jQuery UI 1.5.1 Changelog

Released on June 26, 2008

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Distance option now defaults to 1 instead of 0, allowing for click events (#3016)
Fixed issue when placeholder didn't exist (#3018)

Disabling droppables does not prevent adding the hoverclass under some circumstances (#3010)

Distance option now defaults to 1 instead of 0, allowing for click events (#3016)
Fixed exception when using containment: document option (#2988)
Renamed autohide option to autoHide (camelCase) for consistency (#2990)
Renamed proxy option to helper for consistency (#2996)
Fixed issues with alsoResize option

Distance option now defaults to 1 instead of 0, allowing for click events (#3016)
Resize callback being called too early (before element resized) (#3026)

Distance option now defaults to 1 instead of 0, allowing for click events (#3016)
Unexpected behavior with sortables, when items contain wrapped lines (#3000)
Corrected items callback to receive standard args: event, ui
Stop being fired too early (#3019)
Placeholder displays above dragged element (#2951)
Placeholder positioning issues; hierarchical sortable issues (#2976)
Connected lists items are not refreshed until you actually move into the connected list - this improves performance for connected lists
Extreme performance increase
Fixed serialize issue when a key was specified as option, but no custom expression
update callback was not called every time (#3028)

Various language file corrections
Allow setting of cell title via beforeShowDay
Fire event on change of month/year (#2876)
onClose bug for ranges in IE; wrapper span bug in IE; remove attribute bug in IE
Allow relative dates with multiple periods
Next link shows > when hideIfNoPrevNext is true (#2658)
Datepicker does not allow manual entry of alphabetic characters (#2700)
Date range + restricting allows invalid range (#2724)
Date formatting characters can be used within the prev/current/next texts. (#2593)
Week row hover styling (#2641)
When showing "off page" behaves strangely (#2371)
Correct datepicker placement when used in static areas; Correct select coverage in IE 6
Split out display date and date value formats (#2038)

The opening and closing of a dialog can now be animated with any jQuery UI effects, using two new options: show, hide. Currently no animation options can be supplied, only a string (the name of the effect). This issue is still in progress. (#2358)
Added resizeHelper
Added dragHelper
Corrected context (thisArg) for callbacks: dragStart, drag, dragStop, resizeStart, resize, resizeStop (#3017)
Added autoResize option; default value: true (#3025)
Fixed buttons so they can be changed after init using .data("buttons.dialog", ... )
Fixed stacking problem with modal dialogs.
Calling open on an already open dialog no longer causes problems (#3032)

Consistent parameters for dispatched events and callbacks. (#2340) Note: This is an API change. The order of parameters for callbacks is different than previous version. Now the first parameter is Event, the second - ui interface object.