How to append the hex color code

Question

Im using jquery-ui to make a color picker and im almost done with it. But i was wondering how i could append the hex color code.

HTML

 <div id="slider-horizontal"></div>
 <div class="pin"></div>

JQUERY

$(function() {
    var box = $('.pin')[0];

    $("#slider-horizontal").slider({
        orientation: "horizontal",
        min: 0,
        max: 360,
        value: 0,
        slide: function(event, ui) {
            box.style.background = 'hsl(' + ui.value + ', 100%, 50%)';
        }
    });
});

Any guidance would be appreciated. Thanks very much.

score 0 · Accepted Answer · answered Jun 07 '17 at 18:48

This page has many functions for converting from HSL to RGB. Using this function, you could have a div that has the RGB value in it, updated with the slide event along with the background color. Here is a snippet of the function:

/**
 * Converts an HSL color value to RGB. Conversion formula
 * adapted from http://en.wikipedia.org/wiki/HSL_color_space.
 * Assumes h, s, and l are contained in the set [0, 1] and
 * returns r, g, and b in the set [0, 255].
 *
 * @param   Number  h       The hue
 * @param   Number  s       The saturation
 * @param   Number  l       The lightness
 * @return  Array           The RGB representation
 */
function hslToRgb(h, s, l){
    var r, g, b;

    if(s == 0){
        r = g = b = l; // achromatic
    }else{
        function hue2rgb(p, q, t){
            if(t < 0) t += 1;
            if(t > 1) t -= 1;
            if(t < 1/6) return p + (q - p) * 6 * t;
            if(t < 1/2) return q;
            if(t < 2/3) return p + (q - p) * (2/3 - t) * 6;
            return p;
        }

        var q = l < 0.5 ? l * (1 + s) : l + s - l * s;
        var p = 2 * l - q;
        r = hue2rgb(p, q, h + 1/3);
        g = hue2rgb(p, q, h);
        b = hue2rgb(p, q, h - 1/3);
    }

    return [r * 255, g * 255, b * 255];
}

Going from RGB to HEX is much simpler, and can be achieved with the following functions from this SO answer:

function componentToHex(c) {
var hex = c.toString(16);
return hex.length == 1 ? "0" + hex : hex;
}

function rgbToHex(r, g, b) {
    return "#" + componentToHex(r) + componentToHex(g) + componentToHex(b);
}

How to append the hex color code

1 Answers1