This set of Javascript Multiple Choice Questions & Answers (MCQs) focuses on “History Management in JavaScript”.
1. What does an History object contain?
a) URL
b) Parameters
c) Attribute values
d) Property
View Answer
Explanation: The history object contains the URLs visited by the user (within a browser window).
2. The history object is a part of which object?
a) Property
b) Window
c) Location
d) Screen
View Answer
Explanation: The history object belongs to the Window object.
3. How many methods are there in the History object?
a) 3
b) 4
c) 5
d) 6
View Answer
Explanation: There are three methods belongign to the History object namely :
- back()
- forward()
- go()
4. What is the purpose of the method forward()?
a) Loads any random URL in the history list
b) Loads the previous URL in the history list
c) Loads a specific URL from the history list
d) Loads the next URL in the history list
View Answer
Explanation: The forward() method loads the next URL in the history list.
5. How will you update the URL displayed in the location bar?
a) location
b) location.URL
c) location.hash
d) url
View Answer
Explanation: The property location.hash needs to be updated to display the updated URL in the location bar.
6. How do you add a particular state to the browsing history?
a) pushState()
b) replaceState()
c) state()
d) none of the mentioned
View Answer
Explanation: The pushState() method adds a particular state to the browsing history.
7. What does the pushState() method do?
a) Removes the state
b) Adds new state
c) Replaces the state
d) None of the mentioned
View Answer
Explanation: When a web app enters a new state, it calls history.pushState() to add that state to the browsing history.
8. Which of the following method is used to replace the current history state instead of adding a new state to the browsing history?
a) replaceState()
b) replace(state)
c) replace()
d) none of the mentioned
View Answer
Explanation: The replaceState() method is used to replace the current history state instead of adding a new state to the browsing history.
9. How many parameters does the replaceState() method take?
a) 2
b) 3
c) 4
d) 5
View Answer
Explanation: window.history.replaceState(stateObj, title, url) : This is just like window.history.pushState, except that the current browser state is removed from the history, so you cannot hit “back” to return to it.
10. What is the purpose of the event window.onpopstate?
a) When a state object is replaced
b) When a state object is added
c) When a state object is removed
d) None of the mentioned
View Answer
Explanation: The window.onpopstate event is fired whenever a state object is removed from the browser history, which occurs on browser “back” or “forward”. State objects are persisted on the user’s hard disk between sessions, which is a nice feature. The object passed into a call to pushState or replaceState is provided as the state property on the event object in the “popstate” event.
Sanfoundry Global Education & Learning Series – Javascript Programming.
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