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Convert Hex Color to rgba with opacity
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/** | |
* ECMA2015 | |
*/ | |
function convertHex(hexCode, opacity = 1){ | |
var hex = hexCode.replace('#', ''); | |
if (hex.length === 3) { | |
hex = hex[0] + hex[0] + hex[1] + hex[1] + hex[2] + hex[2]; | |
} | |
var r = parseInt(hex.substring(0,2), 16), | |
g = parseInt(hex.substring(2,4), 16), | |
b = parseInt(hex.substring(4,6), 16); | |
/* Backward compatibility for whole number based opacity values. */ | |
if (opacity > 1 && opacity <= 100) { | |
opacity = opacity / 100; | |
} | |
return 'rgba('+r+','+g+','+b+','+opacity+')'; | |
} |
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/** | |
* ECMA2016 / ES6 | |
*/ | |
const convertHexToRGBA = (hexCode, opacity = 1) => { | |
let hex = hexCode.replace('#', ''); | |
if (hex.length === 3) { | |
hex = `${hex[0]}${hex[0]}${hex[1]}${hex[1]}${hex[2]}${hex[2]}`; | |
} | |
const r = parseInt(hex.substring(0, 2), 16); | |
const g = parseInt(hex.substring(2, 4), 16); | |
const b = parseInt(hex.substring(4, 6), 16); | |
/* Backward compatibility for whole number based opacity values. */ | |
if (opacity > 1 && opacity <= 100) { | |
opacity = opacity / 100; | |
} | |
return `rgba(${r},${g},${b},${opacity})`; | |
}; |
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describe('convertHexToRGBA', () => { | |
test('accepts a hex value of 6 numbers and returns a rgba color string', () => { | |
expect(convertHexToRGBA('#F3F3F3')).toBe('rgba(243,243,243,1)') | |
}) | |
test('accepts a hex value of 6 numbers with opacity of 1 and returns same color string', () => { | |
expect(convertHexToRGBA('#000', 1)).toBe(convertHexToRGBA('#000')) | |
}) | |
test('accepts a hex value of 6 numbers with opacity and returns a rgba color string', () => { | |
expect(convertHexToRGBA('#000', 0.5)).toBe('rgba(0,0,0,0.5)') | |
}) | |
test('accepts a hex value of 3 numbers and returns a rgba color string', () => { | |
expect(convertHexToRGBA('#aaa')).toBe('rgba(170,170,170,1)') | |
}) | |
test('accepts a hex value of 3 numbers with opacity and returns a rgba color string', () => { | |
expect(convertHexToRGBA('#aaa', 0.5)).toBe('rgba(170,170,170,0.5)') | |
}) | |
test('accepts a hex value of 3 numbers with opacity of 1 and returns same color string', () => { | |
expect(convertHexToRGBA('#aaa', 1)).toBe(convertHexToRGBA('#aaa', 1)) | |
}) | |
}) |
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@MrMightyNighty - Thanks for the tip. Updated to include change to decimal based parameters, but also added a backward compatibility layer so it should theoretically work both ways, as long as you don't expect
0.9/100
to work without using pure0.009
, but I don't see that happening.