 9.656 76.229 11 74.573 11 C 72.917 11 71.573 9.656 71.573 8 Z " fill-rule="evenodd" fill="none" vector-effect="non-scaling-stroke" stroke-width="1" stroke="rgb(0,0,0)" stroke-linejoin="miter" stroke-linecap="butt" stroke-miterlimit="4"/><path d=" M 10.698 139.279 L 10.698 139.279 L 10.698 139.279 Q 10.698 140.944 10.173 141.766 L 10.173 141.766 L 10.173 141.766 Q 9.647 142.588 8.566 142.588 L 8.566 142.588 L 8.566 142.588 Q 7.529 142.588 6.989 141.746 L 6.989 141.746 L 6.989 141.746 Q 6.448 140.905 6.448 139.279 L 6.448 139.279 L 6.448 139.279 Q 6.448 137.6 6.971 136.787 L 6.971 136.787 L 6.971 136.787 Q 7.494 135.974 8.566 135.974 L 8.566 135.974 L 8.566 135.974 Q 9.612 135.974 10.155 136.822 L 10.155 136.822 L 10.155 136.822 Q 10.698 137.67 10.698 139.279 Z  M 7.187 139.279 L 7.187 139.279 L 7.187 139.279 Q 7.187 140.681 7.516 141.32 L 7.516 141.32 L 7.516 141.32 Q 7.846 141.959 8.566 141.959 L 8.566 141.959 L 8.566 141.959 Q 9.296 141.959 9.623 141.311 L 9.623 141.311 L 9.623 141.311 Q 9.951 140.663 9.951 139.279 L 9.951 139.279 L 9.951 139.279 Q 9.951 137.895 9.623 137.251 L 9.623 137.251 L 9.623 137.251 Q 9.296 136.607 8.566 136.607 L 8.566 136.607 L 8.566 136.607 Q 7.846 136.607 7.516 137.242 L 7.516 137.242 L 7.516 137.242 Q 7.187 137.877 7.187 139.279 Z  M 32.698 139.279 L 32.698 139.279 L 32.698 139.279 Q 32.698 140.944 32.173 141.766 L 32.173 141.766 L 32.173 141.766 Q 31.647 142.588 30.566 142.588 L 30.566 142.588 L 30.566 142.588 Q 29.529 142.588 28.989 141.746 L 28.989 141.746 L 28.989 141.746 Q 28.448 140.905 28.448 139.279 L 28.448 139.279 L 28.448 139.279 Q 28.448 137.6 28.971 136.787 L 28.971 136.787 L 28.971 136.787 Q 29.494 135.974 30.566 135.974 L 30.566 135.974 L 30.566 135.974 Q 31.612 135.974 32.155 136.822 L 32.155 136.822 L 32.155 136.822 Q 32.698 137.67 32.698 139.279 Z  M 29.187 139.279 L 29.187 139.279 L 29.187 139.279 Q 29.187 140.681 29.516 141.32 L 29.516 141.32 L 29.516 141.32 Q 29.846 141.959 30.566 141.959 L 30.566 141.959 L 30.566 141.959 Q 31.296 141.959 31.623 141.311 L 31.623 141.311 L 31.623 141.311 Q 31.951 140.663 31.951 139.279 L 31.951 139.279 L 31.951 139.279 Q 31.951 137.895 31.623 137.251 L 31.623 137.251 L 31.623 137.251 Q 31.296 136.607 30.566 136.607 L 30.566 136.607 L 30.566 136.607 Q 29.846 136.607 29.516 137.242 L 29.516 137.242 L 29.516 137.242 Q 29.187 137.877 29.187 139.279 Z  M 54.698 139.279 L 54.698 139.279 L 54.698 139.279 Q 54.698 140.944 54.173 141.766 L 54.173 141.766 L 54.173 141.766 Q 53.647 142.588 52.566 142.588 L 52.566 142.588 L 52.566 142.588 Q 51.529 142.588 50.989 141.746 L 50.989 141.746 L 50.989 141.746 Q 50.448 140.905 50.448 139.279 L 50.448 139.279 L 50.448 139.279 Q 50.448 137.6 50.971 136.787 L 50.971 136.787 L 50.971 136.787 Q 51.494 135.974 52.566 135.974 L 52.566 135.974 L 52.566 135.974 Q 53.612 135.974 54.155 136.822 L 54.155 136.822 L 54.155 136.822 Q 54.698 137.67 54.698 139.279 Z  M 51.187 139.279 L 51.187 139.279 L 51.187 139.279 Q 51.187 140.681 51.516 141.32 L 51.516 141.32 L 51.516 141.32 Q 51.846 141.959 52.566 141.959 L 52.566 141.959 L 52.566 141.959 Q 53.296 141.959 53.623 141.311 L 53.623 141.311 L 53.623 141.311 Q 53.951 140.663 53.951 139.279 L 53.951 139.279 L 53.951 139.279 Q 53.951 137.895 53.623 137.251 L 53.623 137.251 L 53.623 137.251 Q 53.296 136.607 52.566 136.607 L 52.566 136.607 L 52.566 136.607 Q 51.846 136.607 51.516 137.242 L 51.516 137.242 L 51.516 137.242 Q 51.187 137.877 51.187 139.279 Z  M 76.698 139.279 L 76.698 139.279 L 76.698 139.279 Q 76.698 140.944 76.173 141.766 L 76.173 141.766 L 76.173 141.766 Q 75.647 142.588 74.566 142.588 L 74.566 142.588 L 74.566 142.588 Q 73.529 142.588 72.989 141.746 L 72.989 141.746 L 72.989 141.746 Q 72.448 140.905 72.448 139.279 L 72.448 139.279 L 72.448 139.279 Q 72.448 137.6 72.971 136.787 L 72.971 136.787 L 72.971 136.787 Q 73.494 135.974 74.566 135.974 L 74.566 135.974 L 74.566 135.974 Q 75.612 135.974 76.155 136.822 L 76.155 136.822 L 76.155 136.822 Q 76.698 137.67 76.698 139.279 Z  M 73.187 139.279 L 73.187 139.279 L 73.187 139.279 Q 73.187 140.681 73.516 141.32 L 73.516 141.32 L 73.516 141.32 Q 73.846 141.959 74.566 141.959 L 74.566 141.959 L 74.566 141.959 Q 75.296 141.959 75.623 141.311 L 75.623 141.311 L 75.623 141.311 Q 75.951 140.663 75.951 139.279 L 75.951 139.279 L 75.951 139.279 Q 75.951 137.895 75.623 137.251 L 75.623 137.251 L 75.623 137.251 Q 75.296 136.607 74.566 136.607 L 74.566 136.607 L 74.566 136.607 Q 73.846 136.607 73.516 137.242 L 73.516 137.242 L 73.516 137.242 Q 73.187 137.877 73.187 139.279 Z " fill-rule="evenodd" fill="rgb(0,0,0)"/></svg>)
        no-repeat center center transparent;
      animation: flash 800ms infinite ease-in-out;
      @keyframes flash {
        from {
          opacity: 0;
        }
      }
    }
  }
	figcaption {
		margin-top: 0.2em;
		font-size: 12px;
		font-weight: 700;
		color: darken($light, 30%);
	}
	&.hide {
		opacity: 0;
		transform: scale(0.2);
		animation: hideElement 200ms 1 ease-in-out;
		@keyframes hideElement {
			from {
				transform:scale(1);
				opacity: 1;
			}
		}
	}
	.img-close {
		position: absolute;
		top: -8px;
		right: -8px;
		width: 30px;
		height: 30px;
		line-height: 1.2;
		font-size: 25px;
		font-weight: bold;
		border-radius: 100%;
		cursor: pointer;
		background: $red;
		border: 1px solid darken($red, 20%);
		color: $light;
	}
}
.exists{
	border:1px solid $red;
	background:lighten($red,20%);
	transition: background 800ms ease;
	figcaption{
		color:$light;
	}
}
/* layout
----------------------------*/
.header {
	text-align: center;
	h3 {
		margin: 0;
		font-size: 2em;
		color: darken($light, 50%);
	}
}


              
            
!

JS

              
                const {useState, useEffect, Fragment } = React;

const assetsUrl = "http://ukulala.surge.sh/chords";
/**
 * Storage theme settings
 *
 * set Storage.val = {color: 'blue'}
 * get Storage.val
 */
const Storage = {
	get val() {
		this.data = window.localStorage.getItem("demo_data");
		return JSON.parse(this.data);
	},
	set val(value) {
		this.data = JSON.stringify(value);
		window.localStorage.setItem("demo_data", this.data);
	}
};

// check array duplicates
const hasDuplicates = array => {
	return (new Set(array)).size !== array.length;
}


/* Notes
-----------------------------*/
const Notes = {
	C: "Do",
	Db: "Reb/Do#",
	D: "Re",
	Eb: "Mib/Re#",
	E: "Mi",
	F: "Fa",
	Gb: "Solb/Fa#",
	G: "Sol",
	Ab: "Lab/Sol#",
	A: "La",
	Bb: "Sib/La#",
	B: "Si"
};
/* Tonalityes
-----------------------------*/
const Tonalityes = {
	"": "",
	m: "m",
	_: "+",
	"5": "5",
	"6": "6",
	maj7: "maj7",
	m7: "m7",
	m6: "m6",
	m7_b5_: "m7(b5)",
	dim7: "dim7",
	"7": "7",
	"9": "9",
	"7_b9_": "7(b9)",
	"7__5_": "7(#5)"
};
/* Simple forms component
-----------------------------*/
const Form = (props) => <form onSubmit={props.fn}>{props.children}</form>;
const Select = (props) => {
	let data = props.data;
	let notes = {};
	if (props.sort) notes = Object.entries(data).sort();
	else notes = Object.entries(data);
	return (
		<select onChange={props.fn}>
			{notes.map(([key, value]) => (
				<option key={key} value={key}>
					{value}
				</option>
			))}
		</select>
	);
};
const Submit = (props) => <input type="submit" value={props.val || "Get"} />;

/* Columns
-----------------------------*/
const Boxes = (props) => <div className="boxes">{props.children}</div>;
const Box = (props) => <div className="box">{props.children}</div>;
const ImgLoader = () => <div className="img-loading"><div></div></div>

/* Image
-----------------------------*/
const Image = (props) => {
	const [src, setSrc] = useState("");
	// use timeout and show image
	useEffect(() => {
		let timerid = false;
		if (timerid) {
			clearTimeout(timerid);
		}
		timerid = setTimeout(() => {
			setSrc(`${assetsUrl}/${props.data}.svg`);
		}, 100);
	}, [props.data]);

	return (
		<figure className={`thumb ${props.data}`}>
			<span className="img-close" onClick={props.fn}>&times;</span>
			{/* check if exists src */}
			{src ? <img src={src} /> : <ImgLoader/>}
			<figcaption>
        {props.data.substring(0, 2).charAt(1) === "b"
          ? Notes[props.data.substring(0, 2)] +
            " " +
            Tonalityes[props.data.substring(2, props.data.length)]
          : Notes[props.data.substring(0, 1)] +
            " " +
            Tonalityes[props.data.substring(1, props.data.length)]}
			</figcaption>
		</figure>
	);
};

const Header = (props) => (
	<header className="header">
		<h3>{props.children}</h3>
	</header>
);

const App = () => {
	// last array
	let lastSaved = Storage.val ? Storage.val : ["C"];
	// data of chords
	const [data, setData] = useState(["C"]);

	// note & tonality
	const [note, setNote] = useState("C");
	const [tonality, setTonality] = useState("");

	// on init get last data saved
	useEffect(() => setData(lastSaved), []);
	
	// Add submit
	const handleSubmit = (e) => {
    e.preventDefault();
    let arr = note + tonality;
    let newArr = [...data, arr];
    if (hasDuplicates(newArr)) {
      // if chord exists show red color
      let img = document.querySelector(`.${arr}`);
      img.classList.add("exists");
      let w = setTimeout(() => {
        img.classList.remove("exists");
        clearTimeout(w);
      }, 800);
    }
    // update array of unique elements
    setData([...new Set(newArr)]);
    Storage.val = [...new Set(newArr)];
		return false;
	};

	// delete data
	const removeData = (evt, index) => {
		let element = evt.target.parentNode;
		element.classList.add("hide");

		let w = setTimeout(() => {
			// remove array by index
			let arr = [...data];
			arr.splice(index, 1);
			// remove duplicates
			let savedArr = [...new Set(arr)];
			// update
			setData(savedArr);
			// storage saved
			Storage.val = savedArr;
			clearTimeout(w);
		}, 500);

	};

	return (
		<Fragment>
			<Header>Ukelele Componser</Header>
			<Form fn={handleSubmit}>
				<Select 
					sort={false} 
					fn={(e) => setNote(e.target.value)} 
					data={Notes} />
				<Select
					sort={true}
					fn={(e) => setTonality(e.target.value)}
					data={Tonalityes}
				/>
				<Submit val="+" />
			</Form>
			<Boxes>
				{data.map((item, index) => (
					<Box key={index}>
						<Image 
							fn={(evt) => removeData(evt, index)} 
							data={item} />
					</Box>
				))}
			</Boxes>
		</Fragment>
	);
};

ReactDOM.render(<App />, window.root);

              
            
!
999px

Console