1 files changed, 66 insertions, 0 deletions
diff --git a/www/wiki/resources/src/mediawiki.action/mediawiki.action.edit.collapsibleFooter.js b/www/wiki/resources/src/mediawiki.action/mediawiki.action.edit.collapsibleFooter.js
new file mode 100644
index 00000000..938962f3
--- /dev/null
+++ b/www/wiki/resources/src/mediawiki.action/mediawiki.action.edit.collapsibleFooter.js
@@ -0,0 +1,66 @@
+( function ( mw ) {
+	var collapsibleLists, handleOne;
+
+	// Collapsible lists of categories and templates
+	// If changing or removing a storeKey, ensure there is a strategy for old keys.
+	// E.g. detect existence via requestIdleCallback and remove. (T121646)
+	collapsibleLists = [
+		{
+			listSel: '.templatesUsed ul',
+			togglerSel: '.mw-templatesUsedExplanation',
+			storeKey: 'mwedit-state-templatesUsed'
+		},
+		{
+			listSel: '.hiddencats ul',
+			togglerSel: '.mw-hiddenCategoriesExplanation',
+			storeKey: 'mwedit-state-hiddenCategories'
+		},
+		{
+			listSel: '.preview-limit-report-wrapper',
+			togglerSel: '.mw-limitReportExplanation',
+			storeKey: 'mwedit-state-limitReport'
+		}
+	];
+
+	handleOne = function ( $list, $toggler, storeKey ) {
+		var collapsedVal = '0',
+			expandedVal = '1',
+			// Default to collapsed if not set
+			isCollapsed = mw.storage.get( storeKey ) !== expandedVal;
+
+		// Style the toggler with an arrow icon and add a tabIndex and a role for accessibility
+		$toggler.addClass( 'mw-editfooter-toggler' ).prop( 'tabIndex', 0 ).attr( 'role', 'button' );
+		$list.addClass( 'mw-editfooter-list' );
+
+		$list.makeCollapsible( {
+			$customTogglers: $toggler,
+			linksPassthru: true,
+			plainMode: true,
+			collapsed: isCollapsed
+		} );
+
+		$toggler.addClass( isCollapsed ? 'mw-icon-arrow-collapsed' : 'mw-icon-arrow-expanded' );
+
+		$list.on( 'beforeExpand.mw-collapsible', function () {
+			$toggler.removeClass( 'mw-icon-arrow-collapsed' ).addClass( 'mw-icon-arrow-expanded' );
+			mw.storage.set( storeKey, expandedVal );
+		} );
+
+		$list.on( 'beforeCollapse.mw-collapsible', function () {
+			$toggler.removeClass( 'mw-icon-arrow-expanded' ).addClass( 'mw-icon-arrow-collapsed' );
+			mw.storage.set( storeKey, collapsedVal );
+		} );
+	};
+
+	mw.hook( 'wikipage.editform' ).add( function ( $editForm ) {
+		var i;
+		for ( i = 0; i < collapsibleLists.length; i++ ) {
+			// Pass to a function for iteration-local variables
+			handleOne(
+				$editForm.find( collapsibleLists[ i ].listSel ),
+				$editForm.find( collapsibleLists[ i ].togglerSel ),
+				collapsibleLists[ i ].storeKey
+			);
+		}
+	} );
+}( mediaWiki ) );