W3Schools +

W3Schools with more freedom

You will need to install an extension such as Tampermonkey, Greasemonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Userscripts to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install a user script manager extension to install this script.

(I already have a user script manager, let me install it!)

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

(I already have a user style manager, let me install it!)

// ==UserScript==
// @name         W3Schools +
// @namespace    https://greasyfork.org/users/37096/
// @homepage     https://greasyfork.org/scripts/33021/
// @supportURL   https://greasyfork.org/scripts/33021/feedback
// @version      1.1.4
// @description  W3Schools with more freedom
// @author       Hồng Minh Tâm
// @match        https://www.w3schools.com/*/*.asp
// @match        https://www.w3schools.com/*/*.asp*
// @icon         https://www.w3schools.com/favicon.ico
// @require      https://ajax.googleapis.com/ajax/libs/jquery/2.2.4/jquery.min.js
// @require      https://greasyfork.org/scripts/30368-highlight-words-jquery-library/code/Highlight%20Words%20Jquery%20Library.js?version=199098
// @compatible   chrome
// @compatible   firefox
// @compatible   opera
// @license      GNU GPLv3
// @grant        GM_addStyle
// ==/UserScript==
 
(function() {
    'use strict';
 
    GM_addStyle([
        '@import "https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css";',
        '#list-title-children { background-color: #dbefdc; }',
        '#list-title-children a { padding-left: 30px; }',
        '#list-title-children a.active { color: #000000; background-color: #b7dfb8; }',
        '#leftmenuinner { display: -webkit-box; display: -moz-box; display: -webkit-flex; display: flex; -webkit-box-orient: vertical; -moz-box-orient: vertical; -webkit-flex-direction: column; flex-direction: column; }',
        '#input-filter { width: 100%; padding: 5px 1px 5px 14px; color: #000; background-color: #fff; border: 1px solid #ccc; }',
        '#leftmenuinnerinner { overflow-y: auto; }',
        'input#input-filter::-webkit-input-placeholder { font-family: Arial, Helvetica, sans-serif, FontAwesome; }',
        'input#input-filter::-moz-placeholder { font-family: Verdana, sans-serif, FontAwesome; }',
        'input#input-filter::-ms-input-placeholder { font-family:  Verdana, sans-serif, FontAwesome; }',
        'input#input-filter:not(:placeholder-shown) { background-color: #FFFF88; }',
        'input#input-filter[type="search"]::-webkit-search-cancel-button { -webkit-appearance: searchfield-cancel-button; }',
        '.highlight { background-color: #FFFF88; color: #000; }',
    ].join('\n'));
 
    var $main = $('#main');
    var $leftmenuinner = $('#leftmenuinner');
    var $leftmenuinnerinner = $('#leftmenuinnerinner');
    var $titleParent = $leftmenuinnerinner.find('a[target = "_top"].active:eq(0)');
 
    var $listTitleChild = $('<div/>', {
        id: 'list-title-children'
    }).insertAfter($titleParent);
 
    var $iconTitleParent = $('<i/>', {
        class: 'fa fa-caret-up'
    });
    $titleParent.append(' ').append($iconTitleParent);
    $titleParent.click(function(e) {
        $listTitleChild.slideToggle();
        $iconTitleParent.toggleClass('fa-caret-down fa-caret-up');
        return false;
    });
 
    var index = 0;
    $main.children('h2').each(function() {
        if($(this).prop('tagName') === "H1" || $(this).prop('tagName') === "H2") {
            var idTitleChildren = 'title-'+ (++index);
            $(this).attr({
                'data-id': idTitleChildren,
                class: 'title-children-section'
            });
            var $titleChildren = $('<a/>', {
                href: '#'+idTitleChildren,
                class: 'item-title-children'
            }).text($(this).text()).appendTo($listTitleChild);
        }
    });
 
    var $titleChildrens = $('.item-title-children');
    var $titleChildrenSections = $('.title-children-section');
 
    $titleChildrens.click(function(e) {
        e.preventDefault();
        $(document).off('scroll');
        $titleChildrens.removeClass('active');
        $(this).addClass('active');
 
        var target = this.hash.replace('#', ''),
            $target = $('h2[data-id="'+target+'"]');
 
        $('html, body').stop().animate({
            'scrollTop': $target.offset().top - $('#topnav').height() - 5
        }, 300, 'swing', function() {
            window.location.hash = target;
            $(document).on('scroll', onScroll);
        });
    });
 
    $(document).on('scroll', onScroll);
    if(window.location.hash) {
        $titleChildrens.filter('[href^="'+window.location.hash+'"]').click();
    }
    function onScroll(e) {
        var scrollPosition = $(document).scrollTop() + $('#topnav').height() + 10;
        $titleChildrenSections.each(function(index, element) {
            var $next = $titleChildrenSections.eq(index + 1);
            var target = $(this).data('id');
            if($(this).position().top < scrollPosition && ($next.position()?$next.position().top:($main.position().top+$main.height())) - 10 > scrollPosition) {
                $titleChildrens.removeClass('active');
                $titleChildrens.filter('[href^="#'+target+'"]').addClass('active');
                window.location.hash = target;
            } else {
                $titleChildrens.filter('[href^="#'+target+'"]').removeClass('active');
            }
        });
    }
 
    var $inputFilter = $('<input/>', {
        type: 'search',
        id: 'input-filter',
        placeholder: $('<div/>').html('&#xf0b0; Filter').html()
    }).prependTo($leftmenuinner);
    $inputFilter.on('input', function(e) {
        var filterValue = $(this).val().toLowerCase();
        $leftmenuinnerinner.find('a[target = "_top"]').each(function(index, item) {
            $(item).unhighlight().highlight(filterValue);
            if($(item).text().toLowerCase().indexOf(filterValue) > -1) {
                $(item).show();
            } else {
                $(item).hide();
            }
        });
        $titleChildrens.each(function(index, item) {
            $(item).unhighlight().highlight(filterValue);
            if($(item).text().toLowerCase().indexOf(filterValue) > -1) {
                $(item).show();
                $titleParent.show();
            } else {
                $(item).hide();
            }
        });
        $leftmenuinnerinner.find('h2').each(function(index, item) {
            if($(item).nextUntil('br').filter(':visible:not(#list-title-children)').size()) {
                $(item).show();
                $(item).nextAll('br:eq(0)').show();
            } else {
                $(item).hide();
                $(item).nextAll('br:eq(0)').hide();
            }
        });
    });
})();