HTML+CSS+JS实现TABLE固定列(常见浏览器兼容)的最佳实践_html/css_WEB-ITnose

WBOY
Release: 2016-06-21 09:14:13
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        BS架构的企业级应用中,当一个表格列数较多时,用户一个常见的需求就是把前面几个重要的列固定住,这样拖动滚动条时固定的列会方便用户查看数据,用户体验很好。一些重量级的JS组件库也都有这个功能,那么有没有更简单的方法实现这个功能呢?

        这个需求常见的解决方案是使用表格拼接的方法,这个方案如果要制作静态的网页,或者功能简单的动态页面,逻辑比较简单,技术上也不复杂,很容易实现,但是如果要做成组件,动态功能较多的话,就需要写大量的冗余代码,难以维护,甚至于一个简单的功能,都需要些很多的代码,比如事件处理等,这个方法就显得比较笨拙,灵活性很差,不是一个好的方案。

        经过长时间的分析研究,各种场景的试验,我们找到了一个兼容性非常好的解决方案,总体上来讲采用的是定位计算的方法,下面贴出代码,然后做个解读。

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>无标题文档</title><script type="text/javascript">function divScroll(scrollDiv){    var scrollLeft = scrollDiv.scrollLeft;    document.getElementById("tableDiv_title").scrollLeft = scrollLeft;    document.getElementById("tableDiv_body").scrollLeft = scrollLeft;        }function divYScroll(scrollYDiv){    var scrollTop = scrollYDiv.scrollTop;    document.getElementById("tableDiv_y").scrollTop = scrollTop;    }function onwheel(event){    var evt = event||window.event;    var bodyDivY = document.getElementById("tableDiv_y");    var scrollDivY = document.getElementById("scrollDiv_y");    if (bodyDivY.scrollHeight>bodyDivY.offsetHeight){        if (evt.deltaY){            bodyDivY.scrollTop = bodyDivY.scrollTop + evt.deltaY*7;            scrollDivY.scrollTop = scrollDivY.scrollTop + evt.deltaY*7;        }else{            bodyDivY.scrollTop = bodyDivY.scrollTop - evt.wheelDelta/5;            scrollDivY.scrollTop = scrollDivY.scrollTop - evt.wheelDelta/5;        }    }}</script><style type="text/css">body {margin:0;padding:0;}table {border-collapse:collapse;border:0;border:none;}table td  {border:1px solid #000;overflow:hidden;padding:0 2px;}</style></head><body><div style="width:500px; position:relative; padding-right:18px;">   <div style="position:relative;height:368px;overflow:hidden;width:100%">    <div style="padding-left:108px; width:auto;  overflow:hidden; background:#f00;" id="tableDiv_title" >    <table border="0" cellspacing="0" cellpadding="0"  >      <tr>        <td  style="min-width:30px; max-width:30px; left:0; top:0; width:30px;  overflow:hidden; background-color:#f00;position:absolute;z-index:1;">000</td>        <td  style="min-width:74px; max-width:74px; left:30px; top:0; width:74px;  overflow:hidden; background-color:#f00;position:absolute;z-index:1;">自动表格</td>        <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>        <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>        <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>        <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>        <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>        <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >最后一列</td>      </tr>      </table>      </div>      <div style="overflow:hidden; position:absolute;height:128px; width:100%;" id="tableDiv_y" onmousewheel="onwheel(event);" onwheel="onwheel(event);">       <div style="padding-left:108px; width:auto;overflow:hidden;" id="tableDiv_body">        <table border="0" cellspacing="0" cellpadding="0" >          <tr>            <td  style="min-width:30px; max-width:30px; left:0; width:30px; overflow:hidden; background-color:#fff;position:absolute;z-index:1;">001</td>            <td  style="min-width:74px; max-width:74px;  left: 30px; width: 74px; overflow:hidden; background-color:#fff;position:absolute;z-index:1;">自动表格</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >最后一列</td>          </tr>           <tr>           <td  style="min-width:30px; max-width:30px; left:0; width:30px; overflow:hidden; background-color:#fff; position:absolute; z-index:1;">002</td>            <td  style="min-width:74px; max-width:74px; left:30px; width:74px; overflow:hidden;background-color:#fff; position:absolute; z-index:1;">自动表格</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >最后一列</td>          </tr>          <tr>            <td  style="min-width:30px; max-width:30px; left:0; width:30px; overflow:hidden; background-color:#fff;position:absolute;z-index:1;">003</td>            <td  style="min-width:74px; max-width:74px;left: 30px; width: 74px; overflow:hidden;background-color:#fff;position:absolute;z-index:1;">自动表格</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >最后一列</td>          </tr>          <tr>            <td  style="min-width:30px; max-width:30px; left:0; width:30px; overflow:hidden; background-color:#fff;position:absolute;z-index:1;">004</td>            <td  style="min-width:74px; max-width:74px;  left: 30px; width: 74px; overflow:hidden;background-color:#fff;position:absolute;z-index:1;">自动表格</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >最后一列</td>          </tr>           <tr>            <td  style="min-width:30px; max-width:30px; left:0; width:30px; overflow:hidden; background-color:#fff;position:absolute;z-index:1;">005</td>            <td  style="min-width:74px; max-width:74px;  left: 30px; width: 74px; overflow:hidden;background-color:#fff;position:absolute;z-index:1;">自动表格</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >最后一列</td>          </tr>           <tr>            <td  style="min-width:30px; max-width:30px; left:0; width:30px; overflow:hidden; background-color:#fff;position:absolute;z-index:1;">006</td>            <td  style="min-width:74px; max-width:74px;  left: 30px; width: 74px; overflow:hidden;background-color:#fff;position:absolute;z-index:1;">自动表格</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >最后一列</td>          </tr>               <tr>            <td  style="min-width:30px; max-width:30px; left:0; width:30px; overflow:hidden; background-color:#fff;position:absolute;z-index:1;">007</td>            <td  style="min-width:74px; max-width:74px;  left: 30px; width: 74px; overflow:hidden;background-color:#fff;position:absolute;z-index:1;">自动表格</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >最后一列</td>          </tr>           <tr>            <td  style="min-width:30px; max-width:30px; left:0; width:30px; overflow:hidden; background-color:#fff;position:absolute;z-index:1;">008</td>            <td  style="min-width:74px; max-width:74px;  left: 30px; width: 74px; overflow:hidden;background-color:#fff;position:absolute;z-index:1;">自动表格</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >最后一列</td>          </tr>           <tr>            <td  style="min-width:30px; max-width:30px; left:0; width:30px; overflow:hidden; background-color:#fff;position:absolute;z-index:1;">009</td>            <td  style="min-width:74px; max-width:74px;  left: 30px; width: 74px; overflow:hidden;background-color:#fff;position:absolute;z-index:1;">自动表格</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >最后一列</td>          </tr>            <tr>            <td  style="min-width:30px; max-width:30px; left:0; width:30px; overflow:hidden; background-color:#fff;position:absolute;z-index:1;">010</td>            <td  style="min-width:74px; max-width:74px;  left: 30px; width: 74px; overflow:hidden;background-color:#fff;position:absolute;z-index:1;">自动表格</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >56454自动</td>            <td  style="min-width: 100px; max-width: 100px;  width: 100px;" >最后一列</td>          </tr>                   </table>    </div>              </div>      <div style="background-color:#eee;overflow:hidden;top:150px; width:100%; z-index:2;position:absolute;">        <div style="margin-left:108px; width:auto;overflow-x:scroll;overflow-y:hidden;" onscroll='divScroll(this);'>            <div style="width:630px; height:1px;"></div>        </div>    </div>    </div>        <div id="scrollDiv_y" style="display:block; overflow-x:hidden; overflow-y:scroll; position:absolute; top:22px; right:0px; height:118px; padding-bottom:10px;" onscroll='divYScroll(this);'>            <div style="width:1px; height:194px;"></div>         </div>    </div>   </div></body></html>
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    一、总体结构:

            页面基本元素为DIV+TABLE,固定的列采用绝对定位的方式固定,每一列都要指定固定宽度,为了解决横竖滚动条的问题,表头和表体的外面分别包裹两层DIV,滚动条采用虚拟的方式,固定在固定位置通过JS控制模拟正常DIV滚动条的效果。

    二、定位:

            固定的列要绝对定位,通过left属性控制左侧位移,为了保证固定列浮动在上方,设置z-index为1,。为了保证有竖滚动条时的正常显示,表体的外层DIV为绝对定位,由此导致滚动条也都要绝对定位。还有,表头和表体以及滚动条的内层DIV通过margin-left属性控制左侧外边距,把固定列的偏移量空余出来。

    二、宽度计算:

            每一列的宽度都要指定固定的值,并且要注意一个关键点,就是还要加上min-width和max-width属性,这两个属性和width值相等,表头表体的内层DIV,宽度为auto,自适应表格宽度,外层DIV宽度为100%,最外层的DIV通过padding-right属性控制右侧内边距,将竖滚动条的位置空余出来。

    三、高度计算:

            因为绝对定位的存在,整个表格组件的高度要指定,可以通过计算得出,

    四、滚动条:

            本方案一个突出特点,就是虚拟的滚动条,就是通过一个和表格一样宽、高度为一个像素的DIV模拟出表体DIV的横向滚动条,竖滚动条同理。之所以采用这个形式,一个是横向滚动条这样处理比较美观,竖滚动条这样处理之后,表头和表体的DIV宽度不用计算了,都为100%,否则存在滚动条时,表头和横向滚动条要空出竖滚动条宽度的位移,这个计算倒不复杂,但是某些情况下存在问题,在此不展开了。

    五、滚动事件:

            因为表体的滚动条都隐藏了,导致鼠标滚轮不起作用了,这样就需要用JS处理鼠标滚轮事件,本文的样例代码兼容常见浏览器。

    六、优缺点分析:

            本文的解决方案已经经过我们的精简,重点是讲清楚原理,在我们的实际中,非常的复杂。

            这个方案的优点是,如果要做组件的话,因为HTML结构简单,JS控制代码非常干净,维护容易。缺点就是计算过多。我们认为该方案比较适用于开发组件的情况,静态页面并不适用。


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