ElementNotVisibleException when use headless Chrome browser

问题

When I run test script in headless mode chrome browser, element link is not visible, is not able to do linkElement.click(). in head mode is everything OK. All other info are in stacktrace. Anyone knows what to do, please?

StackTrace:

ERROR occurred: Message: element not visible
(Session info: headless chrome=60.0.3112.90)
(Driver info: chromedriver=2.31.488763 (092de99f48a300323ecf8c2a4e2e7cab51de5ba8),platform=Windows NT 6.1.7601 SP1 x86_64)
Traceback (most recent call last):
File "C:\nik-x.py", line 148, in main
func(nik)
File "C:\lib\support.py", line 121, in wrapper
raise ret
File "C:\lib\support.py", line 108, in newFunc
res[0] = func(*args, **kwargs)
File "C:\testcases\nik-1003.py", line 37, in testcase
i.click()
File "C:\Python36\lib\site-packages\selenium\webdriver\remote\webelement.py", line 7
7, in click
self._execute(Command.CLICK_ELEMENT)
File "C:\Python36\lib\site-packages\selenium\webdriver\remote\webelement.py", line 4
93, in _execute
return self._parent.execute(command, params)
File "C:\Python36\lib\site-packages\selenium\webdriver\remote\webdriver.py", line 25
6, in execute
self.error_handler.check_response(response)
File "C:\Python36\lib\site-packages\selenium\webdriver\remote\errorhandler.py", line
194, in check_response
raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.ElementNotVisibleException: Message: element not visible
(Session info: headless chrome=60.0.3112.90)
(Driver info: chromedriver=2.31.488763 (092de99f48a300323ecf8c2a4e2e7cab51de5ba8),platform=Windows NT 6.1.7601 SP1 x86_64)

Here is my piece of code:
icons = nik.elementLeftmenuSportIcons() for i in icons[:-1]: try: i.click()

HTML from testing page: <a href="#" class="default b_futbal gaPageEventElement" data-ga-cat="Sporty" data-ga-action="futbal"> <span class="left-menu-only-large-res">Futbal</span> </a>

回答1:

I think the problem is, that the Element is really not visible in the default viewbox (600x800) of Headless Chrome.

The window size of the Headless Browser must be set as a Argument when starting chrome. I'm using javascript (I think the API looks similar under python):

var Options = require('selenium-webdriver/chrome').Options;
var options = new Options();
options.addArguments('headless');
options.addArguments('disable-gpu');
options.addArguments('window-size=1200,1100');

browser = builder.forBrowser('chrome').setChromeOptions(options).build();

Additional Info

I'm setup up the window size also by webdriver with browser.manage().window().setSize(1200,1100); But this command is not sufficient in headless chrome. In the non headless variant this is working.

回答2:

You can do this in two ways as below.

1.Passing window size in chrome options as mentioned below(Before instantiating driver instance):

ChromeOptions options = new ChromeOptions()
options.addArguments("headless");
options.addArguments("window-size=1200,1100");
WebDriver driver = new ChromeDriver(options);

2.Set window size after instantiating chrome driver:

WebDriver webDriver= new ChromeDriver();
webDriver.manage().window().setSize(new Dimension(1200,1100));

回答3:

options.addArguments('window-size=1200,1100');

Worked for me in headless chrome mode :) Thanks a lot @powerpete

Below are the complete settings for headless chrome in groovy:-

        ChromeOptions options = new ChromeOptions()
        DesiredCapabilities capabilities = DesiredCapabilities.chrome()
        options.addArguments('headless','disable-gpu','--test-type','--ignore-certificate-errors')
        options.addArguments('window-size=1200,1100');
        capabilities.setCapability(CapabilityType.ACCEPT_SSL_CERTS, true);
        capabilities.setCapability(ChromeOptions.CAPABILITY, options)
        driver = {new ChromeDriver(capabilities)}

回答4:

If changing the window size doesn't work for anyone like me, it may be that the HTML actually changes between headless mode and headed mode.

I had a similar issue, but the headless worked in FireFox and not Chrome. The Xpath for the Chrome element worked only in headed mode. I found out the HTML was changing slightly in Chrome's headless mode.

I fixed this by substituting the Xpath from the element on Chrome with the Xpath from the element on FireFox when using headless mode in Chrome.

来源：https://stackoverflow.com/questions/45562750/elementnotvisibleexception-when-use-headless-chrome-browser