我有以下SharePoint 2016 JSOM查询，该查询根据当前用户电子邮件检索列表项...此查询当前有效，但是，我一直在使用jquery defferred和Promised对象进行一些研究。为了理解这些方法的工作原理，我想优化下面的现有代码
<script type="text/javascript" src="//code.jquery.com/jquery-3.2.1.min.js"></script>
<script type="text/javascript">
$(document).ready(function () {
getCurrent();
//getMyTasks();
$('#checkall').click(function (e) {
$("#GetItems").find('td input:input[name=chk]').prop('checked', this.checked);
if($(this).is(':checked')) {
$('#Reject').removeAttr('disabled');
$('#Approve').removeAttr('disabled');
} else {
$('#Reject').attr('disabled', true);
$('#Approve').attr('disabled', true);
}
});
$('#GetItems').on('change', 'input[name=chk]', function(){
if($(this).is(':checked')) {
$('#Reject').removeAttr('disabled');
$('#Approve').removeAttr('disabled');
} else {
$('#Reject').attr('disabled', true);
$('#Approve').attr('disabled', true);
}
});
SP.SOD.executeFunc('sp.js', 'SP.ClientContext', approve);
SP.SOD.executeFunc('sp.js', 'SP.ClientContext', reject);
// approve();
//reject();
});
function getCurrent()
{
$.ajax({
url: _spPageContextInfo.webAbsoluteUrl + "/_api/SP.UserProfiles.PeopleManager/GetMyProperties?$select=Email",
headers: { Accept: "application/json;odata=verbose" },
success: function (data) {
currentEmail=data.d.Email;
getMyTasks();
} ,
error: function (data) {
alert("failed to get email");
}
});
}
function getMyTasks(){
//var listTitle="hardware%20requisition";
var row = "";
var buttonrow="";
var url =_spPageContextInfo.webAbsoluteUrl + "/_api/web/lists/getbytitle('EUS Asset Request')/Items?$select=ID,AssetMgrEmail,EUSPersonMailID,SRNo,AssetAvailability,Asset_x0020_Manager_x0020_Approv,Asset_x0020_Manager_x0020_Commen,Attachments,Department,Department_x0020_Head,Department_x0020_head_x0020_Appr,Department_x0020_head_x0020_appr1,Department_x0020_head_x0020_Appr0,HOD_x0020_Approval_x0020_Comment,IT_x0020_Head,IT_x0020_Head_x0020_Approval_x001,IT_x0020_head_x0020_Approval_x00,Items_x0020_Requested_x0020_For,IT_x0020_head_x0020_approval_x000,IT_x0020_head_x0020_Approved_x00,Job_x0020_Title,L1_x0020_Approval_x0020_Comments,L1_x0020_Approval_x0020_Date,L1_x0020_Approval_x0020_Status,L1_x0020_Approved_x0020_Date,L1_x0020_Supervisor_x0020_Email,Motivation,OPCO,Replacement_x0020_Type,Request_x0020_Summary,Request_x0020_Type,Requester_x0020_Name,EUSPersonMailID,Requester_x0020_Phone_x0020_Numb,ViewID,Author/Name,Author/EMail,Author/Title&$expand=Author/Id&$filter=EUSPersonMailID eq '"+currentEmail+"' and L1_x0020_Approval_x0020_Status eq 'Approved' and Department_x0020_head_x0020_appr1 eq 'Approved' and IT_x0020_head_x0020_approval_x000 eq 'Approved' and Asset_x0020_Manager_x0020_Approv eq 'Approved' and EUSTeamConfirmation eq 'Pending'"
$.ajax({
url: url,
type: "GET",
headers:
{
"Accept": "application/json;odata=verbose",
"Content-Type": "application/json;odata=verbose",
},
success: function(data){
var result = data.d.results;
if(result.length>0)
{
$("#divbuttons").show();
$.each(result, function(key, item)
{
var createdDate= moment(item.Created_x0020_Date).format("DD/MM/YYYY");
row = row + '<tr style="background-color: #cccccc;"><td style="width: 261.6px;"><strong>Select</strong> <input name="chk" type="checkbox" value='+ item.Id+' /></td><td style="width: 151.2px;"> </td><td style="width: 324.8px;"><strong>Request ID: </strong>'+item.ID+'</td><td style="width: 324.8px;"><strong>Requester Name: </strong>'+item.Author.Title+'</td><td style="width: 376.8px;"><strong>Phone Number:</strong><br />'+item.Requester_x0020_Phone_x0020_Numb+'</td><td style="width: 396px;"><strong>Department:</strong><br />'+item.Department+'</td><td style="width: 213px;"><strong>Request Type</strong><br />:'+item.Request_x0020_Type+'</td><td style="width: 4.8px;">Availability Status<br/>:'+item.AssetAvailability+'</td><td style="width: 213px;"><strong>Serial Number</strong><br />'+item.SRNo+'</td><td style="width: 213px;"><strong>EUS Person MailID</strong><br />'+item.EUSPersonMailID+'</td><td style="width: 213px;"><strong>Receiver MailID</strong><br />'+item.Author.EMail+'</td></tr>';
})
$("#GetItems>tbody").html(row);
$("#GetItems").show();
}
else{
$("#NoTask").show();
}
},
error: function(data){
alert("Failed to get list items.");
}
});
}
function approve(){
$("#Approve").click(function(event){
event.preventDefault();
var searchIDs = $("#GetItems input:checkbox:checked").map(function(){
return $(this).val();
}).get();
var itemArray = [];
var clientContext = new SP.ClientContext(_spPageContextInfo.webAbsoluteUrl);
var oList = clientContext.get_web().get_lists().getByTitle("EUS Asset Request");
for(var i = 0; i< searchIDs.length; i++){
// alert($("#GetItems textarea#"+searchIDs[i]+"").val());
var oListItem = oList.getItemById(searchIDs[i]);
oListItem.set_item('EUSTeamConfirmation', 'Confirmed');
oListItem.set_item('ViewID', 'FinalVw');
oListItem.update();
itemArray[i] = oListItem;
clientContext.load(itemArray[i]);
}
clientContext.executeQueryAsync(onQuerySucceeded, onQueryFailed);
function onQuerySucceeded() {
alert('Items Updated');
location.reload(true);
}
function onQueryFailed(sender, args) {
alert('Request failed. ' + args.get_message() + '\n' + args.get_stackTrace());
location.reload(true);
}
});
}
function reject(){
$("#Reject").click(function(event){
event.preventDefault();
var searchIDs = $("#GetItems input:checkbox:checked").map(function(){
return $(this).val();
}).get();
var itemArray = [];
var clientContext = new SP.ClientContext(_spPageContextInfo.webAbsoluteUrl);
var oList = clientContext.get_web().get_lists().getByTitle("EUS Asset Request");
for(var i = 0; i< searchIDs.length; i++){
var oListItem = oList.getItemById(searchIDs[i]);
oListItem.set_item('EUSTeamConfirmation', 'Rejected');
oListItem.set_item('ViewID', 'RejectVw');
oListItem.update();
itemArray[i] = oListItem;
clientContext.load(itemArray[i]);
}
clientContext.executeQueryAsync(onQuerySucceeded, onQueryFailed);
function onQuerySucceeded() {
alert('Task Rejected');
location.reload(true);
//getCurrent();
}
function onQueryFailed(sender, args) {
alert('Request failed. ' + args.get_message() + '\n' + args.get_stackTrace());
location.reload(true);
// getCurrent();
}
});
}
</script>
<div id="NoTask" style="display:none">You don't have pending tasks for approval</div>
<div style="display:none" id="divbuttons"><input type="checkbox" id="checkall"></input><button type="button" id="Reject" disabled>Reject</button><button type="button" id="Approve" disabled>Approve</button></div>
<table id="GetItems" cellspacing="12"><tbody></tbody> </table>
请帮助