scrollspy.js--bug

/**
* 20140505 14.33 ycx
* scrollspy.js中存在的bug！！！---为什么ui.tabs必须在scrollspy.js中的window.onload之前执行，也就是必须在scrollspy初始化之前执行
* 1 scrollspy中的process函数中的scrollTop数值在tabs组件之后的都存在计算错误，是因为scrollspy初始化后，已经计算好整个页面的scrollTop等数组(offsets)，而这时候ui.tabs进行初始化，
* 就会把tab页的其他暂时不显示出来的内容都隐藏起来，就会导致整个页面的scrollTop等方面的数值改变了，所以在tab之后的组件都会在scrollspy中存在偏差！！
* 针对这种情况，临时的解决方法是：
* 方法一： 将ui.tabs()在scrollspy初始化之前执行--如将ui.tabs()放到document.ready回调函数中执行(因为scrollspy是在window.onload回调函数执行的)
* 方法二： 将scrollspy初始化的函数拿出来，在ui.tabs()执行之后再开始初始化。
*
* 2 也就是说，如果其他组件或者js脚本会改变页面的scrollTop等方面的内容，那么估计都要采用上述两种方法来解决。
*/

 

1 ui.js---是我自己写的组件库

2 scrollspy.js可在bootstrap官网下载单独的源文件

scrollspy.js代码，具体如下所示：

  1 /* ========================================================================

  2  * Bootstrap: scrollspy.js v3.0.3

  3  * http://getbootstrap.com/javascript/#scrollspy

  4  * ========================================================================

  5  * Copyright 2013 Twitter, Inc.

  6  *

  7  * Licensed under the Apache License, Version 2.0 (the "License");

  8  * you may not use this file except in compliance with the License.

  9  * You may obtain a copy of the License at

 10  *

 11  * http://www.apache.org/licenses/LICENSE-2.0

 12  *

 13  * Unless required by applicable law or agreed to in writing, software

 14  * distributed under the License is distributed on an "AS IS" BASIS,

 15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 16  * See the License for the specific language governing permissions and

 17  * limitations under the License.

 18  * ======================================================================== */

 19 + function($) {"use strict";

 20 

 21     // SCROLLSPY CLASS DEFINITION

 22     // ==========================

 23 

 24     function ScrollSpy(element, options) {

 25         var href

 26         var process = $.proxy(this.process, this)

 27 

 28         this.$element = $(element).is('body') ? $(window) : $(element)

 29         this.$body = $('body')

 30         this.$scrollElement = this.$element.on('scroll.bs.scroll-spy.data-api', process)

 31         //console.log(this.$scrollElement);

 32         this.options = $.extend({}, ScrollSpy.DEFAULTS, options)

 33         this.selector = (this.options.target || (( href = $(element).attr('href')) && href.replace(/.*(?=#[^\s]+$)/, ''))//strip for ie7

 34         || '') + ' .nav li > a'

 35         //console.log(this.selector);

 36         this.offsets = $([])

 37         this.targets = $([])

 38         this.activeTarget = null

 39 

 40         this.refresh()

 41         this.process()

 42     }

 43 

 44 

 45     ScrollSpy.DEFAULTS = {

 46         offset : 10

 47     }

 48 

 49     ScrollSpy.prototype.refresh = function() {

 50         var offsetMethod = this.$element[0] == window ? 'offset' : 'position'

 51         //console.log(offsetMethod,11);

 52 

 53         this.offsets = $([])

 54         this.targets = $([])

 55 

 56         var self = this

 57         var $targets = this.$body.find(this.selector).map(function() {

 58             var $el = $(this)

 59             var href = $el.data('target') || $el.attr('href')

 60             var $href = /^#\w/.test(href) && $(href)

 61             //console.log($el,"--",href,"--",$href);

 62             console.log($href[offsetMethod]().top, "-------", $href[0].offsetTop, $href[0].id);

 63             //console.log($href,$href["offset"]().top,"-----------");

 64 

 65             return ($href && $href.length && [[$href[offsetMethod]().top + (!$.isWindow(self.$scrollElement.get(0)) && self.$scrollElement.scrollTop()), href]]) || null

 66         }).sort(function(a, b) {

 67             return a[0] - b[0]

 68         }).each(function() {

 69             //console.log(this);

 70             self.offsets.push(this[0])

 71             self.targets.push(this[1])

 72         })

 73     }

 74 

 75     ScrollSpy.prototype.process = function() {

 76         //这里存在问题--scrollTop

 77         var scrollTop = this.$scrollElement.scrollTop() + this.options.offset

 78         console.log("scrollTop--->>>" + scrollTop);

 79         var scrollHeight = this.$scrollElement[0].scrollHeight || this.$body[0].scrollHeight

 80         var maxScroll = scrollHeight - this.$scrollElement.height()

 81         var offsets = this.offsets

 82         //console.log(offsets);

 83         var targets = this.targets

 84         var activeTarget = this.activeTarget

 85         var i

 86 

 87         if (scrollTop >= maxScroll) {

 88             return activeTarget != ( i = targets.last()[0]) && this.activate(i)

 89         }

 90 

 91         //console.log(scrollTop,offsets,)

 92 

 93         for ( i = offsets.length; i--; ) {

 94             //activeTarget != targets[i] && scrollTop >= offsets[i] && (!offsets[i + 1] || scrollTop <= offsets[i + 1]) && this.activate(targets[i])

 95 

 96             //activeTarget != targets[i] && scrollTop >= offsets[i] && (!offsets[i + 1] || scrollTop <= offsets[i + 1]) && this.activate(targets[i+1])

 97             activeTarget != targets[i] && scrollTop >= offsets[i] && (!offsets[i + 1] || scrollTop <= offsets[i + 1]) && this.activate(targets[i])

 98         }

 99     }

100 

101     ScrollSpy.prototype.activate = function(target) {

102         console.log("target===>>>", target);

103         this.activeTarget = target;

104 

105         $(this.selector).parents('.active').removeClass('active')

106 

107         var selector = this.selector + '[data-target="' + target + '"],' + this.selector + '[href="' + target + '"]'

108 

109         var active = $(selector).parents('li').addClass('active')

110 

111         if (active.parent('.dropdown-menu').length) {

112             active = active.closest('li.dropdown').addClass('active')

113         }

114 

115         active.trigger('activate.bs.scrollspy')

116     }

117     // SCROLLSPY PLUGIN DEFINITION

118     // ===========================

119 

120     var old = $.fn.scrollspy;

121 

122     $.fn.scrollspy = function(option) {

123         return this.each(function() {

124             var $this = $(this)

125             var data = $this.data('bs.scrollspy')

126             var options = typeof option == 'object' && option

127 

128             if (!data)

129                 $this.data('bs.scrollspy', ( data = new ScrollSpy(this, options)))

130             if ( typeof option == 'string')

131                 data[option]()

132         })

133     }

134 

135     $.fn.scrollspy.Constructor = ScrollSpy;

136 

137     // SCROLLSPY NO CONFLICT

138     // =====================

139 

140     $.fn.scrollspy.noConflict = function() {

141         $.fn.scrollspy = old;

142         return this;

143     }

144     // SCROLLSPY DATA-API

145     // ==================

146 

147     $(window).on('load', function() {

148         $('[data-spy="scroll"]').each(function() {

149             var $spy = $(this);

150             $spy.scrollspy($spy.data());

151         })

152     })

153 }(jQuery);