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电梯直达

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发表于 2004-09-23 19:49 |只看该作者 |倒序浏览

我参考下面文章想做出联级菜单，改变第一级菜单时总是提示缺少对象错误，好像是因为方法Changelocation定义穿插了JSP代码，我用的是TOMCAT，不知道谁有碰到这样的问题！救命啊

实例演示:jsp+javascript打造级连菜单
来源： CSDN 作者： xhbmj
  <%@ page import="java.util.Date,yava.fileapp.*,java.sql.*;"
      contentType="text/html;charset=GB2312" pageEncoding="GB2312"
  %>;
  <style>;
  .f9{ font-size:9pt; }
  .bgc{ background-color:#AECAF9; color: #0033FF }
  .buttons{font-family:Arial; font-size:13px; font-weight:bold; background-color:#6796E4; color:white; border-top: solid 2px #AACAFB;
border-bottom: solid 1px #4E7DC1;
border-left: solid 1px #AECAF9;
border-right: solid 1px #5679BD;
padding:1px;
margin:0px;}
  </style>;
  <SCRIPT LANGUAGE="JavaScript">;
  ;
  </SCRIPT>;
  <body leftmargin="0" topmargin="0" marginwidth="0" marginheight="0">;
  <jsp:useBean id="user" scope="session" class="yava.fileapp.UserBean" />;
  <%
CDataSource ds=new CDataSource();  //数据联结Bean实例
java.sql.Connection conn=ds.getConnection();
java.sql.Statement stmt=null;
java.sql.ResultSet rs=null;
CDataCheck dc=new CDataCheck();
  %>;

  <%
String sqlu="SELECT t1.fno, t1.fname, t2.fname AS fdept FROM tuser t1 LEFT OUTER JOIN TDept t2 ON t1.fdept = t2.fno order by t2.fname";
stmt=conn.createStatement();
rs=stmt.executeQuery(sqlu);
  %>;
<script language='Javascript'>;
arr = new Array();
  <%  int temp=0;
while(rs.next())
{
  %>;
arr[<%=temp%>;]=new Array("<%=rs.getString("fname"%>;","<%=rs.getString("fdept"%>;";
  <%
temp = temp + 1;
}
  %>;
  temp=<%=temp%>;;
  function ChangeLocation(id){
  document.combo_box.city.length=0; //初始化第2级菜单的长度，下标从0开始
  var i = 0;
  document.combo_box.city.options[0]=new Option('-------','');
  for(i=0;i<temp;i++){
  if(arr[1]==id){//如果相等，证明在第2级里面有输入第1级组织的子集,arr[总数目][部门]
  document.combo_box.city.options[document.combo_box.city.length] = new Option(arr[0], arr[0]);
  }
  }
  }
  </script>;

  <form name="combo_box">;
  <table border="0" cellspacing="0" cellpadding="0" height="210" width="59">;
  <tr height="24">;
<td bgcolor="#336699" class="buttons" align=center>;<font color=#ffffff>;部门选择</font>;</td>;
<td bgcolor="#336699" class="buttons" align=center>;<font color=#ffffff>;人名选择</font>;</td>;
<td bgcolor="#336699" class="buttons" align=center nowrap>;<font color=#ffffff>;添加/移除</font>;</td>;
<td bgcolor="#336699" class="buttons" align=center>;<font color=#ffffff>;最终人</font>;</td>;
  </tr>;

  <tr>;
<td>;
<select multiple id=prov name="prov"  onchange="ChangeLocation(combo_box.prov.options[combo_box.prov.selectedIndex].text);"  style="width:150;height:200" class="bgc">;
  <option value="0">;请选择部门 --->;</option>;
  <%
String sqld="SELECT * FROM tdept";
stmt=conn.createStatement();
rs=stmt.executeQuery(sqld);
while(rs.next())
{
  %>;
  <option name="<%=rs.getString("fno"%>;">;<%=rs.getString("fname"%>;</option>;
  <%
}
  %>;
</select>;
</td>;
   <td>;
<select multiple id=city style="width:150;height:200" class="bgc">;
</select>;
</td>;
   <td nowrap align="center" class="bgc">;
  <input type="button" onClick="move(this.form.list2,this.form.city)" value="<<" class="buttons">;
  <input type="button" onClick="move(this.form.city,this.form.list2)" value=">;>;" class="buttons">;
</td>;
<td>;
  <select multiple size="10" name="list2" style="width:150;height:200" class="bgc">;
  </select>;
</td>;
  </tr>;
<tr class="bgc">;
<td colspan="4" align="center">;<input type="button" name="button1" class="buttons" value="选好了！" onclick="rv();">;</td>;
</tr>;
  </table>;
  </form>;

  <script language="JavaScript">;

  //人名移动
  function move(fbox, tbox) {
  var arrFbox = new Array();
  var arrTbox = new Array();
  var arrLookup = new Array();
  var i;
  for (i = 0; i < tbox.options.length; i++) {
  arrLookup[tbox.options.text] = tbox.options.value;
  arrTbox = tbox.options.text;
  }
  var fLength = 0;
  var tLength = arrTbox.length;
  for(i = 0; i < fbox.options.length; i++) {
  arrLookup[fbox.options.text] = fbox.options.value;
  if (fbox.options.selected && fbox.options.value != "" {
  arrTbox[tLength] = fbox.options.text;
  tLength++;
  }
  else {
  arrFbox[fLength] = fbox.options.text;
  fLength++;
   }
  }
  arrFbox.sort();
  arrTbox.sort();
  fbox.length = 0;
  tbox.length = 0;
  var c;
  for(c = 0; c < arrFbox.length; c++) {
  var no = new Option();
  no.value = arrLookup[arrFbox[c]];
  no.text = arrFbox[c];
  fbox[c] = no;
  }
  for(c = 0; c < arrTbox.length; c++) {
  var no = new Option();
  no.value = arrLookup[arrTbox[c]];
  no.text = arrTbox[c];
  tbox[c] = no;
   }
  }
  </script>;
  </body>;