Handling JavaScript errors with Selenium in C#

Currently, I am running tests with Selenium web driver using C# and my objective is to ensure that there are no JavaScript errors present on my web pages.

To facilitate this process, I have integrated the JSErrorCollector.xpi plugin for Firefox and included the following code snippet into my script (sourced from here).

List<object> errors = (List<object>)((_driver).executeScript("return window.JSErrorCollector_errors.pump()");
Assert.IsNull(errors);

However, upon execution, an error message pops up:

window.JSErrorCollector_errors is undefined (UnexpectedJavaScriptError)

I would appreciate any suggestions on how to resolve this issue or if there is a more effective alternative method available.

c#javascriptseleniumselenium-webdriver

Answer №1

Here is a JavaScript solution that does not rely on JSErrorCollector.xpi. By using the JavaScriptExecutor, you can run the following code:

var errorList = [];
window.onerror = function(message, file, line) {
    errorList.push("message: " + message + ", file: " + file + ", line:  " + line);
};

Whenever you want to retrieve the errors, simply execute this JavaScript:

return errorList;

The only limitation is that it will only capture errors occurring after running the initial script. However, based on your query, it seems like this may be sufficient for your needs.

Answer №2

Attempting to access the pump method of the JSErrorCollector_errors object in the window namespace results in an error. It is important to verify that the JSErrorCollector_errors object exists before calling its pump function.

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