Javascript function to convert color names to hex codes

convert hex codes to color name : 

Step: 1 create manjeet.js file

var ntc = {

  init: function() {

    var color, rgb, hsl;

    for(var i = 0; i < ntc.names.length; i++)

    {

      color = "#" + ntc.names[i][0];

      rgb = ntc.rgb(color);

      hsl = ntc.hsl(color);

      ntc.names[i].push(rgb[0], rgb[1], rgb[2], hsl[0], hsl[1], hsl[2]);

    }

  },

  name: function(color) {

    color = color.toUpperCase();

    if(color.length < 3 || color.length > 7)

      return ["#000000", "Invalid Color: " + color, false];

    if(color.length % 3 == 0)

      color = "#" + color;

    if(color.length == 4)

      color = "#" + color.substr(1, 1) + color.substr(1, 1) + color.substr(2, 1) + color.substr(2, 1) + color.substr(3, 1) + color.substr(3, 1);

    var rgb = ntc.rgb(color);

    var r = rgb[0], g = rgb[1], b = rgb[2];

    var hsl = ntc.hsl(color);

    var h = hsl[0], s = hsl[1], l = hsl[2];

    var ndf1 = 0; ndf2 = 0; ndf = 0;

    var cl = -1, df = -1;

    for(var i = 0; i < ntc.names.length; i++)

    {

      if(color == "#" + ntc.names[i][0])

        return ["#" + ntc.names[i][0], ntc.names[i][1], true];

      ndf1 = Math.pow(r - ntc.names[i][2], 2) + Math.pow(g - ntc.names[i][3], 2) + Math.pow(b - ntc.names[i][4], 2);

      ndf2 = Math.pow(h - ntc.names[i][5], 2) + Math.pow(s - ntc.names[i][6], 2) + Math.pow(l - ntc.names[i][7], 2);

      ndf = ndf1 + ndf2 * 2;

      if(df < 0 || df > ndf)

      {

        df = ndf;

        cl = i;

      }

    }

    return (cl < 0 ? ["#000000", "Invalid Color: " + color, false] : ["#" + ntc.names[cl][0], ntc.names[cl][1], false]);

  },

  // adopted from: Farbtastic 1.2

  // http://acko.net/dev/farbtastic

  hsl: function (color) {

    var rgb = [parseInt('0x' + color.substring(1, 3)) / 255, parseInt('0x' + color.substring(3, 5)) / 255, parseInt('0x' + color.substring(5, 7)) / 255];

    var min, max, delta, h, s, l;

    var r = rgb[0], g = rgb[1], b = rgb[2];

    min = Math.min(r, Math.min(g, b));

    max = Math.max(r, Math.max(g, b));

    delta = max - min;

    l = (min + max) / 2;

    s = 0;

    if(l > 0 && l < 1)

      s = delta / (l < 0.5 ? (2 * l) : (2 - 2 * l));

    h = 0;

    if(delta > 0)

    {

      if (max == r && max != g) h += (g - b) / delta;

      if (max == g && max != b) h += (2 + (b - r) / delta);

      if (max == b && max != r) h += (4 + (r - g) / delta);

      h /= 6;

    }

    return [parseInt(h * 255), parseInt(s * 255), parseInt(l * 255)];

  },

  // adopted from: Farbtastic 1.2

  // http://acko.net/dev/farbtastic

  rgb: function(color) {

    return [parseInt('0x' + color.substring(1, 3)), parseInt('0x' + color.substring(3, 5)),  parseInt('0x' + color.substring(5, 7))];

  },

  names: [

["000000", "Black"],

["000080", "Navy Blue"],

["0000C8", "Dark Blue"],

["0000FF", "Blue"],

["000741", "Stratos"],

["EB9373", "Apricot"],

["EBC2AF", "Zinnwaldite"],

["ECA927", "Fuel Yellow"],

["FFFFFF", "White"]

]

}

ntc.init();

    /* you can use following code in js */

 

    var n_match  = ntc.name("#6195ED");

    n_name       = n_match[1]; // This is the text string for the name of the match

    alert(n_name);