form表单无法传值是什么情况

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<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<div class="easyui-layout" data-options="fit:true">
<!-- Begin of toolbar -->
<div id="wu-toolbar">
<div class="wu-toolbar-button">
<a href="#" class="easyui-linkbutton" iconCls="icon-add" onclick="openAdd()" plain="true">添加</a>
<a href="#" class="easyui-linkbutton" iconCls="icon-edit" onclick="openEdit()" plain="true">修改</a>
<a href="#" class="easyui-linkbutton" iconCls="icon-remove" onclick="remove()" plain="true">删除</a>
</div>
<div class="wu-toolbar-search">
<label>菜单名称：</label><input class="wu-text" style="width:100px">
<a href="#" class="easyui-linkbutton" iconCls="icon-search">搜索</a>
</div>
</div>
<!-- End of toolbar -->
<table id="data-datagrid" class="easyui-datagrid" toolbar="#wu-toolbar"></table>
</div>
<!-- Begin of easyui-dialog -->
<div id="add-dialog" class="easyui-dialog" data-options="closed:true,iconCls:'icon-save'" style="width:450px; padding:10px;">
<form id="add-form" method="post">
<table>
<tr>
<td width="60" align="right">菜单名称:</td>
<td><input type="text" name="name" class="wu-text easyui-validatebox" data-options="required:true, missingMessage:'请填写菜单名称'" /></td>
</tr>
<tr>
<td align="right">上级菜单:</td>
<td>
<select name="parentid" class="easyui-combobox" panelHeight="auto" style="width:268px">
<option value="0">顶级分类</option>
</select>
</td>
</tr>
<tr>
<td align="right">菜单URL:</td>
<td><input type="text" name="url" class="wu-text" /></td>
</tr>
<tr>
<td align="right">菜单图标:</td>
<td>
<input type="text" name="icon" class="wu-text easyui-validatebox" data-options="required:true, missingMessage:'请填写菜单图标'" />
</td>
</tr>
</table>
</form>
</div>
<!-- End of easyui-dialog -->
<script type="text/javascript">
/**
* Name 添加记录
*/
function add(){
var validate = $("#add-form").form("validate");
if(!validate){
$.messager.alert("消息提醒","请检查你的输入数据！","warning");
return;
}
var data = $("add-form").serialize();
$.ajax( {
url:'../admin/menu/add',
dataType:'json',
type:'post',
data:data,
success:function(data){
if(data.type == 'success' ){
$.messager.alert('信息提示','添加成功！','info');
$('#add-dialog').dialog('close');
}
else
{
$.messager.alert('信息提示',data.msg,'warning');
}
}
});
}

/**
* Name 修改记录
*/
function edit(){
$('#wu-form-2').form('submit', {
url:'',
success:function(data){
if(data){
$.messager.alert('信息提示','提交成功！','info');
$('#wu-dialog-2').dialog('close');
}
else
{
$.messager.alert('信息提示','提交失败！','info');
}
}
});
}

/**
* Name 删除记录
*/
function remove(){
$.messager.confirm('信息提示','确定要删除该记录？', function(result){
if(result){
var items = $('#wu-datagrid-2').datagrid('getSelections');
var ids = [];
$(items).each(function(){
ids.push(this.productid);
});
//alert(ids);return;
$.ajax({
url:'',
data:'',
success:function(data){
if(data){
$.messager.alert('信息提示','删除成功！','info');
}
else
{
$.messager.alert('信息提示','删除失败！','info');
}
}
});
}
});
}

/**
* Name 打开添加窗口
*/
function openAdd(){
$('#add-form').form('clear');
$('#add-dialog').dialog({
closed: false,
modal:true,
title: "添加菜单信息",
buttons: [{
text: '确定',
iconCls: 'icon-ok',
handler: add
}, {
text: '取消',
iconCls: 'icon-cancel',
handler: function () {
$('add-dialog').dialog('close');
}
}]
});
}

/**
* Name 打开修改窗口
*/
function openEdit(){
$('#wu-form-2').form('clear');
var item = $('#wu-datagrid-2').datagrid('getSelected');
//alert(item.productid);return;
$.ajax({
url:'',
data:'',
success:function(data){
if(data){
$('#wu-dialog-2').dialog('close');
}
else{
//绑定值
$('#wu-form-2').form('load', data)
}
}
});
$('#wu-dialog-2').dialog({
closed: false,
modal:true,
title: "修改信息",
buttons: [{
text: '确定',
iconCls: 'icon-ok',
handler: edit
}, {
text: '取消',
iconCls: 'icon-cancel',
handler: function () {
$('#wu-dialog-2').dialog('close');
}
}]
});
}

/**
* Name 分页过滤器
*/
function pagerFilter(data){
if (typeof data.length == 'number' && typeof data.splice == 'function'){// is array
data = {
total: data.length,
rows: data
}
}
var dg = $(this);
var opts = dg.datagrid('options');
var pager = dg.datagrid('getPager');
pager.pagination({
onSelectPage:function(pageNum, pageSize){
opts.pageNumber = pageNum;
opts.pageSize = pageSize;
pager.pagination('refresh',{pageNumber:pageNum,pageSize:pageSize});
dg.datagrid('loadData',data);
}
});
if (!data.originalRows){
data.originalRows = (data.rows);
}
var start = (opts.pageNumber-1)*parseInt(opts.pageSize);
var end = start + parseInt(opts.pageSize);
data.rows = (data.originalRows.slice(start, end));
return data;
}

/**
* Name 载入数据
*/
$('#data-datagrid').datagrid({
url:'temp/datagrid.php',
loadFilter:pagerFilter,
rownumbers:true,
singleSelect:false,
pageSize:20,
pagination:true,
multiSort:true,
fitColumns:true,
fit:true,
columns:[[
{ checkbox:true},
{ field:'productid',title:'productid',width:100,sortable:true},
{ field:'productname',title:'productname',width:180,sortable:true},
{ field:'unitcost',title:'unitcost',width:100},
{ field:'listprice',title:'listprice',width:100},
{ field:'attr1',title:'attr1',width:100},
{ field:'itemid',title:'itemid',width:100},
{ field:'status',title:'status',width:100}
]]
});
</script>