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Dive Into JavaScript Events

Goddy Zhao
September 03, 2012

Dive Into JavaScript Events

Describe the internal mechanism of JavaScript Events!

Goddy Zhao

September 03, 2012
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  1. Dive Into Javascript Event
    澄净
    [email protected]
    Monday, September 3, 12

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  2. Dive Into Javascript Event
    澄净
    [email protected]
    Monday, September 3, 12

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  3. Monday, September 3, 12

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  4. Outline
    Event Type
    Event Mechanism
    Implement an Event Library
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  5. Monday, September 3, 12

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  6. Event Type
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  7. Interface Events
    Event Type
    scroll resize focus blue ...
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  8. Interface Events
    Event Type
    Mouse Events
    scroll resize focus blue ...
    mouseover mouseout ...
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  9. Interface Events
    Event Type
    Mouse Events
    scroll resize focus blue ...
    mouseover mouseout ...
    Form Events submit reset ...
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  10. Interface Events
    Event Type
    Mouse Events
    scroll resize focus blue ...
    mouseover mouseout ...
    Form Events submit reset ...
    W3C Events dom manipulation...
    Monday, September 3, 12

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  11. Interface Events
    Event Type
    Mouse Events
    scroll resize focus blue ...
    mouseover mouseout ...
    Form Events submit reset ...
    W3C Events dom manipulation...
    Microsoft Events mouseenter mouseleave...
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  12. Monday, September 3, 12

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  13. Mouse Event
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  14. Mouse Event
    click
    dblclick
    mouseover
    mousedownmousemove mouseout
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  15. Mouse Event
    click
    dblclick
    mouseover
    mousedownmousemove mouseout
    mouseenter mouseleave
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  16. Monday, September 3, 12

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  17. Mouse Event
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  18. Mouse Event
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  19. Monday, September 3, 12

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  20. Event Mechanism
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  21. Event Mechanism
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  22. Event Mechanism
    Click
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  23. Event Mechanism
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  24. Event Mechanism
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  25. Event Mechanism
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  26. Event Mechanism
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  27. Event Mechanism
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  28. Event Mechanism
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  29. Event Mechanism
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  30. Event Mechanism
    Event Mechanism
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  31. Event Mechanism
    Event Registration
    Event Mechanism
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  32. Event Mechanism
    Event Registration
    Event Mechanism
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  33. Event Mechanism
    Event Registration
    Event Mechanism
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  34. Event Mechanism
    Event Registration
    Event Mechanism
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  35. Event Mechanism
    Event Registration
    Event Mechanism
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  36. Event Mechanism
    Event Registration
    Event Mechanism
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  37. Event Mechanism
    Event Registration
    Event Mechanism
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  38. Event Mechanism
    Event Mechanism
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  39. Event Mechanism
    Event Registration
    Event Mechanism
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  40. Event Mechanism
    Event Registration
    Event Mechanism
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  41. Event Mechanism
    Event Mechanism
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  42. Event Mechanism
    Attention!
    Event Mechanism
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  43. Event Mechanism
    Attention!
    Event Mechanism
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  44. Event Mechanism
    Attention!
    Event Mechanism
    Same Parameters?
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  45. Event Mechanism
    Attention!
    Event Mechanism
    Same Parameters?
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  46. Event Mechanism
    Attention!
    Event Mechanism
    Same Parameters?
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  47. Event Mechanism
    Event Mechanism
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  48. Event Mechanism
    Event Mechanism
    Same Parameters?
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  49. Event Mechanism
    Event Mechanism
    Same Parameters?
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  50. Event Mechanism
    Event Mechanism
    Same Parameters?
    Monday, September 3, 12

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  51. Event Mechanism
    Event Mechanism
    Same Parameters?

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  52. Event Mechanism
    Event Mechanism
    Same Parameters?

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  53. Event Mechanism
    Event Mechanism
    Same Parameters?

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  54. Event Mechanism
    Event Mechanism
    Same Parameters?


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  55. Event Mechanism
    Event Mechanism
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  56. Event Mechanism
    Event Mechanism
    Sequence of Multiple Listeners
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  57. Event Mechanism
    Event Mechanism
    Sequence of Multiple Listeners
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  58. Event Mechanism
    Event Mechanism
    Sequence of Multiple Listeners
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  59. Event Mechanism
    Event Mechanism
    Sequence of Multiple Listeners
    alert(1)
    alert(2)
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  60. Event Mechanism
    Event Mechanism
    Sequence of Multiple Listeners
    alert(1)
    alert(2)
    Queue
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  61. Event Mechanism
    Event Mechanism
    Sequence of Multiple Listeners
    alert(1)
    alert(2)
    Queue
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  62. Event Mechanism
    Event Mechanism
    Sequence of Multiple Listeners
    alert(1)
    alert(2)
    alert(2)
    alert(1)
    Queue
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  63. Event Mechanism
    Event Mechanism
    Sequence of Multiple Listeners
    alert(1)
    alert(2)
    alert(2)
    alert(1)
    Queue Stack
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  64. Event Mechanism
    Event Mechanism
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  65. Event Mechanism
    Event Mechanism
    Event Object
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  66. Event Mechanism
    Event Mechanism
    Event Object
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  67. Event Mechanism
    Event Mechanism
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  68. Event Mechanism
    Event Mechanism
    Turn Bubbling Off
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  69. Event Mechanism
    Event Mechanism
    Turn Bubbling Off
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  70. Event Mechanism
    Event Mechanism
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  71. Event Mechanism
    Event Mechanism
    Event Target
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  72. Event Mechanism
    Event Mechanism
    Event Target
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  73. Event Mechanism
    Event Mechanism
    Event Target
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  74. Event Mechanism
    Event Mechanism
    Event Target
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  75. Event Mechanism
    Event Mechanism
    Event Target
    Target will
    always be
    element2
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  76. Event Mechanism
    Event Mechanism
    Event Target
    Target will
    always be
    element2
    e.currentTarget
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  77. Event Mechanism
    Event Mechanism
    Event Target
    Target will
    always be
    element2
    e.currentTarget
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  78. Event Mechanism
    Event Mechanism
    Event Target
    Target will
    always be
    element2
    e.currentTarget
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  79. Event Mechanism
    Event Mechanism
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  80. Event Mechanism
    Event Mechanism
    “This” in Event
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  81. Event Mechanism
    Event Mechanism
    “This” in Event
    In Javascript this always refers to the “owner” of
    the function we’re executing, or rather, to the
    object that a function is a method of
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  82. Event Mechanism
    Event Mechanism
    “This” in Event
    In Javascript this always refers to the “owner” of
    the function we’re executing, or rather, to the
    object that a function is a method of
    Example: Register click handler on div1
    Monday, September 3, 12

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  83. Event Mechanism
    Event Mechanism
    “This” in Event
    In Javascript this always refers to the “owner” of
    the function we’re executing, or rather, to the
    object that a function is a method of
    Example: Register click handler on div1
    Monday, September 3, 12

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  84. Event Mechanism
    Event Mechanism
    “This” in Event
    In Javascript this always refers to the “owner” of
    the function we’re executing, or rather, to the
    object that a function is a method of
    Example: Register click handler on div1
    Monday, September 3, 12

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  85. Event Mechanism
    Event Mechanism
    “This” in Event
    In Javascript this always refers to the “owner” of
    the function we’re executing, or rather, to the
    object that a function is a method of
    Example: Register click handler on div1
    Monday, September 3, 12

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  86. Event Mechanism
    Event Mechanism
    “This” in Event
    In Javascript this always refers to the “owner” of
    the function we’re executing, or rather, to the
    object that a function is a method of
    Example: Register click handler on div1
    Monday, September 3, 12

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  87. Event Mechanism
    Event Mechanism
    “This” in Event
    In Javascript this always refers to the “owner” of
    the function we’re executing, or rather, to the
    object that a function is a method of
    Example: Register click handler on div1
    Monday, September 3, 12

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  88. Event Mechanism
    Event Mechanism
    “This” in Event
    In Javascript this always refers to the “owner” of
    the function we’re executing, or rather, to the
    object that a function is a method of
    Example: Register click handler on div1
    Monday, September 3, 12

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  89. Event Mechanism
    Event Mechanism
    “This” in Event
    In Javascript this always refers to the “owner” of
    the function we’re executing, or rather, to the
    object that a function is a method of
    Example: Register click handler on div1
    Monday, September 3, 12

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  90. Event Mechanism
    Event Mechanism
    “This” in Event
    In Javascript this always refers to the “owner” of
    the function we’re executing, or rather, to the
    object that a function is a method of
    Example: Register click handler on div1
    Monday, September 3, 12

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  91. Event Mechanism
    Event Mechanism
    “This” in Event
    In Javascript this always refers to the “owner” of
    the function we’re executing, or rather, to the
    object that a function is a method of
    Example: Register click handler on div1
    Monday, September 3, 12

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  92. Event Mechanism
    Event Mechanism
    “This” in Event
    In Javascript this always refers to the “owner” of
    the function we’re executing, or rather, to the
    object that a function is a method of
    Example: Register click handler on div1
    Monday, September 3, 12

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  93. Event Mechanism
    Event Mechanism
    “This” in Event
    In Javascript this always refers to the “owner” of
    the function we’re executing, or rather, to the
    object that a function is a method of
    Example: Register click handler on div1
    Monday, September 3, 12

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  94. Event Mechanism
    Event Mechanism
    “This” in Event
    In Javascript this always refers to the “owner” of
    the function we’re executing, or rather, to the
    object that a function is a method of
    Example: Register click handler on div1
    Monday, September 3, 12

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  95. Event Mechanism
    Event Mechanism
    “This” in Event
    In Javascript this always refers to the “owner” of
    the function we’re executing, or rather, to the
    object that a function is a method of
    Example: Register click handler on div1
    Monday, September 3, 12

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  96. Event Mechanism
    Event Mechanism
    “This” in Event
    In Javascript this always refers to the “owner” of
    the function we’re executing, or rather, to the
    object that a function is a method of
    Example: Register click handler on div1
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  97. Implement an Event Library
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  98. Implement an Event Library
    Version One
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  99. Implement an Event Library
    Version One
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  100. Implement an Event Library
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  101. Implement an Event Library
    Version Two: “this”
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  102. Implement an Event Library
    Version Two: “this”
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  103. Implement an Event Library
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  104. Implement an Event Library
    Version Three: e and data
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  105. Implement an Event Library
    Version Three: e and data
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  106. Implement an Event Library
    Version Three: e and data
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  107. Implement an Event Library
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  108. Implement an Event Library
    Version Three: Combine e and data
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  109. Implement an Event Library
    Version Three: Combine e and data
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  110. Implement an Event Library
    Version Three: Combine e and data
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  111. Implement an Event Library
    Version Three: Combine e and data
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  112. Implement an Event Library
    Version Three: Combine e and data
    TODO:
    Encapsulate the original
    event object
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  113. Implement an Event Library
    Version Three: Combine e and data
    TODO:
    Encapsulate the original
    event object
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  114. Monday, September 3, 12

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  115. Monday, September 3, 12

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  116. Acknowledge
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  117. Acknowledge
    PPK: http://www.quirksmode.org
    W3C: http://www.w3.org/TR/2000/REC-DOM-Level-2-
    Events-20001113/
    YUI Source Code(v2.8.1): http://developer.yahoo.com/yui/2/
    JQuery Source Code(v1.4): http://jquery.com/
    Google Closure Library: http://code.google.com/closure/
    library/
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  118. Thanks!
    Monday, September 3, 12

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