angular - ng2-smart-table with paging from back-end (Spring)

Angular - ng2-smart-table with paging from back-end (Spring)

To implement ng2-smart-table with server-side paging using Angular and Spring, you'll need to set up communication between your Angular frontend and Spring backend to fetch paginated data. Here's a step-by-step guide on how to achieve this:

Backend (Spring Boot):

  1. Controller Endpoint: Create an endpoint in your Spring Boot application to handle paginated requests.
@RestController @RequestMapping("/api/data") public class DataController { @Autowired private DataService dataService; @GetMapping("/paged") public ResponseEntity<Page<Data>> getPagedData(@RequestParam int pageNumber, @RequestParam int pageSize) { Page<Data> dataPage = dataService.getPagedData(pageNumber, pageSize); return ResponseEntity.ok(dataPage); } }
  1. Service Layer: Implement a service to fetch paged data from your database.
@Service public class DataService { @Autowired private DataRepository dataRepository; public Page<Data> getPagedData(int pageNumber, int pageSize) { Pageable pageable = PageRequest.of(pageNumber, pageSize); return dataRepository.findAll(pageable); } }

Frontend (Angular):

  1. Install ng2-smart-table: If you haven't already, install ng2-smart-table in your Angular project.
npm install ng2-smart-table --save
  1. Create Smart Table Component: Create a component where you'll use ng2-smart-table to display paginated data.
import { Component, OnInit } from '@angular/core'; import { LocalDataSource } from 'ng2-smart-table'; import { HttpClient } from '@angular/common/http'; @Component({ selector: 'app-smart-table', templateUrl: './smart-table.component.html', styleUrls: ['./smart-table.component.css'] }) export class SmartTableComponent implements OnInit { settings = { columns: { id: { title: 'ID' }, name: { title: 'Name' }, // Define more columns here } }; source: LocalDataSource = new LocalDataSource(); constructor(private http: HttpClient) { } ngOnInit(): void { this.loadData(); } loadData(): void { const pageNumber = 1; // Specify page number const pageSize = 10; // Specify page size this.http.get<any>(`/api/data/paged?pageNumber=${pageNumber}&pageSize=${pageSize}`).subscribe(data => { this.source.load(data.content); // Assuming data.content contains the array of items }); } }
  1. Use Smart Table in Template: Use ng2-smart-table in your template to display the data.
<ng2-smart-table [settings]="settings" [source]="source"></ng2-smart-table>
  1. Styling: Apply custom styles to the table as needed.

With these steps, you'll have ng2-smart-table integrated with server-side paging in your Angular application. Make sure to adjust the code according to your specific data model and requirements.

Examples

  1. How to implement server-side paging with ng2-smart-table and Spring back-end?

    • Implement server-side paging by fetching paginated data from a Spring REST API and integrating it with ng2-smart-table.
    import { HttpClient } from '@angular/common/http'; import { LocalDataSource } from 'ng2-smart-table'; @Component({ selector: 'app-my-table', template: `<ng2-smart-table [settings]="tableSettings" [source]="tableSource"></ng2-smart-table>`, }) export class MyTableComponent implements OnInit { tableSource = new LocalDataSource(); // Data source for the smart table constructor(private http: HttpClient) {} ngOnInit() { this.loadTableData(0, 10); // Load initial data with pagination } loadTableData(page: number, size: number) { this.http .get(`http://my-backend.com/api/data?page=${page}&size=${size}`) .subscribe((data: any) => { this.tableSource.load(data.content); // Load data into the smart table }); } }

  2. How to handle pagination events in ng2-smart-table with Angular?

    • Listen for pagination events and fetch data from the back-end as needed.
    import { LocalDataSource } from 'ng2-smart-table'; @Component({ selector: 'app-my-table', template: `<ng2-smart-table [settings]="tableSettings" [source]="tableSource" (pageChange)="onPageChange($event)"></ng2-smart-table>`, }) export class MyTableComponent { tableSource = new LocalDataSource(); // Data source for the smart table onPageChange(event: any) { const page = event.page - 1; // Adjusting to zero-based index const size = event.perPage; this.loadTableData(page, size); // Fetch data for the specified page } }

  3. How to configure Angular ng2-smart-table for server-side paging?

    • Configure ng2-smart-table with custom settings to enable server-side paging.
    import { Settings } from 'ng2-smart-table'; @Component({ selector: 'app-my-table', template: `<ng2-smart-table [settings]="tableSettings" [source]="tableSource"></ng2-smart-table>`, }) export class MyTableComponent { tableSettings: Settings = { pager: { display: true, // Display pagination controls perPage: 10, // Default number of items per page }, }; tableSource = new LocalDataSource(); }

  4. How to manage sorting with server-side pagination in ng2-smart-table?

    • To manage server-side sorting, include sorting parameters in the back-end requests.
    loadTableData(page: number, size: number, sortField: string = '', sortOrder: string = 'ASC') { this.http .get(`http://my-backend.com/api/data?page=${page}&size=${size}&sort=${sortField},${sortOrder}`) .subscribe((data: any) => { this.tableSource.load(data.content); // Load sorted data }); } onSortChange(event: any) { const sortField = event.sort[0].field; // Get the field to sort by const sortOrder = event.sort[0].direction.toUpperCase(); // 'ASC' or 'DESC' this.loadTableData(0, 10, sortField, sortOrder); // Reload with sorting }

  5. How to customize the ng2-smart-table pager for server-side paging?

    • Customize the pager to integrate with server-side paging requirements.
    tableSettings = { pager: { display: true, // Enable pagination perPage: 10, // Number of items per page pageStep: 5, // Step size for pagination displayPagesCount: 3, // Number of pages to display in the pager }, }; tableSource = new LocalDataSource(); // Data source for the smart table

  6. How to handle server-side filtering with ng2-smart-table in Angular?

    • Integrate server-side filtering by sending filter parameters to the Spring back-end.
    loadTableData(page: number, size: number, filter?: string) { let apiUrl = `http://my-backend.com/api/data?page=${page}&size=${size}`; if (filter) { apiUrl += `&filter=${filter}`; // Include the filter parameter } this.http.get(apiUrl).subscribe((data: any) => { this.tableSource.load(data.content); // Load filtered data }); } onFilterChange(event: any) { const filter = event.filter; // Get the filter value this.loadTableData(0, 10, filter); // Reload with the applied filter }

  7. How to create a dynamic data source for ng2-smart-table with server-side paging?

    • Implement a dynamic data source that adjusts to server-side pagination and filtering.
    tableSource = new LocalDataSource(); // Create the data source fetchData(page: number, size: number, sort?: string, filter?: string) { let apiUrl = `http://my-backend.com/api/data?page=${page}&size=${size}`; if (sort) { apiUrl += `&sort=${sort}`; // Include sort parameter } if (filter) { apiUrl += `&filter=${filter}`; // Include filter parameter } this.http.get(apiUrl).subscribe((data: any) => { this.tableSource.load(data.content); // Load dynamic data }); }

  8. How to handle server-side pagination and sorting in Angular ng2-smart-table?

    • Implement a function to handle pagination and sorting, integrating with the Spring back-end.
    onPageChange(event: any) { const page = event.page - 1; // Zero-based index const perPage = event.perPage; const sortField = event.sort ? event.sort[0].field : ''; const sortOrder = event.sort ? event.sort[0].direction.toUpperCase() : ''; this.fetchData(page, perPage, sortField, sortOrder); // Fetch data with pagination and sorting } <!-- ng2-smart-table with pagination and sorting event handling --> <ng2-smart-table [settings]="tableSettings" [source]="tableSource" (pageChange)="onPageChange($event)" (sortChange)="onSortChange($event)" ></ng2-smart-table>

  9. How to set default sort and filter options in ng2-smart-table with server-side pagination?

    • Set default sort and filter options, and ensure they are applied to server-side requests.
    tableSettings = { columns: { name: { title: 'Name', sortDirection: 'ASC' }, // Default sort }, filter: { name: { type: 'text', value: 'John' }, // Default filter }, }; onPageChange(event: any) { const page = event.page - 1; const perPage = event.perPage; const sortField = 'name'; const sortOrder = 'ASC'; const filter = 'John'; this.fetchData(page, perPage, sortField, sortOrder, filter); // Apply default sort and filter }

  10. How to ensure server-side data consistency with Angular ng2-smart-table?

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