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  • 1. jQuery
    Jon Erickson
  • 2. What is jQuery?
    JavaScript framework that makes your life easier
    Selectors & Chaining
    DOM Traversing
    DOM Manipulation
    Event Handling
    Built-in Utilities
    Tons of plug-ins built by the community for our use
  • 3. Why jQuery?
    I’m not an expert at JavaScript
    The people who created jQuery are!
    Do not need to worry about cross-browser issues (all abstracted)
    Light Weight (19 kb compressed)
    DRY – Simple plug-in model allows for code reuse
    Animations/Effects are simple
    Community support is growing rapidly
    Microsoft adoption (included in MVC template)
    Tutorials, plug-ins, etc.
    Client-side scripting is fun with jQuery and breathes some new life into your applications
    Focus more on the code that solves your problem
    Amazon, BBC, Dell, Google, IBM, NBC, Netflix, Twitter
  • 4. Sample jQuery
    Our DOM
    Include jQuery
    The ‘ready event’ – Binds a function to be executed whenever the DOM is ready
    Select the ‘toggleContent’ DOM element and bind a click event handler to it.
    Select the ‘content’ DOM element and set the text to ‘Hello World!’
    Prevent the default behavior of the anchor tag by returning false
  • 5. Dollar Function $();
    JavaScript identifiers can start with $
    The jQuery framework automatically assigns ‘$’ to the ‘jQuery’ function
    $ === jQuerytrue
    $(selector) is same as jQuery(selector)
    Can use utility function to unassign $
    $ === jQuery; false
    Can reassign jQuery to another variable
    $j = $.noConflict();
    $j === jQuery; true
    $j === $; false
    $ === jQuery; false
  • 6. Document Ready Event
    The bound function will be called the instant the DOM is ready to be read and manipulated.
    As many as you want on the page.
    Executed in the order they were added.
    There is a shortcut: $(fn);
  • 7. Selectors
    CSS3 Selectors
  • 8. Filters
    $(‘div:empty’), $(‘:empty’), $(‘div:not(:empty)’)
    Custom Filter Used
  • 9. Chaining
    Most jQuery methods return another jQuery object (usually the same collection), which means you can chain method calls together with a fluent like syntax
    Some methods that stop a chain, these methods return a value from the jQuery object
    .css(name), .text(), .html(), .val(), .height(), .width(), .is(‘:visible’)
    Some methods will return a different jQuery collection, you can revert to the previous collection by calling .end();
  • 10. Attributes & Classes
    Getters & Setters for attr, html, text, val
    Getter (returns String – breaks chain)
    var text = $(‘#myDiv’).text();
    Setter (returns jQuery)
    $(‘#myDiv’).text(‘Hello World!’);
    text() escapes html()
    val() used with inputs
    attr() can take JSON
    Add, Remove for Attributes & Classes
  • 11. Traversing
    parent, parents, siblings, children
    closest, next, prev, nextAll, prevAll
  • 12. Events
    .bind(type, data, fn)
    • Binds a handler to an event on all matched elements
    .one(type, data, fn)
    • Binds a handler to be executed only once for each matched element
    .trigger(event, data)
    • Trigger an event to occur on all matched elements
    .unbind(type, fn)
    • Removes event handlers from all matched elements
    .live(type, fn)
    • Binds a handler to an event on all currently matched and future matched elements.
    .die(type, fn)
    • Removes a bound live event.
    .hover(fnOver, fnOut)
    • Interaction helper that will handle mouseover and mouseout
    .toggle(fn1, fn2, fn3, fnN, …)
    • Interaction helper that will toggle among two or more function calls every other click.
  • Event Helpers
    blur, change, click, dblclick, error, focus, keydown, keypress, keyup, load, mousedown, mouseenter, mouseleave, mousemove, mouseup, resize, scroll, select, submit, unload
  • 13. Manipulation
    Inserting Inside
    append, prepend
    appendTo, prependTo
    Inserting Outside
    after, before
    insertAfter, insertBefore
    Inserting Around
    replaceWith, replaceAll
    empty, remove
  • 14. Effects
    show, hide, toggle
    slideUp, slideDown, slideToggle
    fadeIn, fadeOut, fadeTo (opacity 0-1)
    animate, stop
  • 15. Plug-ins
    Extremely Simple – Promotes code reuse and DRY principle
    $.fn.MyPlugin = function(params) {};
    Return a jQuery object to prevent from “breaking the chain”
    Unless you are returning a specific value
    Best Practice is to wrap the plug-in declaration within an anonymous JavaScript function in order to prevent collisions with the use of $
    Within the plug-in ‘this’ refers to the jQuery object
  • 16. AJAX
    load, get, getJSON, getScript, post (all use $.ajax behind the scenes)
    $.ajaxSetup(options) can be used to globally set the default options for all AJAX request. You can still override these within each AJAX request object.
    Local Events – subscribed to within AJAX request object
    Global Events – broadcast to all elements in the DOM
    Can be disabled within the AJAX request object’s ‘global’ property
    .bind(‘ajaxStart’, fn) or .ajaxStart(fn)
    G | ajaxStart
    L | beforeSend
    G | ajaxSend
    L | success
    G | ajaxSuccess
    L | error
    G | ajaxError
    L | complete
    G | ajaxComplete
    G | ajaxStop
  • 17. Utility Functions
    Array and Object Operations
    $.each(object, callback) – Callback function will run for each item in the object. The each method is meant to be an immutable iterator and returns the original array.
    $.map(array, callback) – Callback function will run for each item in the array. The map method can be used as an iterator, but is designed to be used for manipulation of the supplied array and returns a new array.
    $.merge(first, second) – Merges the second array into the first array.
    $.unique(array) – Removes duplicate elements (only works on arrays of DOM elements).
    $.extend(object) – Add functions into the jQuery namespace.
    $.extend(deep, target, object1, objectN) – Merge values from objects 1 to N into target object. Deep is an optional boolean that if true, tells jQuery to do a deep copy.
    $.grep(array, callback, invert) – Iterates through array, and returns a new array with values from the original array that satisfy the criteria specified in the callback.
    $.inArray(value, array) – Gets the index of the value in the array (-1 if not found).
    String Operations
    $.trim(str) – Removes whitespace from the given string.
    Test Operations
    $.isArray(obj) – Determines if the object is an array.
    $.isFunction(obj) – Determines if the object is a function.
  • 18. jQuery Data
    Can store data on one or more jQuery elements
    .data(name, value)
    value is an object
    Retrieves data from the first element in the jQuery object
  • 19. Resources
    jQuery Main
    jQuery API Documentation
    jQuery UI
    jQuery Blog
    Around The Web
    Visual Studio JavaScript Intellisense Support (KB958502)
    http://getfirebug.com/ (Firebug Firefox Plug-in)
    http://jsbin.com/ (JS Bin - Collaborative JavaScript Debugging)
    @jquery, @jqueryui, @jresig, @rem, @codylindley , @reybango, @elijahmanor, @jamespadolsey, @brandonaaron, @malsup, @pbakaus, @rworth