How do I know a Locator really points to an existing element?

I am using #playwright-java , learning by doing, first time user.

I have been attracted by the ease of use seen in the demos.
However, when facing a complex website it turns out it needs more trial&&error than expected.

Now, when I put the xpath or full xpath I do not get my info :/
Tried (different) xpaths in full page, then in target frame, got them using my browser devtools.

Is there a way to know if a Locator is really points to an existing element ?
When I get an exception, the line numbers are (I believe) for typescript and do not help.

When using debugger, Locator object has xpath attribute set, else a frame reference.

I tried to use the recorder but the selector presented is based on the value.
For a value I get:

page.frameLocator(“#legacy-iframe-3755”).getByRole(AriaRole.CELL, new FrameLocator.GetByRoleOptions().setName(“xxxxx €”)).click();

This wont work in my context (#legacy-iframe-3755 is not a stable value).
Unless there is a way to get a solid (unmutable) xpath from a locator gotten from a value.

Here is the stacktrace, for documentation.

“The expression is not a legal expression” is rather poor.

The guilty code happens in the loop to address the different options of the select droplist.
It is :

Locator locatorTableauPositions = page.locator(Constantes.Positions.IDENTIFIANT_TABLEAU); 
// "xpath=//table@id=tabPTR"
int nombrePositions = locatorTableauPositions.locator("tr").count();    // BOOM

Is my locator not pointing to the target table ?

Is this not the way to get the rows count ?

com.microsoft.playwright.PlaywrightException: Error {
  message='Document.evaluate: The expression is not a legal expression
queryAll@debugger eval code:41:25
_queryEngineAll@debugger eval code:4949:49
querySelectorAll@debugger eval code:4936:30
@debugger eval code line 226 > eval:4:23
evaluate@debugger eval code:228:17
@debugger eval code:1:44

  name='Error
  stack='Error: Document.evaluate: The expression is not a legal expression
queryAll@debugger eval code:41:25
_queryEngineAll@debugger eval code:4949:49
querySelectorAll@debugger eval code:4936:30
@debugger eval code line 226 > eval:4:23
evaluate@debugger eval code:228:17
@debugger eval code:1:44

    at checkException (/tmp/playwright-java-5991555694620122335/package/lib/server/firefox/ffExecutionContext.js:111:121)
    at FFExecutionContext.evaluateWithArguments (/tmp/playwright-java-5991555694620122335/package/lib/server/firefox/ffExecutionContext.js:82:5)
    at async LongStandingScope._race (/tmp/playwright-java-5991555694620122335/package/lib/utils/manualPromise.js:96:14)
    at async evaluateExpression (/tmp/playwright-java-5991555694620122335/package/lib/server/javascript.js:241:12)
    at async FrameSelectors.queryCount (/tmp/playwright-java-5991555694620122335/package/lib/server/frameSelectors.js:74:12)
    at async Frame.queryCount (/tmp/playwright-java-5991555694620122335/package/lib/server/frames.js:736:12)
    at async FrameDispatcher.queryCount (/tmp/playwright-java-5991555694620122335/package/lib/server/dispatchers/frameDispatcher.js:135:14)
    at async LongStandingScope._race (/tmp/playwright-java-5991555694620122335/package/lib/utils/manualPromise.js:96:14)
    at async FrameDispatcher._handleCommand (/tmp/playwright-java-5991555694620122335/package/lib/server/dispatchers/dispatcher.js:96:14)
    at async DispatcherConnection.dispatch (/tmp/playwright-java-5991555694620122335/package/lib/server/dispatchers/dispatcher.js:361:22)
}
    at com.microsoft.playwright.impl.WaitableResult.get(WaitableResult.java:56)
    at com.microsoft.playwright.impl.ChannelOwner.runUntil(ChannelOwner.java:120)
    at com.microsoft.playwright.impl.Connection.sendMessage(Connection.java:130)
    at com.microsoft.playwright.impl.ChannelOwner.sendMessage(ChannelOwner.java:106)
    at com.microsoft.playwright.impl.FrameImpl.queryCount(FrameImpl.java:1116)
    at com.microsoft.playwright.impl.LocatorImpl.count(LocatorImpl.java:165)
    at org.wadael.bourdirconnect.PortefeuilleExtracteur.extraitPortefeuille(PortefeuilleExtracteur.java:153)
    at org.wadael.bourdirconnect.PortefeuilleExtracteur.extraitPortefeuille(PortefeuilleExtracteur.java:35)
    at LeTest.estCeQuilYADuContenu(LeTest.java:33)
    at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
    at java.base/java.lang.reflect.Method.invoke(Method.java:580)
    at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:765)
    at org.junit.jupiter.engine.execution.MethodInvocation.proceed(MethodInvocation.java:60)
    at org.junit.jupiter.engine.execution.InvocationInterceptorChain$ValidatingInvocation.proceed(InvocationInterceptorChain.java:131)
    at org.junit.jupiter.engine.extension.TimeoutExtension.intercept(TimeoutExtension.java:156)
    at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestableMethod(TimeoutExtension.java:147)
    at org.junit.jupiter.engine.extension.TimeoutExtension.interceptTestMethod(TimeoutExtension.java:86)
    at org.junit.jupiter.engine.execution.InterceptingExecutableInvoker$ReflectiveInterceptorCall.lambda$ofVoidMethod$0(InterceptingExecutableInvoker.java:103)
    at org.junit.jupiter.engine.execution.InterceptingExecutableInvoker.lambda$invoke$0(InterceptingExecutableInvoker.java:93)
    at org.junit.jupiter.engine.execution.InvocationInterceptorChain$InterceptedInvocation.proceed(InvocationInterceptorChain.java:106)
    at org.junit.jupiter.engine.execution.InvocationInterceptorChain.proceed(InvocationInterceptorChain.java:64)
    at org.junit.jupiter.engine.execution.InvocationInterceptorChain.chainAndInvoke(InvocationInterceptorChain.java:45)
    at org.junit.jupiter.engine.execution.InvocationInterceptorChain.invoke(InvocationInterceptorChain.java:37)
    at org.junit.jupiter.engine.execution.InterceptingExecutableInvoker.invoke(InterceptingExecutableInvoker.java:92)
    at org.junit.jupiter.engine.execution.InterceptingExecutableInvoker.invoke(InterceptingExecutableInvoker.java:86)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$7(TestMethodTestDescriptor.java:218)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:214)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:139)
    at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:69)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$6(NodeTestTask.java:151)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:141)
    at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$9(NodeTestTask.java:139)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:138)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:95)
    at java.base/java.util.ArrayList.forEach(ArrayList.java:1597)
    at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:41)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$6(NodeTestTask.java:155)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:141)
    at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$9(NodeTestTask.java:139)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:138)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:95)
    at java.base/java.util.ArrayList.forEach(ArrayList.java:1597)
    at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:41)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$6(NodeTestTask.java:155)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$8(NodeTestTask.java:141)
    at org.junit.platform.engine.support.hierarchical.Node.around(Node.java:137)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$9(NodeTestTask.java:139)
    at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:73)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:138)
    at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:95)
    at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:35)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:57)
    at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:54)
    at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:198)
    at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:169)
    at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:93)
    at org.junit.platform.launcher.core.EngineExecutionOrchestrator.lambda$execute$0(EngineExecutionOrchestrator.java:58)
    at org.junit.platform.launcher.core.EngineExecutionOrchestrator.withInterceptedStreams(EngineExecutionOrchestrator.java:141)
    at org.junit.platform.launcher.core.EngineExecutionOrchestrator.execute(EngineExecutionOrchestrator.java:57)
    at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:103)
    at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:85)
    at org.junit.platform.launcher.core.DelegatingLauncher.execute(DelegatingLauncher.java:47)
    at org.junit.platform.launcher.core.SessionPerRequestLauncher.execute(SessionPerRequestLauncher.java:63)
    at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:57)
    at com.intellij.rt.junit.IdeaTestRunner$Repeater$1.execute(IdeaTestRunner.java:38)
    at com.intellij.rt.execution.junit.TestsRepeater.repeat(TestsRepeater.java:11)
    at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:35)
    at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:232)
    at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:55)
Caused by: com.microsoft.playwright.impl.DriverException: Error {
  message='Document.evaluate: The expression is not a legal expression
queryAll@debugger eval code:41:25
_queryEngineAll@debugger eval code:4949:49
querySelectorAll@debugger eval code:4936:30
@debugger eval code line 226 > eval:4:23
evaluate@debugger eval code:228:17
@debugger eval code:1:44

  name='Error
  stack='Error: Document.evaluate: The expression is not a legal expression
queryAll@debugger eval code:41:25
_queryEngineAll@debugger eval code:4949:49
querySelectorAll@debugger eval code:4936:30
@debugger eval code line 226 > eval:4:23
evaluate@debugger eval code:228:17
@debugger eval code:1:44

    at checkException (/tmp/playwright-java-5991555694620122335/package/lib/server/firefox/ffExecutionContext.js:111:121)
    at FFExecutionContext.evaluateWithArguments (/tmp/playwright-java-5991555694620122335/package/lib/server/firefox/ffExecutionContext.js:82:5)
    at async LongStandingScope._race (/tmp/playwright-java-5991555694620122335/package/lib/utils/manualPromise.js:96:14)
    at async evaluateExpression (/tmp/playwright-java-5991555694620122335/package/lib/server/javascript.js:241:12)
    at async FrameSelectors.queryCount (/tmp/playwright-java-5991555694620122335/package/lib/server/frameSelectors.js:74:12)
    at async Frame.queryCount (/tmp/playwright-java-5991555694620122335/package/lib/server/frames.js:736:12)
    at async FrameDispatcher.queryCount (/tmp/playwright-java-5991555694620122335/package/lib/server/dispatchers/frameDispatcher.js:135:14)
    at async LongStandingScope._race (/tmp/playwright-java-5991555694620122335/package/lib/utils/manualPromise.js:96:14)
    at async FrameDispatcher._handleCommand (/tmp/playwright-java-5991555694620122335/package/lib/server/dispatchers/dispatcher.js:96:14)
    at async DispatcherConnection.dispatch (/tmp/playwright-java-5991555694620122335/package/lib/server/dispatchers/dispatcher.js:361:22)
}
    at com.microsoft.playwright.impl.Connection.dispatch(Connection.java:259)
    at com.microsoft.playwright.impl.Connection.processOneMessage(Connection.java:211)
    at com.microsoft.playwright.impl.ChannelOwner.runUntil(ChannelOwner.java:118)
    ... 75 more
 

org.opentest4j.AssertionFailedError: expected: not equal but was: <0>

    at org.junit.jupiter.api.AssertionFailureBuilder.build(AssertionFailureBuilder.java:152)
    at org.junit.jupiter.api.AssertionFailureBuilder.buildAndThrow(AssertionFailureBuilder.java:132)
    at org.junit.jupiter.api.AssertNotEquals.failEqual(AssertNotEquals.java:277)
    at org.junit.jupiter.api.AssertNotEquals.assertNotEquals(AssertNotEquals.java:94)
    at org.junit.jupiter.api.AssertNotEquals.assertNotEquals(AssertNotEquals.java:86)
    at org.junit.jupiter.api.Assertions.assertNotEquals(Assertions.java:1981)
    at LeTest.estCeQuilYADuContenu(LeTest.java:41)
    at java.base/java.lang.reflect.Method.invoke(Method.java:580)
    at java.base/java.util.ArrayList.forEach(ArrayList.java:1597)
    at java.base/java.util.ArrayList.forEach(ArrayList.java:1597)


Process finished with exit code 255

Context:
I am trying to get my info from my broker account.
The code will be made public later although it will only be useful to the broker customers, mostly :fra: customers I believe. So I also pleased myself not coding in English this time.

Page has many frames and the info I am looking for is gotten from a sub page (php).
The iframe name changes over time so locator obtained from recorder is not possible for all infos
I looped in the frames, looked for the html declaring the select, then rewrote the different xpath for:

  • adapting to the frame html root (I loaded it in my browser and used devtools)
  • adapting to the row number

I tried accessing via xpath either from page or a shorter one from the frame.

Thank you for your time and expertise

  • playwright
  • playwright-java

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Filed under: Kiến thức lập trình - @ 21:43

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