An ES6 client-side router
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ES6 Client-side Router

A client-side router written as an ES6 module


npm install es6-client-side-router

# Yarn
yarn add es6-client-side-router

Getting Started

import Router from 'es6-client-side-router';

let router = new Router();

router.on('/hello', (ctx) => {
  console.log('hello world');


API Reference


Create an instance of the Router class.

import Router from 'es6-client-side-router';

let router = new Router();


router.on(path, callback)

The following table describes the arguments required by the on method.

Argument Description Type
path A URL path/pattern to match String
callback The function to execute when the path is matched Function


router.on('/widgets', (ctx) => {
  // fetch all widgets
path parsing

The path parameter is converted to a REGEX internally using path-to-regexp.

When a path is matched:

  • The URL path is parsed using the internally stored REGEX
  • The parsed parameters are converted to an Object
  • The params Object is made available via ctx.params

This allows for:

router.on('/widgets/:widgetId', (ctx) => {
Callback function

Callback functions are invoked with one argument ctx.

The following table describes the properties of the ctx argument.

Property Description Type
ctx.params URL parameter key/values Object
ctx.url Instance of the URL class URL instance
Accessing query string values

A URLs query string can be accessed through the URL class instance.

View documentation: MDN URL Search Params


router.on('/widget/:widgetId', (ctx) => {
  ctx.url.href; //
  ctx.url.searchParams.toString(); // type=tabby&color=gray

Handling 'no-match' routes

We use the term 'no-match' to mean when a user navigates to a route that does not have a defined handler.

When a 'no-match' occurs a default callback is invoked. The default callback will log the occurrence to the console.

The default callback can be overwritten by the following:

router.on('router-no-match', (ctx) => {
  console.log('No route matched');


Start listening and intercepting navigation actions.

When router.enable() is called it will check the current URL and attempt to match/invoke the assigned callback.


Stop listening and intercepting navigation actions.

Disabling route handling on specific Links

Route handling can be disabled on a per link basis by adding the attribute data-router-ignore to the anchor element.

<a href="/" data-router-ignore>Router will ignore handling this click</a>

Note this attribute is handled as a boolean. The value set does not matter. If it's present it will be considered true.

Design Decisions

A client-side routers primary responsbility is to:

  • Intercept navigation actions
  • Provide a hook to complete an alternative action

What is a navigation action?

This library defines a navigation action is:

  • A click on an anchor element
  • Manipulation of browser history controls (Back, Forward button)

Clicks on anchor elements are filtered down by the following criteria:

  • Click is not modified (Control + click)
  • Click is a left click
  • Anchor does not contain "target" attribute
  • Anchor does not contain "download" attribute
  • Anchor does not contain "data-router-ignore" attribute
  • Anchor contains a "href" attribute
  • Anchor HREF is not to a different domain
  • Anchor HREF is not to an email address (mailto: link)

URL bar changes

URL changes in the URL bar trigger a popstate event. We catch this event and run the URL against the registered routes.


Coming soon..