Testing / Selenium Interview questions

What is the JavascriptExecutor in Selenium?

JavascriptExecutor is an interface that lets Selenium execute arbitrary JavaScript directly in the context of the current page, for situations the standard WebDriver API can't handle cleanly on its own.

JavascriptExecutor js = (JavascriptExecutor) driver;
js.executeScript("arguments[0].scrollIntoView(true);", element);
js.executeScript("arguments[0].click();", element);
String title = (String) js.executeScript("return document.title;");

Common uses include scrolling an element into view before interacting with it, forcing a click on an element that WebDriver's own actionability logic considers obscured (a workaround that should be used sparingly, since it bypasses the same checks that catch real bugs), and reading values computed by page JavaScript that aren't exposed as plain attributes.

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JavascriptExecutor allows Selenium to: Only read cookies

✗ Try again if not.

Run arbitrary JavaScript in the page's context

✓ Correct! Well done.

Replace the browser driver entirely

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Using JavaScript to force a click on an obscured element: Is always the safest first option

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Should be used sparingly since it bypasses real actionability checks

✓ Correct! Well done.

Is required for every click

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