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Code Editor : joomla-field-color-slider.js

/**
 * @copyright   (C) 2019 Open Source Matters, Inc. <https://www.joomla.org>
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

/* eslint class-methods-use-this: ["error", { "exceptMethods": ["rgbToHex", "hslToRgb"] }] */
(document => {
  /**
   * Regex for hex values e.g. #FF3929
   * @type {RegExp}
   */

const hexRegex = new RegExp(/^#([a-z0-9]{1,2})([a-z0-9]{1,2})([a-z0-9]{1,2})$/i);
  /**
   * Regex for rgb values e.g. rgba(255, 0, 24, 0.5);
   * @type {RegExp}
   */

const rgbRegex = new RegExp(/^rgba?$([0-9]+)[\D]+([0-9]+)[\D]+([0-9]+)(?:[\D]+([0-9](?:.\d+)?))?$$/i);
  /**
   * Regex for hsl values e.g. hsl(255,0,24);
   * @type {RegExp}
   */

const hslRegex = new RegExp(/^hsla?$([0-9]+)[\D]+([0-9]+)[\D]+([0-9]+)[\D]+([0-9](?:.\d+)?)?$$/i);
  /**
   * Regex for saturation and lightness of hsl - only accepts 1 or 0 or 0.4 or 40
   * @type {RegExp}
   */

const hslNumberRegex = new RegExp(/^(([0-1])|(0\\.[0-9]+)|([0-9]{1,2})|(100))$/);
  /**
   * Regex for hue values - one to three numbers
   * @type {RegExp}
   */

const hueRegex = new RegExp(/^[0-9]{1,3}$/);
  /**
   * Creates a slider for the color values hue, saturation and light.
   *
   * @since 4.0.0
   */

class JoomlaFieldColorSlider {
    /**
     * @param {HTMLElement} element
     */
    constructor(element) {
      // Elements
      this.messageSpan = element.querySelector('.form-control-feedback');
      this.mainInput = element.querySelector('.color-input');
      this.input = element.querySelector('#slider-input');
      this.sliders = element.querySelectorAll('.color-slider');
      this.hueSlider = element.querySelector('#hue-slider');
      this.saturationSlider = element.querySelector('#saturation-slider');
      this.lightSlider = element.querySelector('#light-slider');
      this.alphaSlider = element.querySelector('#alpha-slider'); // Attributes

this.color = element.dataset.color || '';
      this.default = element.dataset.default || '';
      this.format = this.input.dataset.format || 'hex';
      this.saveFormat = this.mainInput.dataset.format || 'hex';
      this.preview = element.dataset.preview === 'true';
      this.setAlpha = this.format === 'hsla' || this.format === 'rgba';
      this.hue = 360;
      this.saturation = 1;
      this.light = 1;
      this.alpha = 1;
      this.defaultHsl = [this.hue, this.saturation, this.light, this.alpha];
      this.setInitValue();
      this.setBackground(); // Hide preview field, when selected value should not be visible

if (!this.preview) {
        this.input.classList.add('hidden');
      } else {
        this.setInputPattern();
      } // Always hide main input field (value saved in database)

this.mainInput.classList.add('hidden');
      Array.prototype.forEach.call(this.sliders, slider => {
        slider.addEventListener('change', () => this.updateValue(slider));
      });
      this.input.addEventListener('change', () => this.changeInput(this.input));
    }
    /**
     * Set selected value into input field and set it as its background-color.
     */

updateValue(slider) {
      this.showError('');
      const hsl = this.getSliderValueAsHsl(slider.value, slider.dataset.type);
      const rgb = this.hslToRgb(hsl);
      [this.hue, this.saturation, this.light, this.alpha] = hsl;
      this.input.style.border = `2px solid ${this.getRgbString(rgb)}`;
      this.setSliderValues(hsl, slider.dataset.type);
      this.setInputValue(hsl);
      this.setBackground(slider);
    }
    /**
     * React on user changing input value
     *
     * @param {HTMLElement} inputField
     */

changeInput(inputField) {
      let hsl = [this.hue, this.saturation, this.light, this.alpha];

if (!inputField.value) {
        this.mainInput.value = '';
        this.showError('');
        return;
      }

if (!this.checkValue(inputField.value)) {
        this.showError('JFIELD_COLOR_ERROR_WRONG_FORMAT');
        this.setInputValue(this.defaultHsl);
      } else {
        this.showError('');

switch (this.format) {
          case 'hue':
            hsl[0] = inputField.value;
            this.hue = inputField.value;
            break;

case 'saturation':
            hsl[1] = inputField.value;
            this.saturation = inputField.value;
            break;

case 'light':
            hsl[2] = inputField.value;
            this.light = inputField.value;
            break;

case 'alpha':
            hsl[3] = inputField.value;
            this.alpha = inputField.value;
            break;

default:
            hsl = this.getHsl(inputField.value);
        }

this.setSliderValues(hsl);
        this.setInputValue(hsl, true);
      }
    }
    /**
     * Check validity of value
     *
     * @param {number|string} value to check
     * @param {string=false} format for which the value gets tested
     * @returns {boolean}
     */

checkValue(value, format) {
      const test = format || this.format;

switch (test) {
        case 'hue':
          return value <= 360 && hueRegex.test(value);

case 'saturation':
        case 'light':
        case 'alpha':
          return hslNumberRegex.test(value);

case 'hsl':
        case 'hsla':
          return hslRegex.test(value);

case 'hex':
          return hexRegex.test(value);

case 'rgb':
        case 'rgba':
          return rgbRegex.test(value);

default:
          return false;
      }
    }
    /**
     * Set validation pattern on input field
     */

setInputPattern() {
      let pattern; // RegExp has '/' at start and end

switch (this.format) {
        case 'hue':
          pattern = hueRegex.source.slice(1, -1);
          break;

case 'saturation':
        case 'light':
        case 'alpha':
          pattern = hslNumberRegex.source.slice(1, -1);
          break;

case 'hsl':
        case 'hsla':
          pattern = hslRegex.source.slice(1, -1);
          break;

case 'rgb':
          pattern = rgbRegex.source.slice(1, -1);
          break;

case 'hex':
        default:
          pattern = hexRegex.source.slice(1, -1);
      }

this.input.setAttribute('pattern', pattern);
    }
    /**
     * Set linear gradient for slider background
     * @param {HTMLInputElement} [exceptSlider]
     */

setBackground(exceptSlider) {
      Array.prototype.forEach.call(this.sliders, slider => {
        // Jump over changed slider
        if (exceptSlider === slider) {
          return;
        }

let colors = [];
        let endValue = 100; // Longer start color so slider selection matches displayed colors

colors.push(this.getSliderValueAsRgb(0, slider.dataset.type));

if (slider.dataset.type === 'hue') {
          const steps = Math.floor(360 / 20);
          endValue = 360;

for (let i = 0; i <= 360; i += steps) {
            colors.push(this.getSliderValueAsRgb(i, slider.dataset.type));
          }
        } else {
          for (let i = 0; i <= 100; i += 10) {
            colors.push(this.getSliderValueAsRgb(i, slider.dataset.type));
          }
        } // Longer end color so slider selection matches displayed colors

colors.push(this.getSliderValueAsRgb(endValue, slider.dataset.type));
        colors = colors.map(value => this.getRgbString(value));
        slider.style.background = `linear-gradient(90deg, ${colors.join(',')})`;
        slider.style.webkitAppearance = 'none';
      });
    }
    /**
     * Convert given color into hue, saturation and light
     */

setInitValue() {
      // The initial value can be also a color defined in css
      const cssValue = window.getComputedStyle(this.input).getPropertyValue(this.default);
      this.default = cssValue || this.default;

if (this.color === '' || typeof this.color === 'undefined') {
        // Unable to get hsl with empty value
        this.input.value = '';
        this.mainInput.value = '';
        return;
      }

const value = this.checkValue(this.color, this.saveFormat) ? this.color : this.default;

if (!value) {
        this.showError('JFIELD_COLOR_ERROR_NO_COLOUR');
        return;
      }

let hsl = []; // When given value is a number, use it as defined format and get rest from default value

if (/^[0-9]+$/.test(value)) {
        hsl = this.default && this.getHsl(this.default);

if (this.format === 'hue') {
          hsl[0] = value;
        }

if (this.format === 'saturation') {
          hsl[1] = value > 1 ? value / 100 : value;
        }

if (this.format === 'light') {
          hsl[2] = value > 1 ? value / 100 : value;
        }

if (this.format === 'alpha') {
          hsl[3] = value > 1 ? value / 100 : value;
        }
      } else {
        hsl = this.getHsl(value);
      }

[this.hue, this.saturation, this.light] = hsl;
      this.alpha = hsl[4] || this.alpha;
      this.defaultHsl = this.default ? this.getHsl(this.default) : hsl;
      this.setSliderValues(hsl);
      this.setInputValue(hsl);
      this.input.style.border = `2px solid ${this.getRgbString(this.hslToRgb(hsl))}`;
    }
    /**
     * Insert message into error message span
     * Message gets handled with Joomla.Text or as empty string
     *
     * @param {string} msg
     */

showError(msg) {
      this.messageSpan.innerText = msg ? Joomla.Text._(msg) : '';
    }
    /**
     * Convert value into HSLa e.g. #003E7C => [210, 100, 24]
     * @param {array|number|string} value
     * @returns {array}
     */

getHsl(value) {
      let hsl = [];

if (Array.isArray(value)) {
        hsl = value;
      } else if (hexRegex.test(value)) {
        hsl = this.hexToHsl(value);
      } else if (rgbRegex.test(value)) {
        hsl = this.rgbToHsl(value);
      } else if (hslRegex.test(value)) {
        const matches = value.match(hslRegex);
        hsl = [matches[1], matches[2], matches[3], matches[4]];
      } else {
        this.showError('JFIELD_COLOR_ERROR_CONVERT_HSL');
        return this.defaultHsl;
      } // Convert saturation etc. values from e.g. 40 to 0.4

let i;

for (i = 1; i < hsl.length; i += 1) {
        hsl[i] = hsl[i] > 1 ? hsl[i] / 100 : hsl[i];
      }

return hsl;
    }
    /**
     * Returns HSL value from color slider value
     * @params {int} value convert this value
     * @params {string} type type of value: hue, saturation, light or alpha
     * @returns array
     */

getSliderValueAsHsl(value, type) {
      let h = this.hue;
      let s = this.saturation;
      let l = this.light;
      let a = this.alpha;

switch (type) {
        case 'alpha':
          a = value;
          break;

case 'saturation':
          s = value;
          break;

case 'light':
          l = value;
          break;

case 'hue':
        default:
          h = value;
      } // Percentage light and saturation

if (l > 1) {
        l /= 100;
      }

if (s > 1) {
        s /= 100;
      }

if (a > 1) {
        a /= 100;
      }

return [h, s, l, a];
    }
    /**
     * Calculates RGB value from color slider value
     * @params {int} value convert this value
     * @params {string} type type of value: hue, saturation, light or alpha
     * @returns array
     */

getSliderValueAsRgb(value, type) {
      return this.hslToRgb(this.getSliderValueAsHsl(value, type));
    }
    /**
     * Set value in all sliders
     * @param {array} [hsla]
     * @param {string} [except]
     */

setSliderValues([h, s, l, a], except) {
      if (this.hueSlider && except !== 'hue') {
        this.hueSlider.value = Math.round(h);
      }

if (this.saturationSlider && except !== 'saturation') {
        this.saturationSlider.value = Math.round(s * 100);
      }

if (this.lightSlider && except !== 'light') {
        this.lightSlider.value = Math.round(l * 100);
      }

if (a && this.alphaSlider && except !== 'alpha') {
        this.alphaSlider.value = Math.round(a * 100);
      }
    }
    /**
     * Set value in text input fields depending on their format
     * @param {array} hsl
     * @param {boolean=false} onlyMain indicates to change mainInput only
     */

setInputValue(hsl, onlyMain) {
      const inputs = [this.mainInput];

if (!onlyMain) {
        inputs.push(this.input);
      }

inputs.forEach(input => {
        let value;

switch (input.dataset.format) {
          case 'hsl':
            value = this.getHslString(hsl);
            break;

case 'hsla':
            value = this.getHslString(hsl, true);
            break;

case 'rgb':
            value = this.getRgbString(this.hslToRgb(hsl));
            break;

case 'rgba':
            value = this.getRgbString(this.hslToRgb(hsl), true);
            break;

case 'hex':
            value = this.rgbToHex(this.hslToRgb(hsl));
            break;

case 'alpha':
            value = Math.round(hsl[3] * 100);
            break;

case 'saturation':
            value = Math.round(hsl[1] * 100);
            break;

case 'light':
            value = Math.round(hsl[2] * 100);
            break;

case 'hue':
          default:
            value = Math.round(hsl[0]);
            break;
        }

input.value = value;
      });
    }
    /**
     * Put RGB values into a string like 'rgb(<R>, <G>, <B>)'
     * @params {array} rgba
     * @params {boolean=false} withAlpha
     * @return {string}
     */

getRgbString([r, g, b, a], withAlpha) {
      if (withAlpha || this.setAlpha) {
        const alpha = typeof a === 'undefined' ? this.alpha : a;
        return `rgba(${r}, ${g}, ${b}, ${alpha})`;
      }

return `rgb(${r}, ${g}, ${b})`;
    }
    /**
     * Put HSL values into a string like 'hsl(<H>, <S>%, <L>%, <a>)'
     * @params {array} values
     * @params {boolean=false} withAlpha
     * @return {string}
     */

getHslString(values, withAlpha) {
      let [h, s, l, a] = values;
      s *= 100;
      l *= 100;
      [h, s, l] = [h, s, l].map(value => Math.round(value));

if (withAlpha || this.setAlpha) {
        a = a || this.alpha;
        return `hsla(${h}, ${s}%, ${l}%, ${a})`;
      }

return `hsl(${h}, ${s}%, ${l}%)`;
    }
    /**
     * Returns hsl values out of hex
     * @param {array} rgb
     * @return {string}
     */

rgbToHex(rgb) {
      let r = rgb[0].toString(16).toUpperCase();
      let g = rgb[1].toString(16).toUpperCase();
      let b = rgb[2].toString(16).toUpperCase(); // Double value for hex with '#' and 6 chars

r = r.length === 1 ? `${r}${r}` : r;
      g = g.length === 1 ? `${g}${g}` : g;
      b = b.length === 1 ? `${b}${b}` : b;
      return `#${r}${g}${b}`;
    }
    /**
     * Returns hsl values out of rgb
     * @param {string|array} values
     * @return {array}
     */

rgbToHsl(values) {
      let rgb = values;

if (typeof values === 'string') {
        const parts = values.match(rgbRegex);
        rgb = [parts[1], parts[2], parts[3], parts[4]];
      }

const [r, g, b] = rgb.map(value => value > 1 ? value / 255 : value);
      const max = Math.max(r, g, b);
      const min = Math.min(r, g, b);
      const l = (max + min) / 2;
      const d = max - min;
      let h = 0;
      let s = 0;
      let a = rgb[3] || values[3] || this.alpha;

if (max !== min) {
        if (max === 0) {
          s = max;
        } else if (min === 1) {
          s = min;
        } else {
          s = (max - l) / Math.min(l, 1 - l);
        }

switch (max) {
          case r:
            h = 60 * (g - b) / d;
            break;

case g:
            h = 60 * (2 + (b - r) / d);
            break;

case b:
          default:
            h = 60 * (4 + (r - g) / d);
            break;
        }
      }

h = h < 0 ? h + 360 : h;
      a = a > 1 ? a / 100 : a;
      return [h, s, l, a];
    }
    /**
     * Returns hsl values out of hex
     * @param {string} hex
     * @return {array}
     */

hexToHsl(hex) {
      const parts = hex.match(hexRegex);
      const r = parts[1];
      const g = parts[2];
      const b = parts[3];
      const rgb = [parseInt(r, 16), parseInt(g, 16), parseInt(b, 16)];
      return this.rgbToHsl(rgb);
    }
    /**
     * Convert HSLa values into RGBa
     * @param {array} hsla
     * @returns {number[]}
     */

hslToRgb([h, sat, light, alpha]) {
      let r = 1;
      let g = 1;
      let b = 1; // Saturation and light were calculated as 0.24 instead of 24%

const s = sat > 1 ? sat / 100 : sat;
      const l = light > 1 ? light / 100 : light;
      const a = alpha > 1 ? alpha / 100 : alpha;

if (h < 0 || h > 360 || s < 0 || s > 1 || l < 0 || l > 1) {
        this.showError('JFIELD_COLOR_ERROR_CONVERT_HSL');
        return this.hslToRgb(this.defaultHsl);
      }

const c = (1 - Math.abs(2 * l - 1)) * s;
      const hi = h / 60;
      const x = c * (1 - Math.abs(hi % 2 - 1));
      const m = l - c / 2;

if (h >= 0 && h < 60) {
        [r, g, b] = [c, x, 0];
      } else if (h >= 60 && h < 120) {
        [r, g, b] = [x, c, 0];
      } else if (h >= 120 && h < 180) {
        [r, g, b] = [0, c, x];
      } else if (h >= 180 && h < 240) {
        [r, g, b] = [0, x, c];
      } else if (h >= 240 && h < 300) {
        [r, g, b] = [x, 0, c];
      } else if (h >= 300 && h <= 360) {
        [r, g, b] = [c, 0, x];
      } else {
        this.showError('JFIELD_COLOR_ERROR_CONVERT_HUE');
        return this.hslToRgb(this.defaultHsl);
      }

const rgb = [r, g, b].map(value => Math.round((value + m) * 255));
      rgb.push(a);
      return rgb;
    }

}

document.addEventListener('DOMContentLoaded', () => {
    const fields = document.querySelectorAll('.color-slider-wrapper');

if (fields) {
      Array.prototype.forEach.call(fields, slider => {
        // eslint-disable-next-line no-new
        new JoomlaFieldColorSlider(slider);
      });
    }
  });
})(document);

${this.title}

Code Editor : joomla-field-color-slider.js