/* ========================================================================
* Bootstrap: tooltip.js v3.3.7
* http://getbootstrap.com/javascript/#tooltip
* Inspired by the original jQuery.tipsy by Jason Frame
* ========================================================================
* Copyright 2011-2016 Twitter, Inc.
* Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
* ======================================================================== */
+function ($) {
'use strict';
// TOOLTIP PUBLIC CLASS DEFINITION
// ===============================
var Tooltip = function (element, options) {//tooltip 构造函数 element：当前dom元素 options：一般是false（除非option是对象）
this.type = null
this.options = null
this.enabled = null
this.timeout = null
this.hoverState = null
this.$element = null
this.inState = null
this.init('tooltip', element, options)//在构造函数中直接初始化 这里传入tooltip 可能是为了扩展
}
Tooltip.VERSION = '3.3.7'
Tooltip.TRANSITION_DURATION = 150 //过度时间
Tooltip.DEFAULTS = {//默认配置
animation: true,
placement: 'top',
selector: false,
template: '<div class="tooltip" role="tooltip"><div class="tooltip-arrow"></div><div class="tooltip-inner"></div></div>',
trigger: 'hover focus',
title: '',
delay: 0,
html: false,
container: false,
viewport: {
selector: 'body',
padding: 0
}
}
Tooltip.prototype.init = function (type, element, options) {//初始化
this.enabled = true
this.type = type //tooltip
this.$element = $(element)
this.options = this.getOptions(options)//合并参数：DEFAULTS ，data- he options 然后返回，噢还有daly
//function: 传入elemlent，object：传入sleector或 paddding 二元表达式是在$()里进行的 $viewport为jquery元素
this.$viewport = this.options.viewport && $($.isFunction(this.options.viewport) ? this.options.viewport.call(this, this.$element) : (this.options.viewport.selector || this.options.viewport))
this.inState = { click: false, hover: false, focus: false }//默认是这样的，？？？？往下看
if (this.$element[0] instanceof document.constructor && !this.options.selector) {//不能是document的实例，即不能是document对象，那么手动出错
throw new Error('`selector` option must be specified when initializing ' + this.type + ' on the window.document object!')
}
var triggers = this.options.trigger.split(' ')//把触发条件弄成数组 ['hover','foxus'] 这是默认的配置
for (var i = triggers.length; i--;) {//注册事件：默认的话是注册hover focus 对应的事件 监听函数为this.enter和this.leave ，也可以注册click：监听函数为this.toggle
var trigger = triggers[i]
if (trigger == 'click') {
this.$element.on('click.' + this.type, this.options.selector, $.proxy(this.toggle, this))
} else if (trigger != 'manual') {
var eventIn = trigger == 'hover' ? 'mouseenter' : 'focusin'
var eventOut = trigger == 'hover' ? 'mouseleave' : 'focusout'
this.$element.on(eventIn + '.' + this.type, this.options.selector, $.proxy(this.enter, this))
this.$element.on(eventOut + '.' + this.type, this.options.selector, $.proxy(this.leave, this))
}
}
this.options.selector ?
(this._options = $.extend({}, this.options, { trigger: 'manual', selector: '' })) :
this.fixTitle()
}
Tooltip.prototype.getDefaults = function () {
return Tooltip.DEFAULTS
}
Tooltip.prototype.getOptions = function (options) {
options = $.extend({}, this.getDefaults(), this.$element.data(), options)//主要是参数合并
if (options.delay && typeof options.delay == 'number') {//延迟的话，把delay初始化为对象
options.delay = {
show: options.delay,
hide: options.delay
}
}
return options
}
Tooltip.prototype.getDelegateOptions = function () {
var options = {}
var defaults = this.getDefaults()
this._options && $.each(this._options, function (key, value) {
if (defaults[key] != value) options[key] = value
})
return options
}
Tooltip.prototype.enter = function (obj) {//tooltip触发时候的执行方法
var self = obj instanceof this.constructor ?
obj : $(obj.currentTarget).data('bs.' + this.type)
if (!self) {//什么时候为null先不管，先往下看
self = new this.constructor(obj.currentTarget, this.getDelegateOptions())
$(obj.currentTarget).data('bs.' + this.type, self)
}
if (obj instanceof $.Event) {//obj是$.Event的实例的话执行，就是obj是不是事件对象
self.inState[obj.type == 'focusin' ? 'focus' : 'hover'] = true //把触发的状态搞成true，（默认是false）
}
if (self.tip().hasClass('in') || self.hoverState == 'in') {//有in class 或 hoverState 为in 即已经显示了所以返回 但是无论怎么样都会初始化self.$tip
self.hoverState = 'in'
return
}
clearTimeout(self.timeout)//清除定时器
self.hoverState = 'in'//改为in 因为已经开始让tooltip显示了
if (!self.options.delay || !self.options.delay.show) return self.show()//不延迟的话直接调用show方法，否则执行下面的定时器进行延迟
self.timeout = setTimeout(function () {//进行延迟
if (self.hoverState == 'in') self.show()
}, self.options.delay.show)
}
Tooltip.prototype.isInStateTrue = function () {
for (var key in this.inState) {
if (this.inState[key]) return true
}
return false
}
Tooltip.prototype.leave = function (obj) {
var self = obj instanceof this.constructor ?
obj : $(obj.currentTarget).data('bs.' + this.type)
if (!self) {
self = new this.constructor(obj.currentTarget, this.getDelegateOptions())
$(obj.currentTarget).data('bs.' + this.type, self)
}
if (obj instanceof $.Event) {
self.inState[obj.type == 'focusout' ? 'focus' : 'hover'] = false
}
if (self.isInStateTrue()) return
clearTimeout(self.timeout)
self.hoverState = 'out'
if (!self.options.delay || !self.options.delay.hide) return self.hide()
self.timeout = setTimeout(function () {
if (self.hoverState == 'out') self.hide()
}, self.options.delay.hide)
}
Tooltip.prototype.show = function () {
var e = $.Event('show.bs.' + this.type)
if (this.hasContent() && this.enabled) {//有title数据的时候才执行显示工作
this.$element.trigger(e)//触发show事件，但还没插入文档所以不会显示，往下看
var inDom = $.contains(this.$element[0].ownerDocument.documentElement, this.$element[0])//判断是否在文档中 ？不太懂，先放下
if (e.isDefaultPrevented() || !inDom) return//默认已经取消 或者是不在dom中
var that = this
var $tip = this.tip()//得到tootle的jquery对象
var tipId = this.getUID(this.type)//为tip创建一个id（内部集成了去重处理），
this.setContent()//设置 为$tip里填充title数据
$tip.attr('id', tipId)//设置id（因为都是一个对象引用，从哪里设置都一样）
this.$element.attr('aria-describedby', tipId)//设置一个标记
if (this.options.animation) $tip.addClass('fade')
var placement = typeof this.options.placement == 'function' ?//提取显示方向
this.options.placement.call(this, $tip[0], this.$element[0]) :
this.options.placement
var autoToken = /\s?auto?\s?/i
var autoPlace = autoToken.test(placement)//判断方向是否是auto
if (autoPlace) placement = placement.replace(autoToken, '') || 'top'//有auto的话为top
$tip
.detach()//从dom结构中删除，但是不冲jquery对象中删除
.css({ top: 0, left: 0, display: 'block' })//设置基本的css属性，先让定位在左上角
.addClass(placement)
.data('bs.' + this.type, this)
this.options.container ? $tip.appendTo(this.options.container) : $tip.insertAfter(this.$element)//默认加在触发元素的后面，到目前，在$element后已经可以看到dom元素（按f12看）现在在左上角上，但是透明度为0（即看不到）
this.$element.trigger('inserted.bs.' + this.type)//这是一个不确定的事件
var pos = this.getPosition()//
var actualWidth = $tip[0].offsetWidth//
var actualHeight = $tip[0].offsetHeight//
if (autoPlace) {//auto 的情况
var orgPlacement = placement
var viewportDim = this.getPosition(this.$viewport)
placement = placement == 'bottom' && pos.bottom + actualHeight > viewportDim.bottom ? 'top' :
placement == 'top' && pos.top - actualHeight < viewportDim.top ? 'bottom' :
placement == 'right' && pos.right + actualWidth > viewportDim.width ? 'left' :
placement == 'left' && pos.left - actualWidth < viewportDim.left ? 'right' :
placement
$tip
.removeClass(orgPlacement)
.addClass(placement)
}
var calculatedOffset = this.getCalculatedOffset(placement, pos, actualWidth, actualHeight)//计算toop该在哪个位置显示
this.applyPlacement(calculatedOffset, placement)//把计算后的状态应用到实际
var complete = function () {
var prevHoverState = that.hoverState
that.$element.trigger('shown.bs.' + that.type)
that.hoverState = null
if (prevHoverState == 'out') that.leave(that)
}
$.support.transition && this.$tip.hasClass('fade') ?
$tip
.one('bsTransitionEnd', complete)
.emulateTransitionEnd(Tooltip.TRANSITION_DURATION) :
complete()
}
}
Tooltip.prototype.applyPlacement = function (offset, placement) {
var $tip = this.tip()
var width = $tip[0].offsetWidth
var height = $tip[0].offsetHeight
// manually read margins because getBoundingClientRect includes difference
var marginTop = parseInt($tip.css('margin-top'), 10)
var marginLeft = parseInt($tip.css('margin-left'), 10)
// we must check for NaN for ie 8/9
if (isNaN(marginTop)) marginTop = 0
if (isNaN(marginLeft)) marginLeft = 0
offset.top += marginTop// 加上toop自己的margin 因为位置不包过外边框
offset.left += marginLeft
// $.fn.offset doesn't round pixel values
// so we use setOffset directly with our own function B-0 用jquery内部的方法来指定top和left，是对jquery有多熟啊， 这段还真是不好理解，回头看
$.offset.setOffset($tip[0], $.extend({
using: function (props) {
$tip.css({
top: Math.round(props.top),
left: Math.round(props.left)
})
}
}, offset), 0)
$tip.addClass('in')//目前就显示了
// check to see if placing tip in new offset caused the tip to resize itself
var actualWidth = $tip[0].offsetWidth
var actualHeight = $tip[0].offsetHeight
if (placement == 'top' && actualHeight != height) {
offset.top = offset.top + height - actualHeight
}
var delta = this.getViewportAdjustedDelta(placement, offset, actualWidth, actualHeight)//得到视口调整三角，什么意思
if (delta.left) offset.left += delta.left
else offset.top += delta.top
var isVertical = /top|bottom/.test(placement)
var arrowDelta = isVertical ? delta.left * 2 - width + actualWidth : delta.top * 2 - height + actualHeight
var arrowOffsetPosition = isVertical ? 'offsetWidth' : 'offsetHeight'
$tip.offset(offset)
this.replaceArrow(arrowDelta, $tip[0][arrowOffsetPosition], isVertical)
}
Tooltip.prototype.replaceArrow = function (delta, dimension, isVertical) {
this.arrow()
.css(isVertical ? 'left' : 'top', 50 * (1 - delta / dimension) + '%')
.css(isVertical ? 'top' : 'left', '')
}
Tooltip.prototype.setContent = function () {
var $tip = this.tip()//得到dom节点
var title = this.getTitle()//得到数据
$tip.find('.tooltip-inner')[this.options.html ? 'html' : 'text'](title)//这里是判断是用$().html(),形式还是$().text()方式填入title数据
$tip.removeClass('fade in top bottom left right')//移除这些可能有的class
}
Tooltip.prototype.hide = function (callback) {
var that = this
var $tip = $(this.$tip)
var e = $.Event('hide.bs.' + this.type)
function complete() {
if (that.hoverState != 'in') $tip.detach()
if (that.$element) { // TODO: Check whether guarding this code with this `if` is really necessary.
that.$element
.removeAttr('aria-describedby')
.trigger('hidden.bs.' + that.type)
}
callback && callback()
}
this.$element.trigger(e)
if (e.isDefaultPrevented()) return
$tip.removeClass('in')
$.support.transition && $tip.hasClass('fade') ?
$tip
.one('bsTransitionEnd', complete)
.emulateTransitionEnd(Tooltip.TRANSITION_DURATION) :
complete()
this.hoverState = null
return this
}
Tooltip.prototype.fixTitle = function () {
var $e = this.$element
if ($e.attr('title') || typeof $e.attr('data-original-title') != 'string') {
$e.attr('data-original-title', $e.attr('title') || '').attr('title', '')
}
}
Tooltip.prototype.hasContent = function () {
return this.getTitle()
}
Tooltip.prototype.getPosition = function ($element) {//得到任意元素的位置（默认为触发元素）
$element = $element || this.$element
var el = $element[0]
var isBody = el.tagName == 'BODY'
var elRect = el.getBoundingClientRect()// 这个方法返回一个矩形对象，包含四个属性：left、top、right和bottom。分别表示元素各边与页面上边和左边的距离。(包括宽高) 但是right，bottom和css中的理解有点不一样
if (elRect.width == null) {//兼容ie8，没有height和with的情况
// width and height are missing in IE8, so compute them manually; see https://github.com/twbs/bootstrap/issues/14093
elRect = $.extend({}, elRect, { width: elRect.right - elRect.left, height: elRect.bottom - elRect.top })
}
var isSvg = window.SVGElement && el instanceof window.SVGElement//是否为svg
// Avoid using $.offset() on SVGs since it gives incorrect results in jQuery 3.
// See https://github.com/twbs/bootstrap/issues/20280
var elOffset = isBody ? { top: 0, left: 0 } : (isSvg ? null : $element.offset())//获取匹配元素在当前视口的相对偏移。
var scroll = { scroll: isBody ? document.documentElement.scrollTop || document.body.scrollTop : $element.scrollTop() }//获取滚动条高度
var outerDims = isBody ? { width: $(window).width(), height: $(window).height() } : null//is body时要做怎么多处理
return $.extend({}, elRect, scroll, outerDims, elOffset)//都掺和一下，为了保险 主要还是 el.getBoundingClientRect() $element.offset()
}
Tooltip.prototype.getCalculatedOffset = function (placement, pos, actualWidth, actualHeight) {//获取计算后的样式，即：tooptip 应该在哪个位置显示 这是一套固定算法，算出如何在其中间位置显示
return placement == 'bottom' ? { top: pos.top + pos.height, left: pos.left + pos.width / 2 - actualWidth / 2 } :
placement == 'top' ? { top: pos.top - actualHeight, left: pos.left + pos.width / 2 - actualWidth / 2 } :
placement == 'left' ? { top: pos.top + pos.height / 2 - actualHeight / 2, left: pos.left - actualWidth } :
/* placement == 'right' */ { top: pos.top + pos.height / 2 - actualHeight / 2, left: pos.left + pos.width }
}
Tooltip.prototype.getViewportAdjustedDelta = function (placement, pos, actualWidth, actualHeight) {
var delta = { top: 0, left: 0 }
if (!this.$viewport) return delta// $viewport 为body的jquery对象
var viewportPadding = this.options.viewport && this.options.viewport.padding || 0
var viewportDimensions = this.getPosition(this.$viewport)//获取body的rect矩阵位置
if (/right|left/.test(placement)) {
var topEdgeOffset = pos.top - viewportPadding - viewportDimensions.scroll
var bottomEdgeOffset = pos.top + viewportPadding - viewportDimensions.scroll + actualHeight
if (topEdgeOffset < viewportDimensions.top) { // top overflow
delta.top = viewportDimensions.top - topEdgeOffset
} else if (bottomEdgeOffset > viewportDimensions.top + viewportDimensions.height) { // bottom overflow
delta.top = viewportDimensions.top + viewportDimensions.height - bottomEdgeOffset
}
} else {//top 或bootem时
var leftEdgeOffset = pos.left - viewportPadding
var rightEdgeOffset = pos.left + viewportPadding + actualWidth
if (leftEdgeOffset < viewportDimensions.left) { // left overflow
delta.left = viewportDimensions.left - leftEdgeOffset
} else if (rightEdgeOffset > viewportDimensions.right) { // right overflow
delta.left = viewportDimensions.left + viewportDimensions.width - rightEdgeOffset
}
}
return delta
}
Tooltip.prototype.getTitle = function () {
var title
var $e = this.$element
var o = this.options
title = $e.attr('data-original-title')//优先提取 html属性里面的title
|| (typeof o.title == 'function' ? o.title.call($e[0]) : o.title)//也可以在配置参数时指定title的回调函数
return title
}
Tooltip.prototype.getUID = function (prefix) {
do prefix += ~~(Math.random() * 1000000)//~~ 位操作符一直没研究透,汗颜。。
while (document.getElementById(prefix))//去重处理
return prefix
}
Tooltip.prototype.tip = function () {
if (!this.$tip) {
this.$tip = $(this.options.template)
if (this.$tip.length != 1) {
throw new Error(this.type + ' `template` option must consist of exactly 1 top-level element!')
}
}
return this.$tip
}
Tooltip.prototype.arrow = function () {
return (this.$arrow = this.$arrow || this.tip().find('.tooltip-arrow'))
}
Tooltip.prototype.enable = function () {
this.enabled = true
}
Tooltip.prototype.disable = function () {
this.enabled = false
}
Tooltip.prototype.toggleEnabled = function () {
this.enabled = !this.enabled
}
Tooltip.prototype.toggle = function (e) {
var self = this
if (e) {
self = $(e.currentTarget).data('bs.' + this.type)
if (!self) {
self = new this.constructor(e.currentTarget, this.getDelegateOptions())
$(e.currentTarget).data('bs.' + this.type, self)
}
}
if (e) {
self.inState.click = !self.inState.click
if (self.isInStateTrue()) self.enter(self)
else self.leave(self)
} else {
self.tip().hasClass('in') ? self.leave(self) : self.enter(self)
}
}
Tooltip.prototype.destroy = function () {
var that = this
clearTimeout(this.timeout)
this.hide(function () {
that.$element.off('.' + that.type).removeData('bs.' + that.type)
if (that.$tip) {
that.$tip.detach()
}
that.$tip = null
that.$arrow = null
that.$viewport = null
that.$element = null
})
}
// TOOLTIP PLUGIN DEFINITION
// =========================
function Plugin(option) {//jquery 插件的入口方法
return this.each(function () {//each 在这里就很有意义了，如果选择器选到n个元素，就可以挨个初始化了
var $this = $(this)
var data = $this.data('bs.tooltip')
var options = typeof option == 'object' && option //option 是object时才付给option否则为false
if (!data && /destroy|hide/.test(option)) return //有data时 return 或者有destroy或hide时返回
if (!data) $this.data('bs.tooltip', (data = new Tooltip(this, options)))//初始化data并数据缓存，下次直接使用 new Tooltip(this, options))这里已经执行了大部分功能，可以跟过去看看
if (typeof option == 'string') data[option]()
})
}
var old = $.fn.tooltip
$.fn.tooltip = Plugin
$.fn.tooltip.Constructor = Tooltip
// TOOLTIP NO CONFLICT
// ===================
$.fn.tooltip.noConflict = function () {
$.fn.tooltip = old
return this
}
}(jQuery);
//显示：校正状态为true self.inState，
