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Sep 28, 2021
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add a demo #41

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Update README.md
siyuan25 Sep 28, 2021
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25 changes: 25 additions & 0 deletions JS-Day/Playing with Variables/index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Scoped CSS Variables and JS</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<h2>Update CSS Variables with <span class='hl'>JS</span></h2>

<div class="controls">
<label for="spacing">Spacing:</label>
<input id="spacing" type="range" name="spacing" min="10" max="200" value="10" data-sizing="px">

<label for="blur">Blur:</label>
<input id="blur" type="range" name="blur" min="0" max="25" value="10" data-sizing="px">

<label for="base">Base Color</label>
<input id="base" type="color" name="base" value="#ffc600">
</div>

<img src="https://source.unsplash.com/7bwQXzbF6KE/800x500" alt="nice">
</body>
<script src="script.js"></script>
</html>
22 changes: 22 additions & 0 deletions JS-Day/Playing with Variables/script.js
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//select all inputs which are in .controls class
const inputs = document.querySelectorAll('.controls input');

function handleUpdate() {
//dataset will push everything that has data 'dash' (data-xxx) on
//that element and put into object for you.
//if we don't put the fallback '', when we reach the attribute
//that has no data-sizing, we will push undefined!
const suffix = this.dataset.sizing || '';
// console.log(suffix);
// this line will print HTML name attribute for that specific element
// console.log(this.name)
document.documentElement.style.setProperty(`--${this.name}`, this.value + suffix)


}

inputs.forEach((input) => input.addEventListener('change', handleUpdate));
inputs.forEach((input) => input.addEventListener('mousemove', handleUpdate));
38 changes: 38 additions & 0 deletions JS-Day/Playing with Variables/style.css
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:root {
--base: #ffc600;
--spacing: 10px;
--blur: 10px;
}

img {
background: var(--base);
padding: var(--spacing);
filter: blur(var(--blur));
}

/*Now, changing color for the JS span*/
.hl {
color: var(--base);
}


/*
misc styles, nothing to do with CSS variables
*/

body {
text-align: center;
background: #193549;
color: white;
font-family: 'helvetica neue', sans-serif;
font-weight: 100;
font-size: 50px;
}

.controls {
margin-bottom: 50px;
}

input {
width: 100px;
}
1 change: 1 addition & 0 deletions README.md
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[2. ModalBox 💬](https://github.com/cheatsheet1999/FrontEndCollection/issues/23)
[3. Drum Kit 🥁](https://github.com/cheatsheet1999/FrontEndCollection/tree/main/JS-Day/DrumKit)
[4. Mini Clock 🕑](https://github.com/cheatsheet1999/FrontEndCollection/tree/main/JS-Day/Mini%20Clock)
[5. Playing with Variables 🎩](https://github.com/siyuan25/FrontEndCollection/tree/main/JS-Day/Playing%20with%20Variables)

## Deep Dive in Javascript
[_Learn More on BFE.dev_](https://bigfrontend.dev/)
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