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很棒的在线教学系统

Container Release Notes

*** version 2.6.0 ***

Changes:
--------

+ 1px rounded corners in Sam-Skin, added in 2.3.0, are no longer
  rendered in IE6 or IE7.
  
  hasLayout and relative positioning applied 
  to the header, body and footer elements to achieve the 1px 
  rounded corners had functional side effects (such as the inability
  to shrink-wrap auto width containers, and the creation of invalid
  stacking contexts)
  
  1px rounded corners can be re-applied with a CSS patch if required,
  as discussed on the container documentation web page.
  
+ We now attempt to focus the first focusable element inside a Panel,
  when it is shown (as is done with Dialog).
  
+ Setting the "height" configuration property will now result in the 
  container's body element being resized to fill out any empty 
  vertical space. This behavior can be configured using the 
  "autofillheight" configuration property discussed below.

Added the following features:
-----------------------------

+ Added a new "preventcontextoverlap" configuration property used 
  to manage whether or not an Overlay instance should overlap its 
  context element (defined using the "context" configuration property)
  when the "constraintoviewport" configuration property is set 
  to "true".

+ Added ability to specify event triggers when using the "context"
  configuration property. The container wil re-align itself with 
  the context element in response to these trigger events.

  See context configuration property documentation for usage details.
  
+ Added "autofillheight" configuration property, which is set to "body"
  by default. This configuration property can be used to specify which
  of the 3 container element - "header", "body", "footer" should be
  resized to fill out any remaining vertical space when the container's
  "height" configuration property is set.

  The property can be set to false/null to disable the feature if 
  desired.
  
+ Panel now supports focusFirst and focusLast methods, as 
  well as tab, shift-tab looping when modal (similar to Dialog).

Fixed the following bugs:
-------------------------

+ Fixed issue with tooltip iframe remaining visible in situations
  where the page was scrolled down.
  
+ Fixed OverlayManager.find to return null, if the Overlay cannot
  be found.

+ OverlayManager no longer overwrites focus or blur methods on the 
  registered container, if they already exist (e.g. for Menu). Instead
  it registers focus/blur event listeners to maintain OverlayManager
  state in such situations.
  
+ Panels/Dialogs without a fixed width specified (auto width containers) 
  now shrink-wrap correctly in IE6, IE7 (see 1px rounded corner discussion 
  above)

+ Added text to the close icon, to enhance accessibility for screen 
  readers. Also changed the close icon element from a span, to an anchor
  to facilate keyboard tab access.
  
+ Added title to text resize monitor iframe, to assist screen readers.

+ Fixed modal mask resizing when going from a larger to a smaller window
  size.
  
+ hideMaskEvent is now fired after all modal mask relatd state changes 
  (including changes to the document.body) have taken place. 
  
  Originally it was fired before removing the "masked" class from 
  document.body.
  
+ Fixed Sam Skin look/feel for default Dialog buttons. Originally 
  disabled default buttons looked the same as enabled default buttons.
  
+ Fixed asynchronous Dialog submission failure for cases where the form
  contained elements named "action" or "method".
  
+ Fixed Dialog button focus methods when using YUI Buttons.

+ Modal Dialogs buttons are now included in the tab, shift-tab flow. 
  Originally buttons in Modal dialogs were unreachable when tabbing.
  
+ Individual focus handlers attached to all non-container focusable
  elements (used to enforce modality), resulted in poor performance 
  when showing/hiding modal Panels, especially in IE, on pages with
  a large number of focusable elements.
  
  Instead of individual listeners, Panel now registers a single 
  focus listener on the document to enforce modality, improving
  performance and scalability for modal solutions.
  
+ Files for optional component dependencies (e.g. animation, dragdrop,
  connection) can now be included after container's js files, without
  breaking related functionality.
  
+ Fixed Config to remove (null out) current entry from the 
  config queue, before invoking fireEvent for the entry, to 
  keep it from being re-added to the end of the queue if 
  listeners were to set a property which superceded the entry.

*** version 2.5.2 ***

+ No change.

*** version 2.5.1 ***

Fixed the following bugs:
-------------------------

+ Module.setBody, setHeader and setFooter methods now accept
  DocumentFragments. This feature was implicitly available
  in versions prior to 2.5.0 and is now officially supported.

Changes:
--------

+ Optimized addition of Modality focus handlers on masked
  elements (which are used to enforce modality) and added 
  ability to disable feature, to avoid timeout script errors 
  in IE if your page contains a very large number of focusable 
  elements.

  Additionally changes to Event in 2.5.1 should allow
  for increased scalability, when using Modal panels containing
  large numbers of focusable elements on the page.

  Added a YAHOO.widget.Panel.FOCUSABLE property, defining 
  the set of elements which should have focus handlers applied 
  when covered by the Modal mask.

  If you wish to disable the addition of focus handlers to all
  focusable elements on the page when a Modal Panel is displayed,
  the property can be set to an empty array:

        YAHOO.widget.Panel.FOCUSABLE = [];

  NOTE: This will mean that elements under mask may still be
  accessible using the keyboard, however the mask will still 
  prevent mouse access to elements.

*** version 2.5.0 ***

Fixed the following bugs:
-------------------------

+ We now add the text resize monitor iframe to the DOM in a timeout,
  to help alleviate the perpetual loading indicator seen in 
  Firefox 2.0.0.8 (Gecko 1.8.1.8) and above on Windows.

+ Changed the closing script tag string used in the resize monitor, to 
  allow container-min.js, container_core-min.js content to be used inline.

+ Fixed problem with underlay size being too short in IE6 when setting up
  an initially visible Dialog with buttons.
  
+ Removed overflow:auto applied to the modal mask for all browsers other 
  than gecko/MacOS to help avoid the "missing text cursor" Gecko bug. 
  Overflow:auto is still applied to for Gecko/MacOS to help avoid 
  scrollbar bleedthrough, another Gecko bug (discussed in Container's 
  known issues section).
  
Added the following features:
-----------------------------

+ Added a "hideaftersubmit" config property to Dialog, to allow the end
  user to configure whether or not the Dialog should be hidden after
  it has been submitted. By default it is set to false, to provide 
  backwards compatibility.
  
+ Added contextMouseOverEvent, contextMouseOutEvent and 
  contextTriggerEvent events to Tooltip, which provide access to the 
  context element when the user mouses over a context element, mouses 
  out of a context element, and before a tooltip is about to be 
  triggered (displayed) for a context element. See the API docs for
  these events for futher details.
  
+ Added a "disabled" config property to Tooltip, to allow the user
  to dynamically disable a tooltip.
  
Changes:
--------

+ Optimized constraintoviewport handling for Overlays which haven't
  been specifically positioned, so that the constraint checks aren't
  made before every show.

*** version 2.4.0 ***

Fixed the following bugs:
-------------------------

+ constraintoviewport and fixedcenter now handle Overlays which are 
  larger than the viewport. The Overlay will be positioned such that
  it's top, left corner is in the viewport. Panel's draggable 
  behavior now also honors constraintoviewport, if the panel is 
  larger than the viewport.

+ constrainToViewport will now correctly constrain Overlays which 
  haven't been specifically positioned (don't have an XY value set).

+ Overlay/OverlayManager bringToTop methods will bring Overlays to 
  the top of the stack, even if their current zindex is the same as 
  other Overlays on the page.

+ Fixed double textResizeEvents fired on gecko based browsers (e.g
  Firefox 2.x).

+ Panel underlay now resizes correctly in Safari 2.x, when the 
  content of the Panel is modified (e.g. when setBody() is called).
  
+ Tooltip "text" configuration property is no longer overridden by
  the "title" attribute value on the context element if both are
  set. The "text" configuration property takes precedence 
  (as indicated in the Tooltip documentation).

+ Transparent shadows no longer become opaque (black) in IE6/IE7 
  when a Panel with ContainerEffect.FADE is hidden and then 
  shown again. Also on IE6/IE7 transparent shadows no longer 
  appear opaque while animation is in progress.

+ An empty header is no longer created for non-draggable 
  Dialogs/SimpleDialogs which don't provide their own headers.
  By design, an empty header is still created for draggable 
  Dialogs/SimpleDialogs which don't provide a header, in order 
  to provide a drag handle.
  
+ Select boxes inside Modal Panels on IE6 are no longer hidden.

+ In Sam Skin, Dialog/SimpleDialog default and non-default HTML 
  buttons (used when YUI Button is not included on the page) now 
  have a consistent look. Previously style properties intended 
  for default YUI Buttons, were being incorrectly applied to 
  default HTML buttons, giving them a look inconsistent with 
  non-default buttons.

Added the following features:
-----------------------------

+ Added "dragOnly" configuration property to Panel, to leverage
  the "dragOnly" configuration property added to the DragDrop 
  utility for 2.4.0.

  When the "dragOnly" configuration property is set to true,
  the DD instance created for the Panel will not check for drop 
  targets on the page, improving performance during drag operations 
  which don't require drop target interaction.

  The property is set to "false" by default to maintain backwards
  compatibility with older 2.x releases, but should be set to "true"
  if no drop targets for the Panel exist on the page.

  See the DragDrop utilities 2.4.0 README for additional information.

*** version 2.3.1 ***

Fixed the following bugs:
-------------------------

+ To help reduce the occurrence of "Operation Aborted" errors in IE, 
  containers which are rendered to the document's BODY element (e.g. 
  myOverlay.render(document.body)) are now inserted before the first
  child of the BODY element. This applies to both the container 
  element as well as the iframe shim if enabled.

  Prior to 2.3.1, these two elements were appended as the last 
  children of the BODY element.