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# Change Log ## 4.0.13 ### New features / improvements * Trigger `input` event before `change` events (#4649) * Feed back the keypress code that was responsible for the 'close' event (#5513) * Only trigger `selection:update` once on DOM change events (#5734) ### Bug fixes * Prevent opening of disabled elements (#5751) ### Documentation * Fix "edit this page" links in docs (#5689) ### Miscellaneous * Registered Select2 on Open Collective (#5700, #5721, #5741) ## 4.0.12 ### Bug fixes * Fixes incorrect offset when using the Shadow DOM and styling the `<html>` element (#5682) ### Miscellaneous * Replace cdnjs with jsDelivr in the documentation (#5687) * Fix incorrect provider for the automated NPM deployment (#5686) ## 4.0.11 ### Bug fixes * Fixes jQuery migrate error when getting offset when dropdownParent not in document (#5584) ### Miscellaneous * Enable GitHub actions for CI (#5591) * Documentation has been moved into and is deployed from the code repository (#5638) * Remove Travis CI integration (#5665) ## 4.0.10 ### New features / improvements * Support passing in a selector for `dropdownParent` option (#5622) ### Bug fixes * Fix bug where dropdowns pointing upwards were incorrectly positioned (#5621) ## 4.0.9 ### New features / improvements * Mirror disabled state through aria-disabled on selection (#5579) * Select2 now clears the internal ID when it is destroyed (#5587) * Set the main ARIA 1.1 roles and properties for comboboxes (#5582) * The `language` option now has a clearly defined fallback chain (#5602) ### Bug fixes * Do not propagate click when search box is not empty (#5580) * Fix `maximumSelectionLength` being ignored by `closeOnSelect` (#5581) * Fix generated options not receiving result IDs (#5586) * Remove selection title attribute if text is empty (#5589) * Reposition dropdown whenever items are selected (#5590) * Fix dropdown positioning when displayed above with messages (#5592) * Fix search box expanding width of container (#5595) * `allowClear` no longer shifts selections to a new line (#5603) ### Translations * Fix error in German translations (#5604) ### Miscellaneous * Updated development grunt version so it no longer shows as vulnerable (#5597) * Remove unused variables (#5554) ## 4.0.8 ### New features / improvements * Test against and fix compatibility with jQuery 3.4.1 (#5531) * Results respect disabled state of `<option>` (#5560) * Add `computedstyle` option for calculating the width (#5559) ### Bug fixes * Fix tag creation being broken in 4.0.7 (#5558) * Fix infinite scroll when the scrollbar is not visible (#5575) * Revert change to focusing behaviour in 4.0.6 (#5576) ### Translations * Fix wording in French translations (#5521) ### Miscellaneous * Update grunt-contrib-qunit to latest version (#5530) * Removed unused `.select2-selection__placeholder` CSS definitions for multiple selects (#5508) * Remove deprecated jQuery shorthand (#5564) ## 4.0.7 ### New features/improvements - Do not close on select if Ctrl or Meta (Cmd) keys being held (#5222) ### Bug fixes - Fixed issue where single select boxes would automatically reopen when they were closed (#5490, #5492) ### Miscellaneous - Move almost and jquery-mousewheel to devDependencies (#5489) ## 4.0.6 ### New features/improvements - Add style property to package.json (#5019) - Implement `clear` and `clearing` events (#5058) - Add `scrollAfterSelect` option (#5150) - Add missing diacritics (#4118, #4337, #5464) ### Bug fixes - Fix up arrow error when there are no options in dropdown (#5127) - Add `;` before beginning of factory wrapper (#5089) - Fix IE11 issue with select losing focus after selecting an item (#4860) - Clear tooltip from `select2-selection__rendered` when selection is cleared (#4640, #4746) - Fix keyboard not closing when closing dropdown on iOS 10 (#4680) - User-defined types not normalized properly when passed in as data (#4632) - Perform deep merge for `Defaults.set()` (#4364) - Fix "the results could not be loaded" displaying during AJAX request (#4356) - Cache objects in `Utils.__cache` instead of using `$.data` (#4346, #5486) - Removing the double event binding registration of `selection:update` (#4306) #### Accessibility - Improve `.select2-hidden-accessible` (#4908) - Add role and aria-readonly attributes to single selection dropdown value (#4881) ### Translations - Add Turkmen translations (`tk`) (#5125) - Fix error in French translations (#5122) - Add Albanian translation (`sq`) (#5199) - Add Georgian translation (`ka`) (#5179) - Add Nepali translation (`ne`) (#5295) - Add Bangla translation (`bn`) (#5248) - Add `removeAllItems` translation for clear "x" title (#5291) - Fix wording in Vietnamese translations (#5387) - Fix error in Russian translation (#5401) ### Miscellaneous - Remove duplicate CSS selector in classic theme (#5115) ## 4.0.5 ### Bug fixes - Replace `autocapitalize=off` with `autocapitalize=none` (#4994) ### Translations - Vietnamese: remove an unnecessary quote mark (#5059) - Czech: Add missing commas and periods (#5052) - Spanish: Update the 'errorLoading' message (#5032) - Fix typo in Romanian (#5005) - Improve French translation (#4988) - Add Pashto translation (`ps`) (#4960) - Add translations for lower and upper Sorbian (`dsb` and `hsb`) (#4949) - Updates to Slovak (#4915) - Fixed Norwegian `inputTooShort` message (#4817, 4896) - Add Afrikaans translation (`af`) (#4850) - Add Bosnian translation (`bs`) (#4504) ## 4.0.4 ### New features / Improvements - Make tag matching case insensitive [https://github.com/select2/select2/commit/cb9a90457867ffb14c7b1550bb67e872e0a5c2dd, https://github.com/select2/select2/commit/1167bace78cd3b1a918c1b04f3bac54674eab62b] - Support selecting options with blank or `0` option values [https://github.com/select2/select2/commit/16b4840c0e2df0461998e3b464ee0a546173950d, https://github.com/select2/select2/commit/0358ee528765157234643d289bce6b8ca5889c72] ### Bug fixes - Fix issue with entire form losing focus when tabbing away from a Select2 control (#4419) - Fix UMD support for CommonJS [https://github.com/select2/select2/commit/45a877345482956021161203ac789c25f40a7d5e] ### Documentation - Github Pages documentation has been deprecated, replaced with https://github.com/select2/docs - Add django-autocomplete-light to integrations [https://github.com/select2/select2/pull/4597] - Correct typo in options page [https://github.com/select2/select2/pull/4389] - Correct misspelling in AJAX query parameters example [https://github.com/select2/select2/pull/4435] - "highlight" should be "focus" in focus example [https://github.com/select2/select2/pull/4441] - Correct misspelling in `<select>` serialization example [https://github.com/select2/select2/pull/4538] - Correct typos in documentation [https://github.com/select2/select2/pull/4663] ### Translations - Add `errorLoading` Hungarian translation [https://github.com/select2/select2/commit/7d1d13352321e21670ff1c6cba7413aa264fd57a] - Add `errorLoading` German translation [https://github.com/select2/select2/commit/4df965219ea4c39147fde9335bc260840465933a] - Add Slovene language [https://github.com/select2/select2/commit/8e6422c570a87da8d89c45daf0d253695a943c84] - Add `errorLoading` Galician translation [https://github.com/select2/select2/commit/8fcc6202c37f4e06d951342bf142a3b906b6b8e3] - Add `errorLoading` Thai translation [https://github.com/select2/select2/commit/625fc78ee616baedf64aa37357403b4b72c7363c] - Add `searching` and `errorLoading` Finnish translations [https://github.com/select2/select2/pull/4730] - Add `errorLoading` Turkish translation [https://github.com/select2/select2/commit/fd4a0825315c7055347726d5818c999279f96ff8, https://github.com/select2/select2/commit/751b36767f9f28b9de9428d5e8035c9a404915d9] - Add Armenian language [https://github.com/select2/select2/commit/f6fa52dcc02341df1523f50348f2effc54ee2911] ## 4.0.3 This is the third bugfix release of Select2 4.0.0. It builds upon the [second bugfix release](https://github.com/select2/select2/releases/tag/4.0.2) and fixes many common issues. ### New features / Improvements - The old `dropdownAutoWidth` option now properly works [https://github.com/select2/select2/commit/fe26b083eb830836061de1458e483782cefef424] - A `focus` event on the original `<select>` is now handled [https://github.com/select2/select2/commit/31e7a1d4c52ed7477769fcad5d15166ae3c9b4d0] - Adding and removing options now refreshes the selection automatically [https://github.com/select2/select2/commit/ea79a197e0ffe55aa600eed6d18cbd1c804c3176] ### Bug fixes - `select2('option')` no longer mutate the arguments when working on multiple elements [https://github.com/select2/select2/commit/c2c1aeef31c95c6df5545c900a4e1782d712497c] - Better detect aborted requests [https://github.com/select2/select2/commit/cfb66f5e4f71a56c46a6890c5dde4b7f24f11fa8] - New options are now properly created during tokenization [https://github.com/select2/select2/commit/3b8cd2e36990e695e4cb4b966c8658e7ca1574dc] - Fix positioning bug with non-static parents for the dropdown [https://github.com/select2/select2/pull/4267] - Infinite scrolling no longer resets the keyboard focus [https://github.com/select2/select2/commit/e897d008a672da262ba84cee2a144578696ada29, https://github.com/select2/select2/commit/9f581285d88128b29a01fc1e5fd2d445d610b553] - `selectOnClose` now works properly with `closeOnSelect` [https://github.com/select2/select2/commit/481c43883e23874e9c35879d173eb8cc5b994b12] - Apply `ajax.delay` to empty search terms as well [https://github.com/select2/select2/commit/4b9e02f02211248be25ac4c16d4635cf38237bb9] ### Documentation - Added example for attaching event listeners [https://github.com/select2/select2/commit/84d6b5d840f7f4e6b7a2fb3f08424bf5495c876d] - Correct link to the [Select2 Bootstrap Theme](https://github.com/select2/select2-bootstrap-theme) [https://github.com/select2/select2/pull/4318] - Added example for using a `<label>` [https://github.com/select2/select2/commit/3bc7f4ac78b58eff8cd17b3273596638c3c9c5c1] - Add documentation for `ajax.url` [https://github.com/select2/select2/commit/5a831afb9a7d46e8f20aec21164cfbfd182024de] - Added favicon [https://github.com/select2/select2/pull/4379] ### Translations - Add Khmer translation [https://github.com/select2/select2/pull/4246] - Added Norwegian bokmaal for `errorLoading` [https://github.com/select2/select2/pull/4259] - Fixed pluralization in Lithuanian translation [https://github.com/select2/select2/commit/5b5eddd183c87bf43165b3a98e03eabe10e9fa58] - Add French translation for `errorLoading` [https://github.com/select2/select2/commit/b1ea28bb7d8c02b3b352f558031ccfc8041122eb] - Add Greek translation [https://github.com/select2/select2/pull/4139] ## 4.0.2 This is the second bugfix release of Select2 4.0.0. It builds upon the [first release candidate of Select2 4.0.2](https://github.com/select2/select2/releases/tag/4.0.2-rc.1) with some minor improvements. ### New features / Improvements - Added `insertTag` option to control the placement of the `tags` option [https://github.com/select2/select2/pull/4008] - Added handler for AJAX errors [https://github.com/select2/select2/issues/3501] - Added insertTag to control the tag position [https://github.com/select2/select2/pull/4008] ### Bug fixes - Fixed positioning issues with static dropdown parents [https://github.com/select2/select2/issues/3970] - Fixed existing selections not always being respected with array data [https://github.com/select2/select2/issues/3990] - Sanitize automatically generated ids so CSS identifiers can be used [https://github.com/select2/select2/issues/3618] - Recursively apply defaults so AJAX defaults can be set [https://github.com/select2/select2/commit/983cd8e765c5345bfe7d3bdcc3b0c882a35461ca] - No need to recalculate the top of the dropdown twice [https://github.com/select2/select2/pull/4155] ### Documentation - Updated Bootstrap and Font Awesome dependencies [https://github.com/select2/select2/commit/a5e539b509778eabeb8ce79e191b3ee1e81f6deb, https://github.com/select2/select2/commit/81a4a68b113e0d3e0fb1d0f8b1c33ae1b48ba04f, https://github.com/select2/select2/commit/6369f5f173fb81ec692213782945cc737e248da5] - Use Jekyll's highlighting instead of prettify [https://github.com/select2/select2/commit/54441e6a22be3969dd934ccb769f5d7dde684bfb, https://github.com/select2/select2/commit/74387b98632c75b06d15d83ad5359b9daf0f5dcb, https://github.com/select2/select2/commit/a126b53b4c90fac33b5d855894647cd8bcac3558, https://github.com/select2/select2/commit/75163d67cb80e4279965a97e9eeda5b171806085] - Corrected responsive width example to properly show it working [https://github.com/select2/select2/commit/63d531a9c0ab51f05327492a56f3245777762b45] - Replaced protocol-relative URLs with HTTPS protocol [https://github.com/select2/select2/pull/4127] - Code snippets for mapping `id` and `text` [https://github.com/select2/select2/issues/4086] - Document how to trigger `change` just for Select2 [https://github.com/select2/select2/issues/3620] - Added notes about DOM events [https://github.com/select2/select2/commit/37dbe059fce4578b46b7561e6243b7fdc63ac002] ### Translations - Correct Romanian translation [https://github.com/select2/select2/commit/72d905f9e026d49e7c600f37a1ce742c404654d7] ## 4.0.1 This is the first bugfix release of Select2 4.0.0. It builds upon the [first release candidate of Select2 4.0.1](https://github.com/select2/select2/releases/tag/4.0.1-rc.1) with some minor improvements. ### New features / improvements - The option container is now passed in as the second argument when templating selections using `templateResult` [https://github.com/select2/select2/commit/dc516e7073605723be59bc727b96a3b3dea1ae5a] - The option container is now passed in as the second argument when templating selections using `templateSelection` [https://github.com/select2/select2/pull/3324] - You can immediately start typing to search when tabbing into a multiple select [https://github.com/select2/select2/commit/02cca7baa7b78e73cdcf393172ee3a54be387167, https://github.com/select2/select2/commit/79cdcc0956e242c1ce642bbaa93e538c54f4be0] - All parameters passed in for AJAX requests are now set as query string parameters by default [https://github.com/select2/select2/issues/3548] ### Bug fixes - The search box will now be properly sized after removing a selection [https://github.com/select2/select2/commit/5f80c5d9f81f3c5398c3e6e3e84fd6c67c8873f1] - Dropdown results will now be spoken by screen readers [https://github.com/select2/select2/commit/9fae3d74e373fc646da4e39a0c2ab11efa808c3f] - Options are now properly cloned when initializing multiple instances at once [https://github.com/select2/select2/commit/3c8366e8769233a6b20ade934fe629279e7be6ff] - `selectOnClose` and now be used with `closeOnSelect` without getting a stack overflow [https://github.com/select2/select2/commit/393ca4cf7f7f7097d3a994bda3dbf195e945eba1] - Fixed positioning with non-static parents [https://github.com/select2/select2/commit/c9216b4b966653dd63a67e815b47899ef5325298] - Fixed bug where multiple selects with placeholders were buggy in IE [https://github.com/select2/select2/issues/3300] - Fixed bug where AJAX selects could not be initialized with array data [https://github.com/select2/select2/pull/3375] - `:all:` is now correctly removed when used in `containerCss` and `dropdownCss` options [https://github.com/select2/select2/pull/3464] - Fixed bug where the multiple select search box would appear on the left in RTL mode [https://github.com/select2/select2/pull/3502] - Change ALT + UP to close the dropdown instead of opening it [https://github.com/select2/select2/commit/d2346cc33186c2a00fa2dad29e8e559c42bfea00] - Fix focus issue with the multiple select search box when the `change` event was triggered [https://github.com/select2/select2/commit/698fe7b9e187e182f679aa679eb8b0ecb64a846b, https://github.com/select2/select2/commit/88503d2c67dc7f4fb9395a17f17edfe4948cf738, https://github.com/select2/select2/commit/dd2990adead92593a2dffff6ae004ea8b647d130] - Fix bug in `ArrayAdapter` where the existing `<option>` data would be used instead of the array data [https://github.com/select2/select2/pull/3565] - Remove random call to `$dropdownContainer.width()` in the `AttachBody` decorator [https://github.com/select2/select2/pull/3654] - Fix memory leak in `AttachBody` decorator [https://github.com/select2/select2/commit/671f5a2ce21005090e0b69059799cd3dd1fbbf84] - Selections can no longer be removed when Select2 is in a disabled state [https://github.com/select2/select2/commit/68d068f1d2c7722d011d285a291d1f974bf09772, https://github.com/select2/select2/commit/7d8f86cbf85ebd2179195ff6a2a7a1c5dcb9da58] - Remove redundant `open` event trigger [https://github.com/select2/select2/pull/3507] - Correct references to `this` in `ajax.data` and `ajax.url` callback functions [https://github.com/select2/select2/issues/3361] - Apply select2('option') calls on all elements [https://github.com/select2/select2/pull/3495] ### Design - Fixed original `<select>` not always being hidden correctly in some cases [https://github.com/select2/select2/pull/3301] - Fix potential issue with Bootstrap's gradients in Internet Explorer [https://github.com/select2/select2/pull/3307] - Improve compatibility with Zurb Foundation [https://github.com/select2/select2/pull/3290] - Remove padding on mobile safari search field in multiple selects [https://github.com/select2/select2/pull/3605] - Fix the clear button appearing beneath long text [https://github.com/select2/select2/issues/3306] - Migrate the CSS classes for the "Loading more results" message to BEM [https://github.com/select2/select2/issues/3889] - Fix inline search not displaying properly in Safari [https://github.com/select2/select2/issues/3459] ### Documentation - New documentation theme designed by @fk [https://github.com/select2/select2/pull/3376, https://github.com/select2/select2/pull/3467, https://github.com/select2/select2/pull/3488] - Update ajax example to reflect pagination [https://github.com/select2/select2/pull/3357] - Fix incorrect option name in `maxiumSelectionLength` example [https://github.com/select2/select2/pull/3454] - Fix typos in the disabled mode/results examples [https://github.com/select2/select2/pull/3665] - Fix `Option` parameters in the 4.0 announcement [https://github.com/select2/select2/pull/3547] - Fix invalid JSON in the tags example within the 4.0 announcement [https://github.com/select2/select2/pull/3637] ### Translations - Added Cyrillic variant of the Serbian language [https://github.com/select2/select2/pull/3943] - Corrected Thai "no results found" translation [https://github.com/select2/select2/pull/3782] - Swapped the `inputTooLong` and `inputTooShort` messages in the Galician translation [https://github.com/select2/select2/pull/3291] - Fix improper grammar in Dutch translation [https://github.com/select2/select2/pull/3692] - Add Japanese translation [https://github.com/select2/select2/pull/3477] - Polish translation: Fixed typo in maximum selected message [https://github.com/select2/select2/pull/3587] - Add Malay translation [https://github.com/select2/select2/pull/3635] - Add `errorLoading` for Indonesian translation [https://github.com/select2/select2/pull/3635] - Correct grammar issues in Hebrew translation [https://github.com/select2/select2/pull/3911] - Add `errorLoading` for Danish translation [https://github.com/select2/select2/pull/3870] - Add Arabic translation [https://github.com/select2/select2/pull/3859] ## 4.0.0 This builds upon [the second release candidate](https://github.com/select2/select2/tree/4.0.0-rc.2), **so review all previous release notes** before upgrading from previous versions of Select2. ### Supported environments - jQuery 1.7.2+ - Modern browsers (Chrome, Firefox, Safari) - Internet Explorer 8+ ### New features - Fully compatible with AMD and UMD based loaders. - Advanced plugin system that [uses custom adapters](https://select2.org/advanced/adapters-and-decorators). - Full support for `jQuery.noConflict`. - A `<select>` is the recommended element and [can be used for all options](https://select2.org/upgrading/migrating-from-35#no-more-hidden-input-tags). There is limited backwards-compatible support for the `<input>` element in [full builds](https://select2.org/getting-started/builds-and-modules). - [Declarative configuration through `data-*` attributes](https://select2.org/configuration/data-attributes) - Easy to configure theme system and new default theme - You can use more specific locales (like `en-US`) and Select2 will be able to determine what translation files to load. ### Breaking changes - Select2 now uses the MIT license - [The full build](https://select2.org/getting-started/builds-and-modules) of Select2 no longer includes jQuery - You must include jQuery separately on your page. - Select2 will prevent the inner scrolling of modals (and other scrollable containers) when it is open to prevent the UI from breaking. [Read more at the commit.](https://github.com/select2/select2/commit/003d6053a9fff587c688008397e7d5824463fe99) - jQuery is no longer listed as a dependency in the `bower.json`/`component.json` files. - [`<select>` has replaced `<input type="hidden" />`](https://select2.org/upgrading/migrating-from-35#no-more-hidden-input-tags) for **all options** (_including remote data_) - The [`matcher` has been revamped](https://select2.org/upgrading/migrating-from-35#advanced-matching-of-searches) to include full context, a compatibility module (`select2/compat/matcher`) has been created - The [display always reflects the order](https://select2.org/upgrading/migrating-from-35#display-reflects-the-actual-order-of-the-values) data is sent to the server - The click mask is no longer the default (again). You can get back the old functionality by wrapping your `selectionAdapter` with the `ClickMask` (`select2/selection/clickMask`) decorator. - Select2 no longer stops the propagation of events happening within the dropdown and selection. You can use the `StopPropagation` modules available in the [full builds](https://select2.org/getting-started/builds-and-modules) to prevent this. [https://github.com/select2/select2/commit/8f8140e3b00c5d5bb232455137c4c633d7da4275] - The enter key no longer toggles the state of multiple select items in the results, but instead will only select them. Use CTRL + Space instead to toggle the state. [https://github.com/select2/select2/commit/017c20109471fa5b835603faf5dc37f7c2c2ea45] - Warnings will now be triggered in the developer console if Select2 detects an unsupported configuration. #### Options - The default value of the `width` option has been changed from `style` to `resolve`. - The `copy` value for the `width` option has been renamed to `style`. ##### Renamed - `formatSelection` -> `templateSelection` - `formatResult` -> `templateResult` - `sortResults` -> `sorter` - `createSearchChoice` -> `createTag` - `selectOnBlur` -> `selectOnClose` - `ajax.jsonpCallback` -> `ajax.jsonp` - `ajax.results` -> `ajax.processResults` - `tags: [array,of,data]` -> `data: [array,of,data], tags: true` - `placeholderOption` has been replaced by `placeholder.id` (`placeholder` -> `placeholder.text`) ##### [Internationalization](https://select2.org/i18n) - `formatNoMatches` -> `language.noMatches` - `formatSearching` -> `language.searching` - `formatInputTooShort` -> `language.inputTooShort` - `formatInputTooLong` -> `language.inputTooLong` - `formatAjaxError` -> `language.errorLoading` - `formatLoading` -> `language.loadingMore` - `formatSelectionTooBig` -> `language.maximumSelected` ##### Deprecated/Removed - `initSelection` - This is [no longer needed](https://select2.org/upgrading/migrating-from-35#removed-the-requirement-of-initselection) with `<select>` tags. Limited backwards compatibility in the [full build](https://select2.org/getting-started/builds-and-modules). - `id` - Data objects should now always have `id` and `text` attributes that are strings, use [`$.map`](https://api.jquery.com/jquery.map/) when migrating - `query` - Use a [custom data adapter](https://select2.org/upgrading/migrating-from-35#custom-data-adapters-instead-of-query) instead. Limited backwards compatibility in the [full build](https://select2.org/getting-started/builds-and-modules). - `ajax.params` - All parameters passed to `ajax` will be passed to the AJAX data transport function #### Methods ##### Renamed - `.select2("val", [value])` -> `.val([value])` - `.select2("enable", !disabled)` -> `.prop("disabled", disabled)` ##### Removed - `.select2("onSortStart")` and `.select2("onSortEnd")` - A custom [selection adapter](https://select2.org/advanced/default-adapters/selection) should be created instead - `.select2("data", data)` - Create the `<option>` tags for the objects that you would like to set, and set the `.val` to select them - `.select2("readonly")` - There is [no way to make a `<select>` element read-only](http://stackoverflow.com/q/368813/359284), disable it instead #### Events ##### New - `select2:closing` is triggered before the dropdown is closed - `select2:select` is triggered when an option is selected ##### Renamed - `select2-close` is now `select2:close` - `select2-open` is now `select2:open` - `select2-opening` is now `select2:opening` - `select2-selecting` is now `select2:selecting` - `select2-removed` is now `select2:unselect` - `select2-removing` is now `select2:unselecting` ##### Removed - `select2-clearing` has been removed in favor of `select2:unselecting` - `select2-highlight` - `select2-loaded` - `select2-focus` - Use the native `focus` event instead - `select2-blur` - Use the native `blur` event instead - All extra properties from the `change` event were removed - `val` can be retrieved with `$element.val()` instead - `added` can be retrieved by listening to `select2:select` - `removed` can be retrieved by listening to `select2:unselect`