How can i convert ARGB to HEX in JavaScript?

Question

I want to convert ARGB colors to CSS-compatible hex

for example:

-1 should be converted to #FFFFFF

or

-16777216 to #000000

How can I do that in JavaScript?

Answer 1

This discards any alpha component

function argbToRGB(color) {
    return '#'+ ('000000' + (color & 0xFFFFFF).toString(16)).slice(-6);
}

Your colors are signed 32-bits and full alpha (0xFF) makes the numbers negative. This code works even for unsigned numbers.