[英]Cannot read property 'then' of undefined with JavaScript promises
[英]TypeScript/SPFx Promises throws Exception("Cannot read property 'then' of undefined") but seems to work
我嘗試創建一個 SPFx Webpart。 在創建新項目之前,我需要調用 0-4 次_ensureUser
,具體取決於是否設置了Client
、 AssignedTo
、 ResolvedBy
和Referrer
的任意組合。 完成所有必需的_ensureUser
調用后,即可創建新項目。
代碼在托管工作台上調試時運行,但在我調用userPromises[0].then( (value: {}) => {...
或Promise.all(userPromises).then( (value: {}[]) => {...
當我單擊 F5/continue 時,將執行其余部分並創建新項目_ensureUser
在我直接調用它並將其與 then's 鏈接時起作用,而不是先將其放入 userPromises 數組.
我認為問題是_ensureUser
沒有返回Promise
。 如果是這樣,我該怎么做? 我應該重組_ensureUser
和/或createItem
嗎? 我需要在某處調用 bind 嗎?
createItem
項目函數:
public createItem( logItem: IInteractionLogItem): Promise<IInteractionLogItem[]> {
const userPromises: Promise<{}>[] = [];
if(logItem.Client && logItem.Client.AccountName){
userPromises.push(this._ensureUser(logItem.Client));
}
if(logItem.AssignedTo && logItem.AssignedTo.AccountName){
userPromises.push(this._ensureUser(logItem.AssignedTo));
}
if(logItem.ResolvedBy && logItem.ResolvedBy.AccountName){
userPromises.push(this._ensureUser(logItem.ResolvedBy));
}
if(logItem.Referrer && logItem.Referrer.AccountName){
userPromises.push(this._ensureUser(logItem.Referrer));
}
console.log("SharePointDataProvider.CreateItem: userPromises.length=" + userPromises.length);
if( userPromises.length == 0) {
const batch: SPHttpClientBatch = this.webPartContext.spHttpClient.beginBatch();
const batchPromises: Promise<{}>[] = [
this._createItem(batch, logItem),
this._getItemsBatched(batch)
];
return this._resolveBatch(batch, batchPromises);
} else if( userPromises.length == 1) {
userPromises[0].then( (value: {}) => {
const batch: SPHttpClientBatch = this.webPartContext.spHttpClient.beginBatch();
const batchPromises: Promise<{}>[] = [
this._createItem(batch, logItem),
this._getItemsBatched(batch)
];
return this._resolveBatch(batch, batchPromises);
});
} else {
Promise.all(userPromises).then( (value: {}[]) => {
const batch: SPHttpClientBatch = this.webPartContext.spHttpClient.beginBatch();
const batchPromises: Promise<{}>[] = [
this._createItem(batch, logItem),
this._getItemsBatched(batch)
];
return this._resolveBatch(batch, batchPromises);
});
}
}
_ensureUser
函數:
private _ensureUser( user: IInteractionLogPerson): Promise<ISPUser> {
console.log("SharePointDataProvider.EnsureUser( \"" + user.AccountName + "\" )");
var data = {logonName: user.AccountName};
return this._webPartContext.spHttpClient.post(
this._ensureUserUrl,
SPHttpClient.configurations.v1,
{ body: JSON.stringify(data) } ).then(
(value: SPHttpClientResponse) => {
console.log("SharePointDataProvider.EnsureUser Got Http Response:\"" + value.statusText + "\"" );
return value.json();
},
(error: any) => console.log("SharePointDataProvider.EnsureUser Rejected: " + error )
).then((spUser: ISPUser) => {
console.log("SharePointDataProvider.EnsureUser Set Id:" + spUser.Id +" LoginName:\"" + spUser.LoginName + "\"" );
user.Id = spUser.Id;
return spUser;
});
}
1 _ensureUser
調用的調試輸出:
SharePointDataProvider.EnsureUser( "i:0#.f|membership|bob@pc.org.nz" )
SharePointDataProvider.CreateItem: userPromises.length=1
TypeError: Cannot read property 'then' of undefined
at ILoggerContainer._createInteractionLogItem (d:\spfx\iLogger-webpart\dist\i-logger.bundle.js:22103:60)
at ILoggerForm._handleAddButtonClick (d:\spfx\iLogger-webpart\dist\i-logger.bundle.js:23173:21)
at Object.r (https://spoprod-a.akamaihd.net/files/sp-client-prod_2017-06-30.017/sp-webpart-workbench-assembly_en-us_f3fed222daad2a0117a4c168deed7705.js:174:75541)
at a (https://spoprod-a.akamaihd.net/files/sp-client-prod_2017-06-30.017/sp-webpart-workbench-assembly_en-us_f3fed222daad2a0117a4c168deed7705.js:174:30260)
at Object.s [as executeDispatchesInOrder] (https://spoprod-a.akamaihd.net/files/sp-client-prod_2017-06-30.017/sp-webpart-workbench-assembly_en-us_f3fed222daad2a0117a4c168deed7705.js:174:30475)
at f (https://spoprod-a.akamaihd.net/files/sp-client-prod_2017-06-30.017/sp-webpart-workbench-assembly_en-us_f3fed222daad2a0117a4c168deed7705.js:174:26933)
at m (https://spoprod-a.akamaihd.net/files/sp-client-prod_2017-06-30.017/sp-webpart-workbench-assembly_en-us_f3fed222daad2a0117a4c168deed7705.js:174:27059)
at Array.forEach (<anonymous>)
at r (https://spoprod-a.akamaihd.net/files/sp-client-prod_2017-06-30.017/sp-webpart-workbench-assembly_en-us_f3fed222daad2a0117a4c168deed7705.js:174:112499)
at Object.processEventQueue (https://spoprod-a.akamaihd.net/files/sp-client-prod_2017-06-30.017/sp-webpart-workbench-assembly_en-us_f3fed222daad2a0117a4c168deed7705.js:174:28121)
SharePointDataProvider.EnsureUser Got Http Response:"OK"
SharePointDataProvider.EnsureUser Set Id:13 LoginName:"i:0#.f|membership|bob@pc.org.nz"
2 _ensureUser
調用的調試輸出:
SharePointDataProvider.EnsureUser( "i:0#.f|membership|dennis@carehouse.org.nz" )
SharePointDataProvider.EnsureUser( "i:0#.f|membership|bob@pc.org.nz" )
SharePointDataProvider.CreateItem: userPromises.length=2
TypeError: Cannot read property 'then' of undefined
at ILoggerContainer._createInteractionLogItem (d:\spfx\iLogger-webpart\dist\i-logger.bundle.js:22103:60)
at ILoggerForm._handleAddButtonClick (d:\spfx\iLogger-webpart\dist\i-logger.bundle.js:23173:21)
at Object.r (https://spoprod-a.akamaihd.net/files/sp-client-prod_2017-06-30.017/sp-webpart-workbench-assembly_en-us_f3fed222daad2a0117a4c168deed7705.js:174:75541)
at a (https://spoprod-a.akamaihd.net/files/sp-client-prod_2017-06-30.017/sp-webpart-workbench-assembly_en-us_f3fed222daad2a0117a4c168deed7705.js:174:30260)
at Object.s [as executeDispatchesInOrder] (https://spoprod-a.akamaihd.net/files/sp-client-prod_2017-06-30.017/sp-webpart-workbench-assembly_en-us_f3fed222daad2a0117a4c168deed7705.js:174:30475)
at f (https://spoprod-a.akamaihd.net/files/sp-client-prod_2017-06-30.017/sp-webpart-workbench-assembly_en-us_f3fed222daad2a0117a4c168deed7705.js:174:26933)
at m (https://spoprod-a.akamaihd.net/files/sp-client-prod_2017-06-30.017/sp-webpart-workbench-assembly_en-us_f3fed222daad2a0117a4c168deed7705.js:174:27059)
at Array.forEach (<anonymous>)
at r (https://spoprod-a.akamaihd.net/files/sp-client-prod_2017-06-30.017/sp-webpart-workbench-assembly_en-us_f3fed222daad2a0117a4c168deed7705.js:174:112499)
at Object.processEventQueue (https://spoprod-a.akamaihd.net/files/sp-client-prod_2017-06-30.017/sp-webpart-workbench-assembly_en-us_f3fed222daad2a0117a4c168deed7705.js:174:28121)
SharePointDataProvider.EnsureUser Got Http Response:"OK"
SharePointDataProvider.EnsureUser Set Id:10 LoginName:"i:0#.f|membership|dennis@carehouse.org.nz"
SharePointDataProvider.EnsureUser Got Http Response:"OK"
SharePointDataProvider.EnsureUser Set Id:13 LoginName:"i:0#.f|membership|bob@pc.org.nz"
我需要在調用userPromises[0].then( (value: {}) => {...
return
Promise.all(userPromises).then( (value: {}[]) => {...
. 代碼現在可以通過以下修改工作:
return userPromises[0].then( (value: {}) => {
和
return Promise.all(userPromises).then( (value: {}[]) => {
return ctx.spHttpClient.get(
url+'/_api/web/lists',
SPHttpClient.configurations.v1,
{
headers: [
['accept', 'application/json;odata.metadata=none']
]
}
).then((response: SPHttpClientResponse):Promise<ILists> => {
return response.json();
});
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