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import { optionElementOfData, dataObjectOfOption } from '../../utils/option-data.js'
import { containerEl, getDynamicOptions } from '../../utils/dynamic-select-dom.js'
/** @import {DynamicSelect} from '../../utils/dynamic-select-dom.js' */
/** @import {OptionData} from '../../utils/option-data.js' */
/** @type {WeakMap<DynamicSelect, DynamicOptionsData>} */
const dataLoaderData = new WeakMap()
/**
* @param {DynamicSelect} element - target element
* @returns {DynamicOptionsData} dataloader of element
*/
export function dynamicOptionsOf (element) {
let dataLoader = dataLoaderData.get(element)
if (!dataLoader) {
dataLoader = createDynamicOptionsDataFor(new WeakRef(element))
dataLoaderData.set(element, dataLoader)
}
return dataLoader
}
/**
* Creates a dataloader for an element
* @param {WeakRef<DynamicSelect>} elementRef - weak reference of element. We do not want to have any strong reference chain pointing to
* globally allocated `dataLoaderData`, effectively creating a memory leak
* @returns {DynamicOptionsData} - created dataloader for element
*/
function createDynamicOptionsDataFor (elementRef) {
const getElement = () => {
const element = elementRef.deref()
if (!element) { throw Error('element no longer exists') }
return element
}
/** @type {DynamicOptionsData} */
const api = {
selectedValues: new Set(),
get options () {
return [...getDynamicOptions(getElement()).querySelectorAll(':scope > option')]
},
get optionsData () {
return api.options.map(option => Object.freeze({ ...dataObjectOfOption(option), origin: 'fetch' }))
},
get optionsMap () {
return Object.fromEntries(api.options.map(option => [option.value, option]))
},
status: 'empty',
loadData: () => loadData(getElement()),
loadNextData: () => loadNextData(getElement()),
get values () {
return Iterator.from(api.options)
.filter(option => option.selected)
.map(option => option.value)
.toArray()
},
set values (values) {
api.selectedValues = new Set(...values)
api.options.forEach(option => { option.selected = values.includes(option.value) })
},
toggleValue (value, force) {
const selected = force == null ? !api.selectedValues.has(value) : force
if (selected) {
api.selectedValues.delete(value)
} else {
api.selectedValues.add(value)
}
Iterator.from(api.options)
.filter(option => option.value === value)
.forEach(option => { option.selected = selected })
},
get selectedOptions () {
return Iterator.from(api.options)
.filter(option => option.selected)
.toArray()
},
}
return api
}
/**
* Loads data of dynamic select. Loads first page if paginated
* @param {DynamicSelect} element - target dynamic select element
*/
async function loadData (element) {
const loader = dataLoaderOf(element)
const dynamicOptionsElement = getDynamicOptions(element)
const container = containerEl(element)
try {
const fetchData = loader.fetchData()
const isAsync = loader.fetchHistory.at(-1)?.loadingMode === 'async'
container.setAttribute('load-mode', isAsync ? 'async' : 'sync')
container.toggleAttribute('data-loading', isAsync)
const result = await fetchData
const api = dynamicOptionsOf(element)
const { selectedValues } = api
const optionsMap = api.optionsMap
for (const data of result.data) {
const objectData = dataObjectOfData(data, selectedValues)
if (optionsMap[objectData.value] == null) {
dynamicOptionsElement.append(optionElementOfData(objectData))
}
}
} catch (e) {
console.error(e)
} finally {
container.removeAttribute('data-loading')
}
}
/**
* Loads next page.
* @param {DynamicSelect} element - target dynamic select element
*/
async function loadNextData (element) {
const loader = dataLoaderOf(element)
const dynamicOptionsElement = getDynamicOptions(element)
try {
const result = await loader.fetchNextData()
const api = dynamicOptionsOf(element)
const { selectedValues } = api
const optionsMap = api.optionsMap
for (const data of result.data) {
const objectData = dataObjectOfData(data, selectedValues)
if (optionsMap[objectData.value] == null) {
dynamicOptionsElement.append(optionElementOfData(objectData))
}
}
} catch (e) {
console.error(e)
}
}
/**
* get data object of option in a JSON represented format
*
* @param {*} optionData - target element in shadow DOM
* @param {Set<string>} selectedValues - target element in shadow DOM
* @returns {OptionData} option data
*/
export function dataObjectOfData (optionData, selectedValues) {
const value = String(optionData.value)
return {
value,
text: optionData.text ?? value,
selected: selectedValues.has(value),
origin: 'fetch',
data: optionData,
}
}
/**
* get data object of option in a JSON represented format
*
* @param {OptionData} optionData - target element in shadow DOM
* @param {Set<string>} selectedValues - target element in shadow DOM
* @returns {HTMLOptionElement} option data
*/
export function optionFromData (optionData, selectedValues) {
const option = optionElementOfData(optionData)
option.selected = selectedValues.has(optionData.value)
return option
}
/**
* @typedef {object} DynamicOptionsData
*
* Manages dynamic select's dynamically generated options, be it by fetching it
* from an URL or other source, such as calling `details.respondWith()` on
* "fetch" event
*
* @property {HTMLOptionElement[]} options - List of dynamically generated options
* @property {OptionData[]} optionsData - `options` mapped to data
* @property {Set<string>} selectedValues - Dynamically selected values, does not reflect 100% to values:
* you can set any list of values on the selected values, but if the option does not exist it will
* be excluded on the `values`. When the option exists (is loaded asynchronously), the it will be
* it will be automatically added to `values`
* @property {{[k: string]: HTMLOptionElement}} optionsMap - Map of value to HTMLOptionElement
* @property {"loading"|"paginated"|"fullyLoaded"|"empty"} status Dynamic options state:
* - `"loading"`: loading data
* - `"paginated"`: data loaded and has a next page
* - `"fullyLoaded"`: data loaded. All pages are loaded if paginated
* - `"empty"`: no data loaded at all
* @property {() => Promise<void>} loadData - loads data of dynamic select. Loads first page if paginated
* @property {() => Promise<void>} loadNextData - Loads next page. Only used in paginated data.
* @property {string[]} values - values applied to select
* @property {HTMLOptionElement[]} selectedOptions - selected option elements
* @property {(value: string, selected?: boolean) => void} toggleValue - toggle value of select
*/
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