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JQuery is a client-side scripting language and this is based on HTML DOM or Document Object Model that is designed to simplify the HTML and CSS scripting. A number of companies are adopting JQuery for their organizational applications and therefore the requirement for JQuery professionals is also increasing in the market. If you are also planning to start your career in IT then JQuery is just the best option for you.
In this blog, we are going to discuss JQuery and commonly asked interview questions for this profile. As it is one of the most in-demand scripting languages, so we have collected all of the relevant and common questions that are usually asked by the interviewers to JQuery professionals:
JQuery is compatible only with HTML documents and cannot work with XML documents.
Following listed methods can provide effects:
In JQuery we can use $() at the place of jQuery () function so it is an alias of jQuery () function. Initially, you may feel it not suitable and appropriate but when you will become familiar with this function then you will surely love it. Any object can be wrapped under $() function, it can then be used to call the functions that are defined through jQuery object. A selector string can also be passed to $() function that will return of an array of all of the matching DOM elements of JQuery.
JQuery offers following advantages over other scripting languages that are:
Read: What is A Java Constructor? Type of Constructors & Uses in Java
The difference may be clear to the XML users and the same difference is there in JQuery as well between both. The elements can be selected by ID selector that uses element ID to select them like #element1 and to select only one element you can use ID selector.
To select a group of elements from same CSS class you can use a class selector. If you are being asked to tell the difference between syntax of ID selector and class selector then the difference is that ID selector use ‘#’ while class selector use “.” character.
If you are a beginner then this question may be somewhat trickier for you, but otherwise, it is not a difficult one. $(this returns a jQuery object for which several jQuery methods can be called like eval () to call value, text () to retrieve text.
For JQuery beginners, it can be slightly advance question, but usually, the jQuery library is loaded by CDN because It is quite faster to download and in case if the browser has already downloaded the same jquery then it will not be downloaded again. Today most of the websites use JQuery for animation and user interaction, so your browser may have already downloaded jQuery.
In jQuery class is a style or group of CSS attributes and can be applied to one or more HTML elements. In other words, it can be applied to the instance of same or different objects to which the same style is attached. JQuery classes are defined by periods that is followed by the class name. Usually with the help of class name and class attributes it is applied to an HTML element.
ID selectors are applied to a specific style of JQuery. It can be associated with one HTML element with an assigned ID. The ID selectors are defined by # in CSS that is followed by the selector name.
When the same declaration is used by more than one selectors then they can be grouped together and are separated by a comma. In this way, CSS size can be reduced (As in programming every byte and bit is important) and can be made readable.
Read: What are the Benefits of loading jQuery from CDN
HTML stands for Hyper Text Mark-up Language that is a language of World Wide Web. This is a language of standard text formatting that is used to design a web page. HTML web pages are designed with the help of two things one is content and other is a tag, that is used for proper page display.
Semantic HTML is not much different but is just a style of coding and in that tags embody what text is meant to convey. In semantic HTML some of the syntaxes for tags may be different than usual HTML syntaxes.
Windows, Linux and Mac operating systems are more compatible with JQuery.
We can use JQuery in following scenarios:
Following questions are asked of the experienced candidates of JQuery professionals:
If we want to connect one or more function with each other than for that purpose JQuery connect plugin is used. If we want to execute one function from another function then we can use Connect plugin.
We can use Connect plugin by downloading JQuery connect file from jQuery.com and then we can include it in the HTML file. The $. Connect function can be used to connect two or more functions.
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The big issue with JQuery browser is the compatibility that may need a lot of time in fixing.
The basic JQuery selectors are listed below:
By length and size, we can get the total number of elements of JQuery object. They are usually used to loop arrays, object properties, and DOM elements.
The four parameters that are used with JQuery Ajax methods are:
The content distribution network is known as CDN. Group of companies from different locations and network contains the data file copies that are used to maximize the bandwidth so that data can be easily accessed. Following two types of CDN can be used by the programmers:
Following two ways are used for debugging in JQuery:
In this way, we can see that the number of questions that are asked by the interviewer in JQuery interviews can be of many types and the difficulty level will depend on your experience level.
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