Hi! Can anyone help me with my datagrid..Please!
All are functioning properly except my Save button... Whenever I create new user or edit user information then I clicked SAVE button it doesn't save.. It seems that the error is in part of saveuser() function in my script, but I don't how to debug it.. Please help me. 

Here is my Script:                
<script type="text/javascript">
			$(function(){
			$('#dg').datagrid({
			pageSize:25,
			pageList:[25,50,75,100]
			});
		});
		
		var url;
		function newUser(){
			$('#dlg').dialog('open').dialog('setTitle','New Computer Information');
			$('#fm').form('clear');
			url = 'dissave.php';
			obj1 = document.getElementById('exportword');
			obj1.style.visibility = 'hidden';
			obj2 = document.getElementById('exportexcel'); 
			obj2.style.visibility = 'hidden';
			obj3 = document.getElementById('printdoc'); 
			obj3.style.visibility = 'hidden';
		}
		function editUser(){
			var row = $('#dg').datagrid('getSelected');
			if (row){
				$('#dlg').dialog('open').dialog('setTitle','Edit Computer Information');
				$('#fm').form('load',row);
				url = 'disupdate.php?id='+row.id;
			}
			obj1 = document.getElementById('exportword');
			obj1.style.visibility = 'visible';
			obj2 = document.getElementById('exportexcel'); 
			obj2.style.visibility = 'visible';
			obj3 = document.getElementById('printdoc'); 
			obj3.style.visibility = 'visible';
		}
		function saveUser(){
			$('#fm').form('submit',{
				url: url,
				onSubmit: function(){
					return $(this).form('validate');
				},
				success: function(result){
					var result = eval('('+result+')');
					if (result.success){
						
						$('#dlg').dialog('close');		// close the dialog
						$('#dg').datagrid('reload');	// reload the user data
					} else {
					
						$.messager.show({
							title: 'Error',
							msg: result.msg
						});
					}
				}
			});
		}
		function removeUser(){
			var row = $('#dg').datagrid('getSelected');
			if (row){
				$.messager.confirm('Confirm','Are you sure you want to remove this user?',function(r){
					if (r){
						$.post('disremove.php',{id:row.id},function(result){
							if (result.success){
								$('#dg').datagrid('reload');	// reload the user data
							} else {
								$.messager.show({	// show error message
									title: 'Error',
									msg: result.msg
								});
							}
						},'json');
					}
				});
			}
		}
		function doSearch(){
		 if (window.event.keyCode == 13){
			$('#dg').datagrid('load',{
				search1: $('#search1').val(),
				
			});
			
			 }
		}
		function doSearch1(){
		
			$('#dg').datagrid('load',{
				search1: $('#search1').val(),
				
			});
			
			 
		}
		
		
		
		
		
		function logout(){
			var conlog = confirm("Are you sure you wish to logout?");
			if (conlog){
				return true;
			}
			else{
				return false;
			}
		}
		
		
		
		
	   </script>
Here is my datagrid html code with edit form:          
<div id='middle'>
		<table border='0' align='center' style="border-collapse:collapse" >
			<tr height='30px'>
				<td></td>
			</tr>
			<tr>
				<td>
				<!-- datagrid-->
					<table id="dg" class="easyui-datagrid" style="width:1100px;height:740px"
							url="disget.php" 
							toolbar="#toolbar" pagination="true"
							rownumbers="true" fitColumns="false" singleSelect="true" nowrap="true">
					<thead>
						<tr>
							
							<th field="item" auto="true" sortable='true' editor="{type:'validatebox',options:{required:true}}">Item Name</th>
							<th field="brand" sortable="true" auto="true" editor="{type:'validatebox',options:{required:true}}">Brand Name</th>
							<th field="model" sortable="true" auto="true" editor="text">Model Name</th>
							<th field="color" sortable="true" auto="true" editor="text">Color</th>
							<th field="desc" sortable="true" auto="true" editor="text">Item Description</th>
							<th field="serial" sortable="true" auto="true" editor="text">Serial No.</th>
				
							<th field="date" sortable="true" auto="true" editor="text">Date Given</th>
							<th field="dept" sortable="true" auto="true" editor="text">Department</th>
							<th field="status" sortable="true" auto="true" editor="text">Status</th>
							<th field="others" sortable="true" auto="true" editor="text">Others/Problems</th>
							<th field="history" sortable="true" auto="true" editor="text">Item History</th>
						</tr>
					</thead>
				</table>
				<div id="toolbar">
					<a href="#" class="easyui-linkbutton" iconCls="icon-add" plain="true" onclick="newUser()">New Item Information</a>
					<a href="#" class="easyui-linkbutton" iconCls="icon-edit" plain="true" onclick="editUser()">Edit/Print Item Information</a>
					<a href="#" class="easyui-linkbutton" iconCls="icon-remove" plain="true" onclick="removeUser()">Delete</a>
					<a href="#" class="easyui-linkbutton" iconCls="icon-print2" plain="true" onclick="printsample()">Print</a>
					<input id="search1" style="line-height:26px;border:1px solid #ccc" hidden='true'>
					
					
			
				</div>
	
				<div id="dlg" class="easyui-dialog" style="width:680px;height:700px; background:#f1f1f1"
						closed="true" buttons="#dlg-buttons">
						
				<!-- FORM -->
				
					<form id="fm" method="post" novalidate>
					<div class="fitem"><br>
					<table border='0' align='center' style='font-size:12px;
						font-weight:bold;' cellpadding='10px'>
						<tr>
							<td>Item Name<br><input style='padding-left: 10px;height: 30px;width: 267px;' name="item" class="easyui-validatebox" required="false"></td><td>
							<br><input style='height: 30px;width: 20px;'  name="id" id="computerid" hidden='true'>
							</td><td>Date Given<br><input style='padding-left: 10px;height: 30px;width: 267px;'  name="date"></td>
						</tr>
						<tr>
							<td colspan='2'>Brand Name<br><input style='padding-left: 10px;height: 30px;width: 267px;'  name="brand"></td>
							<td>Model Name<br><input style='padding-left: 10px;height: 30px;width: 267px;'  name="model"></td>
						</tr>
						<tr>
							<td colspan='2'>Color<br><input style='padding-left: 10px;height: 30px;width: 267px;'  name="color"></td>
							<td>Serial No.<br><input style='padding-left: 10px;height: 30px;width: 267px;'  name="serial"></td>
						</tr>
						<tr>
							<td>Department<br>
							
					
							<select style='padding-left: 10px;height: 30px;width: 267px;' name='dept'>
							<option value="MIS">Management Information System</option>
							<option value="Crew">Personal Injury</option>
							<option value="Marine">Marine Claims</option>
							<option value="Billing">Billing</option>
							<option value="Treasury">Treasury</option>
							<option value="HRD">Human Resources</option>
							<option value="OP">Office of the President</option>
							<option value="OEVP">Office of the Executive Vice President</option>
							<option value="Accounting">Accounting</option>
							<option value="Endorsement">Endorsement</option>
							<option value="Medical">Medical</option>
							</select>	
							
							</td></td><td>
							<td>Status<br><input style='padding-left: 10px;height: 30px;width: 267px;'  name="status"></td>
						</tr>
						<tr>
							<td colspan='2' valign='top'>Item Description<br><textarea rows="6" cols="31" name='desc' ></textarea></td>
							<td valign='top'>Others/Problems<br><textarea rows="6" cols="31" name='others' placeholder='*include date'></textarea></td>
						</tr>
						<tr>
							
							<td colspan='3' valign='top'>Item History<br><textarea rows="6" cols="70" name='history' placeholder='*include date'></textarea></td>
						</tr>
						
					</table>
					</div>
					
					
						
					</form>
				</div>
				<div id="dlg-buttons">
					<a href="#" class="easyui-linkbutton" id ="exportword" iconCls="icon-word" onclick="doExportword()">Word</a>
					<a href="#" class="easyui-linkbutton" id ="exportexcel" iconCls="icon-excel" onclick="doExportexcel()">Excel</a>
					<a href="#" class="easyui-linkbutton" id ="printdoc" iconCls="icon-print" onclick="doPrint()">Print</a>
					<a href="#" class="easyui-linkbutton" iconCls="icon-ok" onclick="saveUser()">Save</a>
					<a href="#" class="easyui-linkbutton" iconCls="icon-cancel" onclick="javascript:$('#dlg').dialog('close')">Cancel</a>
				</div>
					<!-- datagrid-->
				</td>
			</tr>
			<tr height='30px'>
				<td></td>
			</tr>
		</table>
	</div>