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michaelbromley / ngx-pagination

Pagination for Angular
http://michaelbromley.github.io/ngx-pagination/
MIT License
1.21k stars 245 forks source link
angular pagination

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Pagination for Angular Build Status

The simplest solution for pagination in Angular.

Table of Contents

Demo

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

Play with it on StackBlitz here: https://stackblitz.com/edit/angular-e1f9hq

Quick Start

npm install ngx-pagination --save

Angular Version

This library is built to work with Angular 13+. If you need to support an earlier version of Angular, please use v5.x.

Simple Example

// app.module.ts
import {NgModule} from '@angular/core';
import {BrowserModule} from '@angular/platform-browser';
import {NgxPaginationModule} from 'ngx-pagination'; // <-- import the module
import {MyComponent} from './my.component';

@NgModule({
    imports: [BrowserModule, NgxPaginationModule], // <-- include it in your app module
    declarations: [MyComponent],
    bootstrap: [MyComponent]
})
export class MyAppModule {}
// my.component.ts
import {Component} from '@angular/core';

@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>
    `
})
export class MyComponent {
    p: number = 1;
    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 PaginationInstance interface. The following config options are available:

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

PaginationControlsComponent

This a default component for displaying pagination controls. It is implemented on top of the PaginationControlsDirective, and has a pre-set template and styles based on the Foundation 6 pagination component. If you require a more customised set of controls, you will need to use the PaginationControlsDirective and implement your own component.

<pagination-controls  id="some_id"
                      (pageChange)="pageChanged($event)"
                      (pageBoundsCorrection)="pageChanged($event)"
                      maxSize="9"
                      directionLinks="true"
                      autoHide="true"
                      responsive="true"
                      previousLabel="Previous"
                      nextLabel="Next"
                      screenReaderPaginationLabel="Pagination"
                      screenReaderPageLabel="page"
                      screenReaderCurrentLabel="You're on page">
</pagination-controls>

PaginationControlsDirective

The PaginationControlsDirective is used to build components for controlling your pagination instances. The directive selector is pagination-template, either as an element or an attribute. It exports an API named "paginationApi", which can then be used to build the controls component.

It has the following inputs and outputs:

@Input() id: string;
@Input() maxSize: number;
@Output() pageChange: EventEmitter<number>;
@Output() pageBoundsCorrection: EventEmitter<number>;

Here is an example of how it would be used to build a custom component:

<pagination-template #p="paginationApi"
                     (pageChange)="pageChange.emit($event)"
                     (pageBoundsCorrection)="pageBoundsCorrection.emit($event)">

        <div class="pagination-previous" [class.disabled]="p.isFirstPage()">
            <a *ngIf="!p.isFirstPage()" (click)="p.previous()"> < </a>
        </div>

        <div *ngFor="let page of p.pages" [class.current]="p.getCurrent() === page.value">
            <a (click)="p.setCurrent(page.value)" *ngIf="p.getCurrent() !== page.value">
                <span>{{ page.label }}</span>
            </a>
            <div *ngIf="p.getCurrent() === page.value">
                <span>{{ page.label }}</span>
            </div>
        </div>

        <div class="pagination-next" [class.disabled]="p.isLastPage()">
            <a *ngIf="!p.isLastPage()" (click)="p.next()"> > </a>
        </div>

</pagination-template>

The key thing to note here is #p="paginationApi" - this provides a local variable, p (name it however you like), which can be used in the template to access the directive's API methods and properties, which are explained below:

For a real-world implementation of a custom component, take a look at the source for the PaginationControlsComponent.

Styling

The PaginationControlsComponent can be styled by simply overriding the default styles. To overcome Angular's view encapsulation, you may need to use the ::ng-deep operator to target it (depending on the type of encapsulation your component is using).

To avoid specificity issues, just add your own custom class name to the element, which will allow your styles to override the defaults:

// head
<style>
  .my-pagination ::ng-deep .ngx-pagination .current {
    background: red;
  }
</style>

// body
<pagination-controls class="my-pagination"><pagination-controls>

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 ngx-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.

Multiple Instances

It is possible to have any number of pagination pipe/controls pairs in the same template. To do this, just make use of the "id" attribute:

<ul>
  <li *ngFor="let item of collection | paginate: { itemsPerPage: 10, currentPage: p1, id: 'first' }"> ... </li>
</ul>
<pagination-controls (pageChange)="p1 = $event" id="first"></pagination-controls>

<ul>
  <li *ngFor="let item of collection | paginate: { itemsPerPage: 10, currentPage: p2, id: 'second' }"> ... </li>
</ul>
<pagination-controls (pageChange)="p2 = $event" id="second"></pagination-controls>

You can even have dynamically-generated instances, e.g. within an ngFor block:

export class MyComponent {
  p: number[] = [];
}
<div *ngFor="let id of [1, 2]; let i = index;">
  <ul>
    <li *ngFor="let item of collection | paginate: { itemsPerPage: 10, currentPage: p[i], id: id }">{{ item }}</li>
   </ul>
   <pagination-controls (pageChange)="p[i] = $event" [id]="id"></pagination-controls>
</div>

FAQ

Why does my filter not work with pagination?

A common issue is that people have trouble combining some kind of filter pipe with the paginate pipe. The typical symptom is that only the contents of the current page are filtered. The reason is that the paginate pipe must come after the filter pipe:

<ul>
  <li *ngFor="let item of collection | paginate: config | filter: queryString">WRONG</li> <-- This will not work as expected
</ul>

<ul>
  <li *ngFor="let item of collection | filter: queryString | paginate: config">CORRECT</li>
</ul>

How do I use the ngFor index with the pagination pipe?

If you need to use the index of the *ngFor in combination with pagination pipe, the index should be declared after the pagination pipe:

<ul>
  <li *ngFor="let item of collection; let i = index | paginate: config">WRONG</li>
</ul>

<ul>
  <li *ngFor="let item of collection | paginate: config; let i = index">CORRECT</li>
</ul>

How do I get the absolute index of a list item?

Using the index variable exposed by ngFor will always give you the index of the items relative to the current page. For example, if you have 10 items per page, you might expect the first item on page 2 to have an index value of 10, whereas you will find the index value to be 0. This is because ngFor has no knowledge of the pagination, it only ever knows about the 10 items of the current page.

However, the absolute index can be calculated according to the following formula:

absoluteIndex(indexOnPage: number): number {
  return this.itemsPerPage * (this.currentPage - 1) + indexOnPage;
}

In a template this would look something like:

<ul>
  <li *ngFor="let item of collection | paginate: { currentPage: currentPage, itemsPerPage: itemsPerPage }; let i = index">
    {{ itemsPerPage * (currentPage - 1) + i }}
  </li>
</ul>

Building from source

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

npm install
npm run test
npm run build

After running npm run build, the final output of the lib (which gets published to npm) is in the /dist/ngx-pagination folder.

To build the docs, run npm run build:docs, or serve them in dev mode with npm run start.

License

MIT