RSelenium sendKeysToActiveElement() function 抛出未知命令错误

Question

我正在尝试使用 RSelenium 的sendKeysToActiveElement() function 按回车键，但它抛出了以下错误。

remDr$sendKeysToActiveElement(list("", key="back"))

它抛出以下错误：

Selenium message:sendKeysToActiveElement
Build info: version: '3.141.59', revision: 'e82be7d358', time: '2018-11-14T08:25:53'
System info: host: 'DEV-WINDOWS', ip: '192.168.1.18', os.name: 'Windows 10', os.arch: 'amd64', os.version: '10.0', java.version: '1.8.0_201'
Driver info: driver.version: unknown

Error:   Summary: UnknownCommand
     Detail: The requested resource could not be found, or a request was received using an HTTP method that is not supported by the mapped resource.
     Further Details: run errorDetails method

这是errorDetails() shows的内容：

remDr$errorDetails()
$stacktrace
[1] "org.openqa.selenium.UnsupportedCommandException: sendKeysToActiveElement\nBuild info: version: '3.141.59', revision: 'e82be7d358', time: '2018-11-14T08:25:53'\nSystem info: host: 'DEV-WINDOWS', ip: '192.168.1.18', os.name: 'Windows 10', os.arch: 'amd64', os.version: '10.0', java.version: '1.8.0_201'\nDriver info: driver.version: unknown\r\n\tat org.openqa.selenium.remote.http.AbstractHttpCommandCodec.encode(AbstractHttpCommandCodec.java:218)\r\n\tat org.openqa.selenium.remote.http.AbstractHttpCommandCodec.encode(AbstractHttpCommandCodec.java:117)\r\n\tat org.openqa.selenium.grid.session.remote.ProtocolConverter.handle(ProtocolConverter.java:83)\r\n\tat org.openqa.selenium.grid.session.remote.RemoteSession.execute(RemoteSession.java:129)\r\n\tat org.openqa.selenium.remote.server.WebDriverServlet.lambda$handle$0(WebDriverServlet.java:235)\r\n\tat java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)\r\n\tat java.util.concurrent.FutureTask.run(FutureTask.java:266)\r\n\tat java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)\r\n\tat java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)\r\n\tat java.lang.Thread.run(Thread.java:748)\r\n"

$stackTrace
$stackTrace[[1]]
$stackTrace[[1]]$fileName
[1] "AbstractHttpCommandCodec.java"

$stackTrace[[1]]$methodName
[1] "encode"

$stackTrace[[1]]$className
[1] "org.openqa.selenium.remote.http.AbstractHttpCommandCodec"

$stackTrace[[1]]$lineNumber
[1] 218


$stackTrace[[2]]
$stackTrace[[2]]$fileName
[1] "AbstractHttpCommandCodec.java"

$stackTrace[[2]]$methodName
[1] "encode"

$stackTrace[[2]]$className
[1] "org.openqa.selenium.remote.http.AbstractHttpCommandCodec"

$stackTrace[[2]]$lineNumber
[1] 117


$stackTrace[[3]]
$stackTrace[[3]]$fileName
[1] "ProtocolConverter.java"

$stackTrace[[3]]$methodName
[1] "handle"

$stackTrace[[3]]$className
[1] "org.openqa.selenium.grid.session.remote.ProtocolConverter"

$stackTrace[[3]]$lineNumber
[1] 83


$stackTrace[[4]]
$stackTrace[[4]]$fileName
[1] "RemoteSession.java"

$stackTrace[[4]]$methodName
[1] "execute"

$stackTrace[[4]]$className
[1] "org.openqa.selenium.grid.session.remote.RemoteSession"

$stackTrace[[4]]$lineNumber
[1] 129


$stackTrace[[5]]
$stackTrace[[5]]$fileName
[1] "WebDriverServlet.java"

$stackTrace[[5]]$methodName
[1] "lambda$handle$0"

$stackTrace[[5]]$className
[1] "org.openqa.selenium.remote.server.WebDriverServlet"

$stackTrace[[5]]$lineNumber
[1] 235


$stackTrace[[6]]
$stackTrace[[6]]$fileName
[1] "Executors.java"

$stackTrace[[6]]$methodName
[1] "call"

$stackTrace[[6]]$className
[1] "java.util.concurrent.Executors$RunnableAdapter"

$stackTrace[[6]]$lineNumber
[1] 511


$stackTrace[[7]]
$stackTrace[[7]]$fileName
[1] "FutureTask.java"

$stackTrace[[7]]$methodName
[1] "run"

$stackTrace[[7]]$className
[1] "java.util.concurrent.FutureTask"

$stackTrace[[7]]$lineNumber
[1] 266


$stackTrace[[8]]
$stackTrace[[8]]$fileName
[1] "ThreadPoolExecutor.java"

$stackTrace[[8]]$methodName
[1] "runWorker"

$stackTrace[[8]]$className
[1] "java.util.concurrent.ThreadPoolExecutor"

$stackTrace[[8]]$lineNumber
[1] 1149


$stackTrace[[9]]
$stackTrace[[9]]$fileName
[1] "ThreadPoolExecutor.java"

$stackTrace[[9]]$methodName
[1] "run"

$stackTrace[[9]]$className
[1] "java.util.concurrent.ThreadPoolExecutor$Worker"

$stackTrace[[9]]$lineNumber
[1] 624


$stackTrace[[10]]
$stackTrace[[10]]$fileName
[1] "Thread.java"

$stackTrace[[10]]$methodName
[1] "run"

$stackTrace[[10]]$className
[1] "java.lang.Thread"

$stackTrace[[10]]$lineNumber
[1] 748


$message
[1] "sendKeysToActiveElement\nBuild info: version: '3.141.59', revision: 'e82be7d358', time: '2018-11-14T08:25:53'\nSystem info: host: 'DEV-WINDOWS', ip: '192.168.1.18', os.name: 'Windows 10', os.arch: 'amd64', os.version: '10.0', java.version: '1.8.0_201'\nDriver info: driver.version: unknown"

$error
[1] "unknown command"

sessionInfo()显示如下：

> sessionInfo()
R version 4.0.0 (2020-04-24)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 10 x64 (build 18363)

Matrix products: default

locale:
[1] LC_COLLATE=English_India.1252  LC_CTYPE=English_India.1252   
[3] LC_MONETARY=English_India.1252 LC_NUMERIC=C                  
[5] LC_TIME=English_India.1252    

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods  
[7] base     

other attached packages:
[1] knitr_1.28        XML_3.99-0.3      RSelenium_1.7.7  
[4] animint2_2020.3.2 testthat_2.3.2   

loaded via a namespace (and not attached):
 [1] Rcpp_1.0.4.6     compiler_4.0.0   plyr_1.8.6      
 [4] bitops_1.0-6     tools_4.0.0      pkgload_1.1.0   
 [7] digest_0.6.25    jsonlite_1.6.1   evaluate_0.14   
[10] lifecycle_0.2.0  gtable_0.3.0     rlang_0.4.6     
[13] cli_2.0.2        rstudioapi_0.11  curl_4.3        
[16] yaml_2.2.1       xfun_0.14        binman_0.1.1    
[19] stringr_1.4.0    withr_2.2.0      httr_1.4.1      
[22] xml2_1.3.2       desc_1.2.0       askpass_1.1     
[25] caTools_1.18.0   rappdirs_0.3.1   rprojroot_1.3-2 
[28] grid_4.0.0       glue_1.4.1       R6_2.4.1        
[31] processx_3.4.2   fansi_0.4.1      rmarkdown_2.2   
[34] RJSONIO_1.3-1.4  farver_2.0.3     semver_0.2.0    
[37] magrittr_1.5     backports_1.1.7  scales_1.1.1    
[40] ps_1.3.3         htmltools_0.4.0  assertthat_0.2.1
[43] colorspace_1.4-1 labeling_0.3     stringi_1.4.6   
[46] openssl_1.4.1    munsell_0.5.0    crayon_1.3.4    
[49] wdman_0.2.5

Answer 1

这是 RSelenium 文档所说的：

这是一组R Bindings for Selenium 2.0 Remote WebDriver，可以从http://selenium-release.storage.googleapis.com/index.html下载。 此绑定不适用于 Selenium 的 1.0 版本。

由于在 selenium v3 中做了重大更改，这个 function 不起作用。

我使用的是错误版本的 selenium。我使用的是 v3 而不是 v2。

更改 selenium 版本解决了这个问题。

Answer 2

我遇到了同样的问题，@lazycipher 建议，降级 selenium 版本有帮助。 我是这样做的：

1. Go 至http://selenium-release.storage.googleapis.com/index.html
2. 导航到2.53文件夹
3. 下载selenium-server-standalone-2.53.1.jar
4. 将jar文件移动到以下位置的文件夹中：
   • Linux: /home/[用户]/.local/share/binman_seleniumserver/generic/ /home/[user]/.local/share/binman_seleniumserver/generic/2.53.1
   • Windows: C:\Users\[user]\AppData\Local\binman\binman_seleniumserver\generic\2.53.1\
   • MACOSX: /Users/admin/Library/Application\Support/binman_seleniumserver/generic/2.53.1/
5. 使用binman::list_versions("seleniumserver")检查是否列出了下载的版本
6. 使用version = '2.53.1'参数运行RSelenium::rsDriver()

事实证明，当RSelenium::rsDriver()访问 selenium 版本时，它引用binman package 将其定向到正确的 selenium jar 文件。 如果将 jar 文件放在正确的文件夹中，则binman RSelenium检测到它。