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 
});