Comprehensive, community-driven list of essential jQuery interview questions. Whether you're a candidate or interviewer, these interview questions will help.
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- jQuery Interview Questions
- jQuery Interview Questions You'll Most Likely Be Asked
- jQuery Interview Questions You'll Most Likely Be Asked
- 17 Essential jQuery Interview Questions and Answers
For example, the following snippets of code are equivalent:.
Notice that with chaining, the button only needs to be selected one time, whereas without chaining, jQuery must search the whole DOM and find the button before each method is applied. Thus, in addition to yielding more concise code, method chaining in jQuery offers a potentially powerful performance advantage.
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To be entirely precise, it should be noted that method chaining in jQuery is not the only way to avoid repetitively searching the entire DOM. One could also set a variable equal to the initial DOM search results i. This code uses method chaining to accomplish a couple of things. It allows for the creation of highly-customized Ajax requests, with options for how long to wait for a response, how to handle a failure, whether the request is blocking synchronous or non-blocking asynchronous , what format to request for the response, and many more options. Other pre-built Ajax requests are provided by jQuery, such as jQuery.
The first line of code, which is pure JavaScript without jQuery, is more efficient and faster. Executing the second line of code, which is jQuery, will trigger a call to the JavaScript version. It is a good idea to remember that jQuery is not always better than plain old JavaScript. Always consider whether using jQuery really provides a useful advantage for your project.
Explain and contrast the usage of event. It effectively stops parent elements from knowing about an event on their children. Although the stopPropagation and preventDefault methods are mostly used in jQuery event handling implementations, they apply to plain JavaScript as well. What selector would I use to query for all elements with an ID that ends with a particular string? This could be done using the following selector:.
What is accomplished by returning false from a a jQuery event handler, b a regular JavaScript onclick event handler for an anchor tag, and c a regular JavaScript onclick event handler for a non-anchor tag e.
jQuery Interview Questions
What is normally not included in the cloned copy? How can some of this behavior be controlled? Setting the optional withDataAndEvents parameter to true makes copies of all of the event handlers as well, bound to the new copy of the element. As of jQuery 1.
What is an element attribute that you would generally not want to clone? Consider the code snippet below. In the code sample provided, the difference between the start and end times displayed will be 10 seconds. In order to help the system to overcome the conflicts between the different libraries and frameworks the jQuery no-conflict option given by the jQuery. This concept is really advanced which has been developed over the recent times.
In the case of any conflicts which arise between the libraries and frameworks using this jQuery. Explain the concept of fade effect in jQuery? In jQuery there are three different applications applying which we can avail the fade effect. The opacity of elements gets changed with animation through the effect of these methods. Explain the Struts2 jQuery plug-in and its advantages.
The struts2 jQuery plug-in is used to: It greatly reduces the extent of coding needed to be done for a particular action.
jQuery Interview Questions You'll Most Likely Be Asked
It also supports ajax form validation. The readability levels of the code will be very high and so it will become much easier to perform the debugging. Explain how the jQuery stores data related to an element? Information of an element can be stored in the simple javascript by simply adding a domain object model property to the element. This results in the rising of issues such as leakage of memory in the browsers.
jQuery Interview Questions You'll Most Likely Be Asked
But in the case of jQuery the user does not need to be bothered by the memory management issues. Describe the procedure of extracting a query string with regular expressions? The procedure of extracting a query string with regular expressions can be done in two ways. It is considered to be the simplest way in use for extracting a query string with regular expressions. This method is carried ahead by making the utilisation of the.
This is the most powerful method for extracting a query string and the pattern must be used that seeks about the question mark among the string. When done, the JS regular expressions are delimited.
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Differentiate the concepts of. The other name for the deployment version is minified version. Considering the functionality, both the files they are much similar to each other. Being smaller in size, the. In general, CDN can be interpreted as a large system of servers that are deployed in multiple data centers across the internet. CDN is mainly aimed at delivering the content to the end-users by enabling them to have high availability and high performance. The benefits of CDN are quite effective in relation to the working functionality of the jQuery.
17 Essential jQuery Interview Questions and Answers
Some of the benefits of the CDN include. Below is the information that should be present in these notices. It is designed to make submitting notices of alleged infringement to us as straightforward as possible while reducing the number of notices that we receive that are fraudulent or difficult to understand or verify. Copyright Office website, http: To file a notice of infringement with us, you must provide us with the items specified below.
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