console.log doesn't work in CasperJS' evaluate with setTimeout

Question

Why when I use console.log in evaluate, it works:

casper.then(function() {   this.evaluate( function() {     console.log('hello');    }); }); 

But this doesn't work:

casper.then(function() {   this.evaluate( function() {     setTimeout( function() {console.log('hello');}, 1000);   }); }); 

Answer 1

Because you're mixing up casperjs and remote page environments. The evaluate function will execute code within the remote page env, so the console.log call won't output anything.

If you want to catch remote console.log calls, listen to the remote.message event:

casper.on('remote.message', function(msg) {     this.echo('remote message caught: ' + msg); }) 

Btw, documentation for events is pretty much exhaustive, as well as the one for evaluate.

Answer 2

@NiKo's answer is critical.

I would also suggest adding the following, since if there's an error, you might not even make it far enough to print out a console.log() msg, and instead end up with silence.

casper.on( 'page.error', function (msg, trace) {     this.echo( 'Error: ' + msg, 'ERROR' ); });