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Error event handlers for PhantomJS and CasperJS: PhantomJS and CasperJS don't show errors on the page by default. This can give clues as to what did go wrong.
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var page = require('webpage').create(), | |
url = 'http://example.com/'; | |
// Put the event handlers somewhere in the code before the action of | |
// interest (opening the page in question or clicking something) | |
// http://phantomjs.org/api/webpage/handler/on-console-message.html | |
page.onConsoleMessage = function(msg, lineNum, sourceId) { | |
console.log('CONSOLE: ' + msg + ' (from line #' + lineNum + ' in "' + sourceId + '")'); | |
}; | |
// http://phantomjs.org/api/webpage/handler/on-error.html | |
page.onError = function(msg, trace) { | |
var msgStack = ['ERROR: ' + msg]; | |
if (trace && trace.length) { | |
msgStack.push('TRACE:'); | |
trace.forEach(function(t) { | |
msgStack.push(' -> ' + t.file + ': ' + t.line + (t.function ? ' (in function "' + t.function +'")' : '')); | |
}); | |
} | |
console.error(msgStack.join('\n')); | |
}; | |
// http://phantomjs.org/api/webpage/handler/on-resource-error.html | |
page.onResourceError = function(resourceError) { | |
console.log('Unable to load resource (#' + resourceError.id + ' URL:' + resourceError.url + ')'); | |
console.log('Error code: ' + resourceError.errorCode + '. Description: ' + resourceError.errorString); | |
}; | |
// http://phantomjs.org/api/webpage/handler/on-resource-timeout.html | |
page.onResourceTimeout = function(request) { | |
console.log('Response Timeout (#' + request.id + '): ' + JSON.stringify(request)); | |
}; | |
// use other helpful event handlers to debug the page behavior are: | |
// onNavigationRequested | |
// onResourceReceived | |
// onResourceRequested | |
// onUrlChanged | |
page.open(url, function(status) { | |
console.log('Status: ' + status); | |
phantom.exit(); | |
}); |
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var casper = require('casper').create({ | |
// these options only show some behavior of the page, but rarely any helpful errors | |
verbose: true, | |
logLevel: "debug" | |
}); | |
var url = 'http://example.com/'; | |
// http://docs.casperjs.org/en/latest/events-filters.html#remote-message | |
casper.on("remote.message", function(msg) { | |
this.echo("Console: " + msg); | |
}); | |
// http://docs.casperjs.org/en/latest/events-filters.html#page-error | |
casper.on("page.error", function(msg, trace) { | |
this.echo("Error: " + msg); | |
// maybe make it a little fancier with the code from the PhantomJS equivalent | |
}); | |
// http://docs.casperjs.org/en/latest/events-filters.html#resource-error | |
casper.on("resource.error", function(resourceError) { | |
this.echo("ResourceError: " + JSON.stringify(resourceError, undefined, 4)); | |
}); | |
// http://docs.casperjs.org/en/latest/events-filters.html#page-initialized | |
casper.on("page.initialized", function(page) { | |
// CasperJS doesn't provide `onResourceTimeout`, so it must be set through | |
// the PhantomJS means. This is only possible when the page is initialized | |
page.onResourceTimeout = function(request) { | |
console.log('Response Timeout (#' + request.id + '): ' + JSON.stringify(request)); | |
}; | |
}); | |
casper.start(url).run(); |
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var phantom = require('phantom'); | |
phantom.create(function (ph) { | |
ph.createPage(function (page) { | |
// Put the event handlers somewhere in the code before the action of | |
// interest (opening the page in question or clicking something) | |
// See https://github.com/sgentle/phantomjs-node#functionality-details for proper use of callbacks | |
// http://phantomjs.org/api/webpage/handler/on-console-message.html | |
page.set('onConsoleMessage', function(msg, lineNum, sourceId) { | |
console.log('CONSOLE: ' + msg + ' (from line #' + lineNum + ' in "' + sourceId + '")'); | |
}); | |
// http://phantomjs.org/api/webpage/handler/on-error.html | |
page.set('onError', function(msg, trace) { | |
var msgStack = ['ERROR: ' + msg]; | |
if (trace && trace.length) { | |
msgStack.push('TRACE:'); | |
trace.forEach(function(t) { | |
msgStack.push(' -> ' + t.file + ': ' + t.line + (t.function ? ' (in function "' + t.function +'")' : '')); | |
}); | |
} | |
console.error(msgStack.join('\n')); | |
}); | |
// http://phantomjs.org/api/webpage/handler/on-resource-error.html | |
page.set('onResourceError', function(resourceError) { | |
console.log('Unable to load resource (#' + resourceError.id + ' URL:' + resourceError.url + ')'); | |
console.log('Error code: ' + resourceError.errorCode + '. Description: ' + resourceError.errorString); | |
}); | |
// http://phantomjs.org/api/webpage/handler/on-resource-timeout.html | |
page.set('onResourceTimeout', function(request) { | |
console.log('Response Timeout (#' + request.id + '): ' + JSON.stringify(request)); | |
}); | |
page.open("https://www.google.com", function (status) { | |
console.log("opened google? ", status); | |
page.evaluate(function () { return document.title; }, function (result) { | |
console.log('Page title is ' + result); | |
ph.exit(); | |
}); | |
}); | |
}); | |
}, /* on Windows only: */ { | |
dnodeOpts: { | |
weak: false | |
} | |
}); |
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var Horseman = require('node-horseman'); | |
var horseman = new Horseman(); | |
horseman | |
.on("consoleMessage", function(msg){ | |
console.log('CONSOLE: ' + msg); | |
}) | |
.on("error", function(msg, trace){ | |
var msgStack = ['ERROR: ' + msg]; | |
if (trace && trace.length) { | |
msgStack.push('TRACE:'); | |
trace.forEach(function(t) { | |
msgStack.push(' -> ' + t.file + ': ' + t.line + (t.function ? ' (in function "' + t.function +'")' : '')); | |
}); | |
} | |
console.error(msgStack.join('\n')); | |
}) | |
.on("resourceError", function(resourceError){ | |
console.log('Unable to load resource (#' + resourceError.id + ' URL:' + resourceError.url + ')'); | |
console.log('Error code: ' + resourceError.errorCode + '. Description: ' + resourceError.errorString); | |
}) | |
.on("resourceTimeout", function(request){ | |
console.log('Response Timeout (#' + request.id + '): ' + JSON.stringify(request)); | |
}) | |
.open('http://www.google.com') | |
.close(); |
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