How to diagnores error "cannot read property 'implementation' of undefined"?

[corey kennedy]

Greetings all,

I've just started trying to use jsdom, but whenever I attempt to read in a document from a URL, an exception is thrown with the error "Cannot read property 'implementation' of undefined'.  I've pasted the stack trace and my source code below my message.

I've just built node, so I'm on v0.9.10-pre.  The package.json for jsdom indicates version '0.4.0'.

In the code below, I'm trying to scrape www.google.com.  I've also tried slashdot.org, to no avail.

Can anyone point in the right direction for resolving this?

-- Stack Trace --

TypeError: Cannot read property 'implementation' of undefined

    at processHTML (/home/nate/projects/scraper/node_modules/jsdom/lib/jsdom.js:178:59)

    at Request._callback (/home/nate/projects/scraper/node_modules/jsdom/lib/jsdom.js:283:9)

    at Request.self.callback (/home/nate/projects/scraper/node_modules/jsdom/node_modules/request/main.js:122:22)

    at Request.EventEmitter.emit (events.js:97:17)

    at Request.<anonymous> (/home/nate/projects/scraper/node_modules/jsdom/node_modules/request/main.js:661:16)

    at Request.EventEmitter.emit (events.js:124:20)

    at IncomingMessage.<anonymous> (/home/nate/projects/scraper/node_modules/jsdom/node_modules/request/main.js:623:14)

    at IncomingMessage.EventEmitter.emit (events.js:124:20)

    at _stream_readable.js:806:12

    at process._tickCallback (node.js:427:13)

-----------------------

Source code:

-----------------------

var jsdom = require('jsdom');

jsdom.env({

  html: 'http://www.google.com',

  done: function(errors, window) {

    if (errors) { console.log(errors); }

    else {

      console.log( window.name );

    }

  }

});

-------------------------------

[Domenic Denicola]

This is due to Contextify not being installed correctly. It is listed as an optionalDependency in package.json, but it’s really not—if it can’t install, you get this error with pretty much everything.

 

When you do the npm install, do you get any errors about the installation of contextify? Does this happen on a stable Node version (i.e. the 0.8 series)?

 

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[Brian McDaniel]

Contextify is broken on Node >= 0.9.6 right now, but I will be pushing a new release soon (tomorrow) to fix it.

Domenic - is there a reason not to go back to making Contextify a non-optional dependency?  It seems like having it be optional just causes confusion and trouble.

[corey kennedy]

I reverted to node v0.8.19 and it seems to be working now.  Thanks for the help!

[Domenic Denicola]

I agree that it should be non-optional. Eli, any disagreement? Maybe push out a 0.5 in the next week with that change.

[Elijah Insua]

Nope, this seems to be a pretty big deception on our part.  Along with making it a non-optional dependency, maybe we should also include some help in the readme regarding installing under windows (I'm assuming this is the major failure case)

-- Elijah