其它的都不說，使用easyui實現三級聯動主要就是一層套一層，大家且看代碼

html表單

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

easyUi的Combobox:

// 一層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 用戶點擊時觸發的事件 在此的意義在于，用戶點擊一級后自動二級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){ //這里也使用了onSelect事件，在二級combobox被用戶點擊時觸發三級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(){ //清空三級下拉框 就是成功加載完觸發的事件 當一級combobox改變時，二級和三級就需要清空   pipeCombxcombobox("clear");   pipeCombxcombobox('setValue', '全部'); //給combobox下拉框設置一個值，否則為空不好看   },   valueField: 'equipmentid',     textField: 'equipmentname',   value:'',   editable:false })combobox("clear"); //清空二級下拉框    },   valueField: 'equipmentid',     textField: 'equipmentname',   value:'',   editable:false }); /*******************************/ //下面的倆個是組件，  // 二層Combo var piperowCombx = $("#txtPipeRowName")combobox({ loader:function(param,success,error){   $ajax({ url: '${CTX_ROOT}/TEquipmentsController?method=getEquipmentByParId&id='+$("#txtShouName")combobox("getValue")+'', dataType: 'json', success: function(data){ dataunshift({equipmentid:'',equipmentname:'全部'}); success(data); },         error: function(){ errorapply(this, arguments); } });   },   valueField: 'equipmentid',     textField: 'equipmentname',   value:'',   editable:false });  //三層Combo var pipeCombx=$("#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 });