首先我没有使用前人的导出rss的方法(方法参见
也来为自己的博客加个花,兼AJAX跨域的一点疑问),因为我的随笔也不是篇篇都是精华,嘿嘿。所以我就手写了个table代码如下
<!-- TitleMenu Begin -->
<div style="height: 16px; border: 0px; position: absolute; top: 40px; left: 530px; width:500px;"
id="Tree_ShowTitleImg">
<table border="0" cellpadding="0" cellspacing="0" style="float: left;">
<tr>
<td style="height: 16px; line-height: 16px; width:20px;">
<img src="/images/cnblogs_com/treeyh/broadcast.gif" alt="图片" title="图片" /></td>
<td style="height: 17px; line-height: 16px; color:Red; width:50px;" valign="bottom">
推荐阅读</td>
</tr>
</table>
<div style="height: 16px; overflow: hidden; border: 0px; margin-left: 5px;" id="Tree_ShowTitle">
<div style="border: 0px; font-size: 12px; height: 100%;" id="Tree_ShowTitle1">
<table border="0" cellpadding="0" cellspacing="0">
<tr>
<td style="height: 16px; line-height: 16px;">
<a href="http://www.cnblogs.com/treeyh/archive/2008/01/10/1034080.html" target="_blank">使用Repeater实现类似GridView编辑功能</a></td>
</tr>
<tr>
<td style="height: 16px; line-height: 16px;">
<a href="http://www.cnblogs.com/treeyh/archive/2007/12/28/1018409.html" target="_blank">关于ActiveX插件小项目总结</a></td>
</tr>
<tr>
<td style="height: 16px; line-height: 16px;">
<a href="http://www.cnblogs.com/treeyh/archive/2008/01/04/1026048.html" target="_blank">调用windows注册表获得参数</a></td>
</tr>
<tr>
<td style="height: 16px; line-height: 16px;">
<a href="http://www.cnblogs.com/treeyh/archive/2008/01/04/1026048.html" target="_blank">原来SQL也有try-catch</a></td>
</tr>
</table>
</div>
<div style="border: 0px;" id="Tree_ShowTitle2">
</div>
</div>
</div>
<!-- TitleMenu End -->
对于排版,我采用绝对坐标的方式,图片拷贝了杨正祎博客中的图标,见谅见谅啊,嘿嘿。总体结构是一个大的div包含两个内部的div,第一个div中装载我所显示的table,第二个会用js的innerHTML方法加载与第一个div相同的内容,然后循环显示内部的两个div。
下面先介绍我所用到的几个函数
//获得实例
function $(objectId)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
{
return document.getElementById(objectId);
}
//添加事件
function addEvent(oTarget,eventType,fnEvent)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
{
if(oTarget.addEventListener)
oTarget.addEventListener(eventType,fnEvent,false);
else if (oTarget.attachEvent)
oTarget.attachEvent('on' + eventType,fnEvent);
else
oTarget['on' + eventType] = fnEvent;
}
//移除事件
function removeEvent(oTarget,eventType,fnEvent)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
{
if(oTarget.removeEventListener)
oTarget.removeEventListener(eventType,fnEvent,false);
else if (oTarget.detachEvent)
oTarget.detachEvent('on' + eventType,fnEvent);
else
oTarget['on' + eventType] = null;
}
第一个函数应该不用解释了,后面两个是添加和删除事件用的,主要用于鼠标移动上去使滚动暂时的效果,写法是我参照《javascript高级程序设计》p252-253页的实例,addEventListener和removeEventListener方法是firefox中使用,IE是后面两个。
现在开始讲实现函数了,按照OO的原则,我希望能用一个函数就能实现这样的功能,这个函数要传入这样几个参数,第一个为主容器ID,第二、三个为两个子容器ID,第四个参数为间隔的时间(单位是毫秒),然后调用相关的方法就OK了,下面是函数体。
var _treeMenu;
//跳转函数,1、主容器,2、子容器1,3、子容器2,4、运行间隔(毫秒)
function TreeMenu(titleMainCase , titleCase1 , titleCase2 , spaceTime)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ContractedBlock.gif)
{
this._otitle = $(titleMainCase);
this._otitle1 = $(titleCase1);
this._otitle2 = $(titleCase2);
this._spaceTime = spaceTime;
this._runTitle = null;
this._startTitle = null;
this._stopTitle = null;
}
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
TreeMenu.prototype =
{
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
Init : function()
{
_treeMenu = this;
_treeMenu._otitle2.innerHTML = _treeMenu._otitle1.innerHTML;
},
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
Start : function()
{ //定制_treeMenu._spaceTime毫秒启动_Run方法
addEvent(_treeMenu._otitle,'mouseover',_treeMenu._Release);
addEvent(_treeMenu._otitle,'mouseout',_treeMenu.Start);
_treeMenu._startTitle = setTimeout(_treeMenu._Run , _treeMenu._spaceTime);
},
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
_Run : function()
{ //运行标题跳转,运行间隔100毫秒,取消_treeMenu._otitle事件,900毫秒后执行_Stop方法
removeEvent(_treeMenu._otitle,'mouseover',_treeMenu._Release);
removeEvent(_treeMenu._otitle,'mouseout',_treeMenu.Start);
_treeMenu._runTitle = setInterval(_treeMenu._TitleTurn , 100);
_treeMenu._stopTitle = setTimeout(_treeMenu._Stop , 900);
},
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
_Stop : function()
{ //停止标题跳转,加载_treeMenu._otitle事件,并执行Start方法
clearInterval(_treeMenu._runTitle);
_treeMenu.Start();
},
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
_Release : function()
{ //清除_treeMenu._startTitle中方法
clearTimeout(_treeMenu._startTitle);
},
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedSubBlockStart.gif)
_TitleTurn : function()
{ //标题跳转
if(_treeMenu._otitle2.offsetTop - _treeMenu._otitle.scrollTop<=0)
_treeMenu._otitle.scrollTop -= (_treeMenu._otitle1.offsetHeight-2);
else
_treeMenu._otitle.scrollTop = _treeMenu._otitle.scrollTop+2;
}
}
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
注意_treeMenu这个全局变量,这是在调用Init方法初始化的时候把函数体赋过去,之后用它来进行调用,而不能用this,这时候的this是window具体是为什么,我还没深入研究,在这个问题上卡了很长时间,差点就放弃了,后来无意间看到一片文章,嘿嘿。
下面介绍下几个方法吧,虽然注释都写在上面了:
1、Init方法是初始化_treeMenu变量,然后innerHTML入div2;
2、Start方法是整个函数体的启动方法,在运行间隔后执行_Run方法,并加载鼠标事件;
3、_Run方法,它首先取消鼠标事件,然后执行标题跳转,并且900毫秒后执行_Stop方法;
4、_Stop方法是一个衔接的过程,承上启下;
5、最后_TitleTurn方法就是具体的标题翻转的方法了。
最后调用只要三行代码就够了:
var ofunction = new TreeMenu('Tree_ShowTitle' , 'Tree_ShowTitle1' , 'Tree_ShowTitle2' , 3000);
ofunction.Init();
ofunction.Start();
因为要看效果,我设的是3秒跳转一次简单明了,不过推荐5秒,不要人家刚想把鼠标点上去就移走了,嘿嘿。
不过如果在FireFox下显示会有叠影问题,估计是CSS没调好,而且Top高度也与IE不同,不知何故,唉
附代码下载:TreeMenu.js
本文来自:http://www.cnblogs.com/treeyh/archive/2008/02/01/1061462.htmlhttp://www.cnblogs.com/treeyh/archive/2008/02/01/1061462.html