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import { SearchAutocompleteOptions } from "../autocomplete"
type OnClickBindings<State> = {
[key: string]: (obj: {
data: string | undefined
el: HTMLElement
update: (state: State) => void
}) => unknown
}
export function createDropdown<State>(
container: HTMLElement,
initialState: PromiseLike<State>,
render: (container: HTMLElement, state: State) => void | PromiseLike<void>,
submit: (inputValue: string, options?: SearchAutocompleteOptions) => unknown,
updateInput: (inputValue: string) => void,
onClickBindings?: OnClickBindings<State>
) {
let elements: HTMLElement[] = []
let unbindCallbacks: Array<() => void> = []
let isEmpty: boolean = true
let selectedIndex: number = -1
function handleElementSubmit(el: HTMLElement): void {
const hit = el?.dataset?.nsHit
if (hit) {
const parsedHit = parseHit(hit)
hide()
if (parsedHit?.item) {
submit(parsedHit.item)
return
}
if (parsedHit?.keyword) {
submit(parsedHit.keyword, {
redirect: !!parsedHit?._redirect,
isKeyword: true,
})
Iif (parsedHit?._redirect) {
location.href = parsedHit._redirect
}
return
}
if (parsedHit?.url) {
location.href = parsedHit.url
}
}
}
function loadElements() {
isEmpty = !container.innerHTML.trim()
if (!isEmpty) {
elements = Array.from<HTMLElement>(
container.querySelectorAll("[data-ns-hit]")
).map(el => {
bindElementSubmit(el)
return el
})
}
}
function bindDataCallbacks() {
Object.entries(onClickBindings ?? {}).map(([key, callback]) => {
// Convert camelCase to kebab-case
const dataKey = `[data-ns-${key
.replace(/([A-Z])/g, "-$1")
.toLowerCase()}]`
Array.from<HTMLElement>(container.querySelectorAll(dataKey)).map(el => {
const data =
el?.dataset?.[`ns${key.charAt(0).toUpperCase() + key.slice(1)}`]
const onClick = () => {
callback({
data,
el,
update,
})
}
el.addEventListener("click", onClick)
unbindCallbacks.push(() => {
el.removeEventListener("click", onClick)
})
})
})
}
function bindElementSubmit(el: HTMLElement) {
const onSubmit = () => {
handleElementSubmit(el)
}
el.addEventListener("click", onSubmit)
unbindCallbacks.push(() => {
el.removeEventListener("click", onSubmit)
})
}
function highlight(index: number, prevIndex?: number) {
if (typeof prevIndex === "number" && elements[prevIndex]) {
elements[prevIndex].classList.remove("selected")
}
if (typeof index === "number" && elements[index]) {
elements[index]?.classList.add("selected")
const hit = elements[index]?.dataset?.nsHit
if (hit) {
const parsedHit = parseHit(hit)
if (parsedHit.item) {
updateInput(parsedHit.item)
return
}
if (parsedHit.keyword) {
updateInput(parsedHit.keyword)
return
}
}
}
}
function dispose() {
resetHighlight()
elements = []
unbindCallbacks.forEach(v => v())
unbindCallbacks = []
}
async function update(state: State) {
dispose()
await Promise.resolve(render(container, state))
// Without setTimeout React does not have committed DOM changes yet, so we don't have the correct elements.
setTimeout(() => {
loadElements()
bindDataCallbacks()
show()
}, 0)
}
function hide() {
resetHighlight()
container.style.display = "none"
}
function show() {
if (!isEmpty) {
container.style.display = ""
} else {
hide()
}
}
function clear() {
dispose()
isEmpty = true
hide()
}
function isOpen() {
return container.style.display !== "none"
}
function goDown() {
let prevIndex = selectedIndex
if (selectedIndex === elements.length - 1) {
selectedIndex = 0
} else {
prevIndex = selectedIndex++
}
highlight(selectedIndex, prevIndex)
}
function goUp() {
if (hasHighlight()) {
let prevIndex = selectedIndex
if (selectedIndex === 0) {
selectedIndex = elements.length - 1
} else {
prevIndex = selectedIndex--
}
highlight(selectedIndex, prevIndex)
} else E{
selectedIndex = elements.length - 1
highlight(selectedIndex)
}
}
function handleSubmit() {
if (isOpen() && hasHighlight() && elements[selectedIndex]) {
handleElementSubmit(elements[selectedIndex])
}
}
function hasHighlight() {
return selectedIndex > -1
}
function getHighlight() {
return elements[selectedIndex]
}
function resetHighlight() {
if (hasHighlight()) {
elements[selectedIndex]?.classList.remove("selected")
selectedIndex = -1
}
}
function destroy() {
dispose()
isEmpty = true
container.innerHTML = ""
}
async function init() {
const state = await Promise.resolve(initialState)
await Promise.resolve(render(container, state))
// Without setTimeout React does not have committed DOM changes yet, so we don't have the correct elements.
setTimeout(() => {
loadElements()
bindDataCallbacks()
hide()
}, 0)
}
init()
return {
update,
clear,
isOpen,
goDown,
goUp,
handleSubmit,
destroy,
show,
hide,
resetHighlight,
hasHighlight,
getHighlight,
container,
}
}
export type Dropdown<T> = ReturnType<typeof createDropdown<T>>
interface Hit {
item?: string
keyword?: string
url?: string
_redirect?: string
}
export function parseHit(hit: string): Hit {
try {
const parsedHit: Hit | undefined | null = JSON.parse(hit)
return parsedHit ?? {}
} catch (error) {
logger.warn("Could not parse hit", error)
return {}
}
}
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