AJAX(DWR框架) 实现搜索自动补全 类似google,baidu

 1. DAO里写好根据商品名模糊查找,返回一个String[] 数组 的方法

public String[] findbyname(String name){
   Session sess=HibernateSessionFactory.getSession();
  String [] goodsname = null;
   try {
    String hql="select a from TGoods a where a.goodsnum-a.sellnum>0 and a.goodsname like '%"+name+"%' order by a.scannum desc";
    Query q=sess.createQuery(hql);
    q.setFirstResult(0);
    q.setMaxResults(8);
    List list=q.list();
    if(!list.isEmpty()){
     List<TGoods> g = list;
    goodsname = new String [g.size()];
     for (int i=0;i<list.size();i++) {
      goodsname[i] = g.get(i).getGoodsname();           //把商品名字放到数组里
     }
    }
   
   } catch (Exception e) {
    e.printStackTrace();
   }finally{
    HibernateSessionFactory.closeSession();
    return goodsname;
   }
}

2.配置DWR.XML (具体请看http://hi.baidu.com/stream1990/blog/item/ca6d330665afbec77b8947c3.html)

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting
2.0//EN" "http://www.getahead.ltd.uk/dwr/dwr20.dtd" >
<!-- <!DOCTYPE dwr SYSTEM "dwr20.dtd" > -->
<dwr>
   <allow>
          <create creator="new" javascript="findbyname">
       <param name="class" value="com.dao.TGoodsDAO" />
     </create>
    
   </allow>
</dwr>

3.最重要的来了,很多人可能都卡在这了吧

<script type='text/javascript' src='/shops/dwr/interface/findbyname.js'></script>
<script type='text/javascript' src='/shops/dwr/engine.js'></script>
<script type='text/javascript' src='/shops/dwr/util.js'></script>
<script>
    function gog()
    {
         var keys = document.getElementById("keys").value;
         
            findbyname.findbyname(keys,call1);
    }
    
    function call1(data)    
    {
    if(data!=null){                                                             //当查询结果没数据时,不写这句会报错的
      var keys = document.getElementById("keys").value;
    keys=keys.replace(/(^\s*)|(\s*$)/g,"");                        //这个是去掉空格,正则功能很强大的
       if(keys != ""){                                                          //如果不判断,一按下键就会有8条数据
       document.getElementById("tishi").innerHTML = "";
        for(var i=0;i<data.length;i++){
          document.getElementById("tishi").innerHTML+="<div onclick=" + "document.getElementById('keys').value=this.innerText" + " onmouseout=" + "this.style.backgroundColor=''"+ " onmouseover=" + "this.style.backgroundColor='#3266CC'>" +data[i] + "</div>" ;           //写这语句的时候小心,别写错了
            
        }
     }else{
     document.getElementById("tishi").innerHTML = "";
     } 
    }else{
    document.getElementById("tishi").innerHTML = "";
    }
    
    }
    
</script>

这样就OK了,实现并不难,但做的时候心要很细,最后,还有一点,baidu,google是从第一个字开始匹配,但我加的测试数据不多,所以用了两个%关键字% ,要想做的和baidu,google一们,只要HQL那里改成 关键字% 就可以了,还有,用键盘的上下键功能用javascript就可以实现,这里没做,

哦,对了,还有静态页面,里头触发事件用的是onkeyup ,还有几个类似功能的也可以

<TABLE cellPadding=4 width="100%" border=0>
                          
                         <tr>
                         <td valign="top">关键字：</td>
                         <td>
                            <table>
                             <tr>
                              <td><input type="text" name=goodsname id="keys" onkeyup="gog()" size="60"></td>
                             </tr>
                             <tr>
                              <td bgcolor="#F6F6EE"><div id="tishi" ></div></td>
                             </tr>
                            </table>
                         </td>
                         </tr>   
</table>