我正在尝试检查当前用户是否是正在编辑的记录的所有者,如果是,我将允许编辑,否则,我将阻止编辑。我有两个函数分别让我成为当前用户和创建记录的用户。由于存在不同的依赖性,因此将它们分别称为。如何将它们组合成一个功能。 根据下面的注释和一些调试,我将代码重构为使用promise.all。现在,它可以正常运行,并且是如何编码的示例。
我的代码如下:
<!-- Download SPServices from: //spservices.codeplex.com/ -->
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery.SPServices/2014.02/jquery.SPServices-2014.02.min.js"></script>
<script type="text/javascript">
$(document).ready(function() {
//don't exectute any jsom until sp.js file has loaded.
SP.SOD.executeFunc('sp.js', 'SP.ClientContext', StartProcess);
});
function StartProcess() {
var selectedValue = $("h3:contains('Request Phase')").closest('tr').find('select').val();
if (selectedValue == 'New') {
const DataFetch = Promise.all([
makeFirstCall().catch(error => {
return "error";
}),
makeSecondCall().catch(error => {
return "error";
})
]).then(resolvedData => {
// do something with resolved data
console.log('resolvedData='+resolvedData);
}).catch(error => {
console.error(error)
})
console.log('Succces');
}
}
const makeFirstCall = () => {
return new Promise(function(resolve, reject) {
//console.log('makeFirstCall');
// make your call
getCurrentUser().then(
function (currentUser) {
var loginId = currentUser.get_id();
//console.log('Current user ID='+loginId);
resolve(loginId);
}
);
});
}
const makeSecondCall = () => {
return new Promise(function(resolve, reject) {
console.log('makeSecondCall ');
// make your call
retrieveListItems().then(
function (requestUser) {
//var loginId = requestUser.get_id();
console.log('requestUser user ID='+requestUser);
resolve(requestUser);
}
);
});
}
function getCurrentUser()
{
//Declare your deferred object here
//console.log('getCurrentUser');
var deferred=$.Deferred();
var ctx = new SP.ClientContext.get_current();
this.website = ctx.get_web();
this.currentUser = website.get_currentUser();
ctx.load(currentUser);
ctx.executeQueryAsync(Function.createDelegate(this,
function () { deferred.resolve(currentUser); }),
Function.createDelegate(this,
function (sender, args) { deferred.reject(sender, args); })
);
//console.log('END-getCurrentUser');
//Return your Promise Object
return deferred.promise();
}
function retrieveListItems()
{
//Declare your deferred object here
console.log('retrieveListItems');
var deferred=$.Deferred();
var ctx = new SP.ClientContext.get_current();
// Get ID of the current item.
var currentItemID = window.location.href.toLowerCase();
currentItemID = currentItemID.substring(currentItemID.toLowerCase().indexOf("?id=") + 4,
currentItemID.toLowerCase().indexOf("&source="));
console.log('currentItemID='+currentItemID);
var oList = clientContext.get_web().get_lists().getByTitle('BSMRequests');
var camlQuery = new SP.CamlQuery();
camlQuery.set_viewXml('<View><Query><Where><Eq><FieldRef Name=\'ID\'/><Value Type=\'Text\'>'+ currentItemID+
'</Value></Eq></Where></Query></View>');
collListItem = oList.getItems(camlQuery);
ctx.load(collListItem);
//var loginId = "66";
//deferred.resolve(loginId);
ctx.executeQueryAsync(Function.createDelegate(this,function () {
var listItemEnumerator = collListItem.getEnumerator();
while (listItemEnumerator.moveNext()) {
var oListItem = listItemEnumerator.get_current();
console.log('Record id='+oListItem.get_item('ID'));
requestorID = oListItem.get_item('Requestor_x0020_Name').get_lookupId();
console.log('requestorID='+requestorID );
}
deferred.resolve(requestorID);
}),
Function.createDelegate(this,function (sender, args) { deferred.reject(sender, args); })
);
console.log('END-retrieveListItems');
//Return your Promise Object
return deferred.promise();
}
</script>
我的代码将返回两个id,然后一个可以使用它们完成它们想要的操作。这些ID位于数组中,因此比较它们可以解决问题。
console.log('Userid: '+resolvedData[0]+'=? Userid: '+resolvedData[1]);
答案 0 :(得分:1)
您好,您可以将两个调用都变成promises并使用promise.all来获得响应。这样,您就可以等待两个结果。
const DataFetch = Promise.all([
makeFirstCall().catch(error => {
return "error";
}),
makeSecondCall().catch(error => {
return "error";
})
]).then(resolvedData => {
// do something with resolved data
}).catch(error => {
console.error(error)
})
要实现promise功能,您可以执行以下操作:
const makeFirstCall = () => {
return new Promise(function(resolve, reject) {
// make your call
reject(new Error(`error message`)); // if error
resolve(dataFromCall);
});
}