CasperJs do something before start?

Question

I use JWTs to manage logged-in status, so I need to clear localstorage before running casper.start. How is this possible?

Something like:

casper.then(function() {
  casper.evaluate(function() {
    localStorage.clear()
  })
})

casper.start('http://localhost:3000', function() {
  test.assertUrlMatch('http://localhost:3000')
})

score 1 · Answer 1 · edited May 23 '17 at 11:59

You can call casper.start without any arguments to initialize the internal data and then do your stuff:

casper.start()
    .then(function() {
      casper.evaluate(function() {
        localStorage.clear()
      })
    })
    .thenOpen('http://localhost:3000', function() {
      test.assertUrlMatch('http://localhost:3000')
    })

The problem is that if you call casper.start without any URL, the page will stay on about:blank when you're trying to clear localStorage. There are basically two solutions:

Use the fs module of PhantomJS to delete the localStorage database that is in the temporary files directory for PhantomJS.

Open the target page, clear the localStorage, and open the target page again.

var url = "...";
casper.start(url, function() {
  this.evaluate(function() {
    localStorage.clear()
  })
})
.thenOpen(url, function() {
  test.assertUrlMatch('http://localhost:3000')
})

CasperJs do something before start?

1 Answers1