BootStrap Tooltip插件源码解析

+function ($) {
 'use strict';

 // TOOLTIP PUBLIC CLASS DEFINITION
 // ===============================


 var Tooltip = function (element, options) {
  this.type    =
  this.options  =
  this.enabled  =
  this.timeout  =
  this.hoverState =
  this.$element  = null

  this.init('tooltip', element, options)
 }

 Tooltip.VERSION = '3.3.0'

 Tooltip.TRANSITION_DURATION = 150

 //默认参数
 Tooltip.DEFAULTS = {
  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
  }
 }

 //初始化
 Tooltip.prototype.init = function (type, element, options) {
  this.enabled  = true
  this.type   = type
  this.$element = $(element)
  //初始化参数
  this.options  = this.getOptions(options)

  this.$viewport = this.options.viewport && $(this.options.viewport.selector || this.options.viewport)

  //多个触发器 即触发函数
  var triggers = this.options.trigger.split(' ')


  for (var i = triggers.length; i--;) {
   var trigger = triggers[i]

   if (trigger == 'click') {
    //绑定事件处理程序
    //事件命名空间 'click.tooltip'
    //触发时执行$.proxy(this.toggle, this)返回的函数
    this.$element.on('click.' + this.type, this.options.selector, $.proxy(this.toggle, this))
   } else if (trigger != 'manual') {
    var eventIn = trigger == 'hover' "auto"
   var autoToken = /\s"auto"时
   if (autoPlace) placement = placement.replace(autoToken, '') || 'top'

   $tip
    //detach() 删除匹配的对象 与remove()不同的是，所有绑定的事件、附加的数据等都会保留下来
    .detach()
    .css({ top: 0, left: 0, display: 'block' })
    .addClass(placement)
    .data('bs.' + this.type, this)
   //参数 container 向指定元素添加该提示框
   //没有 添加到当前元素后面
   this.options.container "tooltip" role="tooltip"><div class="tooltip-arrow"></div><div class="tooltip-inner"></div></div>
 Tooltip.prototype.tip = function () {
  return (this.$tip = this.$tip || $(this.options.template))
 }

 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
 }

 //click 事件触发时执行的函数
 Tooltip.prototype.toggle = function (e) {
  //this tooltip实例对象
  var self = this
  if (e) {
   //e.currentTarget 返回注册该事件处理程序的元素
   self = $(e.currentTarget).data('bs.' + this.type)
   if (!self) {
    self = new this.constructor(e.currentTarget, this.getDelegateOptions())
    $(e.currentTarget).data('bs.' + this.type, self)
   }
  }
  //判断提示框当前的状态
  //true 当前显示 需要隐藏
  //false 相反
  self.tip().hasClass('in') "#aa").tooltip().noConflict();
 $.fn.tooltip.noConflict = function () {
  $.fn.tooltip = old
  return this
 }

}(jQuery);