im在尝试通过http.post/get请求Argument of type '{header:Header;}' is not assignable to parameter of type 'RequestOptionsArgs'. Property 'null' is missing in the type '{header:Header;}'
我尝试了许多解决方案，但没有锁定。
在这里我的代码：
import { Injectable } from '@angular/core';
import { Response, RequestOptions, Headers, Http, URLSearchParams} from '@angular/http';
import { Observable, Subject } from 'rxjs/Rx';
import {Company} from './companyMaster';
import 'rxjs/add/operator/map';
import "rxjs/Rx";
import 'rxjs/add/operator/toPromise';
import {CommonService} from '../../common.service';
@Injectable()
export class CompanyMasterService {
private GetListActionUrl: string;
private AddEditActionUrl: string;
public headers = new Headers({ 'Content-Type': 'application/json' });
public options = new RequestOptions({ headers: this.headers });
commonService: CommonService;
constructor(private _http: Http) {
this.commonService = new CommonService();
this.GetListActionUrl = this.commonService.RootURL + 'Company/GetList';
this.AddEditActionUrl = this.commonService.RootURL + "Company/AddEdit";
}
private RegenerateData = new Subject<number>();
// Observable string streams
RegenerateData$ = this.RegenerateData.asObservable();
GetList(): Promise<Company[]> {
return this._http.get(this.GetListActionUrl + "?branchId=" + this.commonService.BranchId)
.toPromise()
.then(response => this.extractArray(response))
.catch();
}
AddEdit(company: Company): any {
let headers = new Headers({ 'content-type': 'application/json' });
let body = JSON.stringify({
'BRANCH_ID': company.BRANCH_ID.toString(),
'COMPANY_ID': company.COMPANY_ID != null ? company.COMPANY_ID.toString() : null, 'COMPANY_NAME': company.COMPANY_NAME
});
let options = new RequestOptions({ headers: headers});
return this._http.post(this.AddEditActionUrl, body, options)
.toPromise()
.then(response => this.extractArray(response))
.catch();
}
protected extractArray(res: Response, showprogress: boolean = true) {
let data = res.json();
return data || [];
}
private getHeaders() {
// I included these headers because otherwise FireFox
// will request text/html instead of application/json
let headers = new Headers();
headers.append('Accept', 'application/json');
return headers;
}
}
请参见上面的代码，我已通过methot addit((中的标题((，但它显示了上述错误，我尝试了许多解决方案，例如：
- 更新软件包
- 导入 @angular/http
- 尝试了不同的通过标题的方式尝试了此解决方案
我已连接屏幕快照，显示了Visual Studio IDE中的错误。请参阅附件错误屏幕截图请尽快回复。
package.json
{
"name": "sb-admin-angular4-bootstrap4",
"version": "1.0.0",
"license": "MIT",
"scripts": {
"ng": "ng",
"start": "ng serve --ec=true",
"build": "ng build --prod",
"gitbuild": "ng build --prod --base='/start-angular/SB-Admin-BS4-Angular-4/master/dist/'",
"test": "ng test",
"lint": "ng lint",
"e2e": "ng e2e"
},
"private": true,
"dependencies": {
"@angular/common": "^4.0.0",
"@angular/compiler": "^4.0.0",
"@angular/core": "^4.0.0",
"@angular/forms": "^4.0.0",
"@angular/http": "^4.0.0",
"@angular/platform-browser": "^4.0.0",
"@angular/platform-browser-dynamic": "^4.0.0",
"@angular/router": "^4.0.0",
"@ng-bootstrap/ng-bootstrap": "^1.0.0-alpha.25",
"@ngx-translate/core": "^6.0.1",
"@ngx-translate/http-loader": "0.0.3",
"core-js": "^2.4.1",
"font-awesome": "^4.7.0",
"ionicons": "^3.0.0",
"ng2-charts": "^1.5.0",
"rxjs": "^5.1.0",
"typing": "^0.1.9",
"zone.js": "^0.8.4"
},
"devDependencies": {
"@angular/cli": "^1.1.3",
"@angular/compiler-cli": "^4.0.0",
"@types/jasmine": "2.5.38",
"@types/node": "~6.0.60",
"codelyzer": "~2.0.0",
"jasmine-core": "~2.5.2",
"jasmine-spec-reporter": "~3.2.0",
"karma": "~1.4.1",
"karma-chrome-launcher": "~2.0.0",
"karma-cli": "~1.0.1",
"karma-coverage-istanbul-reporter": "^0.2.0",
"karma-jasmine": "~1.1.0",
"karma-jasmine-html-reporter": "^0.2.2",
"karma-phantomjs-launcher": "^1.0.4",
"protractor": "~5.1.0",
"ts-node": "~2.0.0",
"tslint": "~4.5.0",
"typescript": "~2.2.0",
"webpack": "^3.0.0"
}
}
我终于通过跳过requestOptions对象解决了我的问题。
我正在使用Angular 4，所以对我来说可能有所不同，但是我创建了一个未型的对象并将其传递到HTTP方法函数... -
import { Identifiable, RestRepositoryService, HalResponse } from '../spring-data/rest-repository.service';
import { Injectable } from '@angular/core';
import { HttpClient, HttpHeaders } from '@angular/common/http';
import { ContentTemplate } from '../content-template/content-template.service';
export class ContentItem extends HalResponse {
id: string;
name: string;
description?: string;
fieldValues: any;
template: any;
contentType: any;
}
@Injectable()
export class ContentItemService extends RestRepositoryService<ContentItem> {
getContentType(contentItem: ContentItem) {
return this.http.get(contentItem._links.contentType.href);
}
getContentTemplate(contentItem: ContentItem) {
return this.http.get(contentItem._links.template.href);
}
setContentTemplate(contentItem: ContentItem, template: ContentTemplate) {
const headers = new HttpHeaders({'Content-Type': 'text/uri-list'});
return this.http.put(contentItem._links.template.href, template._links.self.href, {headers: headers});
}
constructor(http: HttpClient) {
super(http, '/api/contentItems');
}
}
尝试此方法。这有帮助
options = new RequestOptions();
options.headers = new Headers();
options.headers.append('Content-Type', 'application/json');
options.headers.append('X-Requested-With', 'XMLHttpRequest');
您遇到的问题是：
private getHeaders() {
// I included these headers because otherwise FireFox
// will request text/html instead of application/json
let headers = new Headers();
headers.append('Accept', 'application/json');
return headers;
}
Httpheaders的实现append()是：
append(name: string, value: string|string[]): HttpHeaders {
return this.clone({name, value, op: 'a'});
}
它返回您的httpheaders对象的克隆。为了使您的附加影响，您需要将其存储在一个变量中，即：
headers = headers.append('Accept', 'application/json');