[BUG] Not able to capture JS error on Playwright Page

[ghost]

Context:

• Playwright Version: 1.13.0
• Operating System: Windows
• Browser: [All, Chromium, Firefox, WebKit]
• Language: C#

Code Snippet

I am trying to capture JS error on Playwright Page using window.onerror event, but window.onerror event is not firing during these JS errors.

Does window.onerror event fires automatically if JS errors occur on a playwright page For example: Pseudo code

window.onerror = function () {
    console.log("JS errors captured");
}

str=""; //str is a Javascript with error
try{
  PlaywrightPage.EvaluateAsync(str);
}
catch
{
  Console.writeLine("Exception occurred");
}

Expected Outcome: JS errors captured Exception Occurred

Actual Outcome: Exception Occurred

Follow up Question What are other ways to capture JS errors if we open a page on browser launched using Playwright? (Other than window.onerror() )

[Meir017]

Try this - https://playwright.dev/dotnet/docs/api/class-page#page-event-page-error

[ghost]

Hi,

Page event error is not working as well. Because exception is caught in catch block itself. Pseudocode:

try{
  PlaywrightPage.EvaluateAsync(str);
}
catch
{
  Console.writeLine("Exception occurred");
}

this.PlaywrightPage.PageError += (_, exception) =>
{
  Console.WriteLine("Uncaught exception at PageError event: " + exception);
};

Output: Exception occured

Can you please confirm that if window.onerror event fires whenever exception occurs on a page launched using playwright? Like this- https://www.tutorialspoint.com/What-is-onerror-Method-in-JavaScript