为什么 angular table 没有排序?
Why angular table didn't sort?
这里是 table.component.ts 文件。我想像 angular 的这个例子一样对 table 进行排序:
https://material.angular.io/components/sort/overview 但在本例中,它没有对任何内容进行排序。不知道是什么问题
首先我在 child.module.ts 中导入了模块:
import { MatTableModule } from '@angular/material/table';
import { MatSortModule } from "@angular/material/sort";
导入模块:
import: [
MatTableModule,
MatSortModule
]
这里是 table.component.ts 文件:
import { MatPaginator } from '@angular/material/paginator';
import { MatSort } from '@angular/material/sort';
import { MatTableDataSource } from '@angular/material/table';
export interface PeriodicElement {
timestamp: string;
key: string;
value: number;
}
export class TableComponent implements OnInit {
loadingData = false;
displayedColumns: string[] = ['data', 'key', 'value'];
ELEMENT_DATA: PeriodicElement[] = new Array<PeriodicElement>();
dataSource = new MatTableDataSource<PeriodicElement>(this.ELEMENT_DATA);
datastructure: Array<dataschema> = [];
sortedData: PeriodicElement[];
//sort data
@ViewChild(MatPaginator, { static: false }) paginator: MatPaginator;
@ViewChild(MatSort, { static: false }) sort: MatSort;
constructor(private Service: Service) {
this.sortedData = this.ELEMENT_DATA.slice() }
exportTable() {
TableUtil.exportTableToExcel("ExampleTable");
}
ngAfterViewInit(): void {
this.dataSource.sort = this.sort;
}
ngOnInit(): void {
this.dataSource.paginator = this.paginator;
this.dataSource.sort = this.sort;
this.loadingData = true;
this.Service.getContent().then(results => {
this.datastructure = results;
this.loadingData = false;
for (let i = 0; i < this.datastructure.length; i++) {
cut off code
}
})
}
sortData(sort: Sort) {
const data = this.ELEMENT_DATA.slice();
if (!sort.active || sort.direction === '') {
this.sortedData = data;
return;
}
this.sortedData = data.sort((a, b) => {
const isAsc = sort.direction === 'asc';
switch (sort.active) {
case 'data': return compare(a.data, b.data, isAsc);
case 'key': return compare(a.key, b.key, isAsc);
case 'value': return compare(a.value, b.value, isAsc);
default: return 0;
}
})
}
}
function compare(a: number | string, b: number | string, isAsc: boolean) {
return (a < b ? -1 : 1) * (isAsc ? 1 : -1);
}
html 视图:
<div *ngIf="!loadingData" class="mat-elevation-z8">
<table id="ExampleTable" mat-table matTableExporter [dataSource]="dataSource" matSort (matSortChange)="sortData($event)" class="mat-elevation-z8">
<!--Example Column/Row-->
<ng-container matColumnDef="data">
<th mat-header-cell mat-sort-header *matHeaderCellDef > data </th>
<td mat-cell *matCellDef="let element"> {{element.data}} </td>
</ng-container>
</table>
</div>
问题出在 ViewChild 中。有错别字。您正在尝试获取 MatSort。但它是 matSort.
TS
@ViewChild(MatSort, { static: false }) sort: MatSort;
HTML
<table id="ExampleTable" mat-table matTableExporter [dataSource]="dataSource" matSort class="mat-elevation-z8">
改为尝试下面的代码,
TS
@ViewChild('exampleTableTableSort, { static: false }) sort: MatSort;
HTML
<table #exampleTableTableSort='matSort' id="ExampleTable" mat-table matTableExporter [dataSource]="dataSource" matSort class="mat-elevation-z8">
如果你有*ngIf
下的数据Angular无法达到所以我建议给Angular喘口气(附上dataSource.paginator和this.dataSource.sort 在 setTimeout
this.Service.getContent().then(results => {
this.datastructure = results;
this.loadingData = false;
setTimeout(()=>{
this.dataSource.paginator = this.paginator;
this.dataSource.sort = this.sort;
})
})
无论如何,material Angular 为您排序数据,我无法理解您的函数 sort 和您的变量 sortedData。您只需要 datasource.data 等于 API
的响应
这里是 table.component.ts 文件。我想像 angular 的这个例子一样对 table 进行排序: https://material.angular.io/components/sort/overview 但在本例中,它没有对任何内容进行排序。不知道是什么问题
首先我在 child.module.ts 中导入了模块:
import { MatTableModule } from '@angular/material/table';
import { MatSortModule } from "@angular/material/sort";
导入模块:
import: [
MatTableModule,
MatSortModule
]
这里是 table.component.ts 文件:
import { MatPaginator } from '@angular/material/paginator';
import { MatSort } from '@angular/material/sort';
import { MatTableDataSource } from '@angular/material/table';
export interface PeriodicElement {
timestamp: string;
key: string;
value: number;
}
export class TableComponent implements OnInit {
loadingData = false;
displayedColumns: string[] = ['data', 'key', 'value'];
ELEMENT_DATA: PeriodicElement[] = new Array<PeriodicElement>();
dataSource = new MatTableDataSource<PeriodicElement>(this.ELEMENT_DATA);
datastructure: Array<dataschema> = [];
sortedData: PeriodicElement[];
//sort data
@ViewChild(MatPaginator, { static: false }) paginator: MatPaginator;
@ViewChild(MatSort, { static: false }) sort: MatSort;
constructor(private Service: Service) {
this.sortedData = this.ELEMENT_DATA.slice() }
exportTable() {
TableUtil.exportTableToExcel("ExampleTable");
}
ngAfterViewInit(): void {
this.dataSource.sort = this.sort;
}
ngOnInit(): void {
this.dataSource.paginator = this.paginator;
this.dataSource.sort = this.sort;
this.loadingData = true;
this.Service.getContent().then(results => {
this.datastructure = results;
this.loadingData = false;
for (let i = 0; i < this.datastructure.length; i++) {
cut off code
}
})
}
sortData(sort: Sort) {
const data = this.ELEMENT_DATA.slice();
if (!sort.active || sort.direction === '') {
this.sortedData = data;
return;
}
this.sortedData = data.sort((a, b) => {
const isAsc = sort.direction === 'asc';
switch (sort.active) {
case 'data': return compare(a.data, b.data, isAsc);
case 'key': return compare(a.key, b.key, isAsc);
case 'value': return compare(a.value, b.value, isAsc);
default: return 0;
}
})
}
}
function compare(a: number | string, b: number | string, isAsc: boolean) {
return (a < b ? -1 : 1) * (isAsc ? 1 : -1);
}
html 视图:
<div *ngIf="!loadingData" class="mat-elevation-z8">
<table id="ExampleTable" mat-table matTableExporter [dataSource]="dataSource" matSort (matSortChange)="sortData($event)" class="mat-elevation-z8">
<!--Example Column/Row-->
<ng-container matColumnDef="data">
<th mat-header-cell mat-sort-header *matHeaderCellDef > data </th>
<td mat-cell *matCellDef="let element"> {{element.data}} </td>
</ng-container>
</table>
</div>
问题出在 ViewChild 中。有错别字。您正在尝试获取 MatSort。但它是 matSort.
TS
@ViewChild(MatSort, { static: false }) sort: MatSort;
HTML
<table id="ExampleTable" mat-table matTableExporter [dataSource]="dataSource" matSort class="mat-elevation-z8">
改为尝试下面的代码,
TS
@ViewChild('exampleTableTableSort, { static: false }) sort: MatSort;
HTML
<table #exampleTableTableSort='matSort' id="ExampleTable" mat-table matTableExporter [dataSource]="dataSource" matSort class="mat-elevation-z8">
如果你有*ngIf
下的数据Angular无法达到所以我建议给Angular喘口气(附上dataSource.paginator和this.dataSource.sort 在 setTimeout
this.Service.getContent().then(results => {
this.datastructure = results;
this.loadingData = false;
setTimeout(()=>{
this.dataSource.paginator = this.paginator;
this.dataSource.sort = this.sort;
})
})
无论如何,material Angular 为您排序数据,我无法理解您的函数 sort 和您的变量 sortedData。您只需要 datasource.data 等于 API
的响应