如何将数据动态添加到 mat-table 数据源? [英] How to add data dynamically to mat-table dataSource?

问题描述

我有来自后端的数据流，我看到它在控制台中打印，现在我正在尝试将事件推送到 dataSource 其抛出的错误数据源未定义.有人可以帮助如何动态添加数据以实现表吗?

I have data streaming from backend and i see it printing in console now i am trying to push event to dataSource its throwing error dataSource is not defined. Can someone help how to dynamically add data to materialize table ?

stream.component.html

stream.component.html

<mat-table #table [dataSource]="dataSource"></mat-table>

stream.component.ts

stream.component.ts

import {
    Component,
    OnInit
} from '@angular/core';
import {
    StreamService
} from '../stream.service';
import {
    MatTableDataSource
} from '@angular/material';
import * as io from 'socket.io-client';

@Component({
    selector: 'app-stream',
    templateUrl: './stream.component.html',
    styleUrls: ['./stream.component.css']
})
export class StreamComponent implements OnInit {
    displayedColumns = ['ticketNum', "assetID", "severity", "riskIndex", "riskValue", "ticketOpened", "lastModifiedDate", "eventType"];
    dataSource: MatTableDataSource < Element[] > ;
    socket = io();

    constructor(private streamService: StreamService) {};

    ngOnInit() {
        this.streamService.getAllStream().subscribe(stream => {
            this.dataSource = new MatTableDataSource(stream);
        });
        this.socket.on('newMessage', function(event) {
            console.log('Datasource', event);
            this.dataSource.MatTableDataSource.filteredData.push(event);
        });
    }
}


export interface Element {
    ticketNum: number;
    ticketOpened: number;
    eventType: string;
    riskIndex: string;
    riskValue: number;
    severity: string;
    lastModifiedDate: number;
    assetID: string;
}

推荐答案

我已经找到了解决这个问题的方法，基本上如果你这样做:

I have found a solution for this problem, basically if you do:

this.dataSource.data.push(newElement);//不起作用

但是如果您替换完整的数组，则它可以正常工作.所以你的最终代码必须是:

But if you replace the complete array then it works fine. So your final code must be :

this.socket.on('newMessage', function(event) {
    const data = this.dataSource.data;
    data.push(event);
    this.dataSource.data = data;
});

您可以在此处查看问题 -> https://github.com/angular/material2/问题/8381

You can see the issue here -> https://github.com/angular/material2/issues/8381

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