JavaScript Interview Questions & Answers

Showing 10 of 78 questions | Page 7

Technical interview questions and answers are extremely important for JavaScript Interviews because JavaScript powers most modern web applications. Companies evaluate your understanding of functions, scope, closures, events, DOM manipulation, ES6 features, promises, async/await, and real-time coding skills. JavaScript is one of the most commonly tested subjects in frontend developer interviews, full-stack roles, and placement assessments. Companies like TCS, Infosys, Wipro, Cognizant, and Accenture frequently include JavaScript questions in their technical rounds. This guide covers the most frequently asked JavaScript interview questions with detailed explanations to help freshers and job seekers prepare effectively. Learning these questions will give you confidence during coding tests, practical tasks, and web development interviews.

Frontend developers should enhance their skills by mastering CSS styling techniques and HTML structure fundamentals

Showing 10 of 78 questions

Per page:

61. How to disable an HTML object ?

document.getElementById("myObject").disabled = true;

62. How to have an element invoke a javascript on selection, instead of going to a new URL: ?

hit me

63. How to have the status line update when the mouse goes over a link (The support of the status line is sporadic)?

Look at the Status bar Look at the Status bar as your cursor goes over the link.

64. How to create a popup warning box

alert('Warning: Please enter an integer between 0 and 100.');

65. How to create a confirmation box?

confirm("Do you really want to launch the missile?");

66. How to create an input box?

prompt("What is your temperature?");

67. How to change style on an element?

Between CSS and javascript is a weird symmetry. CSS style rules are layed on top of the DOM. The CSS property names like "font-weight" are transliterated into "myElement.style.fontWeight". The class of an element can be swapped out. For example: document.getElementById("myText").style.color = "green"; document.getElementById("myText").style.fontSize = "20"; -or- document.getElementById("myText").className = "regular";

68. How to set the cursor to wait ?

In theory, we should cache the current state of the cursor and then put it back to its original state. document.body.style.cursor = 'wait'; //do something interesting and time consuming document.body.style.cursor = 'auto';

69. How to reload the current page ?

window.location.reload(true);