Awesome

AWC Router

Features

Web Component
Code splitting/lazy loading
Declarative routing
Nested routing
Named/auxiliary routing and outlets
Path params
Guards
Works with regular anchor tags for links
Automatically styling active links
Zero dependencies

Examples

Examples and further documentation can be found in the examples folder and are hosted here

To run the examples locally run:

node exampleServer.js

Then enter this url in the browser:

http://localhost:3000/a-wc-router/examples/router/

Install

npm i a-wc-router

Usage

With HTML

<!DOCTYPE html>
<html>
    <head>
        <base href="/app/">
        <script type="module" src="/node_modules/a-wc-router/build/es6-bundled/src/router.js"></script>
        OR use a CDN
        <script type="module" src="https://unpkg.com/a-wc-router/src/router.js"></script>
        <script type="module" src="https://cdn.jsdelivr.net/npm/a-wc-router/src/router.js"></script>
        
        <script type="module" src="/src/my-page1.js"></script>
    </head>
    <body>
        <a is="router-link" href="/app/page1">Page 1</a>
        <a is="router-link" href="/app/page2">Page 2</a>
        <a-router  style="display: block;">
            <a-outlet>This content never shows because of the last catch all route</a-outlet>
            <a-route path="/page1" element="my-page1"></a-route>
            <a-route path="/page2" element="my-page2" import="/src/my-page2.js"></a-route>
            <a-route path="*"><template>Page not found</template></a-route>
        </a-router>
    </body>
</html>

With Custom Element

import '../node_modules/a-wc-router/build/es6-bundled/src/router.js';
// Or use a CDN
import 'https://unpkg.com/a-wc-router/src/router.js';
import 'https://cdn.jsdelivr.net/npm/a-wc-router/src/router.js';

import './my-page1.js';

class MyApp extends HTMLElement {
    connectedCallback() {
        if (this.isConnected) {
            this.innerHTML =   `
                <a is="router-link" href="/app/page1">Page 1</a>
                <a is="router-link" href="/app/page2">Page 2</a>
                <a-router  style="display: block;">
                    <a-outlet>This content never shows because of the last catch all route</a-outlet>
                    <a-route path="/page1" element="my-page1"></a-route>
                    <a-route path="/page2" element="my-page2" import="/src/my-page2.js"></a-route>
                    <a-route path="*"><template>Page not found</template></a-route>
                </a-router>
            `;
        }
    }
}

customElements.define('my-app', MyApp);

Routing

Routing using a router, outlet, routes and HTML anchors

<a-router>
    <a-outlet>Please click a link</a-outlet>
    <a-route path="/user" import="./userBundle.js" element="user-main"></a-route>
    <a-route path="/item" import="./itemsBundle.js" element="item-main"></a-route>
    <a-route path="/template"><template>Hello Template</template></a-route>
    <a-route path="*"><template></template></a-route>
<a-router>
....
<a href='user'>click for user-main custom element</a>
<a href='item'>click for item-main custom element</a>

Passing data to routes

<a-route path="/user1/:requiredParam" element="user-main"></a-route>
<a-route path="/user2/:optionalParam?" element="user-main"></a-route>
<a-route path="/user2/:optionalParam?defaultValue" element="user-main"></a-route>
<a-route path="/user3/:atLeastOneParam+" element="user-main"></a-route>
<a-route path="/user4/:anyNumOfParam*" element="user-main"></a-route>
<a-route path="/user5/:firstParam/:secondParam" element="user-main"></a-route>
<!-- use a '.' as first char to set data as a property of the element instead of  an attribute -->
<a-route path="/user5/:.dataAsPropertyInsteadOfAttribute" element="user-main"></a-route>

<!-- constant params via attributes -->
<a-route path="/user6" data-firstParam="valueA" data-secondParam="valueB" element="user-main">
    <!-- This create <user-main firstParam="valueA" secondParam="valueB"> but will be overridden by values in the route -->
</a-route>
<script>
    // Constant params via set properties
    const myRoute = document.querySelector('a-route');
    // Set constant param programmatically
    myRoute.firstParam = 'valueA';
    myRoute.secondParam = new Date();
    // This will set the firstParam and secondParam as properties on the route content
</script>

<a href="user1/12">click for user with required param</a>
<a href="user2">click for user with optional param</a>
<a href="user3/12/tom">click for user with at least one param</a>
<a href="user4/12/tom">click for user any number of params</a>
<a href="user5/12/tom">click for user with two named params</a>

Code splitting and eager loading modules for routes

<a-route path="/user" import="/path-to/user-main.js" element="user-main"></a-route>

Code splitting and lazy loading modules for routes

<a-route path="/user" import="/path-to/user-main.js" lazy-load element="user-main"></a-route>

Nested Routing

<a-router>
    <a-outlet></a-outlet>
    <a-route path="/user" import="./userBundle.js" element="user-main"></a-route>
    <a-route path="/item" import="./itemsBundle.js" element="item-main"></a-route>
    <a-route path="*"><template></template></a-route>
<a-router>

// Code snippet from user-main with nested routing
connectedCallback() {
    if (this.connected && !this.innerHTML) {
        this.innerHTML = `
            <a-router>
                <a-outlet></a-outlet>
                <a-route path="/details" element="user-details"></a-route>
                <a-route path="/edit" element="user-edit"></a-route>
            </a-route>
            `;
    }
}
....
<a href='/user/details'>Navigate to the nested route</a>

Base URL

Routing only takes place if a url also matches the document.baseURI.

<base href="/MyAppRoot/">

<a href='/user'>Wont route</a>
<a href='/MyAppRoot/user'>Will route</a>

Named outlets (no router or routes required)

Routing using named outlets and HTML anchors

<a-outlet name="main">Please click a link</a-outlet>
....
<a href="/(main:user-main)">Assign <user-main> element to outlet main</a>
<a href="/(main:item-main)">Assign <item-main> element to outlet</a>

Passing data to named outlets

<a-outlet name="main">Please click a link</a-outlet>
....
<a href="/(main:user-main:userId=2&userName=tom)">Assign <user-main userId="2" userName="tom"> to outlet</a>

Code splitting and eager loading modules for named outlets

<a-outlet name="main">Please click a link</a-outlet>
....
<a class="item" is="router-link" href="(main:user-main(/path-to/user-main.js))">Load <user-main> from /path-to/user-main.js</a>
<a class="item" is="router-link" href="(main:/path-to/user-main)">Load <user-main> from /path-to/user-main.js</a>

General to Routing and Named Outlets

Styling link matching the active routes

<style>
    a.active {
        color: red;
    }
</style>

<a class="item" href="/user/123">Regular anchor - will route but wont get active status styling</a>
<a is="router-link" class="item" href="/user/123">Router link - will route and get active status styling</a>

Navigating using HTML anchors

<a class="item" href="/user/123">Regular anchor - will route but wont get active status styling</a>
<a is="router-link" class="item" href="/user/123">outer link - will route and get active status styling</a>

Navigating using events

window.dispatchEvent(
    new CustomEvent(
        'navigate', {
            detail: {
                href: '/(user/123' }}));

Navigating using RouterElement

RouterElement.navigate('myUrl');
RouterElement.navigate('/user/123');

Guards

window.addEventListener('onRouteLeave', guard);

guard(event) {
    if (document.getElementById('guard').checked) {
        // preventDefault to prevent the navigation
        event.preventDefault();
    }
}

Lifecycle Events

onRouterAdded

onRouteMatch

onRouteLeave

onRouteNotHandled

onRouteCancelled

onLinkActiveStatusUpdated

onOutletUpdated

Testing

To run tests:

npm test