Javascript that implements client-side hyphenation of HTML-Documents.

jQuery plugin to register callback functions to keyboard shortkuts. Keyboard events in vanilla Javascripts are super-painful to work with, so hopefully this library can help.

Added utility methods for the Prototype Javascript framework.

Prototip allows you to easily create both simple and complex tooltips using the Prototype javascript framework.

Please note: "Permission to use Prototip on your domain is required and can be obtained by paying a small fee."

String manipulation extensions for the Underscore.js javascript library.

Flot is a pure Javascript plotting library for jQuery. It produces graphical plots of arbitrary datasets on-the-fly client-side.

Javascript sprite library for Canvas

The Holy Grail of testing for front-end development; execute browser-less, console-based, javascript + DOM code right from within your Rails test suite.

You can use this code:

function scrollToLine($textarea, lineNumber) {
  var lineHeight = parseInt($textarea.css('line-height'));
  $textarea.scrollTop(lineNumber * lineHeight);      
}

Some caveats about this code:

1. Your textarea needs to have a line-height in Pixels.
2. The code will scroll to the line number in the text area, not the line number of the original text. These will differ if any lines wrap at the edge of the textarea.

Also see our solution for [scrolling a textarea to a given position with jQuery](htt...

Spreewald gives you steps like these:

When I enter "text" into the browser dialog

Also see Accept or deny JavaScript confirmation dialogs in Capybara/Selenium.

Using the JS fullscreen API is painful because all browers use different methods and events and you need to use lots of boilerplate code to make your application work in all browsers.

The "screenfull" library wraps that for you, including events.

Examples

The linked GitHub repo contains some information. You basically use the library like this:

// Make an element go fullscreen
screenfull.request(element)

// Leave fullscreen
screenfull.exit()

...

This is non-trivial because you need to fake event objects and require different code for different browsers. Luckily, there is tool support for most types of events.

In jQuery you can say:

$('a#close_window').click();

In Prototype you can use event.simulate.js from the Protolicious library to say:

$$('a#close_window')[0].simulate('click');

To trigger custom events with Prototype, you can use the [built-in Element.fire()](http://api.prototypejs.org/dom/...

PhantomJS is a minimalistic headless WebKit.

It has fast and native support for various web standards:

DOM handling, CSS selector, JSON, Canvas, and SVG.

PhantomJS can be fully scripted using JavaScript. It is an optimal solution for headless testing of web-based applications, site scraping, pages capture, SVG renderer, PDF converter and many other usages.

When cucumber encounters a failing step in a @javascript feature, the selenium browser window instantly closes. Sometimes you do not want that, because you need to see what is going on. You can click through the data your feature created, when you add the following file to your features/support directory:

#features/support/examiners.rb

After('@leave_the_window_open') do |scenario|
  if scenario.respond_to?(:status) && scenario.status == :failed
    print "Step Failed. Press return to close browser"
    STDIN.getc
  ...

As web developers, we know how easy it is to end up with web page bloat. But loading a webpage is much more than shipping bytes down the wire. Once the browser has downloaded our page’s scripts it then has to parse, interpret & run them. In this post, we’ll dive into this phase for JavaScript, why it might be slowing down your app’s start-up & how you can fix it.

The article author also tested 6000+ production sites for load times. Apps became interactive in 8 seconds on desktop (using cable) and 16 seconds on mobile (Moto G4 over 3G).

When testing code that uses pushState / replaceState, your browser will appear to navigate away from http://localhost:3000/specs (or wherever you run your Jasmine tests). This is inconvenient, since reloading the document will no longer re-run the test suite.

To remedy this, copy the attached file to a place like spec/javascripts/helpers and #= require it from your tests. It will store the current location before every test and reset if afterwards (using location.replaceState).

traits.js is a minimal, standards-compliant trait composition library for Javascript.

Compress and obfuscate Javascript code online completely free using this compressor.

JSMin is a filter which removes comments and unnecessary whitespace from JavaScript files. It typically reduces filesize by half, resulting in faster downloads. It also encourages a more expressive programming style because it eliminates the download cost of clean, literate self-documentation.

Highslide JS is an open source image, media and gallery viewer written in JavaScript.

Grafico is a javascript charting library built with Raphaël and Prototype.js. The library provides a wide array of graphs and stays with the guidelines laid out by Stephen Few and Edward Tufte. Grafico provides pretty charts that effectively communicate their information.

A pure-JavaScript CSS selector engine