【发布时间】：2018-11-08 04:27:08
【问题描述】：
我实际上是在尝试在 Material Design 和 Angular 6 的表格组件中插入一个单选按钮组。
所以在 Material design 官方网站的示例中，有一个带有复选框的表格，但我想要对表格的每个元素都使用单选按钮。
我尝试使用 *ngFor 指令执行此操作，但我无法访问 ELEMENT_DATA 数组，即使它是全局常量。
import {Component} from '@angular/core';
import {MatTableDataSource} from '@angular/material';
import {SelectionModel} from '@angular/cdk/collections';
@Component({
selector: 'table-selection-example',
styleUrls: ['table-selection-example.css'],
templateUrl: 'table-selection-example.html',
})
export class TableSelectionExample {
displayedColumns = ['select', 'position', 'name', 'weight', 'symbol'];
dataSource = new MatTableDataSource<PeriodicElement>(ELEMENT_DATA);
selection = new SelectionModel<PeriodicElement>(true, []);
isAllSelected() {
const numSelected = this.selection.selected.length;
const numRows = this.dataSource.data.length;
return numSelected === numRows;
}
masterToggle() {
this.isAllSelected() ?
this.selection.clear() :
this.dataSource.data.forEach(row => this.selection.select(row));
}
}
export interface PeriodicElement {
name: string;
position: number;
weight: number;
symbol: string;
}
const ELEMENT_DATA: PeriodicElement[] = [
{position: 1, name: 'Hydrogen', weight: 1.0079, symbol: 'H'},
{position: 2, name: 'Helium', weight: 4.0026, symbol: 'He'},
{position: 3, name: 'Lithium', weight: 6.941, symbol: 'Li'},
{position: 4, name: 'Beryllium', weight: 9.0122, symbol: 'Be'},
{position: 5, name: 'Boron', weight: 10.811, symbol: 'B'},
{position: 6, name: 'Carbon', weight: 12.0107, symbol: 'C'},
{position: 7, name: 'Nitrogen', weight: 14.0067, symbol: 'N'},
{position: 8, name: 'Oxygen', weight: 15.9994, symbol: 'O'},
{position: 9, name: 'Fluorine', weight: 18.9984, symbol: 'F'},
{position: 10, name: 'Neon', weight: 20.1797, symbol: 'Ne'},
];
<table mat-table [dataSource]="dataSource" class="mat-elevation-z8">
<!-- Checkbox Column -->
<ng-container matColumnDef="select">
<th mat-header-cell *matHeaderCellDef>
<mat-checkbox (change)="$event ? masterToggle() : null"
[checked]="selection.hasValue() && isAllSelected()"
[indeterminate]="selection.hasValue() && !isAllSelected()">
</mat-checkbox>
</th>
<td mat-cell *matCellDef="let row">
<mat-checkbox (click)="$event.stopPropagation()"
(change)="$event ? selection.toggle(row) : null"
[checked]="selection.isSelected(row)">
</mat-checkbox>
</td>
</ng-container>
<!-- Position Column -->
<ng-container matColumnDef="position">
<th mat-header-cell *matHeaderCellDef> No. </th>
<td mat-cell *matCellDef="let element"> {{element.position}} </td>
</ng-container>
<!-- Name Column -->
<ng-container matColumnDef="name">
<th mat-header-cell *matHeaderCellDef> Name </th>
<td mat-cell *matCellDef="let element"> {{element.name}} </td>
</ng-container>
<!-- Weight Column -->
<ng-container matColumnDef="weight">
<th mat-header-cell *matHeaderCellDef> Weight </th>
<td mat-cell *matCellDef="let element"> {{element.weight}} </td>
</ng-container>
<!-- Symbol Column -->
<ng-container matColumnDef="symbol">
<th mat-header-cell *matHeaderCellDef> Symbol </th>
<td mat-cell *matCellDef="let element"> {{element.symbol}} </td>
</ng-container>
<tr mat-header-row *matHeaderRowDef="displayedColumns"></tr>
<tr mat-row *matRowDef="let row; columns: displayedColumns;"
(click)="selection.toggle(row)">
</tr>
</table>
因此，我想使用此代码删除复选框并将其替换为单选按钮。
我尝试的是：
<mat-radio-group>
<mat-radio-button *ngIf="let i of ELEMENT_DATA" value = i></mat-radio-button>
</mat-radio-button>
就像我之前所说的，我无法访问我的数组 ELEMENT_DATA。我也尝试用 dataSource.length 更改它，但没有任何效果。
感谢您的帮助。
【问题讨论】：
标签： angular radio-button material-design