使用 HTTP GET 请求获取 Angular Material Table 中的数据 [英] Using HTTP GET request to fetch data in an Angular Material Table

问题描述

我有一个 Angular Material 表，我想在其中从服务中获取数据.这是我的服务.

import { Injectable } from "@angular/core";从@angular/common/http"导入 { HttpClient };从'../messages/message-table/message.model'导入{消息}；@Injectable()导出类 MessageService {构造函数(私有 http:HttpClient){}getMessageTableData() {return this.http.get('');}}

这是数据的接口Message

export interface Message {请求ID:字符串；请求状态:字符串；请求者名称:字符串；提交日期:字符串；审批人名称:字符串；批准日期:字符串；主题:字符串；消息状态:字符串；读取状态:字符串；}

在我的 component.ts 文件中，我可以使用这个在控制台中显示数据，

ngOnInit() {this.messageService.getMessageTableData().subscribe((响应) =>控制台日志(响应))}

我已经在 Angular 材料的网站上看到了示例代码，但由于我的表上有很多客户端过滤，我想使用 MatTableDataSource 作为我的数据源.该示例使用自定义数据源，我无法在其中包含我的过滤器.如何在我的表中显示来自我的服务的 JSON 格式的数据?

同时附上我的表格的 HTML 代码

<ng-container matColumnDef="RequestID"><th mat-h​​eader-cell *matHeaderCellDef mat-sort-header>请求 ID </th><td mat-cell *matCellDef="let element">{{element.RequestID}} </td></ng-容器><ng-container matColumnDef="RequestStatus"><th mat-h​​eader-cell *matHeaderCellDef mat-sort-header>请求状态<td mat-cell *matCellDef="let element">{{element.RequestStatus}} </td></ng-容器><ng-container matColumnDef="RequestorName"><th mat-h​​eader-cell *matHeaderCellDef mat-sort-header>请求者名称</th><td mat-cell *matCellDef="let element">{{element.RequestorName}} </td></ng-容器><ng-container matColumnDef="SubmissionDate"><th mat-h​​eader-cell *matHeaderCellDef mat-sort-header>提交日期</th><td mat-cell *matCellDef="let element">{{element.SubmissionDate}} </td></ng-容器><ng-container matColumnDef="ApproverName"><th mat-h​​eader-cell *matHeaderCellDef mat-sort-header>批准人名称</th><td mat-cell *matCellDef="let element">{{element.ApproverName}} </td></ng-容器><ng-container matColumnDef="ApprovalDate"><th mat-h​​eader-cell *matHeaderCellDef mat-sort-header>批准日期 </th><td mat-cell *matCellDef="let element">{{element.ApprovalDate}} </td></ng-容器><ng-container matColumnDef="主题"><th mat-h​​eader-cell *matHeaderCellDef mat-sort-header>主题</th><td mat-cell *matCellDef="let element">{{element.Subject}} </td></ng-容器><ng-container matColumnDef="MessageStatus"><th mat-h​​eader-cell *matHeaderCellDef mat-sort-header>消息状态</th><td mat-cell *matCellDef="let element">{{element.MessageStatus}} </td></ng-容器><ng-container matColumnDef="ReadStatus"><th mat-h​​eader-cell *matHeaderCellDef mat-sort-header>读取状态 </th><td mat-cell *matCellDef="let element">{{element.ReadStatus}} </td></ng-容器>

解决方案

您需要创建 MatTableDataSource 的实例并将您从服务中获取的数据传递给它.像这样:

import { MatSort, MatTableDataSource } from '@angular/material';...@成分({...})导出类 TableComponent 实现 OnInit {...数据源;@ViewChild(MatSort) 排序:MatSort；ngOnInit() {this.messageService.getMessageTableData().订阅(响应=> {this.dataSource = new MatTableDataSource(response);this.dataSource.sort = this.sort;});}...}

<小时><块引用>

这是一个 工作示例 StackBlitz 供您参考.

I have an Angular Material table in which I want to fetch data from a service. This is my service.

import { Injectable } from "@angular/core";
import { HttpClient } from "@angular/common/http";
import { Message } from '../messages/message-table/message.model';

@Injectable()

export class MessageService {
  constructor(private http: HttpClient) {}

  getMessageTableData() {
    return this.http.get<Message[]>('<removed>');
  }
}

This is the interface Message for the data

export interface Message {
    RequestID: string;
    RequestStatus: string;
    RequestorName: string;
    SubmissionDate: string;
    ApproverName: string;
    ApprovalDate: string;
    Subject: string;
    MessageStatus: string;
    ReadStatus: string;
  }

In my component.ts file, I'm able to display the data in console using this,

ngOnInit() {

    this.messageService.getMessageTableData().subscribe(
      (response) => console.log(response)
    )
}

I've seen the example code on Angular material's website but since I have a lot of client side filtering on my table, I want to use MatTableDataSource for my dataSource. That example uses a custom dataSource and I'm not able to include my filters in that. How can I display this data, which is coming in JSON form from my service, in my table?

Attaching the HTML code for my table as well

<table mat-table [dataSource]="dataSource" matSort class="mat-elevation-z8">
    <ng-container matColumnDef="RequestID">
        <th mat-header-cell *matHeaderCellDef mat-sort-header> Request ID </th>
        <td mat-cell *matCellDef="let element"> {{element.RequestID}} </td>
    </ng-container>

    <ng-container matColumnDef="RequestStatus">
        <th mat-header-cell *matHeaderCellDef mat-sort-header> Request Status </th>
        <td mat-cell *matCellDef="let element"> {{element.RequestStatus}} </td>
    </ng-container>

    <ng-container matColumnDef="RequestorName">
        <th mat-header-cell *matHeaderCellDef mat-sort-header> Requestor Name </th>
        <td mat-cell *matCellDef="let element"> {{element.RequestorName}} </td>
    </ng-container>

    <ng-container matColumnDef="SubmissionDate">
        <th mat-header-cell *matHeaderCellDef mat-sort-header> Submission Date </th>
        <td mat-cell *matCellDef="let element"> {{element.SubmissionDate}} </td>
    </ng-container>

    <ng-container matColumnDef="ApproverName">
        <th mat-header-cell *matHeaderCellDef mat-sort-header> Approver Name </th>
        <td mat-cell *matCellDef="let element"> {{element.ApproverName}} </td>
    </ng-container>

    <ng-container matColumnDef="ApprovalDate">
        <th mat-header-cell *matHeaderCellDef mat-sort-header> Approval Date </th>
        <td mat-cell *matCellDef="let element"> {{element.ApprovalDate}} </td>
    </ng-container>

    <ng-container matColumnDef="Subject">
        <th mat-header-cell *matHeaderCellDef mat-sort-header> Subject </th>
        <td mat-cell *matCellDef="let element"> {{element.Subject}} </td>
    </ng-container>

    <ng-container matColumnDef="MessageStatus">
        <th mat-header-cell *matHeaderCellDef mat-sort-header> Message Status </th>
        <td mat-cell *matCellDef="let element"> {{element.MessageStatus}} </td>
    </ng-container>

    <ng-container matColumnDef="ReadStatus">
        <th mat-header-cell *matHeaderCellDef mat-sort-header> Read Status </th>
        <td mat-cell *matCellDef="let element"> {{element.ReadStatus}} </td>
    </ng-container>
</table>

解决方案

You'll need to create an instance of the MatTableDataSource and pass it the data that you're getting from your service. Something like this:

import { MatSort, MatTableDataSource } from '@angular/material';
...

@Component({...})
export class TableComponent implements OnInit {
  ...
  dataSource;

  @ViewChild(MatSort) sort: MatSort;

  ngOnInit() {
    this.messageService.getMessageTableData()
      .subscribe(response => {
        this.dataSource = new MatTableDataSource(response);
        this.dataSource.sort = this.sort;
      });
  }

  ...

}

---

Here's a Working Sample StackBlitz for your ref.

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