实现Ecshop左侧商品分类导航特效

Ecshop的左侧导航在模板文件夹下的library的category_tree.lbi文件，因为echsop首页的子分类页都将调用该页面，为实现首页的侧导航特效，我们新件一文件，命名：category_tree_index.lbi，然后在首页调用即可。
Html代码如下：
<div id="category_tree">
  <h3 id="category_h3"><span>商品导航</span></h3>
  <ul class="i_sort_list">
      <!--{foreach from=$categories item=cat name=key}-->
       <li class="cate_li" id="li_i_item_{$cat.id}" onmouseover="OversetTab({$cat.id},{$smarty.foreach.key.iteration})" onMouseOut="OutsetTab({$cat.id})">
          <h4 class="i_tit"><span class="i_wrap"><a href="{$cat.url}">{$cat.name|escape:html}</a><a class="i_bg"></a><span class="i_jian">&gt;</span></span></h4>
             <div class="child_cont" id="div_i_item_{$cat.id}" style="display:none">
               <!--{foreach from=$cat.cat_id item=child name=no}-->
                           <dl>
                                   <dt>
                                         <a href="{$child.url}" hidefocus="true">{$child.name|escape:html}</a>
                                   </dt>
                                   <dd class="i_row1">
                                      <!--{foreach from=$child.cat_id item=children name=no}-->
                                                 <a href="{$children.url}" hidefocus="true">{$children.name|escape:html}</a>
                                         <!--{/foreach}-->
                                  </dd>
                           </dl>
                    <!--{/foreach}-->
             </div>
      </li>
       <!--{/foreach}-->
  </ul>
  </div>
 
CSS样式代码如下：
#category_tree .i_sort_list{background:#fff;zoom:1}
#category_tree .i_sort_list .cate_li{zoom:1;vertical-align:top}
#category_tree .i_sort_list .cate_li .i_tit{height:38px;position:relative;font-size:14px;color:#973a36;font-weight:normal;margin:0 10px; font-weight:bold}
#category_tree .i_sort_list .cate_li .i_tit a{color:#76292f;}
#category_tree .i_sort_list .cate_li .i_tit .i_wrap{position:absolute;top:0;left:-10px;padding:10px 0 10px 0;width:208px;display:block;font-family:"SimSun";text-indent:10px;*zoom:1}
#category_tree .i_sort_list .cate_li .i_tit .i_wrap:hover{background:#fff;}
#category_tree .i_sort_list .cate_li .i_tit .i_jian{position:absolute;top:10px;right:10px;font-family:"SimSun";color:#b4b0ad}
#category_tree .i_sort_list .cate_li .child_cont{background:#fff;overflow:hidden;zoom:1;display:none;border:1px solid #e71d1d;position:absolute;margin-top:-76px;margin-left:206px;z-index:4}
 
#category_tree .i_sort_list .cate_li dl{padding:4px 0;zoom:1;line-height:22px}
#category_tree .i_sort_list .cate_li dl:after{content:'';display:block;clear:both;height:0;visibility:hidden}
#category_tree .i_sort_list .cate_li dt{float:left;width:90px;font:bold 12px/23px Arial;overflow:hidden}
#category_tree .i_sort_list .cate_li dt a:link,#category_tree .i_sort_list .cate_li dt a:visited{color:#cb1108}
#category_tree .i_sort_list .cate_li dt a:hover{color:#8d0700}
#category_tree .i_sort_list .cate_li dd{float:left;width:280px;white-space:normal;word-break:break-all;zoom:1;overflow:hidden;margin-top:-2px;}
#category_tree .i_sort_list .cate_li dd a{margin-left:4px;}
#category_tree .i_item_status_on .i_tit{z-index:6}
#category_tree .i_item_status_on .i_tit .i_wrap{background-color:#fff;text-decoration:none;top:-1px;left:-11px;border:1px solid #e71d1d;border-left:none;border-right:none;margin:0;width:184px;cursor:default}
#category_tree .i_item_status_on .i_tit .i_jian{display:none}
#category_tree .i_item_status_on .child_cont{display:block;width:400px}
#category_tree .i_nav_sort.i_status_on{height:auto}
 
JS代码很简单如下：
<script type="text/javascript">
function OversetTab(id,k){
     document.getElementById("li_i_item_"+id+"").className = "cate_li i_item_status_on";
    document.getElementById("div_i_item_"+id+"").style.display = "block";
     if(document.getElementById("div_i_item_"+id+"").offsetHeight < k*38){
        document.getElementById("div_i_item_"+id+"").style.margin = "-56px 0 0 206px";
     }else{
        document.getElementById("div_i_item_"+id+"").style.margin = "-"+k*38+"px 0 0 206px";
     }
}
function OutsetTab(id){
    document.getElementById("li_i_item_"+id+"").className = "cate_li";
    document.getElementById("div_i_item_"+id+"").style.display = "none";
}
</script>

最后实现效果如下：