Query, at its core, is a Document Object Model DOM manipulation library. The DOM is a tree structure representation of all the elements of a Web page. Query simplifies the syntax for finding, selecting, and manipulating these DOM elements. For example, j. Query can be used for finding an element in the document with a certain property e. Query also provides a paradigm for event handling that goes beyond basic DOM element selection and manipulation. The event assignment and the event callback function definition are done in a single step in a single location in the code. Query also aims to incorporate other highly used Java. Script functionality e. CSS properties. The principles of developing with j. Query are Separation of Java. Script and HTML The j. Query library provides simple syntax for adding event handlers to the DOM using Java. Script, rather than adding HTML event attributes to call Java. Script functions. Thus, it encourages developers to completely separate Java. Script code from HTML markup. Brevity and clarity j. Query promotes brevity and clarity with features like chainable functions and shorthand function names. Elimination of cross browser incompatibilities The Java. Script engines of different browsers differ slightly so Java. Script code that works for one browser may not work for another. Like other Java. Script toolkits, j. Query handles all these cross browser inconsistencies and provides a consistent interface that works across different browsers. Extensibility New events, elements, and methods can be easily added and then reused as a plugin. Historyeditj. Query was originally released in January 2. Bar. Camp NYC by John Resig and was influenced by Dean Edwards earlier css. Query library. 1. It is currently maintained by a team of developers led by Timmy Willison with the j. Query selector engine, Sizzle, being led by Richard Gibson. Query also has an interesting software license history. Originally licensed under the CC BY SA 2. MIT license in 2. At the end of 2. 00. GPL and MIT licenses. As this led to some confusion, in 2. GPL was dropped and is now only licensed under the MIT license. Featureseditj. Query includes the following features DOM element selections using the multi browser open source selector engine Sizzle, a spin off of the j. Query project1. 6DOM manipulation based on CSS selectors that uses elements names and attributes, such as id and class, as criteria to select nodes in the DOMEvents. Effects and animations. Ajax. Deferred and Promise objects to control asynchronous processing. JSON parsing. Extensibility through plug ins. Utilities, such as feature detection. Compatibility methods that are natively available in modern browsers, but need fall backs for older ones, such as in. Array and eachMulti browser not to be confused with cross browser support. Browser supporteditBoth versions 1. Query support current1 versions meaning the current stable version of the browser and the version that preceded it of Firefox, Chrome, Safari, and Opera. Version 1. x also supports Internet Explorer 6 or higher. However, j. Query version 2. Internet Explorer 68 support and supports only IE 9 and later versions. Including the libraryeditThe j. Query library is a single Java. Script 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. Query has a content delivery network CDN hosted by Max. CDN. 1. 8 Google1. Microsoft2. 0 host it as well. It is also possible to include j. Query directly from a CDN lt scriptsrchttps code. FZh. Os. EEamd. OYGBf. Fy. Qui. Twl. AQgx. VSNgt. 4crossoriginanonymous lt script Usage styleseditj. Query has two usage styles Via the function, which is a factory method for the j. Query object. These functions, often called commands, are chainable as they all return j. Query objects. Via. These are utility functions, which do not act upon the j. Query object directly. Access to and manipulation of multiple DOM nodes in j. Query typically begins with calling the function with a CSS selector string. This returns a j. Query object referencing all the matching elements in the HTML page. Query object with all the div elements of class test. This node set can be manipulated by calling methods on the returned j. Query object or on the nodes themselves. No conflict modeeditj. Query also includes. Conflict mode, which relinquishes control of. This is helpful if j. Query is used with other libraries that also use as an identifier. In no conflict mode, developers can use j. Query as a replacement for without losing functionality. Raw 2008 Pc Game Free Download. Typical start pointeditTypically, j. Query is used by putting initialization code and event handling functions in handler. This is triggered when the browser has constructed the DOM and sends a load event. This anonymous function is the first function to be called when the page loads. Query code, event handling callbacks here orfn The function named fn, defined elsewhere, is the first function to be called when the page loads. This is the first function to be called when the page loads. Query code, event handling callbacks here Historically, document. DOM is ready. However, since j. Query 3. 0, developers are encouraged to use the much shorter handler signature. Callback functions for event handling on elements that arent loaded yet can be registered inside. These event handlers will only be called when the event is triggered. For example, the following code adds an event handler for a mouse click on an img image element. Chainingeditj. Query commands typically return a j. Query object, so commands can be chained div. Classblue. slide. Downslow This line finds the union of all div tags with class attribute test and all p tags with class attribute quote, adds the class attribute blue to each matched element, and then increases their height with an animation. The and add functions affect the matched set, while the add. Class and slide. Down affect the referenced nodes. Certain j. Query functions return specific values such as input user email. In these cases, chaining will not work as the value does not reference the j. Query object. Creating new DOM elementseditBesides accessing DOM nodes through j. Lab. 5 Webdesign Programmierung Grafik Lab. Creating Web Programmierung, Scripting, Entwicklung von Sites, Site Applikationen, Apps und offline Applikationen FlashAir. Insbesondere bei der professionellen Entwicklung von webbasierter Software braucht es solides Wissen und Knnen in mehreren Skriptsprachen. Zum Scripting Repertoire gehren unter ander.
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