Due to some complications, the previous commit didn't work.

Pull Request for Issue #32494.

Demo page of the color-picker component right here.

Summary of Changes

• removed most minicolors assets
• added tinycolor asset
• added the new joomla-field-color-picker.es6.js as described in #32494
• updated the layouts/joomla/form/field/color/advanced.php file
• updated 3 language files
• updated most assets related json files with the new assets
• updated the build scripts

Testing Instructions

JavaScript Testing
The most important test for me, please report any error in the console along with the following info:

• Machine Operating System + Version
• Browser Name + Version

Existing Extensions Testing

• Open an extension that uses a <field type="Color" control="advanced"> field;
• Check if the <color-picker> updates the background of the visible input with the value stored in the database; if not the script is missing, not initialized or something happened, see below;
• If the above fails, check the browser console and check for any ColorPicker or TinyColor related errors; Report back here any error you encounter; I really hope there won't be;
• If however no error is reported in the browser console, click on the visible input to open the .color-dropdown then click anywhere outside of it, the .color-dropdown should close;
• Click on the visible input and pick a new color;
• Save the extension settings and check if the value is the one you have previously set in the above step;
• While the .color-dropdown element is visible try and resize the window, see if the console pops any error;
• While the window is under 768px wide and under 600px high, click the visible color input field and check where the .color-dropdown element is rendered (above or below the visible input), then scroll the window up/down while open to check if the .color-dropdown element should be re-positioned where it has the most available space;

Color Picker Options Testing

• Open /templates/cassiopeia/templateDetails.xml, find the <fieldset name="advanced"> tag and paste inside the following code:

<field
	name="advanced-color-hex"
	type="Color"
	format="hex"
	keywords="false"
	hint="Type in a valid hexadecimal colour value"
	default="#069"
	label="Text Color" />

<field
	name="advanced-color-rgb"
	type="Color"
	required="true"
	format="rgb"
	default="rgb(0,102,153)"
	label="Primary Color" />

<field
	name="advanced-color-hsl"
	type="Color"
	required="true"
	format="hsl"
	keywords="navy,lime,crimson,chocolate"
	default="hsla(265,100%,50%,.8)"
	label="Secondary Color" />

• <field name="advanced-color-hex"> sets the keywords="false" which disables the usage of presets and restricts the color-picker to only use format="hex" colors (in this particular case); the reason for this behavior is the need to send SCSS compilers real and valid HEX/RGB(a)/HSL(a) color values to be used for mixins, eg. darken($primary,15%) (darken('inherit',15%) won't work); this field should use a placeholder;
• <field name="advanced-color-rgb"> does not set the keywords option and will use the default keywords: transparent, curentColor, initial and inherit; as a result, the color-picker will display a button on the right side of the visible input to open a color options menu; these "non-color" values are valid CSS values; this field is required;
• <field name="advanced-color-hsl"> sets the keywords="navy,crimson.." and enables the usage of user defined presets based on web safe color names; because none of the above "non-color" keywords is present in the setting value, color-picker will again restrict values to only valid HSL(a) format colors for the same known reasons.

Keyboard Events Testing

• While the .color-dropdown is displayed, hit the ESC key of your keyboard, it should close/hide the element;
• While viewing a Joomla form page with a <field type="Color">, try and navigate the page with your keyboard, when you focus a color-picker it should open its .color-dropdown and allow you to navigate inside;
• For the <field type="Color" keywords="false"> delete the current value in the visible input first then try typing "inherit", "transparent" or "currentColor", it should set #000000 value;
• For the <field type="Color" keywords="navy,crimson.."> delete the current value in the visible input first then try typing "inherit", "transparent" or "currentColor", it should set a valid HEX/RGB(a)/HSL(a) value;
• For the <field type="Color"> which uses no keywords option. delete the current value in the visible input first then try typing "inherit", "transparent" or "currentColor", it should set that value;
• Test the visible input(s) of the .color-dropdown (where format is either "rgb" or "hsl"), focus one of them and try and change values by using the up/down buttons of the keyboard, it should instantly update the color picker on every change;
• Test the visible input(s) of the .color-dropdown (where format is either "rgb" or "hsl"), focus one of them and try and type 0-255 for "R", "G" or "B" for the <field type="Color" format="rgb"> field or 0-359 for "H", 0-100 for "S" or "L" for the <field type="Color" format="hsl"> , it should update the color picker on every change after a short delay (TinyColor will validate that color first);
• For the <field type="Color" format="hsl">, if the "L" (Lightness component) is 100, the "S" (Saturation component) and the "H" (Hue component) both should be locked at 0, then decrease lightness to 99 and this will unlock Saturation control, ultimately if you set Lightness to less than 100 and Saturation to at least 1, this will ultimately unlock Hue control (this will be explained in the documentation).

Testing the "onchange"
The implementation is similar with fancy-select, so you as tester, as well as third party devs should have a familiar feeling about color picker. For any of your <field type="Color" control="advanced"> make sure to also test "onchange":

• when typing values into inputs;
• when you slide the color-picker controls.

Mobile Testing

• Tap the visible input to open the color-picker and check if the visible input, the .color-dropdown and the mobile keyboard all are displayed on the mobile device screen; the color-picker will decrease its height by around 25% to fit most mobile devices;
• Try and reproduce all the tests explained above except everything to do with checking the browser console; we're interested in the behavior of the color-picker, it should feel snappy and accurate; it should dismiss the opened .color-dropdown popup on taping outside the element itself;

Accessibility Testing
Check the labels of all the visible inputs, find any ARIA related issues, report back anything you think it's not good enough in terms of accessibility, ARIA and so on.

The main focus:

• while the <joomla-field-color-picker> element is focused, hit Enter/Space to toggle the color picker visibility
• while closed, try Tab key, it should go to the next form field
• while open, try Tab key, it should navigate all focusable elements
• while open, try changing the visible pointers/sliders as well as the visible text inputs with arrow keys
• open your screen reader and try all the above with the screen reader scanning all your values and everything ARIA related.

Actual result BEFORE applying this Pull Request

All type="color" fields that use control="advanced" are outdated in terms of accessibility, usability and jQuery dependency.

Expected result AFTER applying this Pull Request

All your type="Color" fields that use control="advanced" are super awesome on any device and any user.

Documentation Changes Required

This documentation section mentions nothing about the control property/setting of the Color field, the following is a draft to provide guidance for this Joomla form field type as coded in libraries\src\Form\Field\ColorField.php in Joomla 4.0. Some parts of it need to be updated by their developer or some Joomla intern knowledgeable of this particular form field.

Documentation Draft

Provides a flexible form field that allow you to set a colour, with controls ranging from simple to advanced.

• name (mandatory) is the unique name of the parameter.
• type (mandatory) must be "Color".
• default (optional) provides a colour value when not set.
• format (optional) allows you to select the type of colour format, you can select "rgb", "rgba", "hsl", "hsla" or "hex".
• control (optional) allows you to select the type of controls the user need to set a colour, you can select "simple", "slider" or "advanced". The default is "advanced."
• colors (optional) allows you to set a list of colours to be used for the "simple" control. Shorthand HEX colors are not supported ("#fff"). Eg. colors="#ff0000,#0000ff".
• display (optional) allows you to display a single component for the "slider" control. You can set "hue", "saturation", "light" or "alpha".
• keywords (optional) allows you to set color presets for the "advanced" control. The default value is keywords="initial,inherit,currentColor,transparent", however you can disable the feature by using keywords="false" which will restrict the color picker to only use valid HEX, RGB(a) or HSL(a) values. If you include any of the default value (eg. "inherit") in the keywords list, it will remove the restriction.
• label (mandatory) (translatable) is the descriptive title of the field.
• description (optional) (translatable) allow you to provide more details for the form field.

Note on HSL(a) Format and Advanced Control

TinyColor is the script behind the color picker of the "advanced" control. This script will understand that values like hsl(0, 0%, 100%) and hsl(150, 0%, 100%) are visually identical, it will use the hsl(0, 0%, 100%) value. In addition, if the L (Lightness component) is 100% then the S (Saturation component) and the H (Hue component) both should be locked at 0 in the inputs of the color picker; if you decrease Lightness to 99% it will unlock Saturation control, ultimately if you set Lightness to less than 100% and Saturation to at least 1%, this will unlock Hue control.

Example XML Definition for Simple Control:

<field name="backgroundcolor"
	type="Color"
	format="hex"
	default="#ff0000"
	control="simple"
	colors="#ff0000,#008000,#0000ff"
	label="TPL_BEEZ3_FIELD_HEADER_BACKGROUND_COLOR_LABEL"
	description="TPL_BEEZ3_FIELD_HEADER_BACKGROUND_COLOR_DESC" />

Example XML Definition for Slider Control: (this part need to be updated by its developer)

<field name="backgroundcolor" 
	type="Color" 
	default="#ff0000" 
	format="hex"
	control="slider"
	display="hue"
	label="TPL_BEEZ3_FIELD_HEADER_BACKGROUND_COLOR_LABEL"
	description="TPL_BEEZ3_FIELD_HEADER_BACKGROUND_COLOR_DESC" />

Example XML Definition for Advanced Control:

<field name="backgroundcolor" 
	type="Color" 
	format="rgb"
	control="advanced"
	default="rgb(250,0,0)"
	keywords="initial,inherit,transparent,navy,lime" 
	label="TPL_BEEZ3_FIELD_HEADER_BACKGROUND_COLOR_LABEL"
	description="TPL_BEEZ3_FIELD_HEADER_BACKGROUND_COLOR_DESC" />