Is there a built-in function that would convert a color by name into its hex representation? Like I want to pass 'white' and receive '#FFFFFF'. I really want to avoid coding all hundred if's myself :)
16 Answers
@dlauzon suggested I convert my comment into an answer. Thanks for suggesting! Here it is :)
function standardize_color(str){
var ctx = document.createElement('canvas').getContext('2d');
ctx.fillStyle = str;
return ctx.fillStyle;
}
function standardize_color(str){
var ctx = document.createElement("canvas").getContext("2d");
ctx.fillStyle = str;
return ctx.fillStyle;
}
document.getElementById("myspan1").innerHTML = standardize_color("red");
document.getElementById("myspan2").innerHTML = standardize_color("PeachPuff");
document.getElementById("myspan3").innerHTML = standardize_color("PaleGoldenRod");
document.getElementById("myspan4").innerHTML = standardize_color("RGB(123,234,142)");
document.getElementById("myspan5").innerHTML = standardize_color("HSL(284,6%,49%)");span { font-weight:800; }The color named "Red" has a code of: <span id="myspan1">(requires js)</span>.<br>
...and color "PeachPuff"'s code is: <span id="myspan2">(requires js)</span>.<br>
...and "PaleGoldenRod" is: <span id="myspan3">(requires js)</span>.<br><br>
It works with "RGB(123,234,142)" too: <span id="myspan4">(needs js)</span>
and therefore with: "HSL(284,6%,49%)", which is: <span id="myspan5">(requires js)
</span>. Handy!Download & include the w3color.js from w3school.
then in your script you can use any of the following functions:
let c = w3color("violet");
c.darker(n)
c.desaturate(n)
c.isDark(n)
c.lighter(n)
c.saturate(n)
c.toCmyk()
c.toCmykString()
c.toCmykStringDecimal()
c.toHexString()
c.toHsl()
c.toHslString()
c.toHslStringDecimal()
c.toHslaString()
c.toHwb()
c.toHwbString()
c.toHwbStringDecimal()
c.toHwbaString()
c.toName()
c.toNcol()
c.toNcolString()
c.toNcolStringDecimal()
c.toNcolaString()
c.toRgb()
c.toRgbString()
c.toRgbaString()
Run the snippet to see how easily "any" valid CSS color (HSL, names, hex, system colors*, etc.) can be converted to R/G/B values using any element you happen to have laying around.
*Enter a value of background and you'll get your Windows Desktop background color (in Firefox, anyways).
go();
function go() {
clr.style.backgroundColor = document.getElementById('txt').value;
document.getElementById('rgb').innerHTML = window.getComputedStyle(clr).backgroundColor;
}* { margin:0; box-sizing:border-box; font-family:verdana; overflow:hidden; }
#txt,#rgb,#clr { height:30vh; width:97vw; padding:5vmin; margin:2vmin; font-size:13vh; border:1vmin solid; text-align:center; vertical-align:middle;}
#txt{margin-bottom:0;}<input type='text' id='txt' onkeyup='go()' value='chartreuse' placeholder='Enter any css color . . .' autofocus>
<div id='clr'></div>
<div id='rgb'></div>The solution from Ties converted to TypeScript:
export const getHexColorFromLiteral = (
colorStr:
| 'aliceblue'
| 'antiquewhite'
| 'aqua'
| 'aquamarine'
| 'azure'
| 'beige'
| 'bisque'
| 'black'
| 'blanchedalmond'
| 'blue'
| 'blueviolet'
| 'brown'
| 'burlywood'
| 'cadetblue'
| 'chartreuse'
| 'chocolate'
| 'coral'
| 'cornflowerblue'
| 'cornsilk'
| 'crimson'
| 'cyan'
| 'darkblue'
| 'darkcyan'
| 'darkgoldenrod'
| 'darkgray'
| 'darkgreen'
| 'darkkhaki'
| 'darkmagenta'
| 'darkolivegreen'
| 'darkorange'
| 'darkorchid'
| 'darkred'
| 'darksalmon'
| 'darkseagreen'
| 'darkslateblue'
| 'darkslategray'
| 'darkturquoise'
| 'darkviolet'
| 'deeppink'
| 'deepskyblue'
| 'dimgray'
| 'dodgerblue'
| 'firebrick'
| 'floralwhite'
| 'forestgreen'
| 'fuchsia'
| 'gainsboro'
| 'ghostwhite'
| 'gold'
| 'goldenrod'
| 'gray'
| 'green'
| 'greenyellow'
| 'honeydew'
| 'hotpink'
| 'indianred'
| 'indigo'
| 'ivory'
| 'khaki'
| 'lavender'
| 'lavenderblush'
| 'lawngreen'
| 'lemonchiffon'
| 'lightblue'
| 'lightcoral'
| 'lightcyan'
| 'lightgoldenrodyellow'
| 'lightgray'
| 'lightgreen'
| 'lightpink'
| 'lightsalmon'
| 'lightseagreen'
| 'lightskyblue'
| 'lightslategray'
| 'lightsteelblue'
| 'lightyellow'
| 'lime'
| 'limegreen'
| 'linen'
| 'magenta'
| 'maroon'
| 'mediumaquamarine'
| 'mediumblue'
| 'mediumorchid'
| 'mediumpurple'
| 'mediumseagreen'
| 'mediumslateblue'
| 'mediumspringgreen'
| 'mediumturquoise'
| 'mediumvioletred'
| 'midnightblue'
| 'mintcream'
| 'mistyrose'
| 'moccasin'
| 'navajowhite'
| 'navy'
| 'oldlace'
| 'olive'
| 'olivedrab'
| 'orange'
| 'orangered'
| 'orchid'
| 'palegoldenrod'
| 'palegreen'
| 'paleturquoise'
| 'palevioletred'
| 'papayawhip'
| 'peachpuff'
| 'peru'
| 'pink'
| 'plum'
| 'powderblue'
| 'purple'
| 'rebeccapurple'
| 'red'
| 'rosybrown'
| 'royalblue'
| 'saddlebrown'
| 'salmon'
| 'sandybrown'
| 'seagreen'
| 'seashell'
| 'sienna'
| 'silver'
| 'skyblue'
| 'slateblue'
| 'slategray'
| 'snow'
| 'springgreen'
| 'steelblue'
| 'tan'
| 'teal'
| 'thistle'
| 'tomato'
| 'turquoise'
| 'violet'
| 'wheat'
| 'white'
| 'whitesmoke'
| 'yellow'
| 'yellowgreen'
) => {
const div = document.createElement('div')
div.style.color = colorStr
document.body.appendChild(div)
const computedColor = window.getComputedStyle(div).color
const matchResult = computedColor.match(/\d+/g)
if (matchResult !== null) {
const colors = matchResult.map((a) => parseInt(a, 10))
document.body.removeChild(div)
return colors.length >= 3
? '#' + ((1 << 24) + (colors[0] << 16) + (colors[1] << 8) + colors[2]).toString(16).substr(1)
: false
}
return false
}
This function request a named color and send return a hexadecimal color value. If the named color not supported (example "whyte") send back black color by default but on consol you can find a warning: Not supported named color: ${namedColor}
const namedColorToHex = namedColor => {
const html = document.querySelector("html");
const originalColor = html.style.color;
html.style.color = namedColor;
const rgbFormatBgColor = window.getComputedStyle(html).color;
if (namedColor !== "black" && rgbFormatBgColor === "rgb(0, 0, 0)") {
console.warn(`Not supported named color: ${namedColor}`);
}
html.style.color = originalColor;
const regEx = /(\d+)/g;
const result = rgbFormatBgColor.match(regEx);
let hexColor = `#`;
result.forEach(value => {
let hex = Number(value).toString(16);
if (hex.length === 1) {
hex = `0${hex}`;
}
hexColor += hex;
});
return hexColor;
};
With Firefox 94 you get the rgb color when formated with a color name. But you have to inject the dummy element at first to the page.
// Vanilla and jQuery
console.clear();
var
colors = ['cyan', 'magenta', 'yellow']
dummy = {},
colorObj = {},
rgbString = '',
rgb2hex = function(rgb) {
rgb = rgb.match(/^rgba?[\s+]?\([\s+]?(\d+)[\s+]?,[\s+]?(\d+)[\s+]?,[\s+]?(\d+)[\s+]?/i);
return (rgb && rgb.length === 4) ? "#" +
("0" + parseInt(rgb[1],10).toString(16)).slice(-2) +
("0" + parseInt(rgb[2],10).toString(16)).slice(-2) +
("0" + parseInt(rgb[3],10).toString(16)).slice(-2) : '';
}
;
$(colors).each(function(i, color) {
dummy = $('<b style="background-color:' + color + '"></b>');
// inject the dummy
$('body').append(dummy);
// get the rgb color
rgbString = dummy.css('background-color');
// build an object with 'color name', 'rgb color' and 'hex color'
colorObj[i] = [color, rgbString, rgb2hex(rgbString)];
// delete the dummy
dummy.remove();
});
console.dir(colorObj);
If you need an array with all 140 color names
colors = [
'aliceblue',
'antiquewhite',
'aqua',
'aquamarine',
'azure',
'beige',
'bisque',
'black',
'blanchedalmond',
'blue',
'blueviolet',
'brown',
'burlywood',
'cadetblue',
'chartreuse',
'chocolate',
'coral',
'cornflowerblue',
'cornsilk',
'crimson',
'cyan',
'darkblue',
'darkcyan',
'darkgoldenrod',
'darkgray',
'darkgreen',
'darkkhaki',
'darkmagenta',
'darkolivegreen',
'darkorange',
'darkorchid',
'darkred',
'darksalmon',
'darkseagreen',
'darkslateblue',
'darkslategray',
'darkturquoise',
'darkviolet',
'deeppink',
'deepskyblue',
'dimgray',
'dodgerblue',
'firebrick',
'floralwhite',
'forestgreen',
'fuchsia',
'gainsboro',
'ghostwhite',
'gold',
'goldenrod',
'gray',
'green',
'greenyellow',
'honeydew',
'hotpink',
'indianred',
'indigo',
'ivory',
'khaki',
'lavender',
'lavenderblush',
'lawngreen',
'lemonchiffon',
'lightblue',
'lightcoral',
'lightcyan',
'lightgoldenrodyellow',
'lightgray',
'lightgreen',
'lightpink',
'lightsalmon',
'lightseagreen',
'lightskyblue',
'lightslategray',
'lightsteelblue',
'lightyellow',
'lime',
'limegreen',
'linen',
'magenta',
'maroon',
'mediumaquamarine',
'mediumblue',
'mediumorchid',
'mediumpurple',
'mediumseagreen',
'mediumslateblue',
'mediumspringgreen',
'mediumturquoise',
'mediumvioletred',
'midnightblue',
'mintcream',
'mistyrose',
'moccasin',
'navajowhite',
'navy',
'oldlace',
'olive',
'olivedrab',
'orange',
'orangered',
'orchid',
'palegoldenrod',
'palegreen',
'paleturquoise',
'palevioletred',
'papayawhip',
'peachpuff',
'peru',
'pink',
'plum',
'powderblue',
'purple',
'red',
'rosybrown',
'royalblue',
'saddlebrown',
'salmon',
'sandybrown',
'seagreen',
'seashell',
'sienna',
'silver',
'skyblue',
'slateblue',
'slategray',
'snow',
'springgreen',
'steelblue',
'tan',
'teal',
'thistle',
'tomato',
'turquoise',
'violet',
'wheat',
'white',
'whitesmoke',
'yellow',
'yellowgreen'
]
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