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    CompositionEvent

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    The DOM CompositionEvent represents events that occur due to the user indirectly entering text.

    Method overview

    void initCompositionEvent(in DOMString typeArg,in boolean canBubbleArg, in boolean cancelableArg, in views::AbstractView viewArg, in DOMString dataArg, in DOMString localeArg);

    Attributes

    Attribute Type Description
    data DOMString

    For compositionstart events, this is the currently selected text that will be replaced by the string being composed. This value doesn't change even if content changes the selection range; rather, it indicates the string that was selected when composition started.

    For compositionupdate, this is the string as it stands currently as editing is ongoing.

    For compositionend events, this is the string as committed to the editor.

    Read only.
    locale DOMString

    The locale of current input method (for example, the keyboard layout locale if the composition is associated with IME). Read only.

    Methods

    initCompositionEvent

    Initializes the attributes of a composition event.

    void initCompositionEvent(
  in DOMString typeArg,
  in boolean canBubbleArg,
  in boolean cancelableArg,
  in views::AbstractView viewArg,
  in DOMString dataArg,
  in DOMString localeArg
);
    Parameters
    typeArg
    The type of composition event; this will be one of compositionstart, compositionupdate, or compositionend.
    canBubbleArg
    Whether or not the event can bubble.
    cancelableArg
    Whether or not the event can be canceled.
    viewArg
    The window object from which the event was generated.
    dataArg
    The value of the data attribute.
    localeArg
    The value of the locale attribute.

    Specifications

    Specification Status Comment
    Document Object Model (DOM) Level 3 Events Specification
    The definition of 'CompositionEvent' in that specification.    		 Working Draft  

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
    Basic support (Yes) 9.0 (9.0) (Yes) No support ?
    Feature Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
    Basic support ? 9.0 (9.0) ? ? ?

    Gecko notes

    The compositionstart and compositionend events were fired in versions of Gecko before 9.0, but didn't have the DOM Level 3 attributes and methods. In addition, support for the compositionupdate event was added in Gecko 9.0 (Firefox 9.0 / Thunderbird 9.0 / SeaMonkey 2.6).

    Note: Gecko doesn't support the locale attribute for trusted events yet.  However, web developers can set this value via initCompositionEvent() when creating untrusted events.

    Gecko's editors (for example, <input type="text">, <div contenteditable/>, and designMode) start composition after the bubble phase of compositionstart. So, by the time your compositionstart handler is called, no contents have not been modified.

    Gecko's editors don't handle the compositionupdate event yet. By the time your compositionupdate handler is called, no contents have been modified.

    By the time your compositionend event handler is called, composition is complete, and no further changes will occur. For that reason, if you call event.stopPropagation() on the compositionstart or compositionend event, you can break composition behavior and cause editors to fail to manage editing properly. See bug 697842 for progress on this problem getting fixed.

    See also

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