x-ray-nightmare v0.1.3

x-ray-nightmare

Nightmare (electron based) driver for the x-ray web scraper.

This is an alternative to the x-ray-phantom driver created by x-ray author @matthewmueller.

Installation

npm install x-ray-nightmare

Usage

var NightmareElectron = require('x-ray-nightmare');
var Xray = require('x-ray');

// instantiate driver for later shutdown
var nightmareDriver = NightmareElectron();

var x = Xray()
  .driver(nightmareDriver);

x('http://google.com', 'title')(function(err, str) {
  if (err) return done(err);
  assert.equal('Google', str);
  
  // gracefully shutdown driver
  nightmareDriver();
  
  done();
})

API

NightmareElectron(options|fn, fn)

Initialize the NightmareElectron driver with options being passed to Nightmare and an optional custom fn with the signature function(ctx,nightmare).

Returns the driver object which must be called as a function once when no longer needed in order to gracefully shut down the nightmare object (results in a call to the Nightmare .end() function)

Options

Options that can be passed to nightmare are documented here.

Optional function

By default, a simple page visit by using Nightmare to the URL specified is executed

// Assume that a nightmare object is instantiated with
// options as (if) specified
// var Nightmare = require('nightmare');
// var nightmare = new Nightmare(options);

nightmare.goto(ctx.url);

A custom function to, lets say, take a screenshot and save the file, would replace this simple Nightmare call with this:

// take a screenshot before passing output to x-ray
function getScreenshot(ctx, nightmare) {
    nightmare.goto(ctx.url)
       .screenshot('page.png');
}

// alternate instantiation of x
var x = Xray()
  .driver(NightmareElectron(getScreenshot));

Note that the page html is passed off to x-ray and nightmare.end() is executed by the driver, so there is no need to add this to your custom function.

Test

npm install 
npm install -only=dev

#run mocha on test.js file

Debug Flags

All x-ray-nightmare messages:

DEBUG=x-ray:nightmare*

License

MIT