JQuery interview questions and Answers
jQuery is a feature-rich, lightweight, and fast JavaScript library, which makes HTML documents, event handling, Ajax, and animation easier with a simple API that works across almost all browsers. These jQuery interview questions will enhance your skills and help you to write in a mainstream JavaScript library, used by major players. The critical purpose of jQuery is to make using JavaScript more convenient on your website. A great combination of extensibility and flexibility, jQuery takes a lot of general tasks that require multiple lines of JavaScript code and wraps them in a manner that you can use with a single line of code.
Most Frequently Asked JQuery interview questions
$("#buttonID").click(function(){
$("YOUR_TAG_OR_CLASS_OR_ID").removeClass("YOUR_CLASS_NAME");
});
jQuery end() technique ends the most recent filtering operation in the current chain, and return the matched set of factors to its preceding state. This technique does now not take any arguments.
jQuery is a javascript library which was created by John Resig in the year 2006.jQuery was designed to make the javascript coding easy to use while creating the website and the applications. jQuery is the free open-source software. It is the most popular and the most used javascript library.
As like many other JavaScript libraries, jQuery uses $ as a variable name or function All the functionalities available in jQuery is without using $. The JQuery.noConflict method is used to give control of the $ variable back to the library which implemented it. This helps developers to make sure that the $object of libraries doesn’t conflict with jQuery operations.
CDN stands for Control Delivery Network.CDN is the group of many servers which are located at the many different locations. The job of these servers is to store the copy of the data with them so that they can acknowledge the data request based on which server is nearest to the end user. As a result, the data reaches to the end user very fast and very less affected by the traffic.
Selectors are the formats used to identify and operate HTML elements. For instance, to select all checkboxes in a web form then we can use [type="checkbox"] selector.
<script>
var input = $( "form input:checkbox" )
.wrap( "" )
.parent()
.css({ background: "yellow", border: "3px red solid" });
</script>
- jQuery combines good practices of the programming
- jQuery application is easy
- jQuery saves the bandwidth of the server
- jQuery runs on all internet leading browsers like Firefox, Chrome, Microsoft Edge
- The coder can add plugins as per their requirement.
DOM is “Document Object Model” which is treemap of all HTML elements in web form loaded by the browser.
We can use The .ready() method provides a way to run a JavaScript code as soon as the page's Document Object Model (DOM) becomes safe to manipulate.
The .hide() method is used for hiding a particular element.
// With the element initially shown, we can hide it slowly:
$( "#clickme" ).click(function() {
$( "#book" ).hide( "slow", function() {
alert( "Animation done." );
});
});
toggle() is an important type of procedure that is used to toggle between the methods of the hide() and show(). It simply attached multiple functions to toggle for the selected elements. You can consider that it shows the hidden elements and hide the shown elements.
Syntax
$(selector).toggle(function)
Development History of jQuery
jQuery was released by John Resig at the BarCamp NYC in January 2006. Currently, it is headed by Timmy Wilson and managed by a team of expert developers.
Latest Version: The most recent version is 3.5.0, which was released on 4th May 2020.
Advantages
- Easy to learn and intuitive
- Deals with many cross-browser bugs
- Clean and simple syntax
- Open source library
- Highly extensible
These jQuery interview questions will help you prepare for your upcoming job interview as well and fast-track your career, whether you are a fresher or an experienced Jquery developer.