wikimedia/mediawiki-core

/*!
 * Scripts for WatchlistExpiry on action=edit
 */
'use strict';

// Toggle the watchlist-expiry dropdown's disabled state according to the
// selected state of the watchthis checkbox.
$( function () {
    // The 'wpWatchthis' and 'wpWatchlistExpiry' fields come from EditPage.php.
    var watchThisNode = document.getElementById( 'wpWatchthisWidget' ),
        expiryNode = document.getElementById( 'wpWatchlistExpiryWidget' );

    if ( watchThisNode && expiryNode ) {
        var watchThisWidget = OO.ui.infuse( watchThisNode );
        var expiryWidget = OO.ui.infuse( expiryNode );
        // Set initial state to match the watchthis checkbox.
        expiryWidget.setDisabled( !watchThisWidget.isSelected() );

        // Change state on every change of the watchthis checkbox.
        watchThisWidget.on( 'change', function ( enabled ) {
            expiryWidget.setDisabled( !enabled );
        } );
    }
} );