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Johann-S authoredfee11fd7
/** * -------------------------------------------------------------------------- * Bootstrap (v4.3.1): scrollspy.js * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE) * -------------------------------------------------------------------------- */import Data from './dom/data'import EventHandler from './dom/eventHandler'import Manipulator from './dom/manipulator'import SelectorEngine from './dom/selectorEngine'import Util from './util'/** * ------------------------------------------------------------------------ * Constants * ------------------------------------------------------------------------ */const NAME = 'scrollspy'const VERSION = '4.3.1'const DATA_KEY = 'bs.scrollspy'const EVENT_KEY = `.${DATA_KEY}`const DATA_API_KEY = '.data-api'const Default = { offset : 10, method : 'auto', target : ''}const DefaultType = { offset : 'number', method : 'string', target : '(string|element)'}const Event = { ACTIVATE : `activate${EVENT_KEY}`, SCROLL : `scroll${EVENT_KEY}`, LOAD_DATA_API : `load${EVENT_KEY}${DATA_API_KEY}`}const ClassName = { DROPDOWN_ITEM : 'dropdown-item', DROPDOWN_MENU : 'dropdown-menu', ACTIVE : 'active'}const Selector = { DATA_SPY : '[data-spy="scroll"]', ACTIVE : '.active', NAV_LIST_GROUP : '.nav, .list-group', NAV_LINKS : '.nav-link', NAV_ITEMS : '.nav-item', LIST_ITEMS : '.list-group-item', DROPDOWN : '.dropdown', DROPDOWN_ITEMS : '.dropdown-item', DROPDOWN_TOGGLE : '.dropdown-toggle'}const OffsetMethod = { OFFSET : 'offset', POSITION : 'position'}/** * ------------------------------------------------------------------------ * Class Definition * ------------------------------------------------------------------------7172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140
*/
class ScrollSpy {
constructor(element, config) {
this._element = element
this._scrollElement = element.tagName === 'BODY' ? window : element
this._config = this._getConfig(config)
this._selector = `${this._config.target} ${Selector.NAV_LINKS},` +
`${this._config.target} ${Selector.LIST_ITEMS},` +
`${this._config.target} ${Selector.DROPDOWN_ITEMS}`
this._offsets = []
this._targets = []
this._activeTarget = null
this._scrollHeight = 0
EventHandler.on(this._scrollElement, Event.SCROLL, (event) => this._process(event))
this.refresh()
this._process()
Data.setData(element, DATA_KEY, this)
}
// Getters
static get VERSION() {
return VERSION
}
static get Default() {
return Default
}
// Public
refresh() {
const autoMethod = this._scrollElement === this._scrollElement.window
? OffsetMethod.OFFSET : OffsetMethod.POSITION
const offsetMethod = this._config.method === 'auto'
? autoMethod : this._config.method
const offsetBase = offsetMethod === OffsetMethod.POSITION
? this._getScrollTop() : 0
this._offsets = []
this._targets = []
this._scrollHeight = this._getScrollHeight()
const targets = Util.makeArray(SelectorEngine.find(this._selector))
targets
.map((element) => {
let target
const targetSelector = Util.getSelectorFromElement(element)
if (targetSelector) {
target = SelectorEngine.findOne(targetSelector)
}
if (target) {
const targetBCR = target.getBoundingClientRect()
if (targetBCR.width || targetBCR.height) {
// TODO (fat): remove sketch reliance on jQuery position/offset
return [
Manipulator[offsetMethod](target).top + offsetBase,
targetSelector
]
}
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}
return null
})
.filter((item) => item)
.sort((a, b) => a[0] - b[0])
.forEach((item) => {
this._offsets.push(item[0])
this._targets.push(item[1])
})
}
dispose() {
Data.removeData(this._element, DATA_KEY)
EventHandler.off(this._scrollElement, EVENT_KEY)
this._element = null
this._scrollElement = null
this._config = null
this._selector = null
this._offsets = null
this._targets = null
this._activeTarget = null
this._scrollHeight = null
}
// Private
_getConfig(config) {
config = {
...Default,
...typeof config === 'object' && config ? config : {}
}
if (typeof config.target !== 'string') {
let id = config.target.id
if (!id) {
id = Util.getUID(NAME)
config.target.id = id
}
config.target = `#${id}`
}
Util.typeCheckConfig(NAME, config, DefaultType)
return config
}
_getScrollTop() {
return this._scrollElement === window
? this._scrollElement.pageYOffset : this._scrollElement.scrollTop
}
_getScrollHeight() {
return this._scrollElement.scrollHeight || Math.max(
document.body.scrollHeight,
document.documentElement.scrollHeight
)
}
_getOffsetHeight() {
return this._scrollElement === window
? window.innerHeight : this._scrollElement.getBoundingClientRect().height
}
_process() {
const scrollTop = this._getScrollTop() + this._config.offset
const scrollHeight = this._getScrollHeight()
const maxScroll = this._config.offset +
scrollHeight -
this._getOffsetHeight()
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if (this._scrollHeight !== scrollHeight) {
this.refresh()
}
if (scrollTop >= maxScroll) {
const target = this._targets[this._targets.length - 1]
if (this._activeTarget !== target) {
this._activate(target)
}
return
}
if (this._activeTarget && scrollTop < this._offsets[0] && this._offsets[0] > 0) {
this._activeTarget = null
this._clear()
return
}
const offsetLength = this._offsets.length
for (let i = offsetLength; i--;) {
const isActiveTarget = this._activeTarget !== this._targets[i] &&
scrollTop >= this._offsets[i] &&
(typeof this._offsets[i + 1] === 'undefined' ||
scrollTop < this._offsets[i + 1])
if (isActiveTarget) {
this._activate(this._targets[i])
}
}
}
_activate(target) {
this._activeTarget = target
this._clear()
const queries = this._selector.split(',')
.map((selector) => `${selector}[data-target="${target}"],${selector}[href="${target}"]`)
const link = SelectorEngine.findOne(queries.join(','))
if (link.classList.contains(ClassName.DROPDOWN_ITEM)) {
SelectorEngine
.findOne(Selector.DROPDOWN_TOGGLE, SelectorEngine.closest(link, Selector.DROPDOWN))
.classList.add(ClassName.ACTIVE)
link.classList.add(ClassName.ACTIVE)
} else {
// Set triggered link as active
link.classList.add(ClassName.ACTIVE)
SelectorEngine
.parents(link, Selector.NAV_LIST_GROUP)
.forEach((listGroup) => {
// Set triggered links parents as active
// With both <ul> and <nav> markup a parent is the previous sibling of any nav ancestor
SelectorEngine.prev(listGroup, `${Selector.NAV_LINKS}, ${Selector.LIST_ITEMS}`)
.forEach((item) => item.classList.add(ClassName.ACTIVE))
// Handle special case when .nav-link is inside .nav-item
SelectorEngine.prev(listGroup, Selector.NAV_ITEMS)
.forEach((navItem) => {
SelectorEngine.children(navItem, Selector.NAV_LINKS)
.forEach((item) => item.classList.add(ClassName.ACTIVE))
})
})
}
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EventHandler.trigger(this._scrollElement, Event.ACTIVATE, {
relatedTarget: target
})
}
_clear() {
Util.makeArray(SelectorEngine.find(this._selector))
.filter((node) => node.classList.contains(ClassName.ACTIVE))
.forEach((node) => node.classList.remove(ClassName.ACTIVE))
}
// Static
static _jQueryInterface(config) {
return this.each(function () {
let data = Data.getData(this, DATA_KEY)
const _config = typeof config === 'object' && config
if (!data) {
data = new ScrollSpy(this, _config)
}
if (typeof config === 'string') {
if (typeof data[config] === 'undefined') {
throw new TypeError(`No method named "${config}"`)
}
data[config]()
}
})
}
static _getInstance(element) {
return Data.getData(element, DATA_KEY)
}
}
/**
* ------------------------------------------------------------------------
* Data Api implementation
* ------------------------------------------------------------------------
*/
EventHandler.on(window, Event.LOAD_DATA_API, () => {
Util.makeArray(SelectorEngine.find(Selector.DATA_SPY))
.forEach((spy) => new ScrollSpy(spy, Manipulator.getDataAttributes(spy)))
})
/**
* ------------------------------------------------------------------------
* jQuery
* ------------------------------------------------------------------------
*/
const $ = Util.jQuery
if (typeof $ !== 'undefined') {
const JQUERY_NO_CONFLICT = $.fn[NAME]
$.fn[NAME] = ScrollSpy._jQueryInterface
$.fn[NAME].Constructor = ScrollSpy
$.fn[NAME].noConflict = () => {
$.fn[NAME] = JQUERY_NO_CONFLICT
return ScrollSpy._jQueryInterface
}
}
export default ScrollSpy