问题描述
对不起,但我对这个感到困惑.
Sorry but I'm in the dark with this one.
我有一个返回对象数组的方法,我使用该对象数组显示一个表.这是我正在使用的功能:
I have a method that returns an array of objects and I use that array of objects to display a table. this is the function that I'm using:
getCompetitions(): Promise<Competition[]> {
let options: RequestOptionsArgs = {};
let params = new URLSearchParams();
params.append('size', '250');
options.params = params;
return this.http.get(this.competitionsUrl,options)
.toPromise()
.then(response => response.json()._embedded.competitions as Competition[])
.catch(this.handleError);
}
我的 ngOnInit()方法在启动时调用该函数,并获得了由 ngFor 迭代的一系列比赛,而我在创建表时没有遇到任何问题.
My ngOnInit() method was calling that function on start and getting an array of competitions which was iterated with ngFor and I was creating the table without a problem.
我想要的是实现md-table或cdk-table组件.我有使用该UI库的其余应用程序.
What I want is to implement md-table or cdk-table component. I have the rest of the app using that UI library.
- 我知道我的进口货是正确的.
- HTML似乎很好,因为显示了我拥有的单个标头
- 控制台中没有错误,但是 competitionsDataSource 似乎为空.
- I know my imports are correct.
- The HTML seems to be fine because the single header I have is displayed
- There are no errors in the console but the competitionsDataSource seems to be Empty.
我在下面添加文件,我知道问题出在实现中或我试图填充数据源的方式.
I add my files below, I know the problem is in the implementation or how I'm trying to populate the dataSource.
这是比赛课程:
export class Competition {
compName: string;
compStart: Date;
compEnd: Date;
compFull: number;
compTeamCount: number;
compChamp: number;
compRunnerup: number;
compType: number;
compCountry: string;
_links: {
self: {
href: string;
},
matches: {
href: string;
}
}
}
这是组件
import { Component, OnInit } from '@angular/core';
import { DataSource } from '@angular/cdk';
import { Observable } from 'rxjs/Observable';
import { BehaviorSubject } from 'rxjs/BehaviorSubject';
import { Competition } from '../../competition/competition';
import { CompetitionService } from '../../competition/competition.service'
import 'rxjs/add/operator/startWith';
import 'rxjs/add/observable/merge';
import 'rxjs/add/operator/map';
@Component({
selector: 'comp-table-cmp',
moduleId: module.id,
templateUrl: 'competitions-table.component.html',
})
export class CompetitionsTableComponent{
//1- Define my columns
displayedColumns = ['compName'];
//2- Define the database as a new database
competitionsDatabase = new CompetitionsDatabase();
//3- Define the datasource
competitionsDatasource: CompetitionsDatasource | null;
ngOnInit() {
//4 - declare the datasource.
this.competitionsDatasource = new CompetitionsDatasource(this.competitionsDatabase);
console.log(this.competitionsDatasource);
}
}
export class CompetitionsDatabase {
competitions: Competition[];
dataChange: BehaviorSubject<Competition[]> = new BehaviorSubject<Competition[]>([]);
get data(): Competition[] {
this.competitions = [];
this.competitionService.getCompetitions().then(
results => {
results.forEach(result => {
if (result.compType === 1) {
this.competitions.push(result);
this.dataChange.next(results);
}
//Call Method to retrieve team names.
});
return results;
}
)
console.log(this.dataChange);
return this.competitions;
}
constructor(
private competitionService: CompetitionService,
) {}
}
export class CompetitionsDatasource extends DataSource<any> {
constructor(private _exampleDatabase: CompetitionsDatabase) {
super();
}
/** Connect function called by the table to retrieve one stream containing the data to render. */
connect(): Observable<Competition[]> {
console.log('ExampleDataSource#connect')
return this._exampleDatabase.dataChange;
}
disconnect() {}
}
和HTML :
<div class="example-container mat-elevation-z8">
<cdk-table #table [dataSource]="CompetitionsDatasource" class="example-table">
<!--- Note that these columns can be defined in any order.
The actual rendered columns are set as a property on the row definition" -->
<!-- CompName Column -->
<ng-container cdkColumnDef="compName">
<cdk-header-cell *cdkHeaderCellDef class="example-header-cell"> CompName </cdk-header-cell>
<cdk-cell *cdkCellDef="let row" class="example-cell"> {{competition.compName}} </cdk-cell>
</ng-container>
<cdk-header-row *cdkHeaderRowDef="displayedColumns" class="example-header-row"></cdk-header-row>
<cdk-row *cdkRowDef="let row; columns: displayedColumns;" class="example-row"></cdk-row>
</cdk-table>
</div>
结果只是标题"CompName"
The result is just the header "CompName"
请帮助!
推荐答案
您无法定义let row
,然后将数据绑定到{{competition.compName}}
.您需要将声明切换为let competition
或使用row
进行数据绑定.
You can't define let row
and then do data binding to {{competition.compName}}
. You need to switch the declaration to let competition
OR do the data binding with row
.
要么:
<cdk-cell *cdkCellDef="let row" class="example-cell"> {{row.compName}} </cdk-cell>
或者:
<cdk-cell *cdkCellDef="let competition" class="example-cell"> {{competition.compName}} </cdk-cell>
此外,您可以通过仅扩展DataSource
类来进行数据检索和connect()
.这是表格简化版的柱塞示例.
Also, you can do the data retrieval and connect()
by extending DataSource
class only. Here's a Plunker example of simplified version of your table.
这篇关于如何将md表(cdk数据表)连接到用作数据源的服务?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!