JS传递两个参数到SERVLET，但有一个参数传不到

Question

function goGuoNei(){
 var currentPage= document.getElementById("zhuandao").value;
 document.form1.action ="/Zyw_New/indexManager?currentpage="+currentPage+"&typeId=1";
 document.form1.submit();
}
================================================================
<form name="form1" >
       <table class="table_pageBean">
       <%
                PageBean pb = (PageBean)request.getAttribute("pagebean"); 
                int totalPage = pb.getTotalpage();
                System.out.println(totalPage);
                if(pb!=null && pb.hasMorePage())
                {
                 pb.setURLPattern( "<a href=\"/Zyw_New/indexManager?typeId=1&currentpage=CURRENTPAGE\">TITLE</a>" );;
            %>
                <tr>
                    <td><%=pb.getFirstURL( "首页" ) %></td>
                    <td><%=pb.getPrevURL( "上一页" ) %></td>
                    <td>
             <%
              for(int i=0;i<totalPage;i++)
              { 
             %>
                    <a href="/Zyw_New/indexManager?currentpage=<%=i %>&typeId=1"><%=i+1 %></a>
             <%
              } 
             %>
              </td>
                    <td><%=pb.getNextURL( "下一页" ) %></td>
                    <td><%=pb.getLastURL( "末页" ) %></td>
                    <td> <input type="text" name="currentpage" class="zhuandao" id="zhuandao"/></td>
                    <td><a href="#">转到</a></td>
                    
                    <td><input type="button" class="zhuandao_button" value="OK" onClick="goGuoNei();"/></td>
                    
                </tr>
              <%
                 }
              %>
            </table>
            </form>

Answer 1

用alert语句检查currentPage在传入servlet时是否为空

Answer 2

在提交之前先alert(currentPage);看看是不是有值，如果有值，再到服务器检查

Answer 3

<form name="form1" method="post" >