我正在使用 Angular 8 構建一個單頁應用程序。我有一個表，其值現在硬編碼在 .ts 文件中，如下所示： displayedColumns = ['select', 'position', 'name', 'weight', 'symbol']; dataSource = new MatTableDataSource<Element>(ELEMENT_DATA); selection = new SelectionModel<Element>(true, []);const ELEMENT_DATA: Element[] = [ {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'},];我在 .ts 文件中編寫了一個函數來輸出所選行，如下所示：selectedRow() { const rowNumber = this.selection.selected; console.log("row number that is selected : " + rowNumber); }然后，html 文件實現代碼來顯示該表以及復選框，如下所示：<div class="example-container mat-elevation-z8"> <mat-table #table [dataSource]="dataSource"> <!-- Checkbox Column --> <ng-container matColumnDef="select"> <mat-header-cell *matHeaderCellDef> <mat-checkbox (change)="$event ? masterToggle() : null" [checked]="selection.hasValue() && isAllSelected()" [indeterminate]="selection.hasValue() && !isAllSelected()"> </mat-checkbox> </mat-header-cell> <mat-cell *matCellDef="let row"> <mat-checkbox (click)="$event.stopPropagation(); selectedRow()" (change)="$event ? selection.toggle(row) : null" [checked]="selection.isSelected(row)"> </mat-checkbox> </mat-cell> </ng-container> <!-- Position Column --> <ng-container matColumnDef="position"> <mat-header-cell *matHeaderCellDef> No. </mat-header-cell> <mat-cell *matCellDef="let element"> {{element.position}} </mat-cell> </ng-container>現在應用程序中會顯示一個行表。SelectedRow() 函數在以下行中實現<mat-checkbox (click)="$event.stopPropagation(); selectedRow()"因此，當我選中任何特定行中的復選框時，就會調用該函數。但該函數的輸出是所選的行號：這意味著不顯示實際的行號。我計劃在此之后實現的功能將需要行號或所選行中的某種值。誰能告訴我為什么沒有檢索到行號信息？下面是表的屏幕截圖和行選擇的輸出。
1 回答
蕪湖不蕪
TA貢獻1796條經驗 獲得超7個贊
可以參考下面的代碼，
? <table mat-table [dataSource]="dataSource" class="mat-elevation-z8">
? <!--- Note that these columns can be defined in any order.
? ? ? ? The actual rendered columns are set as a property on the row definition" -->
<ng-container matColumnDef="select">
? ? ? <mat-header-cell *matHeaderCellDef>
? ? ? ? <mat-checkbox (change)="selectAll()"
? ? ? ? ? ? ? ? ? ? ? [checked]="allSelected"
? ? ? ? ? ? ? ? ? ? ? [indeterminate]="!allSelected && oneSelected">
? ? ? ? </mat-checkbox>?
? ? ? </mat-header-cell>
? ? ? <mat-cell *matCellDef="let element">
? ? ? ? <mat-checkbox (change)="change(element)" [checked]="element.selected">
? ? ? ? </mat-checkbox>
? ? ? </mat-cell>
? ? </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;"></tr>
</table>
打字稿
export interface PeriodicElement {
? name: string;
? position: number;
? weight: number;
? symbol: string;
? selected?:boolean
}
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'},
];
/**
?* @title Basic use of `<table mat-table>`
?*/
@Component({
? selector: 'table-basic-example',
? styleUrls: ['table-basic-example.css'],
? templateUrl: 'table-basic-example.html',
})
export class TableBasicExample {
? displayedColumns: string[] = ['select','position', 'name', 'weight', 'symbol'];
? dataSource = ELEMENT_DATA
? oneSelected=false;
? allSelected=false;
?change(element:PeriodicElement){
? ?let e= this.dataSource.find(item=>item.position===element.position);
? ?if(e){
? ? ? e.selected=true;
? ?}
? ?this.oneSelected=this.dataSource.filter(item=>item.selected).length>0
?}
?selectAll(){
? ?if(this.allSelected || !this.oneSelected){
? ?this.dataSource.forEach(item=>item.selected= false);??
? ?this.allSelected=true;
? ?}else{
? ? ?this.dataSource.forEach(item=>item.selected= true);
? ? ?this.allSelected=false;
? ? ?this.oneSelected=false;
? ?}
?}
}
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