J query resh


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This is a powerpoint presentation about JQuery By Haresh C. Mahtani Jr.

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J query resh

  2. 2. • What is JQuery • is free, open source software licensed under the MIT License. jQuery's syntax is designed to make it easier to navigate a document, selectDOM elements, create animations, handle events, and develop Ajax applications. jQuery also provides capabilities for developers to create plug-inson top of the JavaScript library. This enables developers to create abstractions for low-level interaction and animation, advanced effects and high- level, theme-able widgets. The modular approach to the jQuery library allows the creation of powerful dynamic web pages and web applications JQuery
  3. 3. • Features of Jquery • DOM element selections using the multi-browser open source selector engine Sizzle, a spin-off of the jQuery project • DOM traversal and modification (including support for CSS 1–3) • DOM manipulation based on CSS selectors that uses node elements name and node elements attributes (id and class) as criteria to build selectors • Events • Effects and animations • AJAX • Extensibility through plug-ins • Utilities - such as user agent information, feature detection • Compatibility methods that are natively available in modern browsers but need fall backs for older ones - For example the inArray() and each() functions. • Multi-browser (not to be confused with cross-browser) support. JQuery
  4. 4. • The jQuery library is a single JavaScript file, containing all of its common DOM, event, effects, and Ajax functions. It can be included within a web page by linking to a local copy, or to one of the many copies available from public servers. jQuery has a CDN sponsored by Media Temple(previously at Amazon). Google and Microsoft host it as well. The JQuery Library
  5. 5. <script type="text/javascript" src="jquery.js"></script> • It is also possible to include jQuery directly from content delivery networks. <script src="http://ajax.googleapis.com/ajax/libs/j query/1.9.1/jquery.min.js"></script> Examples of How to include JQuery
  6. 6. • jQuery has two usage styles: • Via the $ function, which is a factory method for the jQuery object. These functions, often called commands, are chainable as they all return jQuery objects. • Via $.-prefixed functions. These are utility functions, which do not act upon the jQuery object directly. Usage Styles
  7. 7. • This is an example of a jquery being use to add manipulation of multiple DOM nodes beginning in a $ function being called with a CSS selector string which results in a Jquery object referencing matching elements in an HTML Examples of a Jquery
  8. 8. • Besides accessing DOM nodes through jQuery object hierarchy, it is also possible to create new DOM elements if a string passed as the argument to $() looks like HTML. For example, this line finds an HTML SELECT element with ID="carmakes", and adds an OPTION element with value "VAG" and text "Volkswagen" • $("div.test").add("p.quote").addClass( "blue").slideDown("slow"); Examples of a JQuery
  9. 9. • the methods prefixed with $. are convenience methods or affect global properties and behaviour. • $('select#carmakes').append($('<option />').attr({value:"VAG"}).append("Volkswage n")); Examples of a JQuery
  10. 10. • This writes "234" to the document. • $.each([1,2,3], function() { document.write(this + 1); }); Examples of a JQuery
  11. 11. • This example posts the data name=John and location=Boston to example.ph p on the server. When this request finishes successfully, the success function is called to alert the user. If the request fails, it will alert the user to the failure, the status of the request, and the specific error. $.ajax({ type: "POST", url: "example.php", data: "name=John&location=Boston" }).done( function(msg) { alert( "Data Saved: " + msg ); }).fail( function( xmlHttpRequest, statusText, errorThrown ) { alert( "Your form submission failed.nn" + "XML Http Request: " + JSON.stringify( xmlHttpRequest ) + ",nStatus Text: " + statusText + ",nError Thrown: " + errorThrown ); }); Examples of a JQuery
  12. 12. • JQuery's architecture allows developers to create plug-in code to extend its functionality. Currently there are thousands of jQuery plug-ins available on the web that cover a wide range of functionality such as Ajax helpers, web services, datagrids, dynamic lists, XML and XSLT tools, drag and drop, events, cookie handling, modal windows, and even a jQuery- based Commodore 64emulator. jQuery plug-ins
  13. 13. • Wikipedia • http://en.wikipedia.org/wiki/JQuery Reference