Easyui Two-level linkage

JQuery (function () {  Provincial$(' #province '). ComboBox ({ Valuefield:' Itemvalue ',Value field TextField:' Itemtext ',The fields displayed Url:'/user/sort/province_list ', Panelheight:' Auto ', RequiredTrue EditableTrueNot editable, only select Value' ${user.province} ', OnChange:function (province) {  $ (' #city '). ComboBox (' Clear '); $(' #city '). ComboBox ({  Valuefield:' Itemvalue ',Value field  TextField:' Itemtext ',The fields displayed  Url:'/user/sort/city_list?province= ' +province,  Panelheight:' Auto ',  RequiredTrue  EditableTrueNot editable, only select  Value'--Please choose--' }); } }); County city $(' #city '). ComboBox ({ Valuefield:' Itemvalue ',Value field TextField:' Itemtext ',The fields displayed Url:'/user/sort/city_list?province=${user.province} ', Panelheight:' Auto ', RequiredTrue EditableTrueNot editable, only select Value' ${user.city} ' });});form table <tr><Tdalign="Right" > Regional provincial level</Td><Tdalign="Left" ><InputType="Text"Id="Province"Name="Province"style="Width:128px"class="Easyui-validatebox"Validtype="Selectvalid["--Please Choose--'] "/></Td></Tr><Tr><td align= "right" > District Districts </td> <td align= "Left" > <input span class= "attribute" >type= "text" id= "city" span class= "attribute" >name= "City" style= "width: 128px "class=" Easyui-validatebox "validtype=  "selectvalid["--Please Select--'] "/> </td> </TR>            

Easyui Two-level linkage