Correct syntax for taking screenshots with Selenium's WebDriverJs on Node

Question

What is the correct way of taking a screenshot when running a webdriver test with Selenium's webdriverjs?

I have the stand-alone selenium server started and I can see the command for taking screenshot is logged on the selenium-server, but the screenshot is not being saved.

My code is the following:

var webdriver = require('selenium-webdriver');
var driver = new webdriver.Builder().usingServer('http://localURL:4444/wd/hub').withCapabilities({'browserName': 'chrome'}).build();
driver.get([URL to webserver on my local machine])

driver.takeScreenshot("c:\\selenium_local_map\\out1.png");

Euratom

Answer 1

Take screenshot returns a promise that will resolve with a Base64 encoded png. To write the data, you'll need to do something like the following:

function writeScreenshot(data, name) {
  name = name || 'ss.png';
  var screenshotPath = 'C:\\selenium_local_map\\';
  fs.writeFileSync(screenshotPath + name, data, 'base64');
};

driver.takeScreenshot().then(function(data) {
  writeScreenshot(data, 'out1.png');
});

More documentation can be found here

Postdoctoral

This is awesome, thank you! Just wanted to add for fellow Node n00bs who are going to copy and paste this then wonder what to do about the resulting error - add the following to line 2: var fs = require('fs'); – Brod

For this code to work, you need to include the following line: var fs = require('fs'); I spent some time trying to find out what that "fs" was about. you have to install the package then this solution will work: italic npm install fs italic – Steiner

Node.js includes the fs module. You just need to require it, not install it separately. – Sixtasixteen