jQuery Interview Questions and Answers

If you are applying for posts like web designer, web developer, front-end developer then you must prepare for jQuery interview questions and answers. Today we will know about jQuery questions which are mostly asked in interview or viva. In addition to jQuery, JavaScript, HTML questions And CSS questions etc. can also be asked, so you should prepare for them also. Let’s look at the questions and answers related to jQuery for the time being.

jQuery Interview Questions and Answers in Hindi

1. What is jQuery?

jQuery is a lightweight Javascript There is library. The purpose of making jQuery is to make JavaScript easy to use on your website. This simplifies the lengthy code in JavaScript. It is very easy to learn and use.

read: What is jQuery? What are its advantages?

2. What are the advantages of jQuery?

  • Easy to learn and use: The syntax of jQuery is very simple, due to which it is easy to learn and implement.
  • Time Saving: If you have to write many lines of code in Javascript, whereas in jQuery you can do many things with only a few lines of code, it saves time.
  • Cross browser compatibility: The team that made jQuery works the same in every browser, has taken full care of this cross browser compatibility.
  • Large library: You can further enhance the features of jQuery by using plugins.
  • Available for free: It is absolutely free and open source.
  • Ajax support: You can also use the features of Ajax with jQuery.

3. Difference between jQuery and JavaScript?

  • JavaScript is a complete programming language Whereas jQuery is a framework for it.
  • jQuery is a type of library written in the JavaScript language.
  • Long code has to be written in JavaScript, but in jQuery, functions are called by importing only one library file.
  • jQuery has cross browser compatibility in-built whereas in JavaScript it has to be manually coded.

4. Is jQuery a programming language?

jQuery is not a programming language but it is a JavaScript library.

5. Is jQuery Sever Side Scripting or Client Side?

This is client side scripting which is executed in the user’s browser. When the website is loaded, the jQuery codes are run in the browser.

Read: What is Scripting Language? What is the difference between scripting and programming?

6. Where does the code begin in jQuery?

The $(document).ready() function starts the jQuery code.

7. How to use jQuery in a web page?

For this, first you have to download the jQuery file from the official website of jQuery. Then that file has to be included in the head section of the HTML page by the code given below.

<head>
<script src="https://webinhindi.com/jquery-interview-questions-and-answers-in-hindi/jquery.js"></script>
</head>

8. What is Event in jQuery?

We define through event when a function will be executed in jQuery. The most commonly used events are as follows:

  • Click Event
  • Double Click
  • Focus
  • Mouseover

When the user performs the above events, the defined functions are executed.

9. What is DOM?

The full form of DOM is Document Object Model. When the HTML page is completely loaded, all the elements form a kind of tree structure, which is called DOM.

We execute the functions of jQuery only after the DOM is completely loaded and for this we have to write code like this:

$(document).ready(function() {
       // All your jQuery codes here.
});

10. How many types of Selectors are there in jQuery?

In jQuery, any HTML element is selected through selectors and the effect is applied to it.

Like CSS selectors, jQuery also has many selectors. Let us know about some basic selectors:

  • Type: In this, the HTML element can be selected by its name. ex: $(“a”)
  • Class: It is used to select all the elements which match the given class. ex: $(“.class_name”)
  • ID: It is used to select any one element that matches the given ID. ex: $(“#id_name”)
  • Attribute: It is used to select an element based on the attribute value. Ex: $(“[href=’index.html’],

Read: CSS Selectors in Hindi – What are Selectors?

11. What is the difference between ID selector and Class selector in jQuery?

There is not much difference between ID and Class where ID is for selecting only one element, whereas with Class you can select multiple elements.

12. What is the use of HTML() method in jQuery?

The jQuery HTML() method is used to replace the entire content of the selected element.

$(document).ready(function(){    
    $("button").click(function(){    
        $("p").html("Namaskar! <b>WebinHindi.com</b>");    
    });    
});    

13. What is the use of CSS() method?

Using CSS() in jQuery, you can find the CSS property and its value of the selected elements or set its value.

Example: Knowing the value of CSS property (return) –

$(document).ready(function(){    
    $("button").click(function(){    
       alert("Font color of <p> element is = " + $("p").css("color"));    
    });    
});    

Example: Setting the value of CSS property –

$(document).ready(function(){    
    $("button").click(function(){    
        $("p").css("color", "red");    
    });    
}); 

14. Can we write something else instead of $ (dollar sign) in jQuery?

Yes, instead of “$” we can also write “jQuery”. See example:

jQuery(document).ready(function() {    
jQuery("p").css("color", "red");    
});   

15. What are the effect methods in jQuery?

Some of the basic effect methods used in jQuery are as follows:

  • hide() : With this the selected element can be hidden.
  • show(): This shows the hidden element.
  • toggle(): With this method both hide and show the element can be done.
  • fadeIn(): It is used to add a fading effect to the element, that is, to gradually hide it.
  • fadeOut(): Shows the element hidden by fadein().
  • slideDown(): To slide an element down
  • slideUp(): To slide up an element.
  • slideToggle(): To toggle slideDown() and slideUp().
  • animate(): With this you can create animation.
  • stop(): You can stop the animation while running with this method.

16. What are the benefits of using the minimized version of jQuery?

The minimized version of jQuery (jquery.min.js) is used because it is lightweight and loads quickly on the website.

17. What is the difference between jQuery find() and children() method?

find() can search all the elements lower down in the DOM tree whereas children() can search only one level below.

18. What is the use of each() ?

Each() function in jQuery is used as a loop so that the function can be executed for multiple elements with the same selector. This is a very popular method for traversing in jQuery.

Example: For example, if we want to add width=”500″” attribute to all the images of a web page, then we have to write code like this:

$("img").each(function(){
    $(this).attr("width","600")
});

19. Can jQuery support both HTML and XML documents?

No, jQuery only works on HTML documents.

20. What is CDN?

The full form of CDN is Content Delivery Network which is a system of many powerful distributed servers. These servers allow downloading files with high bandwidth, which increases the loading speed of the website. Some of the companies that provide Free CDN on the Internet are:

21. Which method is used to add and remove CSS class in an element?

AddClass() is used to add a CSS class to an HTML element through jQuery, while the CSS class can be removed with the removeClass() method.

22. What is the difference between prop() and attr() ?

The value of the attribute of the first element can be found out of the matched elements with attr(). Whereas the value of the property of the element can be found before prop().

read ahead:

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