onConsoleMessage
Introduced: PhantomJS 1.2
This callback is invoked when there is a JavaScript console message on the web page. The callback may accept up to three arguments: the string for the message, the line number, and the source identifier.
By default, console messages from the web page are not displayed. Using this callback is a typical way to redirect it.
Note: line number and source identifier are not used yet, at least in phantomJS <= 1.8.1. You receive undefined values.
Examples
var webPage = require('webpage');
var page = webPage.create();
page.onConsoleMessage = function(msg, lineNum, sourceId) {
console.log('CONSOLE: ' + msg + ' (from line #' + lineNum + ' in "' + sourceId + '")');
};