[selenium-users] Selenium (java) with Chrome-driver, ignoring "not defined" javascript errors

[Martin]

Hello!
I am trying to write a test for my online shopping web page where I want to
execute javascript that enables some discounts. Executing the scripts
through the browser console works perfectly, however when I try to execute
them using java and selenium, I get an error telling me that the js method
is undefined (which it is, I get the same message in the browser console,
but the browser just ignores it and executes it anyway. With Selenium it
crashes and does not execute the script).
I can unfortunately not change the javascript/html code itself, so I would
need to fix it just using Java/Selenium.

Is there a way to tell Selenium to ignore the Java Script errors and
continue executing the scripts anyway?


The relevant code that gives me the error is the following:


*public WebDriver driver;*

*driver = new ChromeDriver();*

*JavascriptExecutor js = (JavascriptExecutor) driver; *
*js.executeScript("addFakeRule(\"7914\", {isNew: true});");*


The error I receive which makes the test case quit without finishing is:

*org.openqa.selenium.WebDriverException: unknown error: addFakeDataRule is
not defined*

I am using the Selenium-java-3.0.0 and the latest Chrome driver, and the
java code is written using latest Eclipse Neon on Windows 8.1.

Have been searching the web for hours and can't find a way to ignore the JS
error and just proceed with the script execution.

Any help is truly appreciated!



Here is the complete error/stacktrace that I am gettin*g:*
*org.openqa.selenium.WebDriverException: unknown error: addFakeRule is not
defined*
* (Session info: chrome=54.0.2840.71)*
* (Driver info: chromedriver=2.24.417431
(9aea000394714d2fbb20850021f6204f2256b9cf),platform=Windows NT 6.3.9600
x86_64) (WARNING: The server did not provide any stacktrace information)*
*Command duration or timeout: 40 milliseconds*
*Build info: version: 'unknown', revision: '350cf60', time: '2016-10-13
10:43:56 -0700'*
*System info: host: 'MMA-CZC3094Z8B', ip: '10.19.210.101', os.name:
'Windows 8.1', os.arch: 'amd64', os.version: '6.3', java.version:
'1.8.0_111'*
*Driver info: org.openqa.selenium.chrome.ChromeDriver*
*Capabilities [{applicationCacheEnabled=false, rotatable=false,
mobileEmulationEnabled=false, networkConnectionEnabled=false,
chrome={chromedriverVersion=2.24.417431
(9aea000394714d2fbb20850021f6204f2256b9cf),
userDataDir=c:\temp\scoped_dir3536_18951}, takesHeapSnapshot=true,
pageLoadStrategy=normal, databaseEnabled=false, handlesAlerts=true,
hasTouchScreen=false, version=54.0.2840.71, platform=WIN8_1,
browserConnectionEnabled=false, nativeEvents=true, acceptSslCerts=true,
locationContextEnabled=true, webStorageEnabled=true, browserName=chrome,
takesScreenshot=true, javascriptEnabled=true, cssSelectorsEnabled=true}]*
*Session ID: 6ba9f4715531bdd6ae439ac07665e101*
* at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)*
* at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)*
* at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown
Source)*
* at java.lang.reflect.Constructor.newInstance(Unknown Source)*
* at
org.openqa.selenium.remote.ErrorHandler.createThrowable(ErrorHandler.java:216)*
* at
org.openqa.selenium.remote.ErrorHandler.throwIfResponseFailed(ErrorHandler.java:168)*
* at
org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:635)*
* at
org.openqa.selenium.remote.RemoteWebDriver.executeScript(RemoteWebDriver.java:537)*
* at IKEA_Test.TestCases.testDiscounts(TestCases.java:89)*
* at IKEA_Test.InitiateTest.testDiscounts(InitiateTest.java:57)*
* at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)*
* at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)*
* at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)*
* at java.lang.reflect.Method.invoke(Unknown Source)*
* at
org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:100)*
* at org.testng.internal.Invoker.invokeMethod(Invoker.java:646)*
* at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:811)*
* at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1137)*
* at
org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:129)*
* at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:112)*
* at org.testng.TestRunner.privateRun(TestRunner.java:753)*
* at org.testng.TestRunner.run(TestRunner.java:607)*
* at org.testng.SuiteRunner.runTest(SuiteRunner.java:368)*
* at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:363)*
* at org.testng.SuiteRunner.privateRun(SuiteRunner.java:321)*
* at org.testng.SuiteRunner.run(SuiteRunner.java:270)*
* at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)*
* at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)*
* at org.testng.TestNG.runSuitesSequentially(TestNG.java:1284)*
* at org.testng.TestNG.runSuitesLocally(TestNG.java:1209)*
* at org.testng.TestNG.runSuites(TestNG.java:1124)*
* at org.testng.TestNG.run(TestNG.java:1096)*
* at
org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:132)*
* at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:236)*
* at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:81)*

[Simon Stewart]

This is expected behaviour. The error you see on the console is the result
of the exception being thrown. "executeScript" is merely doing the same
thing. There are many ways to get this working:

1) Don't call a function that doesn't exist.

2) Call the function, but wrap with a try/catch block in JS if you expect
this method to sometimes be present

3) Check for the presence of the function in your JS and add a stub
function that does nothing if it's missing.

Kind regards,

Simon

Post by Martin
Hello!
I am trying to write a test for my online shopping web page where I want
to execute javascript that enables some discounts. Executing the scripts
through the browser console works perfectly, however when I try to execute
them using java and selenium, I get an error telling me that the js method
is undefined (which it is, I get the same message in the browser console,
but the browser just ignores it and executes it anyway. With Selenium it
crashes and does not execute the script).
I can unfortunately not change the javascript/html code itself, so I would
need to fix it just using Java/Selenium.
Is there a way to tell Selenium to ignore the Java Script errors and
continue executing the scripts anyway?
*public WebDriver driver;*
*driver = new ChromeDriver();*
*JavascriptExecutor js = (JavascriptExecutor) driver; *
*js.executeScript("addFakeRule(\"7914\", {isNew: true});");*
*org.openqa.selenium.WebDriverException: unknown error: addFakeDataRule is
not defined*
I am using the Selenium-java-3.0.0 and the latest Chrome driver, and the
java code is written using latest Eclipse Neon on Windows 8.1.
Have been searching the web for hours and can't find a way to ignore the
JS error and just proceed with the script execution.
Any help is truly appreciated!
Here is the complete error/stacktrace that I am gettin*g:*
*org.openqa.selenium.WebDriverException: unknown error: addFakeRule is not
defined*
* (Session info: chrome=54.0.2840.71)*
* (Driver info: chromedriver=2.24.417431
(9aea000394714d2fbb20850021f6204f2256b9cf),platform=Windows NT 6.3.9600
x86_64) (WARNING: The server did not provide any stacktrace information)*
*Command duration or timeout: 40 milliseconds*
*Build info: version: 'unknown', revision: '350cf60', time: '2016-10-13
10:43:56 -0700'*
*System info: host: 'MMA-CZC3094Z8B', ip: '10.19.210.101', os.name
<http://os.name>: 'Windows 8.1', os.arch: 'amd64', os.version: '6.3',
java.version: '1.8.0_111'*
*Driver info: org.openqa.selenium.chrome.ChromeDriver*
*Capabilities [{applicationCacheEnabled=false, rotatable=false,
mobileEmulationEnabled=false, networkConnectionEnabled=false,
chrome={chromedriverVersion=2.24.417431
(9aea000394714d2fbb20850021f6204f2256b9cf),
userDataDir=c:\temp\scoped_dir3536_18951}, takesHeapSnapshot=true,
pageLoadStrategy=normal, databaseEnabled=false, handlesAlerts=true,
hasTouchScreen=false, version=54.0.2840.71, platform=WIN8_1,
browserConnectionEnabled=false, nativeEvents=true, acceptSslCerts=true,
locationContextEnabled=true, webStorageEnabled=true, browserName=chrome,
takesScreenshot=true, javascriptEnabled=true, cssSelectorsEnabled=true}]*
*Session ID: 6ba9f4715531bdd6ae439ac07665e101*
* at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)*
* at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)*
* at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown
Source)*
* at java.lang.reflect.Constructor.newInstance(Unknown Source)*
* at
org.openqa.selenium.remote.ErrorHandler.createThrowable(ErrorHandler.java:216)*
* at
org.openqa.selenium.remote.ErrorHandler.throwIfResponseFailed(ErrorHandler.java:168)*
* at
org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:635)*
* at
org.openqa.selenium.remote.RemoteWebDriver.executeScript(RemoteWebDriver.java:537)*
* at IKEA_Test.TestCases.testDiscounts(TestCases.java:89)*
* at IKEA_Test.InitiateTest.testDiscounts(InitiateTest.java:57)*
* at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)*
* at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)*
* at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)*
* at java.lang.reflect.Method.invoke(Unknown Source)*
* at
org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:100)*
* at org.testng.internal.Invoker.invokeMethod(Invoker.java:646)*
* at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:811)*
* at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1137)*
* at
org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:129)*
* at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:112)*
* at org.testng.TestRunner.privateRun(TestRunner.java:753)*
* at org.testng.TestRunner.run(TestRunner.java:607)*
* at org.testng.SuiteRunner.runTest(SuiteRunner.java:368)*
* at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:363)*
* at org.testng.SuiteRunner.privateRun(SuiteRunner.java:321)*
* at org.testng.SuiteRunner.run(SuiteRunner.java:270)*
* at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)*
* at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)*
* at org.testng.TestNG.runSuitesSequentially(TestNG.java:1284)*
* at org.testng.TestNG.runSuitesLocally(TestNG.java:1209)*
* at org.testng.TestNG.runSuites(TestNG.java:1124)*
* at org.testng.TestNG.run(TestNG.java:1096)*
* at
org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:132)*
* at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:236)*
* at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:81)*
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[Martin]

Thank you for you answer. I know that I can catch the error and have the
rest of the code proceed with the execution, however then the JS command
that generated the error will be skipped. Maybe error was the wrong word to
use, it's more of a message telling me that the JS command I am trying to
execute is undefined, and I do not care about that, I want to execute it
anyway. As I said, if I run the command in Google Chromes console (not
using selenium), then the command executes without any issues (except for
telling me about the undefined method, but it still executes and does what
it is supposed to do). I would like Selenium to run the JS commands I throw
at it without checking if they generate any errors or not, "just do it
Selenium" so to speak.

I have found out that there is a way to tell Selenium to skip JS error
messages if you use the HTMLUnitDriver, the HTML driver has a method called
getOptions().setThrowExceptionOnScriptError(false); which does exactly what
I want, except it is just for the HTMLUnitDriver and not for the ordinary
ChromeDriver/FirefoxDriver. So I would need a similar function for the
Chrome or Firefox driver. In essence, I want to execute my JS command which
generates a "undefined" message without Selenium stopping it because of the
message.

Post by Simon Stewart
This is expected behaviour. The error you see on the console is the result
of the exception being thrown. "executeScript" is merely doing the same
1) Don't call a function that doesn't exist.
2) Call the function, but wrap with a try/catch block in JS if you expect
this method to sometimes be present
3) Check for the presence of the function in your JS and add a stub
function that does nothing if it's missing.
Kind regards,
Simon

Post by Martin
Hello!
I am trying to write a test for my online shopping web page where I want
to execute javascript that enables some discounts. Executing the scripts
through the browser console works perfectly, however when I try to execute
them using java and selenium, I get an error telling me that the js method
is undefined (which it is, I get the same message in the browser console,
but the browser just ignores it and executes it anyway. With Selenium it
crashes and does not execute the script).
I can unfortunately not change the javascript/html code itself, so I
would need to fix it just using Java/Selenium.
Is there a way to tell Selenium to ignore the Java Script errors and
continue executing the scripts anyway?
*public WebDriver driver;*
*driver = new ChromeDriver();*
*JavascriptExecutor js = (JavascriptExecutor) driver; *
*js.executeScript("addFakeRule(\"7914\", {isNew: true});");*
*org.openqa.selenium.WebDriverException: unknown error: addFakeDataRule
is not defined*
I am using the Selenium-java-3.0.0 and the latest Chrome driver, and the
java code is written using latest Eclipse Neon on Windows 8.1.
Have been searching the web for hours and can't find a way to ignore the
JS error and just proceed with the script execution.
Any help is truly appreciated!
Here is the complete error/stacktrace that I am gettin*g:*
*org.openqa.selenium.WebDriverException: unknown error: addFakeRule is
not defined*
* (Session info: chrome=54.0.2840.71)*
* (Driver info: chromedriver=2.24.417431
(9aea000394714d2fbb20850021f6204f2256b9cf),platform=Windows NT 6.3.9600
x86_64) (WARNING: The server did not provide any stacktrace information)*
*Command duration or timeout: 40 milliseconds*
*Build info: version: 'unknown', revision: '350cf60', time: '2016-10-13
10:43:56 -0700'*
*System info: host: 'MMA-CZC3094Z8B', ip: '10.19.210.101', os.name
<http://os.name>: 'Windows 8.1', os.arch: 'amd64', os.version: '6.3',
java.version: '1.8.0_111'*
*Driver info: org.openqa.selenium.chrome.ChromeDriver*
*Capabilities [{applicationCacheEnabled=false, rotatable=false,
mobileEmulationEnabled=false, networkConnectionEnabled=false,
chrome={chromedriverVersion=2.24.417431
(9aea000394714d2fbb20850021f6204f2256b9cf),
userDataDir=c:\temp\scoped_dir3536_18951}, takesHeapSnapshot=true,
pageLoadStrategy=normal, databaseEnabled=false, handlesAlerts=true,
hasTouchScreen=false, version=54.0.2840.71, platform=WIN8_1,
browserConnectionEnabled=false, nativeEvents=true, acceptSslCerts=true,
locationContextEnabled=true, webStorageEnabled=true, browserName=chrome,
takesScreenshot=true, javascriptEnabled=true, cssSelectorsEnabled=true}]*
*Session ID: 6ba9f4715531bdd6ae439ac07665e101*
* at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)*
* at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)*
* at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown
Source)*
* at java.lang.reflect.Constructor.newInstance(Unknown Source)*
* at
org.openqa.selenium.remote.ErrorHandler.createThrowable(ErrorHandler.java:216)*
* at
org.openqa.selenium.remote.ErrorHandler.throwIfResponseFailed(ErrorHandler.java:168)*
* at
org.openqa.selenium.remote.RemoteWebDriver.execute(RemoteWebDriver.java:635)*
* at
org.openqa.selenium.remote.RemoteWebDriver.executeScript(RemoteWebDriver.java:537)*
* at IKEA_Test.TestCases.testDiscounts(TestCases.java:89)*
* at IKEA_Test.InitiateTest.testDiscounts(InitiateTest.java:57)*
* at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)*
* at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)*
* at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)*
* at java.lang.reflect.Method.invoke(Unknown Source)*
* at
org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:100)*
* at org.testng.internal.Invoker.invokeMethod(Invoker.java:646)*
* at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:811)*
* at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1137)*
* at
org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:129)*
* at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:112)*
* at org.testng.TestRunner.privateRun(TestRunner.java:753)*
* at org.testng.TestRunner.run(TestRunner.java:607)*
* at org.testng.SuiteRunner.runTest(SuiteRunner.java:368)*
* at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:363)*
* at org.testng.SuiteRunner.privateRun(SuiteRunner.java:321)*
* at org.testng.SuiteRunner.run(SuiteRunner.java:270)*
* at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)*
* at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)*
* at org.testng.TestNG.runSuitesSequentially(TestNG.java:1284)*
* at org.testng.TestNG.runSuitesLocally(TestNG.java:1209)*
* at org.testng.TestNG.runSuites(TestNG.java:1124)*
* at org.testng.TestNG.run(TestNG.java:1096)*
* at
org.testng.remote.AbstractRemoteTestNG.run(AbstractRemoteTestNG.java:132)*
* at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:236)*
* at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:81)*
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