Question

我需要填充以下类型的文档对象。我正在使用Angular 7打字稿。我遇到错误，类型'void []'无法分配给类型'IDocumentDetails []

export interface IDocumentUpload {
    fileDropEntry: NgxFileDropEntry;
    name: string;
    selectedDocumentItem: { 'Id': number; 'Name': string; }
    selectedDate: Date;

}

    export interface IDocumentDetails {
        name: string;
        file: any;
        documentTypeId: number;
        documentDate: Date;
    }


    export interface IDocuments {
        managerStrategyId: number;
        documentDetails: IDocumentDetails[];
    }

    documents: IDocuments;
    public files: IDocumentUpload[] = [];

这行代码出现错误

const documents: IDocumentDetails[] = this.files.map(doc =>

代码

const documents: IDocumentDetails[] = this.files.map(doc => {
                return  

                     [{ 
                        file: doc.fileDropEntry.fileEntry,
                        documentTypeId: doc.selectedDocumentItem.Id,
                        name: doc.name,
                        documentDate: doc.selectedDate
                    }];

            });

            this.documents = {managerStrategyId : 0, documentDetails: null};
            this.documents.managerStrategyId =  this.ManagerStrategyId;
            this.documents.documentDetails = documents;

Answer 1

更新了答案，只是尝试是否有效？

const documents: IDocumentDetails[] = this.files.map((doc) => {
                return { 
                        file: doc.fileDropEntry.fileEntry,
                        documentTypeId: doc.selectedDocumentItem.Id,
                        name: doc.name,
                        documentDate: doc.selectedDate
                    };

            });

            this.documents = {managerStrategyId : 0, documentDetails: null};
            this.documents.managerStrategyId =  this.ManagerStrategyId;
            this.documents.documentDetails = documents;

Answer 2

由于您的return语句后没有方括号'（'，因此您什么也不返回。尝试将大括号与“返回”字词放在同一行。

Alos，就像@JSON Derolu所说的那样，您的.map函数需要返回一个对象，而不是数组，因此请删除方括号。

尝试此代码：

const documents: IDocumentDetails[] = this.files.map(doc => {
  return { // notice just a curly bracket, and in the same line with 'return'
    file: doc.fileDropEntry.fileEntry,
    documentTypeId: doc.selectedDocumentItem.Id,
    name: doc.name,
    documentDate: doc.selectedDate
  };
});

Answer 3

您的const documents类型为IDocumentDetails[]，因此您需要在地图函数中返回类型为IDocumentDetails的对象。

尝试一下。

const documents: IDocumentDetails[] = this.files.map((doc: IDocumentUpload): IDocumentDetails => {
  return {
    file: doc.fileDropEntry.fileEntry,
    documentTypeId: doc.selectedDocumentItem.Id,
    name: doc.name,
    documentDate: doc.selectedDate
  };
});

通过指定数据类型，我使您的代码具有更强的类型。这里map函数中的doc参数的类型为IDocumentUpload，函数的返回类型为IDocumentDetails，即您在map函数中返回的对象。

Answer 4

尝试这样发送您的回复：

const documents: IDocumentDetails[] = this.files.map(doc => {
            return 
                 [{ 
                    file: doc.fileDropEntry.fileEntry,
                    documentTypeId: doc.selectedDocumentItem.Id,
                    name: doc.name,
                    documentDate: doc.selectedDate
                }] as IDocumentDetails[];
        });

Answer 5

检查其是否正常工作

替换此：

const documents: IDocumentDetails[] = this.files.map(doc => {
            return  

                 [{ 
                    file: doc.fileDropEntry.fileEntry,
                    documentTypeId: doc.selectedDocumentItem.Id,
                    name: doc.name,
                    documentDate: doc.selectedDate
                }];

        });

        this.documents = {managerStrategyId : 0, documentDetails: null};
        this.documents.managerStrategyId =  this.ManagerStrategyId;
        this.documents.documentDetails = documents;

与此：

 const documents: IDocumentDetails[]=[]
this.documents = this.files.map(doc => {
                return  

                     [{ 
                        file: doc.fileDropEntry.fileEntry,
                        documentTypeId: doc.selectedDocumentItem.Id,
                        name: doc.name,
                        documentDate: doc.selectedDate
                    }];

            });

            this.documents = {managerStrategyId : 0, documentDetails: null};
            this.documents.managerStrategyId =  this.ManagerStrategyId;
            this.documents.documentDetails = documents;

角度7：类型'void []'不可分配给类型

5 个答案: