mirror of https://github.com/twbs/bootstrap.git
105 lines
2.9 KiB
JavaScript
105 lines
2.9 KiB
JavaScript
/* =============================================================
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* bootstrap-scrollspy.js
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* http://twitter.github.com/bootstrap/javascript.html#scrollspy
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* =============================================================
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* Copyright 2011 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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var $window = $(window)
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function ScrollSpy( topbar, selector ) {
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var processScroll = $.proxy(this.processScroll, this)
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this.$topbar = $(topbar)
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this.selector = selector || 'li > a'
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this.refresh()
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this.$topbar.delegate(this.selector, 'click', processScroll)
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$window.scroll(processScroll)
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this.processScroll()
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}
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ScrollSpy.prototype = {
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refresh: function () {
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this.targets = this.$topbar.find(this.selector).map(function () {
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var href = $(this).attr('href')
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return /^#\w/.test(href) && $(href).length ? href : null
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})
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this.offsets = $.map(this.targets, function (id) {
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return $(id).offset().top
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})
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}
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, processScroll: function () {
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var scrollTop = $window.scrollTop() + 10
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, offsets = this.offsets
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, targets = this.targets
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, activeTarget = this.activeTarget
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, i
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for (i = offsets.length; i--;) {
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activeTarget != targets[i]
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&& scrollTop >= offsets[i]
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&& (!offsets[i + 1] || scrollTop <= offsets[i + 1])
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&& this.activateButton( targets[i] )
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}
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}
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, activateButton: function (target) {
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this.activeTarget = target
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this.$topbar
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.find(this.selector).parent('.active')
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.removeClass('active')
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this.$topbar
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.find(this.selector + '[href="' + target + '"]')
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.parent('li')
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.addClass('active')
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}
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}
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/* SCROLLSPY PLUGIN DEFINITION
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* =========================== */
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$.fn.scrollSpy = function( options ) {
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var scrollspy = this.data('scrollspy')
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if (!scrollspy) {
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return this.each(function () {
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$(this).data('scrollspy', new ScrollSpy( this, options ))
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})
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}
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if ( options === true ) {
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return scrollspy
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}
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if ( typeof options == 'string' ) {
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scrollspy[options]()
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}
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return this
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}
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$(function () {
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$('body').scrollSpy('[data-scrollspy] li > a')
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})
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}( jQuery || ender ) |