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annotate static/bootstrap/js/bootstrap-affix.js @ 61:130eccd396d8

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Now using Boostrap with LESS.
author Ludovic Chabant <ludovic@chabant.com>
date Wed, 06 Feb 2013 08:22:31 -0800
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children a5a3d454eac9
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61
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1 /* ==========================================================
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2 * bootstrap-affix.js v2.2.2
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3 * http://twitter.github.com/bootstrap/javascript.html#affix
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4 * ==========================================================
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5 * Copyright 2012 Twitter, Inc.
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6 *
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7 * Licensed under the Apache License, Version 2.0 (the "License");
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8 * you may not use this file except in compliance with the License.
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9 * You may obtain a copy of the License at
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10 *
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11 * http://www.apache.org/licenses/LICENSE-2.0
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12 *
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13 * Unless required by applicable law or agreed to in writing, software
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14 * distributed under the License is distributed on an "AS IS" BASIS,
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15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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16 * See the License for the specific language governing permissions and
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17 * limitations under the License.
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18 * ========================================================== */
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19
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20
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21 !function ($) {
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22
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23 "use strict"; // jshint ;_;
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24
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25
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26 /* AFFIX CLASS DEFINITION
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27 * ====================== */
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28
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29 var Affix = function (element, options) {
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30 this.options = $.extend({}, $.fn.affix.defaults, options)
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31 this.$window = $(window)
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32 .on('scroll.affix.data-api', $.proxy(this.checkPosition, this))
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33 .on('click.affix.data-api', $.proxy(function () { setTimeout($.proxy(this.checkPosition, this), 1) }, this))
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34 this.$element = $(element)
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35 this.checkPosition()
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36 }
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37
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38 Affix.prototype.checkPosition = function () {
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39 if (!this.$element.is(':visible')) return
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40
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41 var scrollHeight = $(document).height()
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42 , scrollTop = this.$window.scrollTop()
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43 , position = this.$element.offset()
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44 , offset = this.options.offset
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45 , offsetBottom = offset.bottom
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46 , offsetTop = offset.top
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47 , reset = 'affix affix-top affix-bottom'
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48 , affix
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49
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50 if (typeof offset != 'object') offsetBottom = offsetTop = offset
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51 if (typeof offsetTop == 'function') offsetTop = offset.top()
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52 if (typeof offsetBottom == 'function') offsetBottom = offset.bottom()
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53
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54 affix = this.unpin != null && (scrollTop + this.unpin <= position.top) ?
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55 false : offsetBottom != null && (position.top + this.$element.height() >= scrollHeight - offsetBottom) ?
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56 'bottom' : offsetTop != null && scrollTop <= offsetTop ?
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57 'top' : false
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58
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59 if (this.affixed === affix) return
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60
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61 this.affixed = affix
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62 this.unpin = affix == 'bottom' ? position.top - scrollTop : null
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63
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64 this.$element.removeClass(reset).addClass('affix' + (affix ? '-' + affix : ''))
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65 }
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66
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67
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68 /* AFFIX PLUGIN DEFINITION
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69 * ======================= */
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70
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71 var old = $.fn.affix
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72
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73 $.fn.affix = function (option) {
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74 return this.each(function () {
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75 var $this = $(this)
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76 , data = $this.data('affix')
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77 , options = typeof option == 'object' && option
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78 if (!data) $this.data('affix', (data = new Affix(this, options)))
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79 if (typeof option == 'string') data[option]()
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80 })
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81 }
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82
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83 $.fn.affix.Constructor = Affix
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84
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85 $.fn.affix.defaults = {
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86 offset: 0
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87 }
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88
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89
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90 /* AFFIX NO CONFLICT
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91 * ================= */
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92
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93 $.fn.affix.noConflict = function () {
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94 $.fn.affix = old
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95 return this
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96 }
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97
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98
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99 /* AFFIX DATA-API
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100 * ============== */
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101
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102 $(window).on('load', function () {
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103 $('[data-spy="affix"]').each(function () {
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104 var $spy = $(this)
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105 , data = $spy.data()
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106
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107 data.offset = data.offset || {}
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108
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109 data.offsetBottom && (data.offset.bottom = data.offsetBottom)
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110 data.offsetTop && (data.offset.top = data.offsetTop)
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111
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112 $spy.affix(data)
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113 })
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114 })
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115
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116
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117 }(window.jQuery);