What is the most efficient method for generating random dark colors using javascript code?

Question

What is the most efficient method for generating random dark colors using javascript code?

Looking for a function that specifically returns dark colors.

Although I can generate random colors with the code below, how do I make sure it only retrieves dark ones?

document.getElementById('mydiv').style.backgroundColor = '#' + Math.floor(Math.random() * 16777215).toString(16);

div {
  height: 100px;
  width: 100%;
}

<div id="mydiv"></div>

If not possible, is there a way to create an array of dark colors and select from that instead?

javascript

Answer 1

Answer №1

Personally, I find the HSL color system (Hue, Saturation, Light) to be more user-friendly.

Here is a simple example code snippet:

const mydiv = document.getElementById('mydiv')

document.querySelector('button').onclick=_=>
  {
  let colorH = Math.floor(Math.random() *359)
    , colorS = Math.floor(Math.random() *40) +60
    , colorL = Math.floor(Math.random() *15) +7  // dark colors to adjust
    ;
  mydiv.style.setProperty('--colorBG', `hsl(${colorH}, ${colorS}%, ${colorL}%)`)
  }

#mydiv {
  --colorBG: hsl(0, 100%, 15%);  /* 0..359 */
  display: block;
  height: 100px;
  width:100px;
  background-color: var(--colorBG);
  }
* {margin: 1em;}

<div id="mydiv"> </div>

<button>Random color</button>

Answer 2

Personally, I find the HSL color system (Hue, Saturation, Light) to be more user-friendly.

Here is a simple example code snippet:

const mydiv = document.getElementById('mydiv')

document.querySelector('button').onclick=_=>
  {
  let colorH = Math.floor(Math.random() *359)
    , colorS = Math.floor(Math.random() *40) +60
    , colorL = Math.floor(Math.random() *15) +7  // dark colors to adjust
    ;
  mydiv.style.setProperty('--colorBG', `hsl(${colorH}, ${colorS}%, ${colorL}%)`)
  }

#mydiv {
  --colorBG: hsl(0, 100%, 15%);  /* 0..359 */
  display: block;
  height: 100px;
  width:100px;
  background-color: var(--colorBG);
  }
* {margin: 1em;}

<div id="mydiv"> </div>

<button>Random color</button>

Answer 3

Answer №2

The depth of darkness increases with lower levels, reaching full range at 256.

lvl = 128;
color = Math.floor(Math.random()*lvl)<<16 | Math.floor(Math.random()*lvl)<<8 | Math.floor(Math.random()*lvl);
document.getElementById('mydiv').style.backgroundColor = '#' + color.toString(16).padStart(6, "0");

div { height: 100px; width:100%; }

<div id="mydiv"/>

Answer 4

The depth of darkness increases with lower levels, reaching full range at 256.

lvl = 128;
color = Math.floor(Math.random()*lvl)<<16 | Math.floor(Math.random()*lvl)<<8 | Math.floor(Math.random()*lvl);
document.getElementById('mydiv').style.backgroundColor = '#' + color.toString(16).padStart(6, "0");

div { height: 100px; width:100%; }

<div id="mydiv"/>

Answer 5

Answer №3

When it comes to colors, they are essentially mixtures of red, green, and blue with values ranging from 0-255 for each. The darkest version of a color is represented by 0 (which is basically black), and the lightest is represented by 255 (white).

If you're aiming for a "dark" color, stick to the lower half of the 0-255 range and choose values between 0 and 127. To convert these values into hex colors, simply use .toString(16). Repeat this process three times - once for R, once for G, and once for B.

To ensure that each base 16 value between 0-127 has a leading 0 when necessary, just add a "0" at the beginning and then use slice to extract the last two characters, omitting the unnecessary "0".

Selecting colors randomly doesn't require much explanation.

document.getElementById("dark").style.background = "#" + ("0" + rando(127).toString(16)).slice(-2) + ("0" + rando(127).toString(16)).slice(-2) + ("0" + rando(127).toString(16)).slice(-2);
document.getElementById("darkFromPool").style.background = rando(["black", "darkgreen", "darkred"]).value;

div { height: 50px; margin: 10px 0px 30px 0px; border-radius: 4px; }

<script src="https://randojs.com/1.0.0.js"></script>

Random dark: <div id="dark"></div>
Random dark from pool: <div id="darkFromPool"></div>

This code simplifies randomness using randojs.com to enhance readability. If you intend to utilize this code, ensure that the following script tag is included in the head section of your HTML document:

<script src="https://randojs.com/1.0.0.js"></script>

Answer 6

When it comes to colors, they are essentially mixtures of red, green, and blue with values ranging from 0-255 for each. The darkest version of a color is represented by 0 (which is basically black), and the lightest is represented by 255 (white).

If you're aiming for a "dark" color, stick to the lower half of the 0-255 range and choose values between 0 and 127. To convert these values into hex colors, simply use .toString(16). Repeat this process three times - once for R, once for G, and once for B.

To ensure that each base 16 value between 0-127 has a leading 0 when necessary, just add a "0" at the beginning and then use slice to extract the last two characters, omitting the unnecessary "0".

Selecting colors randomly doesn't require much explanation.

document.getElementById("dark").style.background = "#" + ("0" + rando(127).toString(16)).slice(-2) + ("0" + rando(127).toString(16)).slice(-2) + ("0" + rando(127).toString(16)).slice(-2);
document.getElementById("darkFromPool").style.background = rando(["black", "darkgreen", "darkred"]).value;

div { height: 50px; margin: 10px 0px 30px 0px; border-radius: 4px; }

<script src="https://randojs.com/1.0.0.js"></script>

Random dark: <div id="dark"></div>
Random dark from pool: <div id="darkFromPool"></div>

This code simplifies randomness using randojs.com to enhance readability. If you intend to utilize this code, ensure that the following script tag is included in the head section of your HTML document:

<script src="https://randojs.com/1.0.0.js"></script>

Answer 7

Answer №4

Discover how to create random color combinations using HTML, CSS, and Javascript with the code snippet below:

const setBg = () => {
  const randomColor = Math.floor(Math.random()*16777215).toString(16);
  document.body.style.backgroundColor = "#" + randomColor;
  color.textContent = "#" + randomColor;
}

genNew.addEventListener("click", setBg);
setBg();

body {
  height: 100vh;
  margin: 0;
  padding: 1rem;
  display: grid;
  place-items: center;
  font-family: system-ui;
}
h1 {
  background: white;
  padding: 1rem 2rem;
  text-align: center;
}
span {
  display: block;
  padding: 1rem;
  font-size: 1rem;
  font-weight: normal;
  font-family: monospace;
  text-transform: uppercase;
}

<h1>
  <button id="genNew">Generate New Random Color</button>
  <span id="color"></span>
</h1>

Answer 8

Discover how to create random color combinations using HTML, CSS, and Javascript with the code snippet below:

const setBg = () => {
  const randomColor = Math.floor(Math.random()*16777215).toString(16);
  document.body.style.backgroundColor = "#" + randomColor;
  color.textContent = "#" + randomColor;
}

genNew.addEventListener("click", setBg);
setBg();

body {
  height: 100vh;
  margin: 0;
  padding: 1rem;
  display: grid;
  place-items: center;
  font-family: system-ui;
}
h1 {
  background: white;
  padding: 1rem 2rem;
  text-align: center;
}
span {
  display: block;
  padding: 1rem;
  font-size: 1rem;
  font-weight: normal;
  font-family: monospace;
  text-transform: uppercase;
}

<h1>
  <button id="genNew">Generate New Random Color</button>
  <span id="color"></span>
</h1>

What is the most efficient method for generating random dark colors using javascript code?

Answer №1

Answer №2

Answer №3

Answer №4

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