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关于如何动态地在同一页面实现两个<select>互传

March 25,2004

                  （jaklin 2000.9.12)

hello! 先祝大家中秋节快乐！

我们常常会碰到这样一个问题：如何将在同一页面上的一个<select>或<listbox>的值传到另一个<select>或<listbox>中？这是一个很烦人的问题。可是有时候你偏偏会遇到。那什么办呢？

   下面是我“烟酒”了一个上午，现贴上来让大家共享。用的方法是很笨也挺麻烦。不过总是有点成就感的。呵呵！大家看看，指点指点.....

<%@ Language=VBScript %>
<HTML>
<HEAD>
<META NAME="GENERATOR" Content="Microsoft Visual Studio 6.0">
</HEAD>
<script language="vbscript">

</script>
<body bgcolor="#ffffff">
<form name="form1"  action="test01.asp" target="_self">
<p><TEXTAREA id=text01 name=text01></TEXTAREA></p>
<table>
<tr>
   <td>
   <select name="select1" language="javascript" size=5>
<option value=11111>11111</option>
<option value=22222>22222</option>
<option value=33333>33333</option>
   </select>
   </td>
   <td>
<label onClick=do_select()><font color=#ff00dc><u>->> </u></font> </label><br><br>
<label onClick=do_select2()><font color=#ff00dc><u><<- </u></font> </label>
   </td>
<%
   str="function do_select() {" & vbCrlf & _
         "if (document.form1.select1.options.length > 0) {"&vbCrlf&_
      "var j=0;"&vbCrlf&_
      "for(var i=0;i<document.form1.select1.options.length;i++) {"&vbCrlf & _
      "if(document.form1.select1.options(i).selected) {"&vbCrlf& _
         "j=j+1; break" & vbCrlf & "}"&vbCrlf & "}"&vbCrlf& _
      "if (j > 0) {"&vbCrlf&_                   "document.form1.sel2.options[document.form1.sel2.options.length] = new Option(" &  _
            "document.form1.select1.options[document.form1.select1.selectedIndex].value,"  & _
            "document.form1.select1.options[document.form1.select1.selectedIndex].value);"& vbCrlf
Response.Write "<td><SELECT id=sel2  name=sel2 size=5>"
Response.Write "</select></td>"
      str=str&vbCrlf&"document.form1.select1.options[document.form1.select1.selectedIndex]=null;"&vbCrlf & _
"if (document.form1.select1.options.length > 1) {"&vbCrlf '&_
str=str&vbCrlf & "}" & vbCrlf & "}" & vbCrlf& "}" & vbCrlf& "}" & vbCrlf
Response.Write "<SCR"& "IPT LANGUAGE=""JavaScript"">" & vbCrlf
Response.Write str & vbCrlf & "</SCR"&"IPT>"& vbCrlf

      %>

<%
str=""
str="function do_select2() {" & vbCrlf & _
"if (document.form1.sel2.options.length > 0) {"&vbCrlf&_
"var j=0;"&vbCrlf&_
"for(var i=0;i<document.form1.sel2.options.length;i++) {"&vbCrlf & _
"if(document.form1.sel2.options(i).selected) {"&vbCrlf& _
"j=j+1; break" & vbCrlf & "}"&vbCrlf & "}"&vbCrlf& _
"if (j > 0) {"&vbCrlf&_
            "document.form1.select1.options[document.form1.select1.options.length] = new Option(" &  _
            "document.form1.sel2.options[document.form1.sel2.selectedIndex].value,"  & _
            "document.form1.sel2.options[document.form1.sel2.selectedIndex].value);"& vbCrlf
         str=str&"document.form1.sel2.options[document.form1.sel2.selectedIndex] =null;" & vbCrlf &"}"& vbCrlf &"}"& vbCrlf &"}"
Response.Write "<SCR"& "IPT LANGUAGE=""JavaScript"">" & vbCrlf
Response.Write str & vbCrlf & "</SCR"&"IPT>"& vbCrlf
%>

   </tr>
  </table>
</form>
</body>
</HTML>

   很笨吧，哈哈！
   若那位大虾有更好的方法，可别忘了给我寄上一份哦。
   E_Mail: [email protected]