PW Page Loader

Javascript library to load pages using ajax and append the result in the current page, in order to create a infinite scrolling. It has the following features:

• Follows the progressive enhancement strategy: if javascript fails, the web page keeps working
• Accessible: After load the new page, the history url and title is changed. This allows to copy and share the url.
• High performance: Use the Intersection Observer API (and a polyfill) to track the page viewed currently.

Install

Requirements:

• NPM or Yarn to install the package and the dependencies
• Webpack (or any other javascript loader)

npm install pw-page-loader

Usage

HTML

Let's start with the following html code:

<ul class="images">
    <li><img src="http://placehold.it/500x300"></li>
    <li><img src="http://placehold.it/500x300"></li>
    <li><img src="http://placehold.it/500x300"></li>
    <li><img src="http://placehold.it/500x300"></li>
    <li><img src="http://placehold.it/500x300"></li>
    <li><img src="http://placehold.it/500x300"></li>
    <li><img src="http://placehold.it/500x300"></li>
    <li><img src="http://placehold.it/500x300"></li>
    <li><img src="http://placehold.it/500x300"></li>
    <li><img src="http://placehold.it/500x300"></li>
</ul>

<nav class="pagination">
    <a href="page2.html">Next Page</a>
</nav>

JS

Use javascript for a complete experience:

import PageLoader from 'pw-page-loader';

//Init the loader
const loader = new PageLoader('.images', '.pagination a');

//Enable auto-click
loader.autoClick(true);

API

constructor

Create a new instance of PageLoader. The arguments are:

• resultSelector A string with the css selector to the list of the result
• buttonSelector A string with the css selector to the link to the next page
• context Optional context for the selectors. The default value is document.

on

Register events in the page loader workflow. The available events are:

• beforeLoadPage Just before load a new page
• loadPage When a new page has been loaded
• changePage When the current page has changed

loader.on('beforeLoadPage', url => {
    console.log('Preparing to load page', url);
});

loader.on('loadPage', page => {
    console.log('New page loaded', page);
});

loader.on('changePage', page => {
    console.log('The current page is', page);
});

off

Unregister one or all callbacks of an event

//unregister one callback
loader.on('beforeLoadPage', callback1);

//unregister all callbacks
loader.on('beforeLoadPage');

Demo

To run the demo, just clone this repository enter in the directory and execute:

npm install
npm start

You should see something in http://localhost:8080/