CS202 Final Term Short Notes

jQuery

What is jQuery and why it is used?

jQuery is a lightweight, "write less, do more", JavaScript library. The purpose of jQuery is to make it much easier to use JavaScript on your website. jQuery takes a lot of common tasks that require many lines of JavaScript code to accomplish, and wraps them into methods that you can call with a single line of code.

What does jQuery mean?

jQuery is a JavaScript library that allows web developers to add extra functionality to their websites. It is open source and provided for free under the MIT license. ... jQuery can also work with Ajax code and scripting languages, such as PHP and ASP to access data from a database.

What is difference between JavaScript and jQuery?

The main difference among the three is that JavaScript is client-side, i.e., in the browser scripting language, whereas jQuery is a library (or framework) built with JavaScript. ... At the same time, jQuery is a JavaScript framework that makes life easier for people who want to program for the browser.

What are the features of jQuery?

Features of jQuery are :

Effects and animations. Ajax. Extensibility. DOM element selections functions. Events. CSS manipulation. Utilities - such as browser version and the each function. JavaScript Plugins. What is traversing methods in jquery?

With jQuery traversing, you can easily move up (ancestors), down (descendants) and sideways (siblings) in the tree, starting from the selected (current) element. This movement is called traversing - or moving through - the DOM tree.

What are the jQuery events?

Commonly Used jQuery Event Methods

click() The click() method attaches an event handler function to an HTML element. ... dblclick() The dblclick() method attaches an event handler function to an HTML element. ...

How can use two events in jQuery?

You can use bind method to attach function to several events. Just pass the event names and the handler function as in this code: $('#foo'). bind('mouseenter mouseleave', function() { $(this).

What are jQuery effects?

jQuery enables us to add effects on a web page. jQuery effects can be categorized into fading, sliding, hiding/showing and animation effects. jQuery provides many methods for effects on a web page.

What is XML Element?

XML elements can be defined as building blocks of an XML. Elements can behave as containers to hold text, elements, attributes, media objects or all of these. Each XML document contains one or more elements, the scope of which are either delimited by start and end tags, or for empty elements, by an empty-element tag.

What is element and attribute in XML?

Attribute gives more information about XML elements. To be more precise, they define properties of elements. An XML attribute is always a name-value pair. What is jQuery chaining?

However, there is a technique called chaining, that allows us to run multiple jQuery commands, one after the other, on the same element(s).

What is jQuery in HTML?

jQuery is a fast, small, and feature-rich JavaScript library. It makes things like HTML document traversal and manipulation, event handling, animation, and Ajax much simpler with an easy-to-use API that works across a multitude of browsers.

What is jQuery in CSS?

The css() method sets or returns one or more style properties for the selected elements.

What is Dom traversing in jQuery?

jQuery traversing, which means "move through", are used to "find" (or select) HTML elements based on their relation to other elements. ... With jQuery traversing, you can easily move up (ancestors), down (descendants) and sideways (siblings) in the tree, starting from the selected (current) element.

What is DOM traversal?

The Document Object Model (DOM) is a standard convention for accessing and manipulating elements within HTML and XML documents. Elements in the DOM are organized into a treelike data structure that can be traversed to navigate, locate, or modify elements and/or content within an XML/HTML document.

What is jQuery Ajax?

AJAX is an acronym standing for Asynchronous JavaScript and XML and this technology helps us to load data from the server without a browser page refresh. ... JQuery is a great tool which provides a rich set of AJAX methods to develop next generation web application.

What is noConflict in jQuery?

Definition and Usage. The noConflict() method releases jQuery's control of the $ variable. This method can also be used to specify a new custom name for the jQuery variable. Tip: This method is useful when other JavaScript libraries use the $ for their functions.