如何在Angular 4中创建分页组件? [英] How can I create a pagination component in Angular 4?

问题描述

我有一个API端点，例如/list/students?page=5&rows=10，具有分页参数page和size.我想创建一个angular2分页组件.

I have a API endpoint like /list/students?page=5&rows=10 with a pagination parameters page and size. I want to create a angular2 pagination component.

输入参数将为

• 页面
• 大小

此外，我想使用箭头按钮转到特定的页面和尺寸.

In addition, I want to go to specific page and size with arrow buttons.

如何实现此组件?

推荐答案

您可以使用下面的代码和服务创建分页组件

You can crate a paging component using my below codes and services

app.component.html

app.component.html

<paging-component
  [TotalItems]="pagination.TotalItems"
  [CurrentPage]="pagination.CurrentPage"
  [PageSize]="pagination.PageSize"
  [TotalPageLinkButtons]="pagination.TotalPageLinkButtons"
  [RowsPerPageOptions]="pagination.RowsPerPageOptions"
  (onPageChange)="myChanges($event)"></paging-component>

app.component.ts在下面；

app.component.ts is below;

import {Component} from '@angular/core';

@Component({
  selector   : 'app-root',
  templateUrl: './app.component.html',
  styleUrls  : ['./app.component.css']
})
export class AppComponent {

  pagination = {
    TotalItems: 100,
    CurrentPage: 1,
    PageSize: 10,
    TotalPageLinkButtons: 5,
    RowsPerPageOptions: [10, 20, 30, 50, 100]
  };

  /* Paging Component metod */
  myChanges(event) {
    this.pagination.CurrentPage = event.currentPage;
    this.pagination.TotalItems = event.totalItems;
    this.pagination.PageSize = event.pageSize;
    this.pagination.TotalPageLinkButtons = event.totalPageLinkButtons;
  }
}

app.component.module

app.component.module

import {BrowserModule} from '@angular/platform-browser';
import {NgModule} from '@angular/core';
import {FormsModule} from '@angular/forms';
import {HttpModule} from '@angular/http';

import {AppComponent} from './app.component';
import {PagingComponent} from './components/paging-component/paging-component.component';
import {PagingService} from './service/paging-service.service';

@NgModule({
  declarations: [
    AppComponent,
    PagingComponent
  ],
  imports: [
    BrowserModule,
    FormsModule,
    HttpModule
  ],
  providers: [ PagingService],
  bootstrap: [AppComponent]
})
export class AppModule { }

paging-service.service.ts是

paging-service.service.ts is

import { Injectable } from '@angular/core';

@Injectable()
export class PagingService {


  /**
   * @param totalItems : Total items to be listed
   * @param currentPage : Current page number ( Pages starting from 1 not 0)
   * @param pageSize : The number of items in the page
   * @param totalPageLinkButtons : The number of total page link buttons
   * @returns {{
   * startPage: number,
   * endPage: number,
   * startIndex: number,
   * endIndex: number,
   * totalPageLinkButtons: number,
   * totalItems: number,
   * currentPage: number,
   * pageSize: number,
   * totalPages: number,
   * pages: (Observable<number>|any)
   * }}
   */
  getPagingServiceItems(totalItems: number, currentPage: number = 1, pageSize: number = 10, totalPageLinkButtons: number = 5) {

    totalItems = totalItems || 1;

    /* if currentPage not exists default value will be '1' */
    currentPage = currentPage || 1;

    /* The default value of the number of items in the page is 10 if not exist */
    pageSize = pageSize || 10;

    /* The default value of the number of total page link buttons is 10 if not exist */
    totalPageLinkButtons = totalPageLinkButtons || 10;

    /* calculate total pages  */
    const totalPages = Math.ceil(totalItems / pageSize);


    let startPage: number; // start Page Button number
    let endPage: number;   // end Page Button number

    if (totalPages <= totalPageLinkButtons) {

      // less than totalPageButtons then show all
      // 1,2,3,.., totalPages are buttons
      startPage = 1;
      endPage = totalPages;
    } else {
      // more than totalPageButtons then calculate start and end pages
      // currentPage will be on the center of the paging

      if (currentPage <= Math.ceil(totalPageLinkButtons / 2)) {
        startPage = 1;
        endPage = totalPageLinkButtons;
      } else if (currentPage + Math.ceil(totalPageLinkButtons / 2) > totalPages) {
        startPage = totalPages - totalPageLinkButtons + 1;
        endPage = totalPages;
      } else {
        startPage = currentPage - Math.ceil(totalPageLinkButtons / 2) + 1;
        endPage = startPage + totalPageLinkButtons - 1;
      }
    }

    // calculate start and end item indexes
    // Indexes are started from 0 ! It is important

    const startIndex = (currentPage - 1) * pageSize;
    const endIndex = Math.min(startIndex + pageSize - 1, totalItems - 1);

    const pages = [];
    // create an array of pages to ng-repeat in the pager control
    for ( let i = startPage; i <= endPage ; i++) {
      pages.push(i);
    }

    // return object with all paging properties required by the view
    return {
      startPage           : startPage,
      endPage             : endPage,
      startIndex          : startIndex,
      endIndex            : endIndex,
      totalPageLinkButtons: totalPageLinkButtons,
      totalItems          : totalItems,
      currentPage         : currentPage,
      pageSize            : pageSize,
      totalPages          : totalPages,
      pages               : pages
    };
  }


}

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