Display a notice at top of questions, showing whether you've already close-voted.

CVReminder.user.js

// ==UserScript==
// @name         Close Vote Reminder
// @namespace    https://gist.github.com/mogsdad/767f8adc04d1d5c732c9
// @version      1.0
// @description  Display a notice at top of questions, showing whether you've already close-voted.
// @author       Mogsdad
// @include      /^https?://\w*.?(stackoverflow|stackexchange|serverfault|superuser|askubuntu|stackapps)\.com/(questions|posts|review)/*
// @grant        none
// ==/UserScript==
/* jshint -W097 */
'use strict';

(function(){
    var headerWidth = $('#header').width();
    var logoWidth = $('#hlogo').width();
    var navWidth = $('#hmenus').width();
    var availableWidth = headerWidth - (logoWidth + navWidth);

    var noticeHolder = $('<div/>').css({'position':'absolute','left':logoWidth + 'px','font-size':'2em','font-weight':'bold','line-height':'75px','width':availableWidth + 'px','text-align':'center'});
    $('#hmenus').before(noticeHolder);

    //$(document).ajaxComplete(function() {
    $(document).ready(function() {
        var msg = "";
        var alreadyvoted = $( ".close-question-link[title^='You voted']" );
        //console.log( "alreadyvoted:"+alreadyvoted.length );
        var closed = $( ".question-status:contains('put on hold')" );
        //console.log( "closed:"+closed.length );
        if (alreadyvoted.length) {
            msg = '<span style="color:maroon">Previously voted.</span>';
        }
        else if (closed.length) {
            msg = '<span style="color:maroon">Question closed.</span>';
        }
        else {
            msg = '<span style="color:green">Please vote!</span>';
        }
        noticeHolder.html( msg );
    });
})();