小编Pen*_*gyy的帖子

我是Angular 4的新手,所以我正在用Angular 4创建一个firebase聊天应用程序,然后当我导入一些这样的模块时:

import { AngularFire, AuthProviders, AuthMethods,FirebaseListObservable } from 'angularfire2';

我说每个模块都有错误

没有导出的成员AngularFire,AuthProviders,AUthMethods,FirebaseListObservable.

谢谢

出现以下错误: 类型'Promise'不能分配给'string []'."承诺"类型中缺少属性"包含".

当我施放Promise键入'string []'我的代码如下,

组件:app.dashboard.ts

import {Component} from '@angular/core';
import { MemberService } from "./app.service";
@Component({
selector:'app-root',
templateUrl:'./app.dashboard.html',
providers:[MemberService]
          })

export class AppDashboard{
  title='Dashboard'
  constructor(private memberService: MemberService) { }

  public doughnutChartLabels:string[] = 
    this.memberService.getmemberheader();//error occurred here
  }
}

服务:app.service.ts

import { Injectable } from '@angular/core';
import { Member } from './Member';
import { Http, Response, Headers, RequestOptions, URLSearchParams } from'@angular/http';
import 'rxjs/add/operator/map';
import 'rxjs/add/operator/toPromise';

@Injectable()
export class MemberService
{
  constructor(private http: Http) {
  }

  private getHeaders(){
    // I included these …

我想将自己的自定义CSS添加到我的新Angular CLI应用程序中......

然而,我正在努力让这个工作,并没有太多关于它是如何工作的文档,这使得它有点猜测工作!

在下图中,我将自定义样式表添加到.angular-cli.json文件中,如下所示:

  "styles": [
    "styles.css",
    "app/assets/css/styles.css"
  ],

然而,这不起作用......

好心提醒!

我是打字稿的新手,我得到了这个错误

类型'Observable'不能分配给'IProduct []'.'Observable'类型中缺少属性'includes'.

我的服务类是:

getProducts() : Observable<IProduct[]> {
    return this._http.get<IProduct[]>(this._productUrl)
    .do(data=>console.log('All: ' + JSON.stringify(data)))
    .catch(this.handleError);
}


private handleError(err : HttpErrorResponse){
    console.log(err.message);
    return Observable.throw(err.message)
}

它在哪里错了,我应该怎么做才能解决它？

图像：坐标变换的描述

我想知道如何用 Markdown 语法编写图中所示的前导上标和下标？

从 openfire rest api 获取用户实体时，我收到以下错误消息。（我正在用 openfire Restapi 端点包装我的 Api 端点。）

“错误”：“内部服务器错误”，“异常”：“org.springframework.http.converter.HttpMessageNotWritableException”，“消息”：“无法编写 JSON：找不到类 java.io.ByteArrayInputStream 的序列化程序，也未发现任何属性创建 BeanSerializer（为了避免异常，禁用 SerializationFeature.FAIL_ON_EMPTY_BEANS）；嵌套异常是 com.fasterxml.jackson.databind.JsonMappingException: No serializer found for class java.io.ByteArrayInputStream 并且没有发现创建 BeanSerializer 的属性（为了避免异常，禁用SerializationFeature.FAIL_ON_EMPTY_BEANS)（通过参考链：com.mashape.unirest.http.HttpResponse[\"rawBody\"])", "path": "/usersInfo/user2"

代码如下。

String  host ="http://abdul01anpi01:9090" ;
String userEndPoint = "/plugins/restapi/v1/users" ;
String apiURL = host+userEndPoint ;
HttpResponse<JsonNode> response =null;

response = Unirest.get(apiURL +"/{username}").header("accept", "application/json").header("Content-Type", "application/json").routeParam("username",String.valueOf(username)).asJson();

响应的预期输出如下。

{
    "username": "user2",
    "name": "user2",
    "properties": null
}

请建议，任何帮助表示赞赏。

问题:

在我的角度5+应用程序项目中,在我的一个子文件夹中,在我输入命令后ng g c my-component,没有生成,相反,它弹出一些未知错误,任何人都知道这里发生了什么？我已经多次重新安装了npm/angular @ cli.

jocs@Jocs ~/r/s/a/pages (devReno)> ng g c my-new-component
Error: Could not find (undefined)
Could not find (undefined)
jocs@Jocs ~/r/s/a/pages (devReno) [1]> ng generate component my-new-component
Error: Could not find (undefined)
Could not find (undefined)
jocs@Jocs ~/r/s/a/pages (devReno) [1]>

开发环境:

操作系统:darwin x64(Mac OS:10.13.4)

Angular CLI:1.7.4

节点:9.11.1

Angular:5.2.9

在安装依赖项并运行node.js应用程序后，在node.js中使用ElasticSearch API会导致以下错误。

Elasticsearch ERROR: 2017-04-11T04:40:01Z
  Error: Request error, retrying
  POST http://localhost:9200/reports/report/_search?size=5000000 => connect ECONNREFUSED 127.0.0.1:9200
      at Log.error (/home/kartik/Documents/Project/Validus/validus_reports_server/node_modules/elasticsearch/src/lib/log.js:225:56)
      at checkRespForFailure (/home/kartik/Documents/Project/Validus/validus_reports_server/node_modules/elasticsearch/src/lib/transport.js:240:18)
      at HttpConnector.<anonymous> (/home/kartik/Documents/Project/Validus/validus_reports_server/node_modules/elasticsearch/src/lib/connectors/http.js:162:7)
      at ClientRequest.wrapper (/home/kartik/Documents/Project/Validus/validus_reports_server/node_modules/lodash/lodash.js:4968:19)
      at emitOne (events.js:77:13)
      at ClientRequest.emit (events.js:169:7)
      at Socket.socketErrorListener (_http_client.js:258:9)
      at emitOne (events.js:77:13)
      at Socket.emit (events.js:169:7)
      at emitErrorNT (net.js:1256:8)

{ [Error: No Living connections]
  message: 'No Living connections',
  body: undefined,
  status: undefined }

帮我解决这个问题

我在angular4项目中使用https://material.angular.io/components/component/datepicker.如何在输入框中用"2017年5月29日"等短格式格式化所选日期.目前显示为2017年5月29日

示例代码:

<md-input-container>
  <input mdInput readonly="true" [mdDatepicker]="startDatePicker" [mdDatepickerFilter]="myFilter" [min]="minDate" [max]="maxDate" class="date-text ng-dirty ng-valid-parse ng-touched ng-not-empty ng-valid ng-valid-required" placeholder="Choose a date">
  <button mdSuffix [mdDatepickerToggle]="startDatePicker" class="date-icon"></button>
</md-input-container>

<md-datepicker #startDatePicker [dateFormat]="'LL'" startView="month" [startAt]="currentDate"></md-datepicker>

TS:

@ViewChild('startDatePicker') startDatePicker: MdDatepicker<Date>;

PS.[dateFormat] ="'LL'"无效

错误TypeError：

val.slice不是函数

dataTable配置

$.p-dataTable #dt [value]="customers" [(selection)]="chkBoxSelect" 
 dataKey="customerId" [rows]="10" [paginator]="true" 
 paginatorPosition="both" [pageLinks]="5" [rowsPerPageOptions]="[5,10,20]" 
 [globalFilter]="gb" [headerCheckboxToggleAllPages]="false" 
 [editable]="true" exportFilename="customers" [lazy]="true" 
 [totalRecords]="totalRecords" onLazyLoad)="loadCustomersByPage($event)"

回拨功能

$loadCustomersByPage(event: LazyLoadEvent) {

    const parameters = "?page=" + event.first + "&size=" + (event.first + event.rows);

     this._cs.findAllActiveCustomerDetailsByPage(parameters).subscribe(
       (data: any) => {
         this.customers = data;
       },
       (error) => {
          console.log("--error--" + error)
       }
  );
}