JQuery Interview Questions


jQuery is a fast, lightweight and concise JavaScript library that supports all browsers. It is easy to play with DOM, event handlings, animations, and AJAX interactions for fast web development with jQuery. Its slogan "minimal lines of code" helping the developers to write a few lines of code to do the most things. Moreover, jQuery is active and "rival" cooperation. It seems to be in the overall development of JavaScript, not just to one's private ends.

    Today, the whole world is embracing the jQuery, companies such as IBM, Microsoft and Google are already using it. jQuery open source project is also running for adding more features in the library. This shows that jQuery will run for a long time. To know completely about jQuery, check our jQuery online interview questions. These interview questions will help you to clear all your doubts and to crack any interviews. Get a look!

    Which is better?

    It is a JavaScript library It is a JavaScript toolkit. JQuery is licensed by MIT. The dojo is licensed by BSD or AF. It was started at Rochester Institute of Technology in January 2006 by John Resig.It was released in 2004 by Dylan Schiemann, David Schontzler and Alex Russell.
    JQuery presents User Interface libraries with many beneficial functionalitiesDojo toolkit provides the features of a widget toolkit.
    JQuery is used mostly for web application and dynamic web pages.Dojo is used for web-oriented software on desktop, mobile and internet applications.
    JQuery is being used by WordPress, BackBone, Wikipedia, etc.Dojo is being used by internet browsers like Internet Explorer, Google Chrome, Safari, etc.
    JQuery is lightweight with 19K compressed base libraries.Dojo provides many customizing choices but it is a massive and complex toolkit.
    JQuery requires a less network bandwidth than Dojo.Dojo requires a higher network bandwidth than JQuery.

    Advantage of jQuery:

    • Open source library: JQuery is an open source library for all types of application. What a developer wants more than this, anyone can use it for their applications without any license or agreement issues.
    • Lightweight: The size of the jQuery core library is just 24kb which can be easily added to any application and hence, increase the performance. The reason behind the lightweight jQuery library is limited functions. Some functions are omitted from the library and some are transferred to plug-ins. So that whenever these functions required, developers can add those plugins in their applications.
    • Limited Coding level: As the slogan of jQuery “few lines of code, do the most things” explains by itself. The use of advanced selectors in jQuery lets the developers write just a few lines of code and obtain the desired result. Thus, jQuery took the JavaScript to a higher level.
    • Browser compatibility: It is the utmost advantage of jQuery, as this is the biggest problem that any developer face in other designs. For example, in JavaScript, when you write code for one browser, it may not run on another browser properly. So, the designers of jQuery fixed this problem and help the developers to write the same code for all browsers.
    • Plug-ins: jQuery provides the thousands of plug-ins to perform the tasks such as validation, animation, field prompt and many more. It doesn't stop here; you can also create your own plug-ins and also can share with other developers. To create the plug-in is very simple, just use the framework given to extending the library.
    • Flexible: jQuery is compact but easy to learn. If you want to understand jQuery, then you just need to give a little bit of your time. You will be able to write the codes and independent widgets very easily after going through a short tutorial on jQuery.
    • jQuery is a fun: jQuery is very powerful and precise language. Using jQuery for programming gives you the desired result very quickly. It solved the many challenges and issues of JavaScript. Many fundamental tools are improved and many new are designed which developers can use to generate next level web applications.
    • Animations: You can easily avail cool effects such as contrast/expand, fade out, etc. in designing the application by writing just a couple of lines of code.

    Disadvantages of jQuery:

    • Limited Functionalities: In spite of the powerful library, but sometimes it is necessary to use the raw JavaScript. Functionalities may be limited that depends on how much personalization; you want in your application.
    • Backward compatibility: Sometimes, the new version is not compatible with the previous version. For instance, the newer version has removed some selectors which are previously widely used. This may confine the developers to upgrade their application from an old version to a newer one.
    • Plugins compatibility: Similar to backward compatibility, developers need to check the plugins supported by the newer version before upgrading. Sometimes, the existing plugins are not supported by the newer versions at all. Also, while using multiple plugins on the same page, can encounter some conflicts.