Using the following jQuery will get the RGB value of an element's background color:
$('#selector').css('backgroundColor');
Is there a way to get the hex value rather than the RGB?
This question is related to
javascript
jquery
colors
hex
rgb
I've created a function that uses readable basic functions and no reg-exps.
The function accepts color in hex, rgb or rgba CSS format and returns hex representation.
EDIT: there was a bug with parsing out rgba() format, fixed...
function getHexColor( color ){
//if color is already in hex, just return it...
if( color.indexOf('#') != -1 ) return color;
//leave only "R,G,B" :
color = color
.replace("rgba", "") //must go BEFORE rgb replace
.replace("rgb", "")
.replace("(", "")
.replace(")", "");
color = color.split(","); // get Array["R","G","B"]
// 0) add leading #
// 1) add leading zero, so we get 0XY or 0X
// 2) append leading zero with parsed out int value of R/G/B
// converted to HEX string representation
// 3) slice out 2 last chars (get last 2 chars) =>
// => we get XY from 0XY and 0X stays the same
return "#"
+ ( '0' + parseInt(color[0], 10).toString(16) ).slice(-2)
+ ( '0' + parseInt(color[1], 10).toString(16) ).slice(-2)
+ ( '0' + parseInt(color[2], 10).toString(16) ).slice(-2);
}
Here is my solution, also does touppercase by the use of an argument and checks for other possible white-spaces and capitalisation in the supplied string.
var a = "rgb(10, 128, 255)";
var b = "rgb( 10, 128, 255)";
var c = "rgb(10, 128, 255 )";
var d = "rgb ( 10, 128, 255 )";
var e = "RGB ( 10, 128, 255 )";
var f = "rgb(10,128,255)";
var g = "rgb(10, 128,)";
var rgbToHex = (function () {
var rx = /^rgb\s*\(\s*(\d+)\s*,\s*(\d+)\s*,\s*(\d+)\s*\)$/i;
function pad(num) {
if (num.length === 1) {
num = "0" + num;
}
return num;
}
return function (rgb, uppercase) {
var rxArray = rgb.match(rx),
hex;
if (rxArray !== null) {
hex = pad(parseInt(rxArray[1], 10).toString(16)) + pad(parseInt(rxArray[2], 10).toString(16)) + pad(parseInt(rxArray[3], 10).toString(16));
if (uppercase === true) {
hex = hex.toUpperCase();
}
return hex;
}
return;
};
}());
console.log(rgbToHex(a));
console.log(rgbToHex(b, true));
console.log(rgbToHex(c));
console.log(rgbToHex(d));
console.log(rgbToHex(e));
console.log(rgbToHex(f));
console.log(rgbToHex(g));
On jsfiddle
Speed comparison on jsperf
A further improvement could be to trim()
the rgb
string
var rxArray = rgb.trim().match(rx),
color class taken from bootstrap color picker
// Color object
var Color = function(val) {
this.value = {
h: 1,
s: 1,
b: 1,
a: 1
};
this.setColor(val);
};
Color.prototype = {
constructor: Color,
//parse a string to HSB
setColor: function(val){
val = val.toLowerCase();
var that = this;
$.each( CPGlobal.stringParsers, function( i, parser ) {
var match = parser.re.exec( val ),
values = match && parser.parse( match ),
space = parser.space||'rgba';
if ( values ) {
if (space === 'hsla') {
that.value = CPGlobal.RGBtoHSB.apply(null, CPGlobal.HSLtoRGB.apply(null, values));
} else {
that.value = CPGlobal.RGBtoHSB.apply(null, values);
}
return false;
}
});
},
setHue: function(h) {
this.value.h = 1- h;
},
setSaturation: function(s) {
this.value.s = s;
},
setLightness: function(b) {
this.value.b = 1- b;
},
setAlpha: function(a) {
this.value.a = parseInt((1 - a)*100, 10)/100;
},
// HSBtoRGB from RaphaelJS
// https://github.com/DmitryBaranovskiy/raphael/
toRGB: function(h, s, b, a) {
if (!h) {
h = this.value.h;
s = this.value.s;
b = this.value.b;
}
h *= 360;
var R, G, B, X, C;
h = (h % 360) / 60;
C = b * s;
X = C * (1 - Math.abs(h % 2 - 1));
R = G = B = b - C;
h = ~~h;
R += [C, X, 0, 0, X, C][h];
G += [X, C, C, X, 0, 0][h];
B += [0, 0, X, C, C, X][h];
return {
r: Math.round(R*255),
g: Math.round(G*255),
b: Math.round(B*255),
a: a||this.value.a
};
},
toHex: function(h, s, b, a){
var rgb = this.toRGB(h, s, b, a);
return '#'+((1 << 24) | (parseInt(rgb.r) << 16) | (parseInt(rgb.g) << 8) | parseInt(rgb.b)).toString(16).substr(1);
},
toHSL: function(h, s, b, a){
if (!h) {
h = this.value.h;
s = this.value.s;
b = this.value.b;
}
var H = h,
L = (2 - s) * b,
S = s * b;
if (L > 0 && L <= 1) {
S /= L;
} else {
S /= 2 - L;
}
L /= 2;
if (S > 1) {
S = 1;
}
return {
h: H,
s: S,
l: L,
a: a||this.value.a
};
}
};
how to use
var color = new Color("RGB(0,5,5)");
color.toHex()
Since the question was using JQuery, here’s a JQuery plugin based on Daniel Elliott’s code:
$.fn.cssAsHex = function(colorProp) {
var hexDigits = '0123456789abcdef';
function hex(x) {
return isNaN(x) ? '00' : hexDigits[(x - x % 16) / 16] + hexDigits[x % 16];
};
// Convert RGB color to Hex format
function rgb2hex(rgb) {
var rgbRegex = rgb.match(/^rgb\((\d+),\s*(\d+),\s*(\d+)\)$/);
return '#' + hex(rgbRegex[1]) + hex(rgbRegex[2]) + hex(rgbRegex[3]);
};
return rgb2hex(this.css(colorProp));
};
Use it like:
var hexBackgroundColor = $('#myElement').cssAsHex('background-color');
To all the Functional Programming lovers, here is a somewhat functional approach :)
const getHexColor = (rgbValue) =>
rgbValue.replace("rgb(", "").replace(")", "").split(",")
.map(colorValue => (colorValue > 15 ? "0" : "") + colorValue.toString(16))
.reduce((acc, hexValue) => acc + hexValue, "#")
then use it like:
const testRGB = "rgb(13,23,12)"
getHexColor(testRGB)
Most browsers seem to return the RGB value when using:
$('#selector').css('backgroundColor');
Only I.E (only 6 tested so far) returns the Hex value.
To avoid error messages in I.E, you could wrap the function in an if statement:
function rgb2hex(rgb) {
if ( rgb.search("rgb") == -1 ) {
return rgb;
} else {
rgb = rgb.match(/^rgba?\((\d+),\s*(\d+),\s*(\d+)(?:,\s*(\d+))?\)$/);
function hex(x) {
return ("0" + parseInt(x).toString(16)).slice(-2);
}
return "#" + hex(rgb[1]) + hex(rgb[2]) + hex(rgb[3]);
}
}
Just to add to @Justin's answer above..
it should be
var rgb = document.querySelector('#selector').style['background-color'];
return '#' + rgb.substr(4, rgb.indexOf(')') - 4).split(',').map((color) => String("0" + parseInt(color).toString(16)).slice(-2)).join('');
As the above parse int functions truncates leading zeroes, thus produces incorrect color codes of 5 or 4 letters may be... i.e. for rgb(216, 160, 10) it produces #d8a0a while it should be #d8a00a.
Thanks
Steven Pribilinskiy's answer drops leading zeroes, for example #ff0000 becomes #ff00.
A solution is to append a leading 0 and substring off the last 2 digits.
var rgb = $('#selector').css('backgroundColor').match(/\d+/g);
var hex = '#'+ String('0' + Number(rgb[0]).toString(16)).slice(-2) + String('0' + Number(rgb[1]).toString(16)).slice(-2) + String('0' + Number(rgb[2]).toString(16)).slice(-2);
Here's a solution I found that does not throw scripting errors in IE: http://haacked.com/archive/2009/12/29/convert-rgb-to-hex.aspx
I am using Jasmine protractor and I was getting errors like
- Expected [ 'rgba(255, 255, 255, 1)' ] to contain '#fff'.
Below function worked fine for me.
function RGBAToHexA(test:string) {
let sep = test.toString().indexOf(",") > -1 ? "," : " ";
const rgba = test.toString().substring(5).split(")")[0].split(sep);
console.log(rgba)
let r = (+rgba[0]).toString(16),
g = (+rgba[1]).toString(16),
b = (+rgba[2]).toString(16),
a = Math.round(+rgba[3] * 255).toString(16);
if (r.length == 1)
r = "0" + r;
if (g.length == 1)
g = "0" + g;
if (b.length == 1)
b = "0" + b;
if (a.length == 1)
a = "0" + a;
return "#" + r + g + b + a;
}
describe('Check CSS', function() {
it('should check css of login page', async function(){
browser.waitForAngularEnabled(true);
browser.actions().mouseMove(element(by.css('.btn-auth, .btn-auth:hover'))).perform(); // mouse hover on button
csspage.Loc_auth_btn.getCssValue('color').then(function(color){
console.log(RGBAToHexA(color))
expect( RGBAToHexA(color)).toContain(cssData.hoverauth.color);
})
Improved function "hex"
function hex(x){
return isNaN(x) ? "00" : hexDigits[x >> 4] + hexDigits[x & 0xf];
// or option without hexDigits array
return (x >> 4).toString(16)+(x & 0xf).toString(16);
}
Here is a version that also checks for transparent, I needed this since my object was to insert the result into a style attribute, where the transparent version of a hex color is actually the word "transparent"..
function rgb2hex(rgb) {
if ( rgb.search("rgb") == -1 ) {
return rgb;
}
else if ( rgb == 'rgba(0, 0, 0, 0)' ) {
return 'transparent';
}
else {
rgb = rgb.match(/^rgba?\((\d+),\s*(\d+),\s*(\d+)(?:,\s*(\d+))?\)$/);
function hex(x) {
return ("0" + parseInt(x).toString(16)).slice(-2);
}
return "#" + hex(rgb[1]) + hex(rgb[2]) + hex(rgb[3]);
}
}
full cases (rgb, rgba, transparent...etc) solution (coffeeScript)
rgb2hex: (rgb, transparentDefault=null)->
return null unless rgb
return rgb if rgb.indexOf('#') != -1
return transparentDefault || 'transparent' if rgb == 'rgba(0, 0, 0, 0)'
rgb = rgb.match(/^rgba?\((\d+),\s*(\d+),\s*(\d+)(?:,\s*(\d+))?\)$/);
hex = (x)->
("0" + parseInt(x).toString(16)).slice(-2)
'#' + hex(rgb[1]) + hex(rgb[2]) + hex(rgb[3])
My beautiful non-standard solution
HTML
<div id="selector" style="background-color:#f5b405"></div>
jQuery
$("#selector").attr("style").replace("background-color:", "");
Result
#f5b405
Try
// c - color str e.g."rgb(12,233,43)", result color hex e.g. "#0ce92b"
let rgb2hex= c=> '#'+c.match(/\d+/g).map(x=>(+x).toString(16).padStart(2,0)).join``
// rgb - color str e.g."rgb(12,233,43)", result color hex e.g. "#0ce92b"_x000D_
let rgb2hex= c=> '#'+c.match(/\d+/g).map(x=>(+x).toString(16).padStart(2,0)).join``_x000D_
_x000D_
console.log(rgb2hex("rgb(12,233,43"));
_x000D_
Here is the cleaner solution I wrote based on @Matt suggestion:
function rgb2hex(rgb) {
rgb = rgb.match(/^rgb\((\d+),\s*(\d+),\s*(\d+)\)$/);
function hex(x) {
return ("0" + parseInt(x).toString(16)).slice(-2);
}
return "#" + hex(rgb[1]) + hex(rgb[2]) + hex(rgb[3]);
}
Some browsers already returns colors as hexadecimal (as of Internet Explorer 8 and below). If you need to deal with those cases, just append a condition inside the function, like @gfrobenius suggested:
function rgb2hex(rgb) {
if (/^#[0-9A-F]{6}$/i.test(rgb)) return rgb;
rgb = rgb.match(/^rgb\((\d+),\s*(\d+),\s*(\d+)\)$/);
function hex(x) {
return ("0" + parseInt(x).toString(16)).slice(-2);
}
return "#" + hex(rgb[1]) + hex(rgb[2]) + hex(rgb[3]);
}
If you're using jQuery and want a more complete approach, you can use CSS Hooks available since jQuery 1.4.3, as I showed when answering this question: Can I force jQuery.css("backgroundColor") returns on hexadecimal format?
my compact version
//Function to convert rgb color to hex format
function rgb2hex(rgb) {
if(/^#/.test(rgb))return rgb;// if returns colors as hexadecimal
let re = /\d+/g;
let hex = x => (x >> 4).toString(16)+(x & 0xf).toString(16);
return "#"+hex(re.exec(rgb))+hex(re.exec(rgb))+hex(re.exec(rgb));
}
_x000D_
Here's an ES6 one liner that doesn't use jQuery:
var rgb = document.querySelector('#selector').style['background-color'];
return '#' + rgb.substr(4, rgb.indexOf(')') - 4).split(',').map((color) => parseInt(color).toString(16)).join('');
Same answer like @Jim F answer but ES6 syntax , so, less instructions :
const rgb2hex = (rgb) => {
if (rgb.search("rgb") === -1) return rgb;
rgb = rgb.match(/^rgba?\((\d+),\s*(\d+),\s*(\d+)(?:,\s*(\d+))?\)$/);
const hex = (x) => ("0" + parseInt(x).toString(16)).slice(-2);
return "#" + hex(rgb[1]) + hex(rgb[2]) + hex(rgb[3]);
};
Function that returns background color of an element in hex.
function getBgColorHex(elem){
var color = elem.css('background-color')
var hex;
if(color.indexOf('#')>-1){
//for IE
hex = color;
} else {
var rgb = color.match(/\d+/g);
hex = '#'+ ('0' + parseInt(rgb[0], 10).toString(16)).slice(-2) + ('0' + parseInt(rgb[1], 10).toString(16)).slice(-2) + ('0' + parseInt(rgb[2], 10).toString(16)).slice(-2);
}
return hex;
}
usage example:
$('#div1').click(function(){
alert(getBgColorHex($(this));
}
Updated @ErickPetru for rgba compatibility:
function rgb2hex(rgb) {
rgb = rgb.match(/^rgba?\((\d+),\s*(\d+),\s*(\d+)(?:,\s*(\d+))?\)$/);
function hex(x) {
return ("0" + parseInt(x).toString(16)).slice(-2);
}
return "#" + hex(rgb[1]) + hex(rgb[2]) + hex(rgb[3]);
}
I updated the regex to match the alpha value if defined, but not use it.
This one looks a bit nicer:
var rgb = $('#selector').css('backgroundColor').match(/\d+/g);
var r = parseInt(rgb[0], 10);
var g = parseInt(rgb[1], 10);
var b = parseInt(rgb[2], 10);
var hex = '#'+ r.toString(16) + g.toString(16) + b.toString(16);
a more succinct one-liner:
var rgb = $('#selector').css('backgroundColor').match(/\d+/g);
var hex = '#'+ Number(rgb[0]).toString(16) + Number(rgb[1]).toString(16) + Number(rgb[2]).toString(16);
forcing jQuery to always return hex:
$.cssHooks.backgroundColor = {
get: function(elem) {
if (elem.currentStyle)
var bg = elem.currentStyle["backgroundColor"];
else if (window.getComputedStyle) {
var bg = document.defaultView.getComputedStyle(elem,
null).getPropertyValue("background-color");
}
if (bg.search("rgb") == -1) {
return bg;
} else {
bg = bg.match(/\d+/g);
function hex(x) {
return ("0" + parseInt(x).toString(16)).slice(-2);
}
return "#" + hex(bg[0]) + hex(bg[1]) + hex(bg[2]);
}
}
}
Source: Stackoverflow.com