从 OData 响应将默认值绑定到 Combox
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【中文标题】从 OData 响应将默认值绑定到 Combox【英文标题】：Bind Default value to Combox from OData response 【发布时间】：2018-09-13 11:49:27 【问题描述】：我是 UI5 的新手，并试图对某人 3 年前编写的现有代码进行更改。我想在视图显示给用户之前向组合框添加默认值。我的问题是，视图被加载而没有显示默认值。您能否建议在用户更改选择之前如何显示默认值？我想从 Odata 响应中添加第一个 KOSTL 字段（如果有）。我尝试了类似下面的方法并将其放入下面的“dynamicData”函数中。但它不起作用。
在 Odata 中，使用 mCostCenter 模型通过提供登录用户作为输入来获取成本中心列表。如果结果不为空，我们需要在下拉列表中显示第一个 KOSTL 值。
var oData = this.getView().getModel("mCostCenter").getData();
sap.ui.getCore().byId("idDropdown1").setSelectedKey(OData.results[0].Kostl);
下拉：
![下拉][1]
查看代码：
var oDropdownBox1 = new sap.m.ComboBox(this.createId("idDropdown1"),
//items:[oItemTemplate1]
maxWidth: "100%",
placeholder: "Select Cost Center to continue",
selectionChange: jQuery.proxy(oController.onDropdownPress, this.getController()),
items:
path: "mCostCenter>/",
template: new sap.ui.core.ListItem(
key: "mCostCenter>Kostl",
text: "mCostCenter>Ltext"
)
).addStyleClass("idDropdown1");
控制器代码：
onInit: function()
var oUserData = ;
var y = "/sap/bc/ui2/start_up";
var xmlHttp = null;
xmlHttp = new XMLHttpRequest();
xmlHttp.onreadystatechange = function()
if (xmlHttp.readyState == 4 && xmlHttp.status == 200)
oUserData = JSON.parse(xmlHttp.responseText);
//console.log(oUserData);
;
xmlHttp.open("GET", y, false);
xmlHttp.send(null);
//oUserData.id = "nouser";
this.currUser = oUserData.id;
//new code for URL
this.sUrl = "https://ZZZ.ZZZ.com:8443/"; //default value
if (window.cordova && sap.Logon)
sap.Logon.core.getContext(jQuery.proxy(conSuccess, this), conError);
function conSuccess(objContext)
if (objContext.registrationContext)
var context = objContext.registrationContext;
if (context.https)
this.sUrl = "https://" + context.serverHost + ":" + context.serverPort + "/";
else
this.sUrl = "http://" + context.serverHost + ":" + context.serverPort + "/";
//call data now
if (oUserData.id == null)
sap.m.MessageToast.show("Error fetching user. Please contact Administrator.");
else
//sap.m.MessageToast.show("User is: "+oUserData.id);
this.dynamicData();
function conError(errorInfo)
//default value will be used
//call data now with default
if (oUserData.id == null)
sap.m.MessageToast.show("Error fetching user. Please contact Administrator.");
else
//sap.m.MessageToast.show("User is: "+oUserData.id);
this.dynamicData();
else
if (window.location && window.location.hostname != "localhost")
this.sUrl = "https://" + window.location.hostname + ":" + window.location.port + "/";
//call data now
if (oUserData.id == null)
sap.m.MessageToast.show("Error fetching user. Please contact Administrator.");
else
//sap.m.MessageToast.show("User is: "+oUserData.id);
this.dynamicData();
//new code URL end here
/*if(oUserData.id == null)
sap.m.MessageToast.show("Error fetching user. Please contact Administrator.");
else
//sap.m.MessageToast.show("User is: "+oUserData.id);
this.dynamicData();
*/
,
onDropdownPress: function(evt)
//alert("hi");
//alert(JSON.stringify(evt.getSource().getBindingContext()));
// debugger;
var selString = null;
//var selText = evt.getSource().getSelectedItem();
var selString1 = evt.getSource().getSelectedKey();
var oData = this.getView().getModel("mCostCenter").getData();
for (var i = 0; i < oData.length; i++)
if (oData[i].Kostl == selString1)
selString = parseFloat(oData[i].AvBubdget).toFixed(2) /*+ oData[i].Ltext*/ ;
break;
var dataJSModel = new sap.ui.model.json.JSONModel();
dataJSModel.setData(
"selD": selString,
"IDSel": selString1
);
this.getView().setModel(dataJSModel, "mCostSel");
var jsonData = this.getView().getModel("mfullReportees").getData();
var reportees =
value: []
;
for (var i = 0; i < jsonData.length; i++)
if (jsonData[i].Kostl == selString1)
if (reportees.value.length == 0)
//new Date(data.results[i]["SUBMISSION_DATE"].match(/\d+/)[0] * 1)
if (jsonData[i].Begda && jsonData[i].Endda)
var begdate = new Date(jsonData[i].Begda.match(/\d+/)[0] * 1);
var enddate = new Date(jsonData[i].Endda.match(/\d+/)[0] * 1);
var today = new Date();
if (today >= begdate && enddate >= today)
reportees.value.push(
"ImUser": jsonData[i].ImUser,
"Pernr": jsonData[i].Pernr,
"Endda": jsonData[i].Endda,
"Begda": jsonData[i].Begda,
"Kostl": jsonData[i].Kostl
);
else
reportees.value.push(
"ImUser": jsonData[i].ImUser,
"Pernr": jsonData[i].Pernr,
"Endda": jsonData[i].Endda,
"Begda": jsonData[i].Begda,
"Kostl": jsonData[i].Kostl
);
else
for (var k = 0; k < reportees.value.length; k++)
if (reportees.value[k]["Pernr"] == jsonData[i].Pernr)
break;
else if (k == (reportees.value.length - 1))
/*reportees.value.push(
"ImUser": jsonData[i].ImUser,
"Pernr": jsonData[i].Pernr,
"Endda": jsonData[i].Endda,
"Begda": jsonData[i].Begda,
"Kostl": jsonData[i].Kostl
);*/
if (jsonData[i].Begda && jsonData[i].Endda)
var begdate = new Date(jsonData[i].Begda.match(/\d+/)[0] * 1);
var enddate = new Date(jsonData[i].Endda.match(/\d+/)[0] * 1);
var today = new Date();
if (today >= begdate && enddate >= today)
reportees.value.push(
"ImUser": jsonData[i].ImUser,
"Pernr": jsonData[i].Pernr,
"Endda": jsonData[i].Endda,
"Begda": jsonData[i].Begda,
"Kostl": jsonData[i].Kostl
);
else
reportees.value.push(
"ImUser": jsonData[i].ImUser,
"Pernr": jsonData[i].Pernr,
"Endda": jsonData[i].Endda,
"Begda": jsonData[i].Begda,
"Kostl": jsonData[i].Kostl
);
var dataJSModel1 = new sap.ui.model.json.JSONModel();
dataJSModel1.setData(reportees);
this.getView().setModel(dataJSModel1, "mReportees");
var empData = this.getView().getModel("mfullResults").getData();
var employees =
value: []
;
var reporteeslen = dataJSModel1.oData.value.length;
for (var i = 0; i < empData.length; i++)
for (var j = 0; j < reporteeslen; j++)
if (empData[i].Pernr == dataJSModel1.oData.value[j].Pernr)
employees.value.push(empData[i]);
var dataJSModel2 = new sap.ui.model.json.JSONModel();
dataJSModel2.setData(employees);
this.getView().setModel(dataJSModel2, "mEmployees");
this.onSelectionChange();
,
getselectedfn: function(evt)
// debugger;
sap.ui.core.BusyIndicator.show(0);
var contexts = sap.ui.getCore().byId("idTable").getSelectedContexts();
var items = contexts.map(function(c)
return c.getObject();
);
//alert(JSON.stringify(items)); - only one item
var ApprovedBudget = parseFloat(this.getView().getModel("mCostSel").getData().selD);
var selectedCC = this.getView().getModel("mCostSel").getData().IDSel;
//alert(ApprovedBudget);
/*if(ApprovedBudget < parseFloat(items[0].Amount))
sap.m.MessageBox.alert("Selected amount is higher than budget",
title: "Not enough budget"
);
return;
*/
//var sUrl = "https://ZZZ.ZZZ.com:8443/sap/opu/odata/SAP/ZMOB_HCM_OVERTIME_SRV/";
var sUrl = this.sUrl + "sap/opu/odata/SAP/ZMOB_HCM_OVERTIME_SRV/";
var oHeaders = ;
oHeaders['Authorization'] = "Basic " + btoa("nouser:nopass");
oHeaders['X-CSRF-TOKEN'] = "FETCH";
oHeaders['Accept'] = "application/json";
var request =
headers: oHeaders,
requestUri: sUrl,
method: "GET"
;
OData.read(request, jQuery.proxy(readSuccessCallback, this), errorCallback);
function readSuccessCallback(data, response)
header_xcsrf_token = response.headers['x-csrf-token'];
//oHeaders['X-CSRF-TOKEN'] = header_xcsrf_token;
var oHeaders =
"X-CSRF-TOKEN": header_xcsrf_token, //most js frameworks use this to identify ajax request.
// "Content-Type" : "application/atom+xml",
// "Content-Type" : "multipart/mixed; boundary=batch",
// "Accept" : "application/atom+xml"
;
//var sUrl = "https://ZZZ.ZZZ.com:8443/sap/opu/odata/SAP/ZMOB_HCM_OVERTIME_SRV/ET_OT2_Action('"+this.currUser+"')";
var sUrl = this.sUrl + "sap/opu/odata/SAP/ZMOB_HCM_OVERTIME_SRV/";
//ET_OT2_Action('"+this.currUser+"')
var approvalChanges = [];
var oModel = new sap.ui.model.odata.ODataModel(sUrl, true, null, null, oHeaders);
//beginning for loop
// debugger;
for (var i = 0; i < items.length; i++)
var iworkdate = new Date(items[i].Workdate.match(/\d+/)[0] * 1);
var strWorkDate = iworkdate.toISOString();
strWorkDate = strWorkDate.substring(0, (strWorkDate.length - 2));
var iCreatedon = new Date(items[i].Createdon.match(/\d+/)[0] * 1);
var strCreatedon = iCreatedon.toISOString();
strCreatedon = strCreatedon.substring(0, (strCreatedon.length - 2));
var data2 =
"ImAction": "APPROVE",
"ImAvailableBudget": ApprovedBudget.toString(),
"ImReason": "",
"ImUser": items[i].ImUser,
"Pernr": items[i].Pernr,
"Workdate": strWorkDate,
"Awart": items[i].Awart,
"Counter": items[i].Counter,
"Catshours": items[i].Catshours,
"Meinh": items[i].Meinh,
"Status": items[i].Status,
"Createdby": items[i].Createdby,
"Createdon": strCreatedon,
"Createdat": items[i].Createdat,
"Name": items[i].Name,
"Atext": items[i].Atext,
"Grade": items[i].Grade,
"Shift": items[i].Shift,
"Versl": items[i].Versl,
"OtCompensation": items[i].OtCompensation,
"Amount": items[i].Amount,
"Waers": items[i].Waers,
"Gjahr": items[i].Gjahr,
"Period": items[i].Period,
"Kostl": selectedCC
;
var jsonrequest =
"d": data2
;
ApprovedBudget = ApprovedBudget - parseFloat(items[i].Amount);
//alert(JSON.stringify(items));
var sPathApproval = "ET_OT2_Action('" + this.currUser + "')";
//var sPathApproval = "ET_OT2_Action('abapdev4')";
jsonrequest["d"]["__metadata"] =
"uri": sUrl,
"type": "ZMOB_HCM_OVERTIME_SRV.ET_OT2_ACTION"
;
approvalChanges.push(oModel.createBatchOperation(sPathApproval, "PUT", jsonrequest));
oModel.addBatchChangeOperations(approvalChanges);
//end of for loop
// debugger;
oModel.submitBatch(jQuery.proxy(function(oData, oResponse, aErrorResponses)
// debugger;
var count = 0;
// if (typeof(oData.__batchResponses[0].__changeResponses[i]) === 'undefined' && typeof(oData.__batchResponses[0].response.statusCode)!=='undefined')
//
//
//
// var message = "Please contact Administrator";
//
//
// sap.m.MessageBox.alert(message,
//
// title: "Error occurred"
//
// );
//
//
//
if (aErrorResponses.length > 0)
var errMsg = JSON.parse(oData.__batchResponses[0].response.body).error.message.value;
sap.m.MessageBox.alert(errMsg,
title: "Error ocurred",
icon: sap.m.MessageBox.Icon.ERROR,
);
else
for (var i = 0; i < items.length; i++)
debugger;
if (typeof(oData.__batchResponses[0].__changeResponses) !== 'undefined' && oData.__batchResponses[0].__changeResponses[i].statusCode ===
"204")
count = count + 1;
sap.m.MessageBox.alert(count + " out of " + items.length + " records has been approved.",
title: "Overtime has been approved successfully",
icon: sap.m.MessageBox.Icon.SUCCESS,
);
// if(typeof(oData.__batchResponses[0].response.statusCode) !== 'undefined' && oData.__batchResponses[0].response.statusCode==="500")
//
//
this.dynamicData();
, this),
function(e)
// debugger;
//alert("Error occurred", err);
var message = "Please contact Administrator";
if (e.response && e.response.body)
// var obj = JSON.parse(e.response.body);
// if(obj.error && obj.error.message && obj.error.message.value)
message = e.response.body; //obj.error.message.value;
//
sap.ui.core.BusyIndicator.hide();
sap.m.MessageBox.alert(message,
title: "Error occurred",
icon: sap.m.MessageBox.Icon.ERROR
);
);
// var newrequest =
//
//
//
// headers : oHeaders,
//
// requestUri : sUrl,
//
// method : "PUT",
//
// data : jsonrequest
//
// ;
//
//
//
// OData.read(newrequest,jQuery.proxy(readSuccessCallbackPOST,this), errorCallbackPOST);
function errorCallback(e)
sap.ui.core.BusyIndicator.hide();
sap.m.MessageBox.alert("Server not reachable",
title: "Please try again later",
icon: sap.m.MessageBox.Icon.ERROR
);
function errorCallbackPOST(e)
//.indexOf("Remote function call module exception") != -1)
var message = "Please contact Administrator";
if (e.response && e.response.body)
var obj = JSON.parse(e.response.body);
if (obj.error && obj.error.message && obj.error.message.value)
message = obj.error.message.value;
sap.m.MessageBox.alert(message,
title: "Error occurred",
icon: sap.m.MessageBox.Icon.ERROR
);
function readSuccessCallbackPOST(data, response)
//var app = this.nav.getView().app;
sap.m.MessageBox.alert("Approved",
title: "Overtime has been approved successfully",
icon: sap.m.MessageBox.Icon.SUCCESS
);
this.dynamicData();
,
dynamicData: function()
//var sURL = "https://ZZZ.ZZZ.com:8443/sap/opu/odata/SAP/ZMOB_HCM_OVERTIME_SRV/ET_OT2_CostCenters?$filter=ImUser eq '"+this.currUser+"'";
sap.ui.getCore().byId("idApprove").setEnabled(false);
sap.ui.getCore().byId("idReject").setEnabled(false);
var sURL = this.sUrl + "sap/opu/odata/SAP/ZMOB_HCM_OVERTIME_SRV/ET_OT2_CostCenters?$filter=ImUser eq '" + this.currUser + "'";
var oHeaders = ;
oHeaders['Authorization'] = "Basic " + btoa("nouser:nopass");
oHeaders['contentType'] = 'application/json; charset=utf-8';
sap.ui.core.BusyIndicator.show(0);
var request =
headers: oHeaders,
requestUri: sURL,
method: "GET"
;
OData.read(request, jQuery.proxy(readSuccessCallback, this), errorCallback);
/*sURL = " https://ZZZ.ZZZ.com:8443/sap/opu/odata/SAP/ZMOB_HCM_OVERTIME_SRV/ET_ot_repSet?$filter=ImUser eq '"+this.currUser+"'";
request['requestUri'] = sURL;
OData.read(request, jQuery.proxy(readSuccessCallback1,this), errorCallback);
sURL = "https://ZZZ.ZZZ.com:8443/sap/opu/odata/SAP/ZMOB_HCM_OVERTIME_SRV/ET_ot_resultSet?$filter=ImUser eq '"+this.currUser+"'";
request['requestUri'] = sURL;
OData.read(request, jQuery.proxy(readSuccessCallback2,this), errorCallback);*/
function readSuccessCallback(data, response)
this.boolNoCostCenter = false;
this.boolNoReportees = false;
this.boolNoActivePeriod = false;
for (var i = 0; i < data.results.length; i++)
if (data.results[i].Kostl == "ERR_CC")
this.boolNoCostCenter = true;
data.results.splice(i, 1);
i = i - 1;
//sap.m.MessageBox.error("There are no cost centers assigned against your user.");
continue; //continue to remove other erros from the array
if (data.results[i].Kostl == "ERR_REP")
this.boolNoReportees = true;
data.results.splice(i, 1);
i = i - 1;
//sap.m.MessageBox.error("There are no cost centers assigned against your user.");
continue;
if (data.results[i].Kostl == "ERR_PAY")
this.boolNoActivePeriod = true;
data.results.splice(i, 1);
i = i - 1;
//sap.m.MessageBox.error("There are no cost centers assigned against your user.");
continue;
if (this.boolNoCostCenter)
sap.ui.core.BusyIndicator.hide();
sap.m.MessageBox.alert("There are no cost centers assigned against your user.",
icon: sap.m.MessageBox.Icon.WARNING
);
else if (this.boolNoReportees)
sap.ui.core.BusyIndicator.hide();
sap.m.MessageBox.alert("There are no reportees against your user.",
icon: sap.m.MessageBox.Icon.WARNING
);
else if (this.boolNoActivePeriod)
sap.ui.core.BusyIndicator.hide();
sap.m.MessageBox.alert("Payroll is in progress. Overtime Approval is closed for the month",
icon: sap.m.MessageBox.Icon.WARNING
);
else
//go ahead and read
//sURL = "https://ZZZ.ZZZ.com:8443/sap/opu/odata/SAP/ZMOB_HCM_OVERTIME_SRV/ET_OT2_Reportees?$filter=ImUser eq '"+this.currUser+"'";
sURL = this.sUrl + "sap/opu/odata/SAP/ZMOB_HCM_OVERTIME_SRV/ET_OT2_Reportees?$filter=ImUser eq '" + this.currUser + "'";
request['requestUri'] = sURL;
OData.read(request, jQuery.proxy(readSuccessCallback1, this), errorCallback);
//sURL = "https://ZZZ.ZZZ.com:8443/sap/opu/odata/SAP/ZMOB_HCM_OVERTIME_SRV/ET_OT2_OvertimeRecords?$filter=ImUser eq '"+this.currUser+"'";
sURL = this.sUrl + "sap/opu/odata/SAP/ZMOB_HCM_OVERTIME_SRV/ET_OT2_OvertimeRecords?$filter=ImUser eq '" + this.currUser + "'";
request['requestUri'] = sURL;
OData.read(request, jQuery.proxy(readSuccessCallback2, this), errorCallback);
//console.log("json result " + JSON.stringify(data.results));
var dataJSModel = new sap.ui.model.json.JSONModel();
dataJSModel.setData(data.results);
this.getView().setModel(dataJSModel, "mCostCenter");
//sap.ui.core.BusyIndicator.hide();
function readSuccessCallback1(data, response)
var dataJSModel1 = new sap.ui.model.json.JSONModel();
dataJSModel1.setData(data.results);
this.getView().setModel(dataJSModel1, "mfullReportees");
//sap.ui.core.BusyIndicator.hide();
function readSuccessCallback2(data, response)
var dataJSModel1 = new sap.ui.model.json.JSONModel();
dataJSModel1.setData(data.results);
this.getView().setModel(dataJSModel1, "mfullResults");
var selString1 = this.getView().byId("idDropdown1").getSelectedKey();
if (selString1 != "" && selString1 != null)
var oData = this.getView().getModel("mCostCenter").getData();
for (var i = 0; i < oData.length; i++)
if (oData[i].Kostl == selString1)
selString = parseFloat(oData[i].AvBubdget).toFixed(2) /*+ oData[i].Ltext*/ ;
break;
var dataJSModel = new sap.ui.model.json.JSONModel();
dataJSModel.setData(
"selD": selString,
"IDSel": selString1
);
this.getView().setModel(dataJSModel, "mCostSel");
var jsonData = this.getView().getModel("mfullReportees").getData();
var reportees =
value: []
;
for (var i = 0; i < jsonData.length; i++)
if (jsonData[i].Kostl == selString1)
if (reportees.value.length == 0)
/*reportees.value.push(
"ImUser": jsonData[i].ImUser,
"Pernr": jsonData[i].Pernr,
"Endda": jsonData[i].Endda,
"Begda": jsonData[i].Begda,
"Kostl": jsonData[i].Kostl
);*/
if (jsonData[i].Begda && jsonData[i].Endda)
var begdate = new Date(jsonData[i].Begda.match(/\d+/)[0] * 1);
var enddate = new Date(jsonData[i].Endda.match(/\d+/)[0] * 1);
var today = new Date();
if (today >= begdate && enddate >= today)
reportees.value.push(
"ImUser": jsonData[i].ImUser,
"Pernr": jsonData[i].Pernr,
"Endda": jsonData[i].Endda,
"Begda": jsonData[i].Begda,
"Kostl": jsonData[i].Kostl
);
else
reportees.value.push(
"ImUser": jsonData[i].ImUser,
"Pernr": jsonData[i].Pernr,
"Endda": jsonData[i].Endda,
"Begda": jsonData[i].Begda,
"Kostl": jsonData[i].Kostl
);
else
for (var k = 0; k < reportees.value.length; k++)
if (reportees.value[k]["Pernr"] == jsonData[i].Pernr)
break;
else if (k == (reportees.value.length - 1))
/*reportees.value.push(
"ImUser": jsonData[i].ImUser,
"Pernr": jsonData[i].Pernr,
"Endda": jsonData[i].Endda,
"Begda": jsonData[i].Begda,
"Kostl": jsonData[i].Kostl
);*/
if (jsonData[i].Begda && jsonData[i].Endda)
var begdate = new Date(jsonData[i].Begda.match(/\d+/)[0] * 1);
var enddate = new Date(jsonData[i].Endda.match(/\d+/)[0] * 1);
var today = new Date();
if (today >= begdate && enddate >= today)
reportees.value.push(
"ImUser": jsonData[i].ImUser,
"Pernr": jsonData[i].Pernr,
"Endda": jsonData[i].Endda,
"Begda": jsonData[i].Begda,
"Kostl": jsonData[i].Kostl
);
else
reportees.value.push(
"ImUser": jsonData[i].ImUser,
"Pernr": jsonData[i].Pernr,
"Endda": jsonData[i].Endda,
"Begda": jsonData[i].Begda,
"Kostl": jsonData[i].Kostl
);
/*for(var i=0; i<jsonData.length; i++)
if(jsonData[i].Kostl == selString1)
reportees.value.push(
"ImUser": jsonData[i].ImUser,
"Pernr": jsonData[i].Pernr,
"Endda": jsonData[i].Endda,
"Begda": jsonData[i].Begda,
"Kostl": jsonData[i].Kostl
);
;*/
var dataJSModel1 = new sap.ui.model.json.JSONModel();
dataJSModel1.setData(reportees);
this.getView().setModel(dataJSModel1, "mReportees");
var empData = this.getView().getModel("mfullResults").getData();
var employees =
value: []
;
var reporteeslen = dataJSModel1.oData.value.length;
for (var i = 0; i < empData.length; i++)
for (var j = 0; j < reporteeslen; j++)
if (empData[i].Pernr == dataJSModel1.oData.value[j].Pernr)
employees.value.push(empData[i]);
var dataJSModel2 = new sap.ui.model.json.JSONModel();
dataJSModel2.setData(employees);
this.getView().setModel(dataJSModel2, "mEmployees");
sap.ui.core.BusyIndicator.hide();
function errorCallback(e)
sap.ui.core.BusyIndicator.hide();
//alert("An error occurred ");
if (e.response.statusCode == "400" && e.response.body.indexOf("Remote function call module exception") != -1)
sap.m.MessageToast.show("You have no Cost Center or Reportees assigned. Kindly check");
else if (e.response.statusCode == "403" || e.response.statusCode == "0")
sap.m.MessageToast.show("Server not reachable. Please try again later");
else if(e.response && e.response.body)
var message = "Please contact Administrator";
var obj = JSON.parse(e.response.body);
if (obj.error && obj.error.message && obj.error.message.value)
message = obj.error.message.value;
sap.m.MessageToast.show(message);
else
sap.m.MessageToast.show("An error occurred. Please contact administrator");
console.log("An error occurred " + JSON.stringify(e));
【问题讨论】：
【参考方案1】：在我看来，一旦你有了数据，你应该做类似的事情：
var defaultItem = this.getView().byId("idDropdown1").getItems()[0];
this.getView().byId("idDropdown1").setSelectedItem(defaultItem, true);
这将获取模型中的第一个元素，然后将其设置为 ComboBox 中的选定元素。
在本例中，它将 ComboBox 的第一个设置为选定项。
【讨论】：
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