Troubleshooting of selenium errors: Difference between revisions

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[https://www.selenium.dev/ SeleniumHQ Browser Automation] ([https://github.com/php-webdriver/php-webdriver php-webdriver/php-webdriver: PHP client for Selenium/WebDriver protocol. Previously facebook/php-webdriver])
[https://www.selenium.dev/ SeleniumHQ Browser Automation] ([https://github.com/php-webdriver/php-webdriver php-webdriver/php-webdriver: PHP client for Selenium/WebDriver protocol. Previously facebook/php-webdriver])


== How to tracking the selenium errors ==
== How to resolbe the selenium errors ==


* Checking the standalone selenium server is running or not {{kbd | key=<nowiki>ps aux | grep selenium</nowiki>}} on {{Linux}}
* Checking the standalone selenium server is running or not {{kbd | key=<nowiki>ps aux | grep selenium</nowiki>}} on {{Linux}}
* Checking the log file of standalone selenium server e.g. launching the server by the command {{kbd | key=<nowiki>sudo nohup java -jar selenium-server-standalone-3.141.59.jar > /home/user/selenium.log 2>&1 &</nowiki>}}. The log file was located at {{kbd | key=<nowiki>/home/user/selenium.log</nowiki>}}
* Checking the log file of standalone selenium server e.g. launching the server by the command {{kbd | key=<nowiki>sudo nohup java -jar selenium-server-standalone-3.141.59.jar > /home/user/selenium.log 2>&1 &</nowiki>}}. The log file was located at {{kbd | key=<nowiki>/home/user/selenium.log</nowiki>}}
* (optional) Checking the port where the selenium server is running e.g. {{kbd | key=<nowiki>wget http://localhost:4444</nowiki>}}
* Checking the error log file of HTTP server e.g. {{kbd | key=<nowiki>sudo tail /var/log/nginx/error.log</nowiki>}}
* Checking the error log file of HTTP server e.g. {{kbd | key=<nowiki>sudo tail /var/log/nginx/error.log</nowiki>}}
* (optional) Checking the error log file of PHP-FPM e.g. {{kbd | key=<nowiki>sudo tail /var/log/www.access.log</nowiki>}} which its file path defined in the configuration file {{kbd | key=<nowiki>/etc/php-fpm.d/www.conf</nowiki>}}
* (optional) Checking the keyboard event e.g. CTRL works on {{Win}} but not works on {{Mac}}<ref>[https://stackoverflow.com/questions/30937153/selenium-send-keys-what-element-should-i-use python - Selenium - send keys - what element should I use - Stack Overflow]</ref>


== How to resolve Uncaught Facebook\WebDriver\Exception\InvalidSelectorException ==
== How to resolve Uncaught Facebook\WebDriver\Exception\InvalidSelectorException ==
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* [https://chromedriver.chromium.org/downloads Download] the same version of ChromeDriver with the version installed on the computer or server
* [https://chromedriver.chromium.org/downloads Download] the same version of ChromeDriver with the version installed on the computer or server
* You may need to stop the ChromeDriver in the process list if you could not overwrite the existing ChromeDriver file
* You may need to stop the ChromeDriver in the process list if you could not overwrite the existing ChromeDriver file
** {{Win}} (1) keyin {{kbd | key=<nowiki>cmd</nowiki>}} to open the command prompt with the administrative permission (2) and keyin {{kbd | key=<nowiki>taskkill /IM "chromedriver.exe" /F</nowiki>}} to stop the ChromeDriver process
** {{Win}} (1) Open the command prompt with the administrative permission (2) and keyin {{kbd | key=<nowiki>taskkill /IM "chromedriver.exe" /F</nowiki>}} to stop the ChromeDriver process
** {{Linux}}  
** {{Linux}}  
* Overwrite the existing ChromeDriver file
* Overwrite the existing ChromeDriver file
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{{Template:Troubleshooting}}
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[[Category:Web scraping]]

Latest revision as of 22:37, 10 October 2022

SeleniumHQ Browser Automation (php-webdriver/php-webdriver: PHP client for Selenium/WebDriver protocol. Previously facebook/php-webdriver)

How to resolbe the selenium errors[edit]

  • Checking the standalone selenium server is running or not ps aux | grep selenium on Linux Os linux.png
  • Checking the log file of standalone selenium server e.g. launching the server by the command sudo nohup java -jar selenium-server-standalone-3.141.59.jar > /home/user/selenium.log 2>&1 &. The log file was located at /home/user/selenium.log
  • (optional) Checking the port where the selenium server is running e.g. wget http://localhost:4444
  • Checking the error log file of HTTP server e.g. sudo tail /var/log/nginx/error.log
  • (optional) Checking the error log file of PHP-FPM e.g. sudo tail /var/log/www.access.log which its file path defined in the configuration file /etc/php-fpm.d/www.conf
  • (optional) Checking the keyboard event e.g. CTRL works on Win Os windows.png but not works on Mac icon_os_mac.png [1]

How to resolve Uncaught Facebook\WebDriver\Exception\InvalidSelectorException[edit]

Error message 

PHP Fatal error:  Uncaught Facebook\WebDriver\Exception\InvalidSelectorException: invalid selector: The result of the xpath expression "xxx" is: [object Attr]. It should be an element.
  (Session info: chrome=83.0.4103.61) in /path/to/vendor/php-webdriver/webdriver/lib/Exception/WebDriverException.php:105

Situation

  • After the term was keyed in into the text box, the script shuld auto click the specified button which specified by XPath expression.

Possibile soultions

  • Solution1: Using headless chrome[2]
  • Solution2: Not click the button which specified by XPath expression. Send the ENTER to submit the form[3].

How to resolve [WARNING]: This version of ChromeDriver only supports Chrome version xx or [WARNING]: This version of ChromeDriver has not been tested with Chrome version 86[edit]

Situation

  • Download the same version of ChromeDriver with the version installed on the computer or server
  • You may need to stop the ChromeDriver in the process list if you could not overwrite the existing ChromeDriver file
    • Win Os windows.png (1) Open the command prompt with the administrative permission (2) and keyin taskkill /IM "chromedriver.exe" /F to stop the ChromeDriver process
    • Linux Os linux.png
  • Overwrite the existing ChromeDriver file

References[edit]

  1. ↑ python - Selenium - send keys - what element should I use - Stack Overflow
  2. ↑ Getting Started with Headless Chrome  |  Web  |  Google Developers
  3. ↑ selenium - Emulate keypress in webdriver using php - Stack Overflow


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