244 lines
5.2 KiB
JavaScript
244 lines
5.2 KiB
JavaScript
|
const template = fn => {
|
||
|
return (arr, ...params) => {
|
||
|
if (arr instanceof Array) {
|
||
|
const buffer = []
|
||
|
for (let i = 0; i < params.length; i++) {
|
||
|
buffer.push(arr[i])
|
||
|
buffer.push(params[i])
|
||
|
}
|
||
|
buffer.push(arr[arr.length - 1])
|
||
|
return fn(buffer.join(""))
|
||
|
}
|
||
|
return fn(arr)
|
||
|
}
|
||
|
}
|
||
|
|
||
|
const f = template(string => {
|
||
|
const template = document.createElement("template")
|
||
|
template.innerHTML = string
|
||
|
return template.content
|
||
|
})
|
||
|
|
||
|
const css = template(string => {
|
||
|
const styleSheet = new CSSStyleSheet
|
||
|
styleSheet.replaceSync(string)
|
||
|
return styleSheet
|
||
|
})
|
||
|
|
||
|
const childObserver = new MutationObserver(mutations => {
|
||
|
for (const mutation of mutations) {
|
||
|
mutation.target.mutationCallback()
|
||
|
}
|
||
|
})
|
||
|
|
||
|
export class BetterSelect extends HTMLElement {
|
||
|
#abortOpen
|
||
|
#value = {}
|
||
|
|
||
|
#internals = this.attachInternals()
|
||
|
static formAssociated = true
|
||
|
|
||
|
static styleSheet = css`
|
||
|
:host {
|
||
|
position: relative;
|
||
|
}
|
||
|
* {
|
||
|
box-sizing: border-box;
|
||
|
}
|
||
|
[part="display"] {
|
||
|
display: inline-flex;
|
||
|
flex-flow: row nowrap;
|
||
|
|
||
|
min-width: 20em;
|
||
|
|
||
|
padding: .4em;
|
||
|
|
||
|
cursor: pointer;
|
||
|
|
||
|
:last-child {
|
||
|
display: block;
|
||
|
margin-left: auto;
|
||
|
}
|
||
|
}
|
||
|
:not(:empty + *)[name="placeholder"] {
|
||
|
display: none;
|
||
|
}
|
||
|
[part="drop-down"] {
|
||
|
/* Resets */
|
||
|
border: unset;
|
||
|
padding: unset;
|
||
|
background: inherit;
|
||
|
color: inherit;
|
||
|
|
||
|
position: absolute;
|
||
|
width: 100%;
|
||
|
flex-flow: column;
|
||
|
--gap: .4em;
|
||
|
margin: 0;
|
||
|
|
||
|
gap: var(--gap);
|
||
|
padding-top: var(--gap);
|
||
|
}
|
||
|
[part="drop-down"]:modal {
|
||
|
margin: auto;
|
||
|
&::backdrop {
|
||
|
background-color: #fff2;
|
||
|
backdrop-filter: blur(2px);
|
||
|
}
|
||
|
}
|
||
|
[part="drop-down"][open] {
|
||
|
display: flex;
|
||
|
}
|
||
|
[part="list"] {
|
||
|
display: contents;
|
||
|
}
|
||
|
[part="item"] {
|
||
|
display: block;
|
||
|
cursor: pointer;
|
||
|
}
|
||
|
[part="item"]:focus {
|
||
|
font-weight: bold;
|
||
|
}
|
||
|
[part="item"][hidden] {
|
||
|
display: none;
|
||
|
}
|
||
|
slot[name="loading"] {
|
||
|
display: none;
|
||
|
}
|
||
|
`
|
||
|
|
||
|
constructor() {
|
||
|
super()
|
||
|
childObserver.observe(this, {childList: true})
|
||
|
this.attachShadow({mode: "open"}).innerHTML = `
|
||
|
<div id="display" part="display">
|
||
|
<slot name="before"></slot>
|
||
|
<span part="display-text" id="text"></span>
|
||
|
<slot name="placeholder" aria-hidden="true"></slot>
|
||
|
<slot name="after">🔽</slot>
|
||
|
</div>
|
||
|
<dialog id="dialog" part="drop-down">
|
||
|
<input type="search" id="input" part="input" type="text"></input>
|
||
|
<ul id="list" part="list"></ul>
|
||
|
<slot name="loading"></slot>
|
||
|
</dialog>
|
||
|
`
|
||
|
this.shadowRoot.adoptedStyleSheets = [BetterSelect.styleSheet]
|
||
|
|
||
|
this.tabindex = 0
|
||
|
|
||
|
this.options = this.getElementsByTagName("option")
|
||
|
for (const element of this.shadowRoot.querySelectorAll(`[id]`)) this[element.id] = element
|
||
|
|
||
|
this.shadowRoot.addEventListener("click", event => {
|
||
|
const item = event.target.closest("#list > li")
|
||
|
if (item) {
|
||
|
this.setOption(item)
|
||
|
this.dispatchEvent(new InputEvent("input", {bubbles: true}))
|
||
|
this.close()
|
||
|
} else if (!this.#internals.states.has("--open")) {
|
||
|
this.open()
|
||
|
} else if (this.display.contains(event.target) || this.display.contains(event.target.closest("[slot]")?.assignedSlot)) {
|
||
|
this.close()
|
||
|
}
|
||
|
})
|
||
|
|
||
|
this.shadowRoot.addEventListener("input", event => {
|
||
|
const item = event.target.closest("#input")
|
||
|
if (item) {
|
||
|
this.search(item.value)
|
||
|
event.stopPropagation()
|
||
|
}
|
||
|
})
|
||
|
this.addEventListener("focus", event => {
|
||
|
this.open()
|
||
|
})
|
||
|
}
|
||
|
|
||
|
open() {
|
||
|
if (this.#abortOpen) return
|
||
|
|
||
|
this.#abortOpen = new AbortController()
|
||
|
|
||
|
const signal = this.#abortOpen.signal
|
||
|
window.addEventListener("click", event => {
|
||
|
if (!this.contains(event.target)) {
|
||
|
this.close()
|
||
|
}
|
||
|
}, {signal})
|
||
|
this.addEventListener("keypress", event => {
|
||
|
if (event.key == "Enter") {
|
||
|
this.selectDefault()
|
||
|
}
|
||
|
}, {signal})
|
||
|
|
||
|
this.dialog.show()
|
||
|
this.#internals.states.add("--open")
|
||
|
}
|
||
|
|
||
|
close() {
|
||
|
this.input.value = null
|
||
|
for (const hidden of this.list.querySelectorAll("[hidden]"))
|
||
|
hidden.removeAttribute("hidden")
|
||
|
this.#abortOpen?.abort()
|
||
|
this.#abortOpen = null
|
||
|
this.#internals.states.delete("--open")
|
||
|
this.dialog.close()
|
||
|
}
|
||
|
|
||
|
search(value) {
|
||
|
for (const item of this.list.children) {
|
||
|
item.toggleAttribute("hidden", !this.match(value, item))
|
||
|
}
|
||
|
}
|
||
|
|
||
|
selectDefault() {
|
||
|
const candidates = [...this.list.children].filter(child => !child.hasAttribute("hidden"))
|
||
|
if (candidates.length) {
|
||
|
this.setOption(candidates[0])
|
||
|
this.close()
|
||
|
}
|
||
|
}
|
||
|
|
||
|
match(value, item) {
|
||
|
return item.innerText.toLowerCase().match(value.toLowerCase())
|
||
|
}
|
||
|
|
||
|
connectedCallback() {
|
||
|
this.setOptions()
|
||
|
}
|
||
|
|
||
|
mutationCallback() {
|
||
|
this.setOptions()
|
||
|
}
|
||
|
|
||
|
setOption(option) {
|
||
|
this.setValue(option.dataset.value, option.innerHTML)
|
||
|
}
|
||
|
|
||
|
setValue(value, state=value) {
|
||
|
this.#value = {value, state}
|
||
|
this.#internals.setFormValue(value, state)
|
||
|
this.text.innerText = state
|
||
|
}
|
||
|
|
||
|
get value() { return this.#value.value }
|
||
|
set value(value) {
|
||
|
for (const option of this.options) {
|
||
|
if (option.value === value) {
|
||
|
return this.setOption(option)
|
||
|
}
|
||
|
}
|
||
|
throw `No option with value ${value}`
|
||
|
}
|
||
|
|
||
|
get valueText() { return this.#value.state }
|
||
|
|
||
|
setOptions() {
|
||
|
this.list.replaceChildren()
|
||
|
for (const option of this.options) {
|
||
|
this.list.append(f`<li tab-index="-1" part="item" data-value="${option.value}">${option.innerText}</li>`)
|
||
|
}
|
||
|
}
|
||
|
}
|