Writing CasperJS modules

As of 1.1, CasperJS relies on PhantomJS' native require() function internally though it had to be patched in order to allow requiring casper modules using their full name, eg. require('casper').

So if you plan to write your own modules and uses casperjs' ones from them, be sure to call the patchRequire() function:

// my module, stored in universe.js
// patching phantomjs' require()
var require = patchRequire(require);

// now you're ready to go
var utils = require('utils');
var magic = 42;
exports.answer = function() {
    return utils.format("it's %d", magic);
};

From your root casper script:

var universe = require('./universe');
console.log(universe.answer()); // prints "It's 42"

First, install a module using npm_ : .. _npm: https://npmjs.org/

$ npm install underscore

Then, you can access it using require function:

//npm-underscore-test.js
var _ = require('underscore');
var casper = require('casper').create();
var urls = _.uniq([
  'http://google.com/',
  'http://docs.casperjs.org/',
  'http://google.com/'
]);

casper.start().eachThen(urls, function(response) {
  this.thenOpen(response.data, function(response) {
    this.echo(this.getTitle());
  });
});

casper.run();

Finaly, you’ll probably get something like this:

$ casperjs npm-underscore-test.js
Google
CasperJS documentation | CasperJS 1.1.0-DEV documentation