Javascript 下拉列表多选

DropDownList 不能多选,要多选,只能用ListBox或是HTML的select(参数加个multiple )

Script 代码

     <script language="javascript">
        function Test()
        {
            o = document.getElementById("lbTest");
            var intvalue="";
            for(i=0;i<o.length;i++){  
                if(o.options[i].selected){
                    intvalue+=o.options[i].value+",";
                }
            }
            alert( intvalue.substr(0,intvalue.length-1) );

        }
    </script>

 

HTML代码

        <asp:ListBox ID="lbTest" runat="Server" SelectionMode="Multiple">
            <asp:ListItem Text="11" Value="1"></asp:ListItem>
            <asp:ListItem Text="22" Value="2"></asp:ListItem>
            <asp:ListItem Text="33" Value="3"></asp:ListItem>
        </asp:ListBox>

   或是

        <select name="lbTest " size=8 multiple>
            <option value="0" selected>请选择
            <option value="1">测试一
            <option value="2">测试二
            <option value="3">测试三
            <option value="4">测试四
            <option value="5">测试五
        </select>