js二级联动问题

在选择1group 最右边的窗口出现a和s选择2group 最右边的窗口出现f和g
要怎么实现啊很急~<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>选择项目组成员</title>
<link rel="stylesheet" type="text/css" href="bg.css" media="screen" /><script language="javascript">function Add(){
  if(dltProject.selectedIndex==-1) {alert("请选择项目名称!");return;};
  if(dltDepartment.selectedIndex==-1) {alert("请选择技术部门！");return;};
  if(dltMember.selectedIndex==-1) {alert("请选择组员!");return;};  var newRowPos=tbCondition.rows.length;
  if(curRow) newRowPos=curRow.rowIndex+1;  var newRow=tbCondition.insertRow(newRowPos);
  newRow.attachEvent("onclick",SelectRow);  var newCell=newRow.insertCell();
  newCell.attachEvent("onclick",EditTd);  newCell=newRow.insertCell();
  newCell.attachEvent("onclick",EditTd);  newCell=newRow.insertCell();
  newCell.attachEvent("onclick",EditTd);  newRow.insertCell();
  newRow.cells[0].innerText=dltProject.value;
  newRow.cells[1].innerText=dltDepartment.value;
  newRow.cells[2].innerText=dltMember.value;
  newRow.cells[3].innerHTML='<input type="button" value="删除" onclick="this.parentNode.parentNode.removeNode(true)">';
  newRow.click();}//编辑单元格
function EditTd(){
  var src=window.event.srcElement;
  if(src.tagName!="TD") return;
  var strVal=src.innerText;
  src.innerHTML='<input type="text" style="width:100%" onblur="EditEnd(this)" value="'+strVal+'">';
  src.children[0].focus();
}//编辑结束,复原单元格
function EditEnd(src){
  var strVal=src.value;
  var objTd=src.parentElement;
  objTd.innerHTML="";
  objTd.innerText=strVal;
}var curRow=null;
function SelectRow(){
  var clickrow=window.event.srcElement;
  while(clickrow.tagName!="TR"){
    clickrow=clickrow.parentElement;
  }
  //alert(clickrow.tagName);
  if(curRow)
    curRow.style.backgroundColor ="#FFFFFF";
    clickrow.style.backgroundColor ="#0099FF";
    curRow=clickrow;
    btnUp.disabled=false;
    btnDown.disabled=false;
  }//移动行
function Move(flag){
  var len=tbCondition.rows.length;
  if(len==1){
    alert("只有一行，无法移动!"); 
    return;
  }
  else if(curRow.rowIndex==len-1 && flag==1){
    alert("最后一行，无法下移!"); 
    return;
  }
  else if(curRow.rowIndex==0 && flag==-1){
    alert("第一行，无法上移!"); 
    return;
  }
  else{
    var chgRow=tbCondition.rows[curRow.rowIndex+flag];
    for(var i=0;i<3;i++){
      var strTd=curRow.cells[i].innerHTML;
      curRow.cells[i].innerHTML=chgRow.cells[i].innerHTML;
      chgRow.cells[i].innerHTML=strTd;
    }
    chgRow.click();
  }
}
     
 </script>
</head><body>
<table width="1022"  border="1" cellspacing="0" cellpadding="0">
  <tr>
    <td width="387" height="140">
      <select name="Project" size="10" id="dltProject" style="width:100% ">
        <option value="Project1" selected>Project1</option>
        <option value="Project2"> Project2</option>
        <option value="Project3"> Project3</option>
                          </select></td>
    <td width="435">

      <select name="Department" id="dltDepartment" size="10" style="width:100% " >
        <option value="1Group" selected>1Group</option>
        <option value="2Group">2Group</option>
<option value="3Group">3Group</option>
<option value="4Group">4Group</option>
<option value="5Group">5Group</option>

      </select></td>
    <td width="192">
      <select name="Member" id="dltMember" size="10" style="width:100% ">
      
       <option value="a" selected>a</option>
        <option value="s">s</option>
<option value="d">d</option>
        <option value="f">f</option>
        <option value="g">g</option>
<option value="h">h</option>
        <option value="t">t</option>
        
      </select></td>
  </tr>
<tr>
    <td height="30"><input name="btnAdd" type="button" value="添加" onClick="Add()"></td> 
    <td><input name="btnUp" type="button" value="上移" onClick="Move(-1)" disabled></td>
    <td><input name="btnDown" type="button" value="下移" onClick="Move(1)" disabled></td>
</tr>
</table>
<br>
<table id="tbCondition" width="97%"  border="1" cellspacing="0" cellpadding="0">
  <tr>
    <td width="36%">Project1</td>
    <td width="41%">1Group</td>
    <td width="12%">a</td>
    <td width="11%"><input type="button" value="删除" onclick="this.parentNode.parentNode.removeNode(true)"></td>
  </tr>      
</table>
</body>
</html>

解决方案 »

  1.   

    对 Department select 添加鼠标左键单击事件的监听
    根据 Department 当前选中 option 的不同
    按照你自己的需求 去对  Member select 中的option 进行隐藏操作。具体代码网上应该有多少  google耐心的找一下总会有的
      

  2.   

    <html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=gb2312">
        <title>选择项目组成员 </title>
        <link rel="stylesheet" type="text/css" href="bg.css" media="screen" /><script language=javascript>
        function groupSelecter(myObject) {
            var subSelect = document.getElementById("dltMember");
            subSelect.options.length = 0;
            switch (myObject.value) {
                case "1Group":
                    subSelect.options.add(new Option("a", "a"));
                    subSelect.options.add(new Option("s", "s"));
                    subSelect.value = "a"; 
                    break;
                case "2Group":
                    subSelect.options.add(new Option("f", "f"));
                    subSelect.options.add(new Option("g", "g"));
                    subSelect.value = "f";
                    break;
                default:
                    subSelect.options.add(new Option("a", "a"));
                    subSelect.options.add(new Option("s", "s"));
                    subSelect.options.add(new Option("f", "f"));
                    subSelect.options.add(new Option("g", "g"));
                    subSelect.options.add(new Option("h", "g"));
                    subSelect.options.add(new Option("t", "t"));
                    subSelect.value = "a";
                    break;
            }
        }
    </script>
    </head>
    <body onload="groupSelecter(document.getElementById('dltDepartment'));">
        <table width="1022" border="1" cellspacing="0" cellpadding="0">
            <tr>
                <td width="435">
                    <select name="Department" id="dltDepartment" size="10" style="width: 100%" onchange="groupSelecter(this);">
                        <option value="1Group" selected>1Group </option>
                        <option value="2Group">2Group </option>
                        <option value="3Group">3Group </option>
                        <option value="4Group">4Group </option>
                        <option value="5Group">5Group </option>
                    </select>
                </td>
                <td width="192">
                    <select name="Member" id="dltMember" size="10" style="width: 100%">
                    </select>
                </td>
            </tr>
        </table>
    </body>
    </html>