Question

When will the fourth argument to open() useful? (a) When the second argument names a retired window (b) When the first argument names an existing window (c) When the second argument names an existing window (d) When the first argument names a retired window The question was posed to me in exam. The question is from Error Handling topic in division Document Object Model and Event Handling in Javascript of JavaScript Select the correct answer from above options JavaScript questions and answers, JavaScript questions pdf, JavaScript question bank, JavaScript questions and answers pdf, mcq on JavaScript pdf, JavaScript questions and solutions, JavaScript mcq Test , Interview JavaScript questions, JavaScript Questions for Interview, JavaScript MCQ (Multiple Choice Questions)

Answer 1

Correct option is (c) When the second argument names an existing window For explanation I would say: The fourth argument to open() is useful only when the second argument names an existing window. This fourth argument is a boolean value that indicates whether the URL specified as the first argument should replace the current entry in the window’s browsing history (true) or create a new entry in the window’s browsing history (false). Omitting this argument is the same as passing false.