Jquery Interview Questions
Jquery Interview Questions
Jquery Interview Questions
JQuery is a popular JavaScript library that simplifies client-side scripting by providing a user-friendly and efficient way to interact with HTML elements, make AJAX requests, handle events, and manipulate DOM elements. During a JQuery interview, candidates may be asked about their knowledge of basic JavaScript concepts, such as variable declaration, event handling, and data types, as well as their understanding of JQuery syntax and functions. They may also be expected to demonstrate their problem-solving skills by designing and implementing solutions to common front-end development challenges. Additionally, candidates may be asked about their experience with jQuery plugins, asynchronous programming, and cross-browser compatibility.
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1 - What is the difference between document.ready() and window.onload() functions in jQuery?
The document.ready() function executes when the HTML document is loaded and the DOM is ready, while the window.onload() function executes when all the content (including images) of the page is loaded. This means that document.ready() will execute faster as it doesn't wait for images to load.
2) What is the purpose of jQuery.noConflict() method?
This method is used to prevent conflicts with other libraries that use the $ variable as a shortcut for their own library. It returns the control of the $ variable back to the other library, allowing both libraries to work together on the same page.
3) How do you select elements with a specific class in jQuery?
The jQuery selector for selecting elements with a specific class is $(“.classname”).
4) What is event propagation in jQuery?
Event propagation is also known as event bubbling. It is a mechanism in which an event is first handled by the inner most element and then propagated to its parent elements in the DOM tree. This means that the event will be handled by all the parent elements of the target element.
5) How do you stop event propagation in jQuery?
To stop event propagation, we can use the event object's stopPropagation() or stopImmediatePropagation() methods. These methods prevent the event from bubbling up to the parent elements or to other event handlers registered on the same element.
6) Explain .slideDown() and .slideUp() methods in jQuery.
These methods are used to create an animation effect where an element slides down or up. The .slideDown() method displays the element by increasing its height from 0 to the specified height, while the .slideUp() method hides the element by decreasing its height from the specified height to 0.
7) What is the difference between .attr() and .prop() methods in jQuery?
The .attr() method is used to get or set the value of an attribute on an element, while the .prop() method is used to get or set the value of a property on an element. The main difference is that attributes are defined in HTML, while properties are defined in the DOM.
8) How do you handle errors in AJAX requests in jQuery?
We can use the error() method in the AJAX settings to handle any errors that occur in the request. This method takes a function as an argument which is executed when an error occurs. Additionally, we can also use the .fail() method to handle errors in the AJAX request.
9) What is the difference between .empty() and .remove() methods in jQuery?
The .empty() method removes all child elements and their content from the selected element, while the .remove() method not only removes the child elements but also removes the selected element itself from the DOM.
10) How do you set a custom animation in jQuery?
To set a custom animation in jQuery, we can use the .animate() method. This method takes CSS properties and their values as arguments and creates an animation effect by gradually changing the selected element's style.
11) What is the use of .each() method in jQuery?
The .each() method is used to loop through each element in a jQuery object. It takes a function as an argument which is executed for each element in the object. This method is useful for performing the same action on multiple elements, such as adding a class to each element.
12) How do you disable/enable a form element in jQuery?
We can use the .prop() method to change the disabled property of a form element and make it disabled or enabled. The syntax is $(“elem”).prop(“disabled”, true/false).
13) What is event delegation in jQuery?
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Event delegation is a technique in which we attach event handlers to a parent element instead of individual child elements. This allows us to handle events on dynamically added elements as well, thus improving performance as we only have one event handler instead of multiple.
14) What is the use of .serialize() method in jQuery?
The .serialize() method is used to encode form element values into a string that can be sent in an AJAX request. This method takes form element IDs, classes, or names as arguments and encodes all of their values into a string.
15) What is the difference between .html() and .text() methods in jQuery?
The .html() method returns the HTML content of the selected element, while the .text() method returns the text content without any HTML tags. It is important to note that the .text() method does not retrieve or set the value of form elements, while .html() does.
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