jQuery使用EasyUi实现三级联动下拉框效果

<input id="txtPipeRowName" style="width:150px;">    <input id="txtPipeName" style="width:150px;"> 

// 一层Combo var srmCombx = $("#txtShouName")combobox({ loader:function(param,success,error){   $ajax({ url: '${CTX_ROOT}/TEquipmentsController?method=getEquipmentByParId&id='+selectSgId+'', dataType: 'json', success: function(data){ dataunshift({equipmentid:'',equipmentname:'全部'}); success(data); },         error: function(){ errorapply(this, arguments); } });   },   onSelect:function(record){ //onSelect 用户点击时触发的事件 在此的意义在于，用户点击一级后自动二级combobox   piperowCombxcombobox({ loader:function(param,success,error){   $ajax({ url: '${CTX_ROOT}/TEquipmentsController?method=getEquipmentByParId&id='+$("#txtShouName")combobox("getValue")+'', dataType: 'json', success: function(data){ dataunshift({equipmentid:'',equipmentname:'全部'}); success(data); },         error: function(){ errorapply(this, arguments); } });   },   onSelect:function(record){ //这里也使用了onSelect事件，在二级combobox被用户点击时触发三级combobox   pipeCombxcombobox({ loader:function(param,success,error){   $ajax({ url: '${CTX_ROOT}/TEquipmentsController?method=getEquipmentByParId&id='+$("#txtPipeRowName")combobox("getValue")+'', dataType: 'json', success: function(data){ dataunshift({equipmentid:'',equipmentname:'全部'}); success(data); },         error: function(){ errorapply(this, arguments); } });   },   valueField: 'equipmentid',     textField: 'equipmentname',   value:'',   editable:false });   },   onLoadSuccess:function(){ //清空三级下拉框 就是成功加载完触发的事件 当一级combobox改变时，二级和三级就需要清空   pipeCombxcombobox("clear");   pipeCombxcombobox('setValue', '全部'); //给combobox下拉框设置一个值，否则为空不好看   },   valueField: 'equipmentid',     textField: 'equipmentname',   value:'',   editable:false })combobox("clear"); //清空二级下拉框    },   valueField: 'equipmentid',     textField: 'equipmentname',   value:'',   editable:false }); /*******************************/ //下面的俩个是组件，  // 二层Combo var piperowCombx = $("#txtPipeRowName")combobox({ loader:function(param,success,error){   $ajax({ url: '${CTX_ROOT}/TEquipmentsController?method=getEquipmentByParId&id='+$("#txtShouName")combobox("getValue")+'', dataType: 'json', success: function(data){ dataunshift({equipmentid:'',equipmentname:'全部'}); success(data); },         error: function(){ errorapply(this, arguments); } });   },   valueField: 'equipmentid',     textField: 'equipmentname',   value:'',   editable:false });  //三层Combo var pipeCombx=$("#txtPipeName")combobox({ loader:function(param,success,error){   $ajax({ url: '${CTX_ROOT}/TEquipmentsController?method=getEquipmentByParId&id='+$("#txtPipeRowName")combobox("getValue")+'', dataType: 'json', success: function(data){ dataunshift({equipmentid:'',equipmentname:'全部'}); success(data); },         error: function(){ errorapply(this, arguments); } });   },   valueField: 'equipmentid',     textField: 'equipmentname',   value:'',   editable:false });