**⚠️ Supported only in modern browsers**
* Carefully crafted as lightweight as possible
* Mousewheel-suppored *range silders*
* Minimal UX for smallest screen footprint
* Supported color formats: [`x11 color codes`](https://en.wikipedia.org/wiki/X11_color_names),
`hexa`, `rgba`, `hsla`
* Positioning-engine **not included**. Use your own, or one suggested below
* Optional color swatches:
* pre-determined values (un-removable)
* custom color add/remove swatch
* optional global sync with *localstorage* between picker instances
---
This color-picker component is based on my previous work with highly customizable range input (slider) component: [UI-Range](https://github.com/yairEO/ui-range)
and the power of HSLA color format infused into custom CSS properties (variables) to allow as lightweight solution as possible.
I have hand-crafted the color transformation functions to be as lightweight as possible, and kept the UI to
the minimum necessary to provide the user with a better, unified, color-picking experience which I believe is better
than the default `` which looks different across browsers and OS, and does ***not*** allow modifications to a color's *alpha* (opacity) channel.
Since this component is ***only*** a color-picker, and does not transforms or interacts with any `` elements on the page,
it is up to developers, if they wish, to connect it to an input and have the color-picker positioned next to it in a popup-manner.
Such behavior can be seen seen in the demo page and below, on the last section.
I advise using a `type='text'` input which can offer support for any color format (as a string) because `type='text'` cannot work with named colors such as `value='red'`.
## Install
npm i @yaireo/color-picker
## Use
The codebase is bundled into 2 formats:
`iife` (to be used as standalone script):
```html
```
`es` (to be used via `import` command in your bundle or moduled sciprt).
This is the default ("main") the package serves:
```html
```
```js
const cPicker = new ColorPicker({
// accepted formats: HEX(A), RGB(A), HSL(A), X11 color name
color: 'red',
// default rendered textual represention format
// default: 'hex'
defaultFormat: 'hex',
// initial class name for the component's wrapper element
// default: ''
className: 'hidden',
// to disable, set "false" instead of an Array
// default: []
swatches: ['red', '#666', 'rgba(10,20,30,.5)'],
// saves colors for persistance and cross-usage between picker instances
// default: false
swatchesLocalStorage: true,
// buttons text & icon
buttons: {
undo : { icon: '↶', title: 'Undo' },
format : { icon: '⇆', title: 'Switch Color Format' },
add : { icon: '+', title: 'Add to Swatches' }
},
// fired rapidly, on every range slider movement or any color change
onInput(color){},
// like "onInput", but not fired while a range slider is moved
onChange(color){},
// helpful when the component is used as a popup
onClickOutside(e){}
})
```
## Example
In the below example the color picker is used as a *popup*, so when an input of type `color` is clicked, the popup
is shown in a way which doesn't affect the flow of the page.
Since this component was designed as bare-minimum, it has no internal positioning-system
and can be pluged with one, for example, [my own](https://github.com/yairEO/position).
In the below example, the color-picker is being bound to an input element, so when the color-picker
is being changes, so will the other input.
```html
```
```js
// because "@yaireo/position" is used (in this demo) as a script file and not an node module (ES export)
position = position.default;
const cPicker = new ColorPicker({
color: myColor.value, // use the input element's value
className: 'hidden', // optional class name which will be added to the color-picker component
swatches: ['white', '#000', 'rgba(255,0,0,.3)'],
// when clicking anywhere that is not within the color picker.
// use special logic if clicked on the color-input which is
// assosiacated with this specific picker
onClickOutside(e){
let action = 'add',
isTargetColorInput = e.target == myColor
if( isTargetColorInput ) action = 'toggle'
if( e.key == 'Escape' ) action = 'add'
cPicker.DOM.scope.classList[action]('hidden')
isTargetColorInput && observerCallback()
},
onInput(color){
myColor.value = color;
myColor.style.setProperty('--color', color)
},
})
// add the color picker to the DOM
document.body.appendChild(cPicker.DOM.scope)
const observerCallback = (entries) => {
!cPicker.DOM.scope.classList.contains('hidden') &&
position({ target:cPicker.DOM.scope, ref:myColor });
}
const resizeObserver = new ResizeObserver(observerCallback)
const intersectionObserver = new IntersectionObserver(observerCallback, {root:document, threshold:1});
// position the color picker next to the input element
resizeObserver.observe(document.body)
intersectionObserver.observe(cPicker.DOM.scope)
observerCallback()
// re-position on window resize
resizeObserver.observe(document.body)
```
### Listen to input external `value` changes
If your element's value property might change by means other than this color picker component,
then it is advisable to periodically check and match the color picker's internal value to the input's value.
```js
import ColorPicker, {any_to_hex} from '@yaireo/color-picker'
const colorInput = document.querySelector('input')
const cPicker = new ColorPicker(...)
const VALUE_CHANGE_SAMPLING_DURATION = 1000
setInterval(() => {
const inputValue = any_to_hex(colorInput.value)
const pickerValue = any_to_hex(cPicker.CSSColor)
if(pickerValue != inputValue)
cPicker.setColor(inputValue)
}, VALUE_CHANGE_SAMPLING_DURATION);
```
### Helper methods exported alongside the *default* `ColorPicker`
| Name | Parameters | Info |
|---------------------|---------------------------------|-------------------------------------------------------------------------------------|
| `any_to_hex` | `String` | Converts any color string to `hex` format
| `hex_rgba` | `String` | Converts `Hex` to `RGBA` format
| `rgba_hsla` | `String` | Converts `RGBA` to `HSLA` format
| `CSStoHSLA` | `String` | Converts CSS-string `HSLA` to an `HSLA` javascript Object
| `HSLAtoCSS` | `String` | Converts `HSLA` Object to CSS-string
| `changeColorFormat` | color `string`, format `string` | Converts any color string to another color format string
### Methods (`ColorPicker` instance)
| Name | Parameters | Info |
|------------------|-----------------------|-------------------------------------------------------------------------------|
| `setColor` | `String` | Sets the instance color
| `getColorFormat` | `String` | Gets the format of a color string: `hex`, `rgba` or `hsla`