mirror of https://github.com/twbs/bootstrap.git
151 lines
4.3 KiB
JavaScript
151 lines
4.3 KiB
JavaScript
/* =============================================================
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* bootstrap-scrollspy.js v2.0.4
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* http://twitter.github.com/bootstrap/javascript.html#scrollspy
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* =============================================================
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* Copyright 2012 Twitter, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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* ============================================================== */
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!function ($) {
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"use strict"; // jshint ;_;
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/* SCROLLSPY CLASS DEFINITION
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* ========================== */
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function ScrollSpy( element, options) {
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var process = $.proxy(this.process, this)
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, $element = $(element).is('body') ? $(window) : $(element)
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, href
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this.options = $.extend({}, $.fn.scrollspy.defaults, options)
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this.$scrollElement = $element.on('scroll.scroll.data-api', process)
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this.selector = (this.options.target
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|| ((href = $(element).attr('href')) && href.replace(/.*(?=#[^\s]+$)/, '')) //strip for ie7
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|| '') + ' .nav li > a'
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this.$body = $('body')
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this.refresh()
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this.process()
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}
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ScrollSpy.prototype = {
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constructor: ScrollSpy
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, refresh: function () {
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var self = this
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, $targets
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this.offsets = $([])
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this.targets = $([])
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$targets = this.$body
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.find(this.selector)
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.map(function () {
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var $el = $(this)
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, href = $el.data('target') || $el.attr('href')
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, $href = /^#\w/.test(href) && $(href)
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return ( $href
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&& $href.length
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&& [[ $href.position().top, href ]] ) || null
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})
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.sort(function (a, b) { return a[0] - b[0] })
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.each(function () {
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self.offsets.push(this[0])
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self.targets.push(this[1])
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})
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}
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, process: function () {
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var scrollTop = this.$scrollElement.scrollTop() + this.options.offset
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, scrollHeight = this.$scrollElement[0].scrollHeight || this.$body[0].scrollHeight
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, maxScroll = scrollHeight - this.$scrollElement.height()
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, offsets = this.offsets
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, targets = this.targets
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, activeTarget = this.activeTarget
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, i
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if (scrollTop >= maxScroll) {
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return activeTarget != (i = targets.last()[0])
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&& this.activate ( i )
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}
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for (i = offsets.length; i--;) {
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activeTarget != targets[i]
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&& scrollTop >= offsets[i]
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&& (!offsets[i + 1] || scrollTop <= offsets[i + 1])
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&& this.activate( targets[i] )
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}
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}
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, activate: function (target) {
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var active
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, selector
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this.activeTarget = target
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$(this.selector)
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.parent('.active')
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.removeClass('active')
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selector = this.selector
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+ '[data-target="' + target + '"],'
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+ this.selector + '[href="' + target + '"]'
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active = $(selector)
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.parent('li')
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.addClass('active')
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if (active.parent('.dropdown-menu').length) {
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active = active.closest('li.dropdown').addClass('active')
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}
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active.trigger('activate')
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}
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}
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/* SCROLLSPY PLUGIN DEFINITION
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* =========================== */
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$.fn.scrollspy = function ( option ) {
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return this.each(function () {
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var $this = $(this)
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, data = $this.data('scrollspy')
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, options = typeof option == 'object' && option
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if (!data) $this.data('scrollspy', (data = new ScrollSpy(this, options)))
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if (typeof option == 'string') data[option]()
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})
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}
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$.fn.scrollspy.Constructor = ScrollSpy
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$.fn.scrollspy.defaults = {
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offset: 10
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}
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/* SCROLLSPY DATA-API
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* ================== */
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$(function () {
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$('[data-spy="scroll"]').each(function () {
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var $spy = $(this)
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$spy.scrollspy($spy.data())
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})
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})
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}(window.jQuery); |