Add chosen support to HTMLForm's multiselect field

For very large multiselects, the list of checkboxes is overwhelming. This change adds support for using jquery.chosen conditionally on multiselect fields, if 'chosen' is used for the cssclass parameter. Change-Id: If1eba7fb705089deb4cff7a326db0ac803a522ec
2013-04-09 00:48:21 -07:00 · 2013-04-09 00:48:21 -07:00 · 8a9341b186
commit 8a9341b186
parent 22f2a62077
11 changed files with 1603 additions and 2 deletions
--- a/.jshintignore
+++ b/.jshintignore
@ -23,6 +23,7 @@ resources/jquery.effects/
 resources/jquery.tipsy/
 resources/jquery.ui/
 resources/mediawiki.libs/
+resources/jquery.chosen/chosen.jquery.js

 # legacy scripts
 skins/common/
--- a/RELEASE-NOTES-1.22
+++ b/RELEASE-NOTES-1.22
@ -54,6 +54,8 @@ production.
  well.
 * (bug 45535) introduced the new 'LanguageLinks' hook for manipulating the
  language links associated with a page before display.
+* Chosen (http://harvesthq.github.io/chosen/) was added as module 'jquery.chosen'
+* HTMLForm will turn multiselect checkboxes into a Chosen interface when setting cssclass 'mw-chosen'

 === Bug fixes in 1.22 ===
 * Disable Special:PasswordReset when $wgEnableEmail. Previously one could still
--- a/languages/messages/MessagesEn.php
+++ b/languages/messages/MessagesEn.php
@ -4888,6 +4888,7 @@ This site is experiencing technical difficulties.',
 'htmlform-selectorother-other' => 'Other',
 'htmlform-no'                  => 'No',
 'htmlform-yes'                 => 'Yes',
+'htmlform-chosen-placeholder'  => 'Select an option',

 # SQLite database support
 'sqlite-has-fts' => '$1 with full-text search support',
--- a/languages/messages/MessagesQqq.php
+++ b/languages/messages/MessagesQqq.php
@ -8747,6 +8747,7 @@ See also:
 {{Identical|No}}',
 'htmlform-yes' => 'Used in form, such as with radio buttons, for generic yes / no questions.
 {{Identical|Yes}}',
+'htmlform-chosen-placeholder' => 'Used as initial placeholder text in select multiple "chosen" input boxes',

 # SQLite database support
 'sqlite-has-fts' => 'Shown on [[Special:Version]].
--- a/resources/Resources.php
+++ b/resources/Resources.php
@ -141,6 +141,10 @@ return array(
 		'scripts' => 'resources/jquery/jquery.checkboxShiftClick.js',
 		'targets' => array( 'desktop', 'mobile' ),
 	),
+	'jquery.chosen' => array(
+		'scripts' => 'resources/jquery.chosen/chosen.jquery.js',
+		'styles' => 'resources/jquery.chosen/chosen.css',
+	),
 	'jquery.client' => array(
 		'scripts' => 'resources/jquery/jquery.client.js',
 		'targets' => array( 'desktop', 'mobile' ),
@ -636,6 +640,7 @@ return array(
 	),
 	'mediawiki.htmlform' => array(
 		'scripts' => 'resources/mediawiki/mediawiki.htmlform.js',
+		'messages' => array( 'htmlform-chosen-placeholder' ),
 	),
 	'mediawiki.notification' => array(
 		'styles' => 'resources/mediawiki/mediawiki.notification.css',
--- a/resources/jquery.chosen/LICENSE
+++ b/resources/jquery.chosen/LICENSE
@ -0,0 +1,24 @@
+# Chosen, a Select Box Enhancer for jQuery and Protoype
+## by Patrick Filler for [Harvest](http://getharvest.com)
+
+Available for use under the [MIT License](http://en.wikipedia.org/wiki/MIT_License)
+
+Copyright (c) 2011-2013 by Harvest
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
--- a/resources/jquery.chosen/chosen-sprite.png
+++ b/resources/jquery.chosen/chosen-sprite.png
--- a/resources/jquery.chosen/chosen-sprite@2x.png
+++ b/resources/jquery.chosen/chosen-sprite@2x.png
--- a/resources/jquery.chosen/chosen.css
+++ b/resources/jquery.chosen/chosen.css
@ -0,0 +1,413 @@
+/* @group Base */
+.chzn-container {
+  font-size: 13px;
+  position: relative;
+  display: inline-block;
+  zoom: 1;
+  *display: inline;
+}
+.chzn-container .chzn-drop {
+  background: #fff;
+  border: 1px solid #aaa;
+  border-top: 0;
+  position: absolute;
+  top: 29px;
+  left: 0;
+  -webkit-box-shadow: 0 4px 5px rgba(0,0,0,.15);
+  -moz-box-shadow   : 0 4px 5px rgba(0,0,0,.15);
+  box-shadow        : 0 4px 5px rgba(0,0,0,.15);
+  z-index: 1010;
+}
+/* @end */
+
+/* @group Single Chosen */
+.chzn-container-single .chzn-single {
+  background-color: #ffffff;
+  filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#ffffff', endColorstr='#eeeeee', GradientType=0 );   
+  background-image: -webkit-gradient(linear, 0 0, 0 100%, color-stop(20%, #ffffff), color-stop(50%, #f6f6f6), color-stop(52%, #eeeeee), color-stop(100%, #f4f4f4));
+  background-image: -webkit-linear-gradient(top, #ffffff 20%, #f6f6f6 50%, #eeeeee 52%, #f4f4f4 100%);
+  background-image: -moz-linear-gradient(top, #ffffff 20%, #f6f6f6 50%, #eeeeee 52%, #f4f4f4 100%);
+  background-image: -o-linear-gradient(top, #ffffff 20%, #f6f6f6 50%, #eeeeee 52%, #f4f4f4 100%);
+  background-image: linear-gradient(#ffffff 20%, #f6f6f6 50%, #eeeeee 52%, #f4f4f4 100%); 
+  -webkit-border-radius: 5px;
+  -moz-border-radius   : 5px;
+  border-radius        : 5px;
+  -moz-background-clip   : padding;
+  -webkit-background-clip: padding-box;
+  background-clip        : padding-box;
+  border: 1px solid #aaaaaa;
+  -webkit-box-shadow: 0 0 3px #ffffff inset, 0 1px 1px rgba(0,0,0,0.1);
+  -moz-box-shadow   : 0 0 3px #ffffff inset, 0 1px 1px rgba(0,0,0,0.1);
+  box-shadow        : 0 0 3px #ffffff inset, 0 1px 1px rgba(0,0,0,0.1);
+  display: block;
+  overflow: hidden;
+  white-space: nowrap;
+  position: relative;
+  height: 23px;
+  line-height: 24px;
+  padding: 0 0 0 8px;
+  color: #444444;
+  text-decoration: none;
+}
+.chzn-container-single .chzn-default {
+  color: #999;
+}
+.chzn-container-single .chzn-single span {
+  margin-right: 26px;
+  display: block;
+  overflow: hidden;
+  white-space: nowrap;
+  -o-text-overflow: ellipsis;
+  -ms-text-overflow: ellipsis;
+  text-overflow: ellipsis;
+}
+.chzn-container-single .chzn-single abbr {
+  display: block;
+  position: absolute;
+  right: 26px;
+  top: 6px;
+  width: 12px;
+  height: 12px;
+  font-size: 1px;
+  background: url('chosen-sprite.png') -42px 1px no-repeat;
+}
+.chzn-container-single .chzn-single abbr:hover {
+  background-position: -42px -10px;
+}
+.chzn-container-single.chzn-disabled .chzn-single abbr:hover {
+  background-position: -42px -10px;
+}
+.chzn-container-single .chzn-single div {
+  position: absolute;
+  right: 0;
+  top: 0;
+  display: block;
+  height: 100%;
+  width: 18px;
+}
+.chzn-container-single .chzn-single div b {
+  background: url('chosen-sprite.png') no-repeat 0px 2px;
+  display: block;
+  width: 100%;
+  height: 100%;
+}
+.chzn-container-single .chzn-search {
+  padding: 3px 4px;
+  position: relative;
+  margin: 0;
+  white-space: nowrap;
+  z-index: 1010;
+}
+.chzn-container-single .chzn-search input {
+  background: #fff url('chosen-sprite.png') no-repeat 100% -20px;
+  background: url('chosen-sprite.png') no-repeat 100% -20px, -webkit-gradient(linear, 0 0, 0 100%, color-stop(1%, #eeeeee), color-stop(15%, #ffffff));
+  background: url('chosen-sprite.png') no-repeat 100% -20px, -webkit-linear-gradient(top, #eeeeee 1%, #ffffff 15%);
+  background: url('chosen-sprite.png') no-repeat 100% -20px, -moz-linear-gradient(top, #eeeeee 1%, #ffffff 15%);
+  background: url('chosen-sprite.png') no-repeat 100% -20px, -o-linear-gradient(top, #eeeeee 1%, #ffffff 15%);
+  background: url('chosen-sprite.png') no-repeat 100% -20px, linear-gradient(#eeeeee 1%, #ffffff 15%);
+  margin: 1px 0;
+  padding: 4px 20px 4px 5px;
+  outline: 0;
+  border: 1px solid #aaa;
+  font-family: sans-serif;
+  font-size: 1em;
+}
+.chzn-container-single .chzn-drop {
+  -webkit-border-radius: 0 0 4px 4px;
+  -moz-border-radius   : 0 0 4px 4px;
+  border-radius        : 0 0 4px 4px;
+  -moz-background-clip   : padding;
+  -webkit-background-clip: padding-box;
+  background-clip        : padding-box;
+}
+/* @end */
+
+.chzn-container-single-nosearch .chzn-search input {
+  position: absolute;
+  left: -9000px;
+}
+
+/* @group Multi Chosen */
+.chzn-container-multi .chzn-choices {
+  background-color: #fff;
+  background-image: -webkit-gradient(linear, 0 0, 0 100%, color-stop(1%, #eeeeee), color-stop(15%, #ffffff));
+  background-image: -webkit-linear-gradient(top, #eeeeee 1%, #ffffff 15%);
+  background-image: -moz-linear-gradient(top, #eeeeee 1%, #ffffff 15%);
+  background-image: -o-linear-gradient(top, #eeeeee 1%, #ffffff 15%);
+  background-image: linear-gradient(#eeeeee 1%, #ffffff 15%);
+  border: 1px solid #aaa;
+  margin: 0;
+  padding: 0;
+  cursor: text;
+  overflow: hidden;
+  height: auto !important;
+  height: 1%;
+  position: relative;
+}
+.chzn-container-multi .chzn-choices li {
+  float: left;
+  list-style: none;
+}
+.chzn-container-multi .chzn-choices .search-field {
+  white-space: nowrap;
+  margin: 0;
+  padding: 0;
+}
+.chzn-container-multi .chzn-choices .search-field input {
+  color: #666;
+  background: transparent !important;
+  border: 0 !important;
+  font-family: sans-serif;
+  font-size: 100%;
+  height: 15px;
+  padding: 5px;
+  margin: 1px 0;
+  outline: 0;
+  -webkit-box-shadow: none;
+  -moz-box-shadow   : none;
+  box-shadow        : none;
+}
+.chzn-container-multi .chzn-choices .search-field .default {
+  color: #999;
+}
+.chzn-container-multi .chzn-choices .search-choice {
+  -webkit-border-radius: 3px;
+  -moz-border-radius   : 3px;
+  border-radius        : 3px;
+  -moz-background-clip   : padding;
+  -webkit-background-clip: padding-box;
+  background-clip        : padding-box;
+  background-color: #e4e4e4;
+  filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#f4f4f4', endColorstr='#eeeeee', GradientType=0 ); 
+  background-image: -webkit-gradient(linear, 0 0, 0 100%, color-stop(20%, #f4f4f4), color-stop(50%, #f0f0f0), color-stop(52%, #e8e8e8), color-stop(100%, #eeeeee));
+  background-image: -webkit-linear-gradient(top, #f4f4f4 20%, #f0f0f0 50%, #e8e8e8 52%, #eeeeee 100%);
+  background-image: -moz-linear-gradient(top, #f4f4f4 20%, #f0f0f0 50%, #e8e8e8 52%, #eeeeee 100%);
+  background-image: -o-linear-gradient(top, #f4f4f4 20%, #f0f0f0 50%, #e8e8e8 52%, #eeeeee 100%);
+  background-image: linear-gradient(#f4f4f4 20%, #f0f0f0 50%, #e8e8e8 52%, #eeeeee 100%); 
+  -webkit-box-shadow: 0 0 2px #ffffff inset, 0 1px 0 rgba(0,0,0,0.05);
+  -moz-box-shadow   : 0 0 2px #ffffff inset, 0 1px 0 rgba(0,0,0,0.05);
+  box-shadow        : 0 0 2px #ffffff inset, 0 1px 0 rgba(0,0,0,0.05);
+  color: #333;
+  border: 1px solid #aaaaaa;
+  line-height: 13px;
+  padding: 3px 20px 3px 5px;
+  margin: 3px 0 3px 5px;
+  position: relative;
+  cursor: default;
+}
+.chzn-container-multi .chzn-choices .search-choice.search-choice-disabled {
+  background-color: #e4e4e4;
+  filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#f4f4f4', endColorstr='#eeeeee', GradientType=0 );
+  background-image: -webkit-gradient(linear, 0% 0%, 0% 100%, color-stop(20%, #f4f4f4), color-stop(50%, #f0f0f0), color-stop(52%, #e8e8e8), color-stop(100%, #eeeeee));
+  background-image: -webkit-linear-gradient(top, #f4f4f4 20%, #f0f0f0 50%, #e8e8e8 52%, #eeeeee 100%);
+  background-image: -moz-linear-gradient(top, #f4f4f4 20%, #f0f0f0 50%, #e8e8e8 52%, #eeeeee 100%);
+  background-image: -o-linear-gradient(top, #f4f4f4 20%, #f0f0f0 50%, #e8e8e8 52%, #eeeeee 100%);
+  background-image: -ms-linear-gradient(top, #f4f4f4 20%, #f0f0f0 50%, #e8e8e8 52%, #eeeeee 100%);
+  background-image: linear-gradient(top, #f4f4f4 20%, #f0f0f0 50%, #e8e8e8 52%, #eeeeee 100%);
+  color: #666;
+  border: 1px solid #cccccc;
+  padding-right: 5px;
+}
+.chzn-container-multi .chzn-choices .search-choice-focus {
+  background: #d4d4d4;
+}
+.chzn-container-multi .chzn-choices .search-choice .search-choice-close {
+  display: block;
+  position: absolute;
+  right: 3px;
+  top: 4px;
+  width: 12px;
+  height: 12px;
+  font-size: 1px;
+  background: url('chosen-sprite.png') -42px 1px no-repeat;
+}
+.chzn-container-multi .chzn-choices .search-choice .search-choice-close:hover {
+  background-position: -42px -10px;
+}
+.chzn-container-multi .chzn-choices .search-choice-focus .search-choice-close {
+  background-position: -42px -10px;
+}
+/* @end */
+
+/* @group Results */
+.chzn-container .chzn-results {
+  margin: 0 4px 4px 0;
+  max-height: 240px;
+  padding: 0 0 0 4px;
+  position: relative;
+  overflow-x: hidden;
+  overflow-y: auto;
+  -webkit-overflow-scrolling: touch;
+}
+.chzn-container-multi .chzn-results {
+  margin: -1px 0 0;
+  padding: 0;
+}
+.chzn-container .chzn-results li {
+  display: none;
+  line-height: 15px;
+  padding: 5px 6px;
+  margin: 0;
+  list-style: none;
+}
+.chzn-container .chzn-results .active-result {
+  cursor: pointer;
+  display: list-item;
+}
+.chzn-container .chzn-results .highlighted {
+  background-color: #3875d7;
+  filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#3875d7', endColorstr='#2a62bc', GradientType=0 );  
+  background-image: -webkit-gradient(linear, 0 0, 0 100%, color-stop(20%, #3875d7), color-stop(90%, #2a62bc));
+  background-image: -webkit-linear-gradient(top, #3875d7 20%, #2a62bc 90%);
+  background-image: -moz-linear-gradient(top, #3875d7 20%, #2a62bc 90%);
+  background-image: -o-linear-gradient(top, #3875d7 20%, #2a62bc 90%);
+  background-image: linear-gradient(#3875d7 20%, #2a62bc 90%);
+  color: #fff;
+}
+.chzn-container .chzn-results li em {
+  background: #feffde;
+  font-style: normal;
+}
+.chzn-container .chzn-results .highlighted em {
+  background: transparent;
+}
+.chzn-container .chzn-results .no-results {
+  background: #f4f4f4;
+  display: list-item;
+}
+.chzn-container .chzn-results .group-result {
+  cursor: default;
+  color: #999;
+  font-weight: bold;
+}
+.chzn-container .chzn-results .group-option {
+  padding-left: 15px;
+}
+.chzn-container-multi .chzn-drop .result-selected {
+  display: none;
+}
+.chzn-container .chzn-results-scroll {
+  background: white;
+  margin: 0 4px;
+  position: absolute;
+  text-align: center;
+  width: 321px; /* This should by dynamic with js */
+  z-index: 1;
+}
+.chzn-container .chzn-results-scroll span {
+  display: inline-block;
+  height: 17px;
+  text-indent: -5000px;
+  width: 9px;
+}
+.chzn-container .chzn-results-scroll-down {
+  bottom: 0;
+}
+.chzn-container .chzn-results-scroll-down span {
+  background: url('chosen-sprite.png') no-repeat -4px -3px;
+}
+.chzn-container .chzn-results-scroll-up span {
+  background: url('chosen-sprite.png') no-repeat -22px -3px;
+}
+/* @end */
+
+/* @group Active  */
+.chzn-container-active .chzn-single {
+  -webkit-box-shadow: 0 0 5px rgba(0,0,0,.3);
+  -moz-box-shadow   : 0 0 5px rgba(0,0,0,.3);
+  box-shadow        : 0 0 5px rgba(0,0,0,.3);
+  border: 1px solid #5897fb;
+}
+.chzn-container-active .chzn-single-with-drop {
+  border: 1px solid #aaa;
+  -webkit-box-shadow: 0 1px 0 #fff inset;
+  -moz-box-shadow   : 0 1px 0 #fff inset;
+  box-shadow        : 0 1px 0 #fff inset;
+  background-color: #eee;
+  filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#eeeeee', endColorstr='#ffffff', GradientType=0 );
+  background-image: -webkit-gradient(linear, 0 0, 0 100%, color-stop(20%, #eeeeee), color-stop(80%, #ffffff));
+  background-image: -webkit-linear-gradient(top, #eeeeee 20%, #ffffff 80%);
+  background-image: -moz-linear-gradient(top, #eeeeee 20%, #ffffff 80%);
+  background-image: -o-linear-gradient(top, #eeeeee 20%, #ffffff 80%);
+  background-image: linear-gradient(#eeeeee 20%, #ffffff 80%);
+  -webkit-border-bottom-left-radius : 0;
+  -webkit-border-bottom-right-radius: 0;
+  -moz-border-radius-bottomleft : 0;
+  -moz-border-radius-bottomright: 0;
+  border-bottom-left-radius : 0;
+  border-bottom-right-radius: 0;
+}
+.chzn-container-active .chzn-single-with-drop div {
+  background: transparent;
+  border-left: none;
+}
+.chzn-container-active .chzn-single-with-drop div b {
+  background-position: -18px 2px;
+}
+.chzn-container-active .chzn-choices {
+  -webkit-box-shadow: 0 0 5px rgba(0,0,0,.3);
+  -moz-box-shadow   : 0 0 5px rgba(0,0,0,.3);
+  box-shadow        : 0 0 5px rgba(0,0,0,.3);
+  border: 1px solid #5897fb;
+}
+.chzn-container-active .chzn-choices .search-field input {
+  color: #111 !important;
+}
+/* @end */
+
+/* @group Disabled Support */
+.chzn-disabled {
+  cursor: default;
+  opacity:0.5 !important;
+}
+.chzn-disabled .chzn-single {
+  cursor: default;
+}
+.chzn-disabled .chzn-choices .search-choice .search-choice-close {
+  cursor: default;
+}
+
+/* @group Right to Left */
+.chzn-rtl { text-align: right; }
+.chzn-rtl .chzn-single { padding: 0 8px 0 0; overflow: visible; }
+.chzn-rtl .chzn-single span { margin-left: 26px; margin-right: 0; direction: rtl; }
+
+.chzn-rtl .chzn-single div { left: 3px; right: auto; }
+.chzn-rtl .chzn-single abbr {
+  left: 26px;
+  right: auto;
+}
+.chzn-rtl .chzn-choices .search-field input { direction: rtl; }
+.chzn-rtl .chzn-choices li { float: right; }
+.chzn-rtl .chzn-choices .search-choice { padding: 3px 5px 3px 19px; margin: 3px 5px 3px 0; }
+.chzn-rtl .chzn-choices .search-choice .search-choice-close { left: 4px; right: auto; }
+.chzn-rtl.chzn-container-single .chzn-results { margin: 0 0 4px 4px; padding: 0 4px 0 0; }
+.chzn-rtl .chzn-results .group-option { padding-left: 0; padding-right: 15px; }
+.chzn-rtl.chzn-container-active .chzn-single-with-drop div { border-right: none; }
+.chzn-rtl .chzn-search input {
+  background: #fff url('chosen-sprite.png') no-repeat -30px -20px;
+  background: url('chosen-sprite.png') no-repeat -30px -20px, -webkit-gradient(linear, 0 0, 0 100%, color-stop(1%, #eeeeee), color-stop(15%, #ffffff));
+  background: url('chosen-sprite.png') no-repeat -30px -20px, -webkit-linear-gradient(top, #eeeeee 1%, #ffffff 15%);  
+  background: url('chosen-sprite.png') no-repeat -30px -20px, -moz-linear-gradient(top, #eeeeee 1%, #ffffff 15%);
+  background: url('chosen-sprite.png') no-repeat -30px -20px, -o-linear-gradient(top, #eeeeee 1%, #ffffff 15%);
+  background: url('chosen-sprite.png') no-repeat -30px -20px, linear-gradient(#eeeeee 1%, #ffffff 15%);
+  padding: 4px 5px 4px 20px;
+  direction: rtl;
+}
+.chzn-container-single.chzn-rtl .chzn-single div b {
+  background-position: 6px 2px;
+}
+.chzn-container-single.chzn-rtl .chzn-single-with-drop div b {
+  background-position: -12px 2px;
+}
+/* @end */
+
+/* @group Retina compatibility */
+@media only screen and (-webkit-min-device-pixel-ratio: 2), only screen and (min-resolution: 144dpi)  {
+  .chzn-rtl .chzn-search input, .chzn-container-single .chzn-single abbr, .chzn-container-single .chzn-single div b, .chzn-container-single .chzn-search input, .chzn-container-multi .chzn-choices .search-choice .search-choice-close, .chzn-container .chzn-results-scroll-down span, .chzn-container .chzn-results-scroll-up span {
+      background-image: url('chosen-sprite@2x.png') !important;
+      background-repeat: no-repeat !important;
+      background-size: 52px 37px !important;
+  }
+}
+/* @end */
--- a/resources/jquery.chosen/chosen.jquery.js
+++ b/resources/jquery.chosen/chosen.jquery.js
--- a/resources/mediawiki/mediawiki.htmlform.js
+++ b/resources/mediawiki/mediawiki.htmlform.js
@ -1,7 +1,7 @@
 /**
 * Utility functions for jazzing up HTMLForm elements.
 */
-( function ( $ ) {
+( function ( mw, $ ) {

 	/**
 	 * jQuery plugin to fade or snap to visible state.
@ -59,4 +59,68 @@

 	} );

-}( jQuery ) );
+	function addMulti( $oldContainer, $container ) {
+		var name = $oldContainer.find( 'input:first-child' ).attr( 'name' ),
+		$select = $( '<select>' ),
+		dataPlaceholder = mw.message( 'htmlform-chosen-placeholder' );
+		$select.attr( {
+			name: name,
+			multiple: 'multiple',
+			'data-placeholder': dataPlaceholder.plain(),
+			'class': 'htmlform-chzn-select mw-input'
+		} );
+		$oldContainer.find( 'input' ).each( function () {
+			var $oldInput = $(this),
+			checked = $oldInput.prop( 'checked' ),
+			$option = $( '<option>' );
+			$option.prop( 'value', $oldInput.prop( 'value' ) );
+			if ( checked ) {
+				$option.prop( 'selected', true );
+			}
+			$option.text( $oldInput.prop( 'value' ) );
+			$select.append( $option );
+		} );
+		$container.append( $select );
+	}
+
+	function convertCheckboxesToMulti( $oldContainer, type ) {
+		var $fieldLabel = $( '<td>' ),
+		$td = $( '<td>' ),
+		$fieldLabelText = $( '<label>' ),
+		$container;
+		if ( type === 'table' ) {
+			addMulti( $oldContainer, $td );
+			$container = $( '<tr>' );
+			$container.append( $td );
+		} else if ( type === 'div' ) {
+			$fieldLabel = $( '<div>' );
+			$container = $( '<div>' );
+			addMulti( $oldContainer, $container );
+		}
+		$fieldLabel.attr( 'class', 'mw-label' );
+		$fieldLabelText.text( $oldContainer.find( '.mw-label label' ).text() );
+		$fieldLabel.append( $fieldLabelText );
+		$container.prepend( $fieldLabel );
+		$oldContainer.parent().append( $container );
+		$oldContainer.remove();
+		return $container;
+	}
+
+	if ( $( '.mw-chosen' ).length ) {
+		mw.loader.using( 'jquery.chosen', function () {
+			var $toConvert,
+			$converted;
+			$toConvert = $( 'table .mw-chosen' );
+			if ( $toConvert.length ) {
+				$converted = convertCheckboxesToMulti( $toConvert, 'table' );
+				$converted.find( '.htmlform-chzn-select' ).chosen();
+			}
+			$toConvert = $( 'div .mw-chosen' );
+			if ( $toConvert.length ) {
+				$converted = convertCheckboxesToMulti( $toConvert, 'div' );
+				$converted.find( '.htmlform-chzn-select' ).chosen();
+			}
+		} );
+	}
+
+}( mediaWiki, jQuery ) );