帮我解释以下代码 this.purshaseDemandService.createByItemIds(purchaseDemands).subscribe(() =>
时间: 2024-06-04 19:06:32 浏览: 3
这段代码是在调用一个 `purshaseDemandService` 对象的 `createByItemIds` 方法,并将 `purchaseDemands` 作为参数传递给该方法。在该方法执行完成后,会返回一个 Observable 对象,调用该对象的 `subscribe` 方法以监听该方法的执行结果。当该方法执行成功时,会调用 `subscribe` 方法中的回调函数,这里是一个空函数。如果该方法执行失败,则会调用 `subscribe` 方法中的错误回调函数。
相关问题
帮我优化一下这个angular 代码 this.translate.store.onLangChange.subscribe( (lang: LangChangeEvent) => { const self = this;
可以尝试使用箭头函数简化代码:
```
this.translate.store.onLangChange.subscribe((lang: LangChangeEvent) => {
// 直接使用 this,不需要引入 self
// TODO: 处理语言变更逻辑
});
```
此外,如果在组件销毁时需要取消订阅,可以将订阅对象保存在组件中,然后在 `ngOnDestroy` 钩子中取消订阅,避免内存泄漏:
```
private langChangeSubscription: Subscription;
ngOnInit() {
this.langChangeSubscription = this.translate.store.onLangChange.subscribe((lang: LangChangeEvent) => {
// TODO: 处理语言变更逻辑
});
}
ngOnDestroy() {
if (this.langChangeSubscription) {
this.langChangeSubscription.unsubscribe();
}
}
```
以下三个方法已经取出了我想要的对应的数据现在想要对这些数据分别进行分页处理我应该怎么修改代码 loadAll(): void { this.approvalRecordService.queryAuditing().subscribe((res: HttpResponse<IApprovalRecord[]>) => { this.auditingApprovalRecords = res.body ?? []; }); this.approvalRecordService.queryCreated().subscribe((res: HttpResponse<IApprovalRecord[]>) => { this.createdApprovalRecords = res.body ?? []; }); this.approvalRecordService.queryAudited().subscribe((res: HttpResponse<IApprovalRecord[]>) => { this.auditedApprovalRecords = res.body ?? []; }); }
你可以使用 Angular Material 提供的 `MatPaginator` 组件来实现分页。具体实现步骤如下:
1. 在组件的 HTML 模板中,添加 `MatPaginator` 组件。例如:
```html
<mat-paginator [length]="auditingApprovalRecords.length" [pageSize]="pageSize" [pageSizeOptions]="pageSizeOptions" (page)="onAuditingPageChange($event)">
</mat-paginator>
```
其中,`length` 表示数据总数,`pageSize` 表示每页显示的数据条数,`pageSizeOptions` 表示用户可选的每页数据条数选项,`page` 事件表示当用户点击页码时的回调函数。
2. 在组件的 TypeScript 文件中,定义相应的属性和方法。例如:
```typescript
import { Component, OnInit, ViewChild } from '@angular/core';
import { MatPaginator } from '@angular/material/paginator';
import { IApprovalRecord } from 'app/shared/model/approval-record.model';
import { ApprovalRecordService } from 'app/entities/approval-record/approval-record.service';
@Component({
selector: 'jhi-approval-record',
templateUrl: './approval-record.component.html',
})
export class ApprovalRecordComponent implements OnInit {
@ViewChild(MatPaginator) paginator!: MatPaginator;
auditingApprovalRecords: IApprovalRecord[] = [];
createdApprovalRecords: IApprovalRecord[] = [];
auditedApprovalRecords: IApprovalRecord[] = [];
pageSize = 10;
pageSizeOptions: number[] = [5, 10, 20];
constructor(private approvalRecordService: ApprovalRecordService) {}
ngOnInit(): void {
this.loadAll();
}
loadAll(): void {
this.approvalRecordService.queryAuditing().subscribe((res: HttpResponse<IApprovalRecord[]>) => {
this.auditingApprovalRecords = res.body ?? [];
this.auditingApprovalRecords.paginator = this.paginator; // 绑定分页组件
});
this.approvalRecordService.queryCreated().subscribe((res: HttpResponse<IApprovalRecord[]>) => {
this.createdApprovalRecords = res.body ?? [];
this.createdApprovalRecords.paginator = this.paginator; // 绑定分页组件
});
this.approvalRecordService.queryAudited().subscribe((res: HttpResponse<IApprovalRecord[]>) => {
this.auditedApprovalRecords = res.body ?? [];
this.auditedApprovalRecords.paginator = this.paginator; // 绑定分页组件
});
}
onAuditingPageChange(event: any): void {
this.auditingApprovalRecords.paginator = this.paginator;
}
onCreatedPageChange(event: any): void {
this.createdApprovalRecords.paginator = this.paginator;
}
onAuditedPageChange(event: any): void {
this.auditedApprovalRecords.paginator = this.paginator;
}
}
```
其中,`@ViewChild(MatPaginator) paginator!: MatPaginator` 表示获取 `MatPaginator` 组件的实例。在 `loadAll()` 方法中,将获取到的数据绑定到 `MatPaginator` 组件上。分别定义了三个回调函数 `onAuditingPageChange`、`onCreatedPageChange` 和 `onAuditedPageChange`,用来处理分页变化事件。
注意:在绑定分页组件时,需要先将获取到的数据赋值给对应的属性,再将属性绑定到分页组件上。
相关推荐
![pdf](https://img-home.csdnimg.cn/images/20210720083512.png)
![pdf](https://img-home.csdnimg.cn/images/20210720083512.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![zip](https://img-home.csdnimg.cn/images/20210720083736.png)