JavaScript 부동 위치 지정 프롬프트 효과 구현 code_javascript 기술

var css = this._cssTip; 
css.margin = 0; 
css.position = "absolute"; css.visibility = "hidden"; 
css.display = "block"; css.zIndex = 99; 
css.left = this._cssTip.top = "-9999px";

var iLeft = 0, iTop = 0, p = this.Tip; 
while (p.offsetParent) { 
p = p.offsetParent; iLeft += p.offsetLeft; iTop += p.offsetTop; 
}; 
this._offsetleft = iLeft; 
this._offsettop = iTop;

ShowType: "both",//显示方式 
HideType: "both",//隐藏方式 
ShowDelayType: "touch",//显示延迟方式 
HideDelayType: "touch",//隐藏延迟方式 
ShowDelay: 300,//显示延时时间 
HideDelay: 300,//隐藏延时时间 
Fixed: {},//定位对象 
onShow: function(){},//显示时执行 
onHide: function(){}//隐藏时执行

return !this._trigger || 
!( 
this.Tip === elem || this._trigger.Elem === elem || 
Contains(this.Tip, elem) || Contains(this._trigger.Elem, elem) 
);

addEvent(elem, "click", BindAsEventListener(this, function(e){ 
if ( this.IsClick(trigger.ShowType) ) { 
if ( this.CheckShow(trigger) ) { 
this.ReadyShow(this.IsClick(trigger.ShowDelayType)); 
} else { 
clearTimeout(this._timer); 
}; 
}; 
}));

if (trigger !== this._trigger) { 
this.Hide(); this._trigger = trigger; return true; 
} else { return false; };

this._fCH = BindAsEventListener(this, function(e) { 
if (this.Check(e.target) && this.CheckHide()) { 
this.ReadyHide(this.IsClick(this._trigger.HideDelayType)); 
}; 
});

if (this._cssTip.visibility === "hidden") { 
clearTimeout(this._timer); 
removeEvent(this._trigger.Elem, "mouseout", this._fTH); 
this._trigger = null; 
removeEvent(document, "click", this._fCH); 
return false; 
} else { return true; };

addEvent(elem, "mouseover", BindAsEventListener(this, function(e){ 
if ( this.IsTouch(trigger.ShowType) ) { 
if (this.CheckShow(trigger)) { 
this.ReadyShow(this.IsTouch(trigger.ShowDelayType)); 
} else if (this.Check(e.relatedTarget)) { 
clearTimeout(this._timer); 
}; 
}; 
}));

this._fTH = BindAsEventListener(this, function(e) { 
if (this.Check(e.relatedTarget) && this.CheckHide()) { 
this.ReadyHide(this.IsTouch(this._trigger.HideDelayType)); 
}; 
});

var iframe = document.createElement("<iframe style=&#39;position:absolute;filter:alpha(opacity=0);display:none;&#39;>"); 
document.body.insertBefore(iframe, document.body.childNodes[0]); 
this._cssiframe = iframe.style;

var css = this._cssiframe; css.width = this.Tip.offsetWidth + "px"; css.height = this.Tip.offsetHeight + "px"; css.left = iLeft + "px"; css.top = iTop + "px"; css.display = "";

var FixedTips = function(tip, options){ 
this.Tip = $$(tip);//提示框 
this._trigger = null;//触发对象 
this._timer = null;//定时器 
this._cssTip = this.Tip.style;//简化代码 
this._onshow = false;//记录当前显示状态 
this.SetOptions(options); 
//处理Tip对象 
var css = this._cssTip; 
css.margin = 0;//避免定位问题 
css.position = "absolute"; css.visibility = "hidden"; 
css.display = "block"; css.zIndex = 99; 
css.left = this._cssTip.top = "-9999px";//避免占位出现滚动条 
//offset修正参数 
var iLeft = 0, iTop = 0, p = this.Tip; 
while (p.offsetParent) { 
p = p.offsetParent; iLeft += p.offsetLeft; iTop += p.offsetTop; 
}; 
this._offsetleft = iLeft; 
this._offsettop = iTop; 
//移入Tip对象时保持显示状态 
addEvent(this.Tip, "mouseover", BindAsEventListener(this, function(e){ 
//如果是外部元素进入，说明当前是隐藏延时阶段，那么清除定时器取消隐藏 
this.Check(e.relatedTarget) && clearTimeout(this._timer); 
})); 
//ie6处理select 
if (isIE6) { 
var iframe = document.createElement("<iframe style=&#39;position:absolute;filter:alpha(opacity=0);display:none;&#39;>"); 
document.body.insertBefore(iframe, document.body.childNodes[0]); 
this._cssiframe = iframe.style; 
}; 
//用于点击方式隐藏 
this._fCH = BindAsEventListener(this, function(e) { 
if (this.Check(e.target) && this.CheckHide()) { 
this.ReadyHide(this.IsClick(this._trigger.HideDelayType)); 
}; 
}); 
//用于触发方式隐藏 
this._fTH = BindAsEventListener(this, function(e) { 
if (this.Check(e.relatedTarget) && this.CheckHide()) { 
this.ReadyHide(this.IsTouch(this._trigger.HideDelayType)); 
}; 
}); 
}; 
FixedTips.prototype = { 
//设置默认属性 
SetOptions: function(options) { 
this.options = {//默认值 
ShowType: "both",//显示方式 
HideType: "both",//隐藏方式 
ShowDelayType: "touch",//显示延迟方式 
HideDelayType: "touch",//隐藏延迟方式 
//"click":只用点击方式,"touch":只用触发方式,"both":两个都使用,"none":都不使用 
ShowDelay: 300,//显示延时时间 
HideDelay: 300,//隐藏延时时间 
Fixed: {},//定位对象 
onShow: function(){},//显示时执行 
onHide: function(){}//隐藏时执行 
}; 
Extend(this.options, options || {}); 
}, 
//检查触发元素 
Check: function(elem) { 
//返回是否外部元素（即触发元素和Tip对象本身及其内部元素以外的元素对象） 
return !this._trigger || 
!( 
this.Tip === elem || this._trigger.Elem === elem || 
Contains(this.Tip, elem) || Contains(this._trigger.Elem, elem) 
); 
}, 
//准备显示 
ReadyShow: function(delay) { 
clearTimeout(this._timer); 
var trigger = this._trigger; 
//触发方式隐藏 
this.IsTouch(trigger.HideType) && addEvent(this._trigger.Elem, "mouseout", this._fTH); 
//点击方式隐藏 
this.IsClick(trigger.HideType) && addEvent(document, "click", this._fCH); 
//显示 
if (delay) { 
this._timer = setTimeout(Bind(this, this.Show), trigger.ShowDelay); 
} else { this.Show(); }; 
}, 
//显示 
Show: function() { 
clearTimeout(this._timer); 
this._trigger.onShow();//放在前面方便修改属性 
//根据预设定位和自定义定位计算left和top 
var trigger = this._trigger, 
pos = GetRelative(trigger.Elem, this.Tip, trigger.Fixed), 
iLeft = pos.Left, iTop = pos.Top; 
//设置位置并显示 
this._cssTip.left = iLeft - this._offsetleft + "px"; 
this._cssTip.top = iTop - this._offsettop + "px"; 
this._cssTip.visibility = "visible"; 
//ie6处理select 
if (isIE6) { 
var css = this._cssiframe; 
css.width = this.Tip.offsetWidth + "px"; 
css.height = this.Tip.offsetHeight + "px"; 
css.left = iLeft + "px"; css.top = iTop + "px"; css.display = ""; 
}; 
//触发方式隐藏 
this.IsTouch(trigger.HideType) && addEvent(this.Tip, "mouseout", this._fTH); 
}, 
//准备隐藏 
ReadyHide: function(delay) { 
clearTimeout(this._timer); 
if (delay) { 
this._timer = setTimeout(Bind(this, this.Hide), this._trigger.HideDelay); 
} else { this.Hide(); }; 
}, 
//隐藏 
Hide: function() { 
clearTimeout(this._timer); 
//设置隐藏 
this._cssTip.visibility = "hidden"; 
this._cssTip.left = this._cssTip.top = "-9999px"; 
//ie6处理select 
if (isIE6) { this._cssiframe.display = "none"; }; 
//处理触发对象 
if (!!this._trigger) { 
this._trigger.onHide(); 
removeEvent(this._trigger.Elem, "mouseout", this._fTH); 
} 
this._trigger = null; 
//移除事件 
removeEvent(this.Tip, "mouseout", this._fTH); 
removeEvent(document, "click", this._fCH); 
}, 
//添加触发对象 
Add: function(elem, options) { 
//创建一个触发对象 
var elem = $$(elem), trigger = Extend( Extend( { Elem: elem }, this.options ), options || {} ); 
//点击方式显示 
addEvent(elem, "click", BindAsEventListener(this, function(e){ 
if ( this.IsClick(trigger.ShowType) ) { 
if ( this.CheckShow(trigger) ) { 
this.ReadyShow(this.IsClick(trigger.ShowDelayType)); 
} else { 
clearTimeout(this._timer); 
}; 
}; 
})); 
//触发方式显示 
addEvent(elem, "mouseover", BindAsEventListener(this, function(e){ 
if ( this.IsTouch(trigger.ShowType) ) { 
if (this.CheckShow(trigger)) { 
this.ReadyShow(this.IsTouch(trigger.ShowDelayType)); 
} else if (this.Check(e.relatedTarget)) { 
clearTimeout(this._timer); 
}; 
}; 
})); 
//返回触发对象 
return trigger; 
}, 
//显示检查 
CheckShow: function(trigger) { 
if ( trigger !== this._trigger ) { 
//不是同一个触发对象就先执行Hide防止冲突 
this.Hide(); this._trigger = trigger; return true; 
} else { return false; }; 
}, 
//隐藏检查 
CheckHide: function() { 
if ( this._cssTip.visibility === "hidden" ) { 
//本来就是隐藏状态，不需要再执行Hide 
clearTimeout(this._timer); 
removeEvent(this._trigger.Elem, "mouseout", this._fTH); 
this._trigger = null; 
removeEvent(document, "click", this._fCH); 
return false; 
} else { return true; }; 
}, 
//是否点击方式 
IsClick: function(type) { 
type = type.toLowerCase(); 
return type === "both" || type === "click"; 
}, 
//是否触发方式 
IsTouch: function(type) { 
type = type.toLowerCase(); 
return type === "both" || type === "touch"; 
} 
};