jQuery Interview Questions and Answers
jQuery interview questions — selectors and traversal, event delegation, AJAX, promises/Deferred, and how jQuery relates to modern vanilla DOM APIs.
7Questions
4Topics
Basic to IntermediateDifficulty
Fresher to 3–5 YrsExperience
- 01 What is the difference between .prop() and .attr() in jQuery? .attr() reads/writes the HTML attribute — the initial value in the markup. .prop() reads/writes the live DOM property…
- 02 What is event delegation in jQuery? Event delegation attaches one handler to a stable ancestor element and uses event bubbling to handle events from…
- 03 Do you still need jQuery, and what are the modern equivalents? For new projects, usually not — modern browsers have native equivalents for what jQuery solved:…
- 04 What is the difference between .bind(), .live(), .delegate() and .on() in jQuery? .on() (jQuery 1.7+) replaced them all. .bind() — direct binding to current elements. .live() — delegated to document…
- 05 What is a jQuery Deferred, and how does it relate to Promises? A jQuery.Deferred is jQuery's promise implementation — you resolve()/reject() it and consumers attach…
- 06 What is the difference between $(document).ready() and $(window).on('load')? $(document).ready() (or the shorthand $(function(){})) fires when the DOM is parsed and ready to manipulate — it…
- 07 What is method chaining in jQuery, and how does it work? Most jQuery methods return the jQuery object they were called on, so you can chain calls:…
No questions match those filters
Try removing a filter or .
About these jQuery questions
jQuery still ships in a huge number of ASP.NET MVC and Web Forms applications, so maintenance roles ask about it. The useful questions are about event delegation (.on() with a selector), chaining and implicit iteration, AJAX and the Deferred/Promise model, and knowing which jQuery habits now have clean native equivalents.