J query
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This document provides an overview of jQuery, a popular JavaScript library. It discusses what jQuery is, why it's useful, and how to get started using it. Some key points include: - jQuery simplifies common JavaScript tasks like HTML/DOM manipulation, event handling, animations, and AJAX interactions. - It works across many browsers for cross-browser compatibility. - To use jQuery, include the jQuery library file in an HTML document and call jQuery methods inside a document ready event. - jQuery selectors allow selecting elements using CSS-like syntax for then manipulating elements. - Common uses of jQuery include building forms, menus, sliders, games and more.
J query
- 2. Disclaimer: This presentation is prepared by trainees of baabtra as a part of mentoring program. This is not official document of baabtra –Mentoring Partner Baabtra-Mentoring Partner is the mentoring division of baabte System Technologies Pvt . Ltd
- 3. jQuery Validation Atheendrh Kakkothh atheendrh@gmail.com www.facebook.com/atheend rhkakkoth twitter.com/username in.linkedin.com/in/atheendr h kakkoth 9633734876
- 5. What is jQuery? • JavaScript Library • 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 • The jQuery library contains the following features: HTML/DOM manipulation CSS manipulation HTML event methods Effects and animations AJAX
- 6. Why jQuery? • Cross-browser support (IE 6.0+, FF 1.5+, Safari 2.0+, Opera 9.0+) • CSS-like syntax – easy for developers/nondevelopers to understand • Active developer community
- 7. JQuery • Powerful JavaScript library – Simplify common JavaScript tasks – Access parts of a page • using CSS or XPath-like expressions – – – – – – Modify the appearance of a page Alter the content of a page Change the user’s interaction with a page Add animation to a page Provide AJAX support Abstract away browser quirks
- 9. Using jQuery • Adding jQuery to Your Web Pages There are several ways to start using jQuery on your web site. You can: Download the jQuery library from jQuery.com Include jQuery from the file <head> <script src="jquery-1.10.2.min.js"></script> </head>
- 10. The Document Ready Event • You might have noticed that all jQuery methods in our examples, are inside a document ready event: $(document).ready(function(){ // jQuery methods go here... }); • • This is to prevent any jQuery code from running before the document is finished loading (is ready). This also allows you to have your JavaScript code before the body of your document, in the head section.
- 11. jQuery Selectors • jQuery selectors allow to select and manipulate HTML element(s). • jQuery selectors are used to "find" (or select) HTML elements based on their id, classes, types, attributes, values of attributes and much more. It's based on the existing CSS Selectors, and in addition, it has some own custom selectors. • All selectors in jQuery start with the dollar sign
- 12. The element Selector jQuery element selector selects elements based on the element name. You can select all <p> elements on a page like this: $("p") The #id Selector The jQuery #id selector uses the id attribute of an HTML tag to find the specific element. An id should be unique within a page, so you should use the #id selector when you want to find a single, unique element. To find an element with a specific id, write a hash character, followed by the id of the element: $("#test") The .class Selector The jQuery class selector finds elements with a specific class. To find elements with a specific class, write a period character, followed by the name of the class: $(".test")
- 13. What are Events? • All the different visitor's actions that a web page can respond to are called events. • An event represents the precise moment when something happens. • Examples: moving a mouse over an element selecting a radio button clicking on an element Click() event $("p").click(function(){ $(this).hide(); });
- 14. Form.php
- 17. jQuery Animations • Animations • Built in – – – – – – – – – – fadeIn() fadeOut() hide() show() slideDown() slideUp() toggle() slideToggle() fadeTo() animate() • See also: – Easing Plug-in – jQuery User Interface: http://ui.jquery.com
- 18. Who’s using jQuery? • • • • • • Google Dell Bank of America Mozilla NetFlix NB
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