repository-relative path which responds with an audio
         file). Pass a falsy value to disable audio alerts. Returns
         this.
      */
      setNewMessageSound: function f(uri){
        delete this.playNewMessageSound.audio;
        this.playNewMessageSound.uri = uri;
        this.settings.set('audible-alert', uri);
        return this;
      }
    };
    F.fetch.beforesend = ()=>cs.ajaxStart();
    F.fetch.aftersend = ()=>cs.ajaxEnd();
    cs.e.inputCurrent = cs.e.inputSingle;
    /* Install default settings... */

      /* Disabled per chatroom discussion: selection list of audio files for
         chat notification. */
      settingsOps.selectSound = D.addClass(D.div(), 'menu-entry');
      const selectSound = D.select();
      D.append(settingsOps.selectSound,
               D.append(D.span(),"Audio alert"),
               selectSound);

      D.option(selectSound, "", "(no audio)");
      const firstSoundIndex = selectSound.options.length;
      F.config.chat.alerts.forEach(function(a){
        D.option(selectSound, a);
      });
      if(true===Chat.settings.getBool('audible-alert')){
        selectSound.selectedIndex = firstSoundIndex;
      }else{
        selectSound.value = Chat.settings.get('audible-alert','');
        if(selectSound.selectedIndex<0){
          /*Missing file - removed after this setting was applied. Fall back
            to the first sound in the list. */
          selectSound.selectedIndex = firstSoundIndex;
        }
      }
      selectSound.addEventListener('change',function(){
        const v = this.value;
        Chat.setNewMessageSound(v);
        F.toast.message("Audio notifications "+(v ? "enabled" : "disabled")+".");
        if(v) setTimeout(()=>Chat.playNewMessageSound(), 0);
      }, false);
      Chat.setNewMessageSound(selectSound.value);
    }/*audio notification config*/
    /**

      }
      D.append(line, btn);
      D.append(optionsMenu, line);
    });
    if(settingsOps.selectSound){
      D.append(optionsMenu, settingsOps.selectSound);
    }
    //settingsButton.click()/*for for development*/;
  })()/*#chat-settings-button setup*/;
  
  /** Callback for poll() to inject new content into the page.  jx ==
      the response from /chat-poll. If atEnd is true, the message is
      appended to the end of the chat list (for loading older
      messages), else the beginning (the default). */
  const newcontent = function f(jx,atEnd){