127 lines
3.8 KiB
JavaScript
127 lines
3.8 KiB
JavaScript
|
/* ========================================================================
|
||
|
|
* Bootstrap: affix.js v3.0.3
|
||
|
|
* http://getbootstrap.com/javascript/#affix
|
||
|
|
* ========================================================================
|
||
|
|
* Copyright 2013 Twitter, Inc.
|
||
|
|
*
|
||
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
|
* you may not use this file except in compliance with the License.
|
||
|
|
* You may obtain a copy of the License at
|
||
|
|
*
|
||
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
*
|
||
|
|
* Unless required by applicable law or agreed to in writing, software
|
||
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
|
* See the License for the specific language governing permissions and
|
||
|
|
* limitations under the License.
|
||
|
|
* ======================================================================== */
|
||
|
|
|
||
|
|
|
||
|
|
+function ($) { "use strict";
|
||
|
|
|
||
|
|
// AFFIX CLASS DEFINITION
|
||
|
|
// ======================
|
||
|
|
|
||
|
|
var Affix = function (element, options) {
|
||
|
|
this.options = $.extend({}, Affix.DEFAULTS, options)
|
||
|
|
this.$window = $(window)
|
||
|
|
.on('scroll.bs.affix.data-api', $.proxy(this.checkPosition, this))
|
||
|
|
.on('click.bs.affix.data-api', $.proxy(this.checkPositionWithEventLoop, this))
|
||
|
|
|
||
|
|
this.$element = $(element)
|
||
|
|
this.affixed =
|
||
|
|
this.unpin = null
|
||
|
|
|
||
|
|
this.checkPosition()
|
||
|
|
}
|
||
|
|
|
||
|
|
Affix.RESET = 'affix affix-top affix-bottom'
|
||
|
|
|
||
|
|
Affix.DEFAULTS = {
|
||
|
|
offset: 0
|
||
|
|
}
|
||
|
|
|
||
|
|
Affix.prototype.checkPositionWithEventLoop = function () {
|
||
|
|
setTimeout($.proxy(this.checkPosition, this), 1)
|
||
|
|
}
|
||
|
|
|
||
|
|
Affix.prototype.checkPosition = function () {
|
||
|
|
if (!this.$element.is(':visible')) return
|
||
|
|
|
||
|
|
var scrollHeight = $(document).height()
|
||
|
|
var scrollTop = this.$window.scrollTop()
|
||
|
|
var position = this.$element.offset()
|
||
|
|
var offset = this.options.offset
|
||
|
|
var offsetTop = offset.top
|
||
|
|
var offsetBottom = offset.bottom
|
||
|
|
|
||
|
|
if (typeof offset != 'object') offsetBottom = offsetTop = offset
|
||
|
|
if (typeof offsetTop == 'function') offsetTop = offset.top()
|
||
|
|
if (typeof offsetBottom == 'function') offsetBottom = offset.bottom()
|
||
|
|
|
||
|
|
var affix = this.unpin != null && (scrollTop + this.unpin <= position.top) ? false :
|
||
|
|
offsetBottom != null && (position.top + this.$element.height() >= scrollHeight - offsetBottom) ? 'bottom' :
|
||
|
|
offsetTop != null && (scrollTop <= offsetTop) ? 'top' : false
|
||
|
|
|
||
|
|
if (this.affixed === affix) return
|
||
|
|
if (this.unpin) this.$element.css('top', '')
|
||
|
|
|
||
|
|
this.affixed = affix
|
||
|
|
this.unpin = affix == 'bottom' ? position.top - scrollTop : null
|
||
|
|
|
||
|
|
this.$element.removeClass(Affix.RESET).addClass('affix' + (affix ? '-' + affix : ''))
|
||
|
|
|
||
|
|
if (affix == 'bottom') {
|
||
|
|
this.$element.offset({ top: document.body.offsetHeight - offsetBottom - this.$element.height() })
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
// AFFIX PLUGIN DEFINITION
|
||
|
|
// =======================
|
||
|
|
|
||
|
|
var old = $.fn.affix
|
||
|
|
|
||
|
|
$.fn.affix = function (option) {
|
||
|
|
return this.each(function () {
|
||
|
|
var $this = $(this)
|
||
|
|
var data = $this.data('bs.affix')
|
||
|
|
var options = typeof option == 'object' && option
|
||
|
|
|
||
|
|
if (!data) $this.data('bs.affix', (data = new Affix(this, options)))
|
||
|
|
if (typeof option == 'string') data[option]()
|
||
|
|
})
|
||
|
|
}
|
||
|
|
|
||
|
|
$.fn.affix.Constructor = Affix
|
||
|
|
|
||
|
|
|
||
|
|
// AFFIX NO CONFLICT
|
||
|
|
// =================
|
||
|
|
|
||
|
|
$.fn.affix.noConflict = function () {
|
||
|
|
$.fn.affix = old
|
||
|
|
return this
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
// AFFIX DATA-API
|
||
|
|
// ==============
|
||
|
|
|
||
|
|
$(window).on('load', function () {
|
||
|
|
$('[data-spy="affix"]').each(function () {
|
||
|
|
var $spy = $(this)
|
||
|
|
var data = $spy.data()
|
||
|
|
|
||
|
|
data.offset = data.offset || {}
|
||
|
|
|
||
|
|
if (data.offsetBottom) data.offset.bottom = data.offsetBottom
|
||
|
|
if (data.offsetTop) data.offset.top = data.offsetTop
|
||
|
|
|
||
|
|
$spy.affix(data)
|
||
|
|
})
|
||
|
|
})
|
||
|
|
|
||
|
|
}(jQuery);
|