+ // Show a byte-counter to users with how many bytes are left for their edit summary.
+ // TODO: This looks a bit weird, as there is no unit in the UI, just numbers; showing
+ // 'bytes' confused users in testing, and showing 'chars' would be a lie. See T42035.
+ if ( $( '#editform' ).hasClass( 'mw-editform-ooui' ) ) {
+ mw.loader.using( 'oojs-ui-core' ).then( function () {
+ var wpSummary = OO.ui.infuse( $( '#wpSummaryWidget' ) );
+
+ function updateSummaryLabelCount() {
+ wpSummary.setLabel( String( 255 - $.byteLength( wpSummary.getValue() ) ) );
+ }
+
+ wpSummary.on( 'change', updateSummaryLabelCount );
+ // Initialise value
+ updateSummaryLabelCount();
+ } );
+ }
+