BootStrap的Tooltip插件源码解析

来源:互联网 发布:正品篮球鞋淘宝店铺 编辑:程序博客网 时间:2024/06/05 20:22

Tooltip插件可以让你把要显示的内容以弹出框的形式来展示,如:

这里写图片描述

因为自己在工作的过程中,用到了Tooltip这个插件,并且当时正想学习一下元素定位的问题,如:提示框显示的位置就是触发提示框元素的位置,可以配置在上、下、左、右等位置,所以就去看了源码。对于整个插件源码没有看全,但也学到了许多的知识点。能力有限,可能其中有认识错误的地方,以后再补充吧

1 使用方法不介绍 ,可以参照

Bootstrap 提示工具(Tooltip)插件

2 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, $.proxy(this.toggle, this))      } else if (trigger != 'manual') {        var eventIn  = trigger == 'hover' ? 'mouseenter' : 'focusin'        var eventOut = trigger == 'hover' ? 'mouseleave' : 'focusout'        this.$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 = $.extend({}, this.options, { trigger: 'manual', selector: '' })) :      this.fixTitle()  }  Tooltip.prototype.getDefaults = function () {    return Tooltip.DEFAULTS  }  //获得初始化参数  Tooltip.prototype.getOptions = function (options) {    // this.$element.data() data-key = value 形式的属性获取     // 返回一个对象{key:value}    // options > 元素属性  > 默认      options = $.extend({}, this.getDefaults(), this.$element.data(), options)    //delay 为数字 特殊处理    //delay 为对象  delay:{ show: 500, hide: 100 }    if (options.delay && typeof options.delay == 'number') {      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  }  //提示框显示  Tooltip.prototype.enter = function (obj) {    //obj是否是tooltip的实例    var self = obj instanceof this.constructor ?      obj : $(obj.currentTarget).data('bs.' + this.type)    //$tip.is(':visible') 该div是否可见    //可见时 只更新状态  然后直接返回    if (self && self.$tip && self.$tip.is(':visible')) {      self.hoverState = 'in'      return    }    //self 不存在    if (!self) {      self = new this.constructor(obj.currentTarget, this.getDelegateOptions())      $(obj.currentTarget).data('bs.' + this.type, self)    }    //上次点击延时未显示 则取消显示    clearTimeout(self.timeout)    //设置状态    self.hoverState = 'in'    //delay: 数字 (默认 0) 或   对象  { show: 500, hide: 100 }    //没有delay delay.show 时  直接显示     if (!self.options.delay || !self.options.delay.show) return self.show()    //延时显示  self.options.delay.show:延时时间    self.timeout = setTimeout(function () {      if (self.hoverState == 'in') self.show()    }, self.options.delay.show)  }  //提示框隐藏  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)    }    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)  }  //提示框显示核心方法  Tooltip.prototype.show = function () {    console.info(this)      var e = $.Event('show.bs.' + this.type)    if (this.hasContent() && this.enabled) {      this.$element.trigger(e)      //判断是否在根节点中      //this.$element[0] 转换为DOM对象      //.ownerDocument Document文档对象      //.documentElement 根节点 HTML标签      //$.contains 一个DOM节点是否包含另一个DOM节点。      var inDom = $.contains(this.$element[0].ownerDocument.documentElement, this.$element[0])      //调用preventDefault 或 不在根节点  return      //事件对象中是否调用过 event.preventDefault()      //event.preventDefault():阻止元素发生默认的行为      //如  当点击提交按钮时阻止对表单的提交 、 阻止以下 URL 的链接      if (e.isDefaultPrevented() || !inDom) return      var that = this      var $tip = this.tip()      var tipId = this.getUID(this.type)      //设置提示框的title      this.setContent()      $tip.attr('id', tipId)      this.$element.attr('aria-describedby', tipId)      //参数animation      if (this.options.animation) $tip.addClass('fade')      //参数placement 提示框的位置 top bottom left right      var placement = typeof this.options.placement == 'function' ?        this.options.placement.call(this, $tip[0], this.$element[0]) :        this.options.placement      // 判断placement是否包含"auto"      var autoToken = /\s?auto?\s?/i      var autoPlace = autoToken.test(placement)      //包含 "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 ? $tip.appendTo(this.options.container) : $tip.insertAfter(this.$element)      //位置对象pos pos =  {top: , right: , bottom: , left: , width: ,scroll:}      var pos          = this.getPosition()      //提示框自身实际的 width height      var actualWidth  = $tip[0].offsetWidth      var actualHeight = $tip[0].offsetHeight      if (autoPlace) {        var orgPlacement = placement        var $container   = this.options.container ? $(this.options.container) : this.$element.parent()        var containerDim = this.getPosition($container)        placement = placement == 'bottom' && pos.bottom + actualHeight > containerDim.bottom ? 'top'    :                    placement == 'top'    && pos.top    - actualHeight < containerDim.top    ? 'bottom' :                    placement == 'right'  && pos.right  + actualWidth  > containerDim.width  ? 'left'   :                    placement == 'left'   && pos.left   - actualWidth  < containerDim.left   ? 'right'  :                    placement        $tip          .removeClass(orgPlacement)          .addClass(placement)      }      //计算提示框的偏移量 {top: , left: }      var calculatedOffset = this.getCalculatedOffset(placement, pos, actualWidth, actualHeight)      //应用并设置偏移量      this.applyPlacement(calculatedOffset, placement)      var complete = function () {        var prevHoverState = that.hoverState        that.$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 = $tip[0].offsetHeight    // manually read margins because getBoundingClientRect includes difference    //获得提示框自身的外边距的值    var marginTop = parseInt($tip.css('margin-top'), 10)    var marginLeft = parseInt($tip.css('margin-left'), 10)    // we must check for NaN for ie 8/9    //是否是非数字    if (isNaN(marginTop))  marginTop  = 0    if (isNaN(marginLeft)) marginLeft = 0    //计算的偏移量 + 自身的外边距    offset.top  = offset.top  + marginTop    offset.left = offset.left + marginLeft    // $.fn.offset doesn't round pixel values    // so we use setOffset directly with our own function B-0    // 应用了offset.setOffset方法,传入了using参数,因为offset设置值的时候,不能四舍五入    $.offset.setOffset($tip[0], $.extend({      using: function (props) {        $tip.css({          top: Math.round(props.top),          left: Math.round(props.left)        })      }    }, offset), 0)    //添加 in class 让提示框显示    $tip.addClass('in')    // check to see if placing tip in new offset caused the tip to resize itself    //获取显示后的提示框的宽和高  检查是否调整了自身的大小    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)    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, isHorizontal) {    this.arrow()      .css(isHorizontal ? 'left' : 'top', 50 * (1 - delta / dimension) + '%')      .css(isHorizontal ? 'top' : 'left', '')  }  //设置提示框的title  Tooltip.prototype.setContent = function () {    //div    var $tip  = this.tip()    var title = this.getTitle()    $tip.find('.tooltip-inner')[this.options.html ? 'html' : 'text'](title)    $tip.removeClass('fade in top bottom left right')  }  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') $tip.detach()      that.$element        .removeAttr('aria-describedby')        .trigger('hidden.bs.' + that.type)      callback && callback()    }    this.$element.trigger(e)    if (e.isDefaultPrevented()) return    $tip.removeClass('in')    $.support.transition && this.$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', $e.attr('title') || '').attr('title', '')    }  }  Tooltip.prototype.hasContent = function () {    return this.getTitle()  }  //获取位置  Tooltip.prototype.getPosition = function ($element) {    //不传入 则为当前点击元素    $element   = $element || this.$element    //转换为DOM对象    var el     = $element[0]    //是否是body元素    var isBody = el.tagName == 'BODY'    //获取元素各边与页面上边和左边的距离 left right top bottom height width    var elRect    = el.getBoundingClientRect()    //兼容IE8 没有 width height 则计算    if (elRect.width == null) {      // 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 })    }    //当前元素相对于文档的偏移量    var elOffset  = isBody ? { top: 0, left: 0 } : $element.offset()    //垂直滚动条的距离    //document.documentElement.scrollTop 和 document.body.scrollTop 浏览器兼容     var scroll    = { scroll: isBody ? document.documentElement.scrollTop || document.body.scrollTop : $element.scrollTop() }    var outerDims = isBody ? { width: $(window).width(), height: $(window).height() } : null    //合并     return $.extend({}, elRect, scroll, outerDims, elOffset)  }  //计算偏移量  Tooltip.prototype.getCalculatedOffset = function (placement, pos, actualWidth, actualHeight) {    return placement == 'bottom' ? { top: pos.top + pos.height,   left: pos.left + pos.width / 2 - actualWidth / 2  } :           placement == 'top'    ? { top: pos.top - actualHeight, left: pos.left + pos.width / 2 - actualWidth / 2  } :           placement == 'left'   ? { top: pos.top + pos.height / 2 - actualHeight / 2, left: pos.left - actualWidth } :        /* placement == 'right' */ { top: pos.top + pos.height / 2 - actualHeight / 2, left: pos.left + pos.width   }  }  Tooltip.prototype.getViewportAdjustedDelta = function (placement, pos, actualWidth, actualHeight) {    var delta = { top: 0, left: 0 }    //默认参数    //viewport: {    //  selector: 'body',    //  padding: 0    //}    //默认的话  this.$viewport = 'body'    if (!this.$viewport) return delta    var viewportPadding = this.options.viewport && this.options.viewport.padding || 0    //this.$viewport = 'body' width height为 window的    var viewportDimensions = this.getPosition(this.$viewport)    console.info(viewportDimensions)    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 {      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.width) { // right overflow        delta.left = viewportDimensions.left + viewportDimensions.width - rightEdgeOffset      }    }    return delta  }  //提示框的title  Tooltip.prototype.getTitle = function () {    var title    var $e = this.$element    var o  = this.options    //先获取当前元素的data-original-title属性    //否则获取参数title    title = $e.attr('data-original-title')      || (typeof o.title == 'function' ? o.title.call($e[0]) :  o.title)    return title  }  //随机生成唯一id  0 -- 100000 id值     Tooltip.prototype.getUID = function (prefix) {    //~~ 去掉小数部分    do prefix += ~~(Math.random() * 1000000)    while (document.getElementById(prefix))    return prefix  }  //生成提示框的div  //不存在 则用模板  //<div class="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())        $(e.currentTarget).data('bs.' + this.type, self)      }    }    //判断提示框当前的状态    //true 当前显示 需要隐藏    //false 相反    self.tip().hasClass('in') ? self.leave(self) : self.enter(self)  }  Tooltip.prototype.destroy = function () {    var that = this    clearTimeout(this.timeout)    this.hide(function () {      that.$element.off('.' + that.type).removeData('bs.' + that.type)    })  }  // TOOLTIP PLUGIN DEFINITION  // =========================  function Plugin(option) {    return this.each(function () {      var $this    = $(this)      //所选元素是否有  key为:bs.tooltip 对应的value值      var data     = $this.data('bs.tooltip')      //option为对象 options:option      //option为字符串 则是方法 options:false       var options  = typeof option == 'object' && option      //option是对象 执行初始化 ,并提供了选择器      var selector = options && options.selector      //是destroy 方法 不执行      if (!data && option == 'destroy') return      //tooltip初始化      if (selector) {        //存在选择器,则将当前点击元素 bs.tooltip = {} 即去掉Tooltip实例        if (!data) $this.data('bs.tooltip', (data = {}))        //给选择器加上Tooltip实例        if (!data[selector]) data[selector] = new Tooltip(this, options)      } else {        //没有value值时,则加上 bs.tooltip = data(new Tooltip(this, options))          if (!data) $this.data('bs.tooltip', (data = new Tooltip(this, options)))      }      //执行方法      if (typeof option == 'string') data[option]()    })  }  //缓存以前$.fn上的tooltip  var old = $.fn.tooltip  //添加到jQuery对象上  $.fn.tooltip             = Plugin  $.fn.tooltip.Constructor = Tooltip  // TOOLTIP NO CONFLICT  // ===================  //tooltip冲突时 调用该方法  //var other = $("#aa").tooltip().noConflict();  $.fn.tooltip.noConflict = function () {    $.fn.tooltip = old    return this  }}(jQuery);
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