ng2-paginate

Angular2 Pagination

This is a port of my angular-utils-pagination module from Angular 1.x to Angular 2. Due to fundamental differences in the design of Angular2, the API is different but the idea is the same - the most simple possible way to add full-featured pagination to an Angular app.

Demo

Check out the live demo here: http://michaelbromley.github.io/ng2-pagination/

Play with it on Plunker here: http://plnkr.co/edit/JVQMPvV8z2brCIzdG3N4?p=preview

Quick Start

npm install ng2-pagination --save

Angular 2 Version

Angular 2 is not yet stable, and API changes are ongoing. Therefore, if encountering errors using this lib, ensure your version of Angular is compatible. The current version used to develop this lib is angular2 2.0.0-rc.4 +. If you need to support a previous version of Angular 2 for now, please see the changelog for advice on which version to use.

CommonJS

ng2-pagination ships as un-bundled CommonJS modules (located in the dist folder), which can be imported with require('ng2-pagination');, or import for those environments that support this method (e.g. TypeScript 1.6+).

System.register

ng2-pagination also ships with a bundle in the system format (dist/ng2-pagination-bundle.js), suitable for use with the es6-module-loader and related loaders such as SystemJS. See the demo Plunker for an example of this.

Simple Example

import {Component} from '@angular/core';
import {PaginatePipe, PaginationControlsCmp, PaginationService} from 'ng2-pagination';
 
@Component({
    selector: 'my-component',
    template: `
    <ul>
      <li *ngFor="let item of collection | paginate: { itemsPerPage: 10, currentPage: p }"> ... </li>
    </ul>
               
    <pagination-controls (pageChange)="p = $event"></pagination-controls>
    `,
    directives: [PaginationControlsCmp],
    pipes: [PaginatePipe],
    providers: [PaginationService]
})
export class MyComponent {
 
    public collection: any[] = someArrayOfThings;  
 
}

API

PaginatePipe

The PaginatePipe should be placed at the end of an NgFor expression. It accepts a single argument, an object conforming to the IPaginationInstance interface. The following config options are available:

<element *ngFor="let item of collection | paginate: { id: 'foo'
                                                   itemsPerPage: pageSize
                                                   currentPage: p
                                                   totalItems: total }">...</element>
 

• itemsPerPage [number] - required The number of items to display on each page.
• currentPage [number] - required The current (active) page number.
• id [string] If you need to support more than one instance of pagination at a time, set the id and ensure it matches the id set in the PaginatePipe config (see below).
• totalItems [number] The total number of items in the collection. Only useful when doing server-side paging, where the collection size is limited to a single page returned by the server API. For in-memory paging, this property should not be set, as it will be automatically set to the value of collection.length.

PaginationControlsCmp

<pagination-controls  id="some_id"
                      (pageChange)="pageChanged($event)"
                      maxSize="9"
                      directionLinks="true"
                      autoHide="true">
</pagination-controls>

• id [string] If you need to support more than one instance of pagination at a time, set the id and ensure it matches the id set in the PaginatePipe config.
• pageChange [event handler] The expression specified will be invoked whenever the page changes via a click on one of the pagination controls. The $event argument will be the number of the new page. This should be used to update the value of the currentPage variable which was passed to the PaginatePipe.
• maxSize [number] Defines the maximum number of page links to display. Default is 7.
• directionLinks [boolean] If set to false, the "previous" and "next" links will not be displayed. Default is true.
• autoHide [boolean] If set to true, the pagination controls will not be displayed when all items in the collection fit onto the first page. Default is false.

Server-Side Paging

In many cases - for example when working with very large data-sets - we do not want to work with the full collection in memory, and use some kind of server-side paging, where the server sends just a single page at a time.

This scenario is supported by ng2-pagination by using the totalItems config option.

Given a server response json object like this:

{
  "count": 14453,
  "data": [
    { /* item 1 */ },
    { /* item 2 */ },
    { /* item 3 */ },
    { /*   ...  */ },
    { /* item 10 */ }
  ]
}

we should pass the value of count to the PaginatePipe as the totalItems argument:

<li *ngFor="let item of collection | paginate: { itemsPerPage: 10, currentPage: p, totalItems: res.count }">...</li>

This will allow the correct number of page links to be calculated. To see a complete example of this (including using the async pipe), see the demo.

Custom Templates

The PaginationControlsCmp component has a built-in default template and styles based on the Foundation 6 pagination component.

To use a custom template, just place your markup inside the <pagination-controls></pagination-controls> tags, and make a template variable reference with # to gain access to the API.

<pagination-controls #pagination (pageChange)="currentPage = $event">
 
    <div class="custom-pagination">
 
        <div class="pagination-previous" [class.disabled]="pagination.isFirstPage()">
            <a *ngIf="!pagination.isFirstPage()" (click)="pagination.previous()"> < </a>
        </div>
 
        <div *ngFor="let page of pagination.pages" [class.current]="pagination.getCurrent() === page.value">
            <a (click)="pagination.setCurrent(page.value)" *ngIf="pagination.getCurrent() !== page.value">
                <span>{{ page.label }}</span>
            </a>
            <div *ngIf="pagination.getCurrent() === page.value">
                <span>{{ page.label }}</span>
            </div>
        </div>
 
        <div class="pagination-next" [class.disabled]="pagination.isLastPage()" *ngIf="pagination.directionLinks">
            <a *ngIf="!pagination.isLastPage()" (click)="pagination.next()"> > </a>
        </div>
 
    </div>
    
</pagination-controls>

The key thing to note here is #pagination - this provides a local variable, pagination, which can be used in the template to access the class' API methods and properties, which are explained below:

• pages [{ label: string, value: any }[]] Array of page objects containing the page number and label.
• directionLinks [boolean] Corresponds to the value of directionLinks which is passed to the directive.
• autoHide [boolean] Corresponds to the value of autoHide which is passed to the directive.
• maxSize [number] Corresponds to the value of maxSize which is passed to the directive.
• getCurrent() [() => number] Returns the current page number.
• setCurrent(val) [(val: number) => void] Triggers the pageChange event with the page number passed as val.
• previous() [() => void] Sets current page to previous, triggering the pageChange event.
• next() [() => void] Sets current page to next, triggering the pageChange event.
• isFirstPage() [() => boolean] Returns true if the current page is the first page.
• isLastPage() [() => boolean] Returns true if the current page is the last page/

Build

Requires globally-installed node (tested with v5.x) & npm.

npm install
npm run typings:install

npm run test // Karma unit tests
npm run demo:watch // Build the demo app and watch

Dart Version

For Dart users, there is a Dart port available here: https://github.com/laagland/ng2-dart-pagination. Note that this version was written and is maintained by a different author and may not be up-to-date with this repo.

License

MIT