标题仍然出现错误。我已经检查了类似主题的所有解决方案,但没有任何效果。这是我的HTML文件:
<div>
<br>
<mat-card>
<button mat-raised-button color="primary">Add</button>
<br><br>
<mat-divider></mat-divider>
<br>
<table mat-table [dataSource]="events">
<ng-container matColumnDef="EventName">
<th mat-header-cell *matHeaderCellDif>Name</th>
<td mat-cell *matCellDef="let element">{{element.EventName}}</td>
</ng-container>
<ng-container matColumnDef="EventLocation">
<th mat-header-cell *matHeaderCellDif>Location</th>
<td mat-cell *matCellDef="let element">{{element.EventLocation}}</td>
</ng-container>
<ng-container matColumnDef="EventDate">
<th mat-header-cell *matHeaderCellDif>Date</th>
<td mat-cell *matCellDef="let element">{{element.EventDate}}</td>
</ng-container>
<ng-container matColumnDef="EventReq">
<th mat-header-cell *matHeaderCellDif>Req</th>
<td mat-cell *matCellDef="let element">{{element.EventReq}}</td>
</ng-container>
<ng-container matColumnDef="actions">
<th mat-header-cell *matHeaderCellDif>Actions</th>
<td mat-cell *matCellDef="let element">
<button mat-button color="primary">Details</button>
</td>
</ng-container>
<tr mat-header-row *matHeaderRowDef="displayedColumns"></tr>
<tr mat-row *matRowDef="let row; columns: displayedColumns;"></tr>
</table>
我是使用角和角材料库的初学者,所以我可能错过了一个命令。
events.component.ts:
import { Component, OnInit } from '@angular/core';
import { Router } from '@angular/router';
import { Event } from '../event.module';
import { EventService } from '../_services/event/event.service';
import { MatTableDataSource } from '@angular/material';
@Component({
selector: 'app-events',
templateUrl: './events.component.html',
styleUrls: ['./events.component.css']
})
export class EventsComponent implements OnInit {
events: Event[];
displayedColumns = ['EventName', 'EventLocation', 'EventDate', 'EventReq'];
constructor(private eventService: EventService, private router: Router) {}
ngOnInit() {
this.fetchEvents();
}
fetchEvents() {
this.eventService.getEvents().subscribe((data: Event[]) => {
this.events = data;
console.log('Waiting ...');
console.log(this.events);
});
}
}
任何建议都会很有帮助。谢谢您的宝贵时间。
此错误在控制台中出现了四次,可能出现在每个ng-container中。
答案 0 :(得分:1)
您已经写过:matHeaderCellDif而不是matHeaderCellDef
因此表格尝试使用MatHeaderCellDef选择器选择模板(返回未定义)
答案 1 :(得分:1)
您用matHeaderCellDef
输错了matHeaderCellDif