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
When a radio button is selected addition check attribute is not added to it. You have to enter "checked".
$(document).ready(function(){
$("input[type='button']").on('click', function(){
var radioValue = $("input[name='gender']:checked").val();
if(radioValue){
alert(radioValue);
}
});
});
You can use window.location="https://www.bestinterviewquestion.com";
You can also use window.location.href = "https://www.bestinterviewquestion.com";
| setTimeout() | setInterval() |
|---|---|
| It runs the code with the timeout. This function executes the JavaScript statement "AFTER" interval. | It runs the code in fixed time intervals depending upon the length of their timeout period. |
setTimeout(expression, timeout); |
setInterval(expression, timeout); |
1. Set a cookie
$.cookie("example", "foo"); // Sample 1
$.cookie("example", "foo", { expires: 7 }); // Sample 2
$.cookie("example", "foo", { path: '/admin', expires: 7 }); // Sample 3
2. Get a cookie
alert( $.cookie("example") );
3. Delete the cookie
$.removeCookie("example");
parent() method refers to top-level elements in given HTML objects, usually selected by jQuery selector. Parent method is used to manipulate changes to be done at the top level of a nested HTML object.
Example: A paragraph which contains a couple of list elements can be a parent. Usually, Parent is used if there is an action based on the child element or if there is any specific need for a parent to be treated differently.
$(document).ready(function(){
$("span").parent().css({"display": "block", "border": "1px solid red"});
});
ParseInt() is a method in Java that is used to convert the numbers represented as a string. These numbers are an integer type, and through this method, the string gets converted to an integer.
ParseInt() is used to parse the string and returns it to an integer.
syntax
parseInt(string, radix)
You have to develop the HTML form with adding jQuery. After writing some validation, proceed with the submission.
$("#bestinterviewquestion").submit(); // using jQuery
document.getElementById("bestinterviewquestion").submit(); // using JavaScript
By including @ and following the email naming standards, email can be validated using jQuery.
function validateEmail(sEmail) {
var filter = /^([\w-\.]+)@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([\w-]+\.)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$/;
if (filter.test(sEmail)) {
return true;
} else {
return false;
}
}
We can use regex ([0-9]{10})|(\([0-9]{3}\)\s+[0-9]{3}\-[0-9]{4})
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.