nprogress

What is nprogress?

The nprogress npm package is a lightweight JavaScript library for creating slim and beautiful progress bars. It is often used to indicate the progress of page loads or asynchronous operations. The library is highly customizable and easy to integrate into web projects.

What are nprogress's main functionalities?

Basic Progress Bar

This code demonstrates how to start and complete the progress bar. `NProgress.start()` initiates the progress bar at the top of the page, and `NProgress.done()` completes the progress and removes the bar.

NProgress.start();
// Some loading process goes here
NProgress.done();

Setting a Specific Progress

This code snippet shows how to set the progress bar to a specific percentage. The `NProgress.set()` function takes a decimal number between 0 and 1 to set the progress accordingly.

NProgress.set(0.4); // Sets the progress bar to 40%

Incremental Progress

This demonstrates how to incrementally increase the progress bar. The `NProgress.inc()` function increases the progress by a small, random amount. This is useful for indicating progress when the exact time to completion is unknown.

NProgress.inc(); // Increments the progress bar by a little

Configuration

This code snippet shows how to configure the behavior and appearance of the progress bar. In this example, the minimum size of the bar is set to 10%, and the spinner is disabled.

NProgress.configure({ minimum: 0.1, showSpinner: false });

Other packages similar to nprogress

pace-js

Pace is a similar package that automatically monitors your ajax requests, event loop lag, document ready state, and elements on your page to decide the progress. Compared to nprogress, Pace provides more automatic progress detection features but might be more intrusive in its default configuration.

topbar

Topbar is another lightweight library for creating a top progress bar. Similar to nprogress, it's easy to use and customize. However, Topbar focuses more on simplicity and has fewer configuration options compared to nprogress.

README

NProgress

Slim progress bars for Ajax'y applications. Inspired by Google, YouTube, and Medium.

Installation

Add nprogress.js and nprogress.css to your project.

<script src='nprogress.js'></script>
<link rel='stylesheet' href='nprogress.css'/>

NProgress is available via bower and npm and spm.

$ bower install --save nprogress
$ npm install --save nprogress

Basic usage

Simply call start() and done() to control the progress bar.

NProgress.start();
NProgress.done();

Using Turbolinks or similar? Ensure you're using Turbolinks 1.3.0+, and use this: (explained here)

$(document).on('page:fetch',   function() { NProgress.start(); });
$(document).on('page:change',  function() { NProgress.done(); });
$(document).on('page:restore', function() { NProgress.remove(); });

Ideas

• Add progress to your Ajax calls! Bind it to the jQuery ajaxStart and ajaxStop events.

• Make a fancy loading bar even without Turbolinks/Pjax! Bind it to $(document).ready and $(window).load.

Advanced usage

Percentages: To set a progress percentage, call .set(n), where n is a number between 0..1.

NProgress.set(0.0);     // Sorta same as .start()
NProgress.set(0.4);
NProgress.set(1.0);     // Sorta same as .done()

Incrementing: To increment the progress bar, just use .inc(). This increments it with a random amount. This will never get to 100%: use it for every image load (or similar).

NProgress.inc();

If you want to increment by a specific value, you can pass that as a parameter:

NProgress.inc(0.2);    // This will get the current status value and adds 0.2 until status is 0.994

Force-done: By passing true to done(), it will show the progress bar even if it's not being shown. (The default behavior is that .done() will not do anything if .start() isn't called)

NProgress.done(true);

Get the status value: To get the status value, use .status

Configuration

minimum

Changes the minimum percentage used upon starting. (default: 0.08)

NProgress.configure({ minimum: 0.1 });

template

You can change the markup using template. To keep the progress bar working, keep an element with role='bar' in there. See the default template for reference.

NProgress.configure({
  template: "<div class='....'>...</div>"
});

easing and speed

Adjust animation settings using easing (a CSS easing string) and speed (in ms). (default: ease and 200)

NProgress.configure({ easing: 'ease', speed: 500 });

trickle

Turn off the automatic incrementing behavior by setting this to false. (default: true)

NProgress.configure({ trickle: false });

trickleRate and trickleSpeed

You can adjust the trickleRate (how much to increase per trickle) and trickleSpeed (how often to trickle, in ms).

NProgress.configure({ trickleRate: 0.02, trickleSpeed: 800 });

showSpinner

Turn off loading spinner by setting it to false. (default: true)

NProgress.configure({ showSpinner: false });

parent

specify this to change the parent container. (default: body)

NProgress.configure({ parent: '#container' });

Customization

Just edit nprogress.css to your liking. Tip: you probably only want to find and replace occurrences of #29d.

The included CSS file is pretty minimal... in fact, feel free to scrap it and make your own!

Resources

• New UI Pattern: Website Loading Bars (usabilitypost.com)

Support

Bugs and requests: submit them through the project's issues tracker.

Questions: ask them at StackOverflow with the tag nprogress.

Chat: join us at gitter.im.

Thanks

NProgress © 2013-2014, Rico Sta. Cruz. Released under the MIT License.
Authored and maintained by Rico Sta. Cruz with help from contributors.

ricostacruz.com  ·  GitHub @rstacruz  ·  Twitter @rstacruz