mirror of
https://github.com/twbs/bootstrap.git
synced 2024-12-04 16:24:22 +01:00
173 lines
4.6 KiB
JavaScript
173 lines
4.6 KiB
JavaScript
/* ========================================================================
|
|
* Bootstrap: scrollspy.js v3.4.1
|
|
* https://getbootstrap.com/docs/3.4/javascript/#scrollspy
|
|
* ========================================================================
|
|
* Copyright 2011-2019 Twitter, Inc.
|
|
* Licensed under MIT (https://github.com/twbs/bootstrap/blob/v3-dev/LICENSE)
|
|
* ======================================================================== */
|
|
|
|
|
|
+function ($) {
|
|
'use strict';
|
|
|
|
// SCROLLSPY CLASS DEFINITION
|
|
// ==========================
|
|
|
|
function ScrollSpy(element, options) {
|
|
this.$body = $(document.body)
|
|
this.$scrollElement = $(element).is(document.body) ? $(window) : $(element)
|
|
this.options = $.extend({}, ScrollSpy.DEFAULTS, options)
|
|
this.selector = (this.options.target || '') + ' .nav li > a'
|
|
this.offsets = []
|
|
this.targets = []
|
|
this.activeTarget = null
|
|
this.scrollHeight = 0
|
|
|
|
this.$scrollElement.on('scroll.bs.scrollspy', $.proxy(this.process, this))
|
|
this.refresh()
|
|
this.process()
|
|
}
|
|
|
|
ScrollSpy.VERSION = '3.4.1'
|
|
|
|
ScrollSpy.DEFAULTS = {
|
|
offset: 10
|
|
}
|
|
|
|
ScrollSpy.prototype.getScrollHeight = function () {
|
|
return this.$scrollElement[0].scrollHeight || Math.max(this.$body[0].scrollHeight, document.documentElement.scrollHeight)
|
|
}
|
|
|
|
ScrollSpy.prototype.refresh = function () {
|
|
var that = this
|
|
var offsetMethod = 'offset'
|
|
var offsetBase = 0
|
|
|
|
this.offsets = []
|
|
this.targets = []
|
|
this.scrollHeight = this.getScrollHeight()
|
|
|
|
if (!$.isWindow(this.$scrollElement[0])) {
|
|
offsetMethod = 'position'
|
|
offsetBase = this.$scrollElement.scrollTop()
|
|
}
|
|
|
|
this.$body
|
|
.find(this.selector)
|
|
.map(function () {
|
|
var $el = $(this)
|
|
var href = $el.data('target') || $el.attr('href')
|
|
var $href = /^#./.test(href) && $(href)
|
|
|
|
return ($href
|
|
&& $href.length
|
|
&& $href.is(':visible')
|
|
&& [[$href[offsetMethod]().top + offsetBase, href]]) || null
|
|
})
|
|
.sort(function (a, b) { return a[0] - b[0] })
|
|
.each(function () {
|
|
that.offsets.push(this[0])
|
|
that.targets.push(this[1])
|
|
})
|
|
}
|
|
|
|
ScrollSpy.prototype.process = function () {
|
|
var scrollTop = this.$scrollElement.scrollTop() + this.options.offset
|
|
var scrollHeight = this.getScrollHeight()
|
|
var maxScroll = this.options.offset + scrollHeight - this.$scrollElement.height()
|
|
var offsets = this.offsets
|
|
var targets = this.targets
|
|
var activeTarget = this.activeTarget
|
|
var i
|
|
|
|
if (this.scrollHeight != scrollHeight) {
|
|
this.refresh()
|
|
}
|
|
|
|
if (scrollTop >= maxScroll) {
|
|
return activeTarget != (i = targets[targets.length - 1]) && this.activate(i)
|
|
}
|
|
|
|
if (activeTarget && scrollTop < offsets[0]) {
|
|
this.activeTarget = null
|
|
return this.clear()
|
|
}
|
|
|
|
for (i = offsets.length; i--;) {
|
|
activeTarget != targets[i]
|
|
&& scrollTop >= offsets[i]
|
|
&& (offsets[i + 1] === undefined || scrollTop < offsets[i + 1])
|
|
&& this.activate(targets[i])
|
|
}
|
|
}
|
|
|
|
ScrollSpy.prototype.activate = function (target) {
|
|
this.activeTarget = target
|
|
|
|
this.clear()
|
|
|
|
var selector = this.selector +
|
|
'[data-target="' + target + '"],' +
|
|
this.selector + '[href="' + target + '"]'
|
|
|
|
var active = $(selector)
|
|
.parents('li')
|
|
.addClass('active')
|
|
|
|
if (active.parent('.dropdown-menu').length) {
|
|
active = active
|
|
.closest('li.dropdown')
|
|
.addClass('active')
|
|
}
|
|
|
|
active.trigger('activate.bs.scrollspy')
|
|
}
|
|
|
|
ScrollSpy.prototype.clear = function () {
|
|
$(this.selector)
|
|
.parentsUntil(this.options.target, '.active')
|
|
.removeClass('active')
|
|
}
|
|
|
|
|
|
// SCROLLSPY PLUGIN DEFINITION
|
|
// ===========================
|
|
|
|
function Plugin(option) {
|
|
return this.each(function () {
|
|
var $this = $(this)
|
|
var data = $this.data('bs.scrollspy')
|
|
var options = typeof option == 'object' && option
|
|
|
|
if (!data) $this.data('bs.scrollspy', (data = new ScrollSpy(this, options)))
|
|
if (typeof option == 'string') data[option]()
|
|
})
|
|
}
|
|
|
|
var old = $.fn.scrollspy
|
|
|
|
$.fn.scrollspy = Plugin
|
|
$.fn.scrollspy.Constructor = ScrollSpy
|
|
|
|
|
|
// SCROLLSPY NO CONFLICT
|
|
// =====================
|
|
|
|
$.fn.scrollspy.noConflict = function () {
|
|
$.fn.scrollspy = old
|
|
return this
|
|
}
|
|
|
|
|
|
// SCROLLSPY DATA-API
|
|
// ==================
|
|
|
|
$(window).on('load.bs.scrollspy.data-api', function () {
|
|
$('[data-spy="scroll"]').each(function () {
|
|
var $spy = $(this)
|
|
Plugin.call($spy, $spy.data())
|
|
})
|
|
})
|
|
|
|
}(jQuery);
|