Я пытаюсь использовать JQuery или Javascript, чтобы отобразить дополнительные параметры раскрывающегося меню на основе предыдущего выбора в раскрывающемся списке. Я фактически основал свой JQuery на каком-то другом коде, который нашел на этом сайте, и при необходимости изменил что-то, но он по-прежнему не работает. Надеюсь, кто-нибудь сможет указать, где я ошибся.
HTML:
<html>
<meta charset = "UTF-8" lang = "en">
<head>
<link rel = "stylesheet" type = "text/css" href = "landing.css">
</head>
<header>
<h1>Character Creator</h1>
<script src = "landing_2.js">
"use strict"
</script>
</header>
<body
<form class = "wrapper1">
<label>Race</label>
<select id = "race" name = "race">
<option data='SHOW' value='0'>--Select--</option>
<option value = "Aarakocra">Aarakocra</option>
<option value = "Aasimar">Aasimar</option>
<option value = "Bugbear">Bugbear</option>
<option value = "Dragonborn">Dragonborn</option>
<option value = "Dwarf">Dwarf</option>
<option value = "Elf">Elf</option>
<option value = "Firbolg">Firbolg</option>
<option value = "Genasi">Genasi</option>
<option value = "Gith">Gith</option>
<option value = "Gnome">Gnome</option>
<option value = "Goblin">Goblin</option>
<option value = "Goliath">Goliath</option>
<option value = "Half-Elf">Half-Elf</option>
<option value = "Half-Orc">Half-Orc</option>
<option value = "Halfling">Halfling</option>
<option value = "Hobgoblin">Hobgoblin</option>
<option value = "Human">Human</option>
<option value = "Kenku">Kenku</option>
<option value = "Kobold">Kobold</option>
<option value = "Lizardfolk">Lizardfolk</option>
<option value = "Orc">Orc</option>
<option value = "Serpentblood">Serpentblood</option>
<option value = "Tabaxi">Tabaxi</option>
<option value = "Tiefling">Tiefling</option>
<option value = "Triton">Triton</option>
<option value = "Tortle">Tortle</option>
</select>
<br />
<label>Subrace</label>
<select id = "subrace" name = "subrace">
<option>Select</option>
</select>
<br />
<label>Class</label>
<select id = "class">
<option value = "Barbarian">Barbarian</option>
<option value = "Bard">Bard</option>
<option value = "Cleric">Cleric</option>
<option value = "Druid">Druid</option>
<option value = "Fighter">Fighter</option>
<option value = "Monk">Monk</option>
<option value = "Paladin">Paladin</option>
<option value = "Ranger">Ranger</option>
<option value = "Rogue">Rogue</option>
<option value = "Sorcerer">Sorcerer</option>
<option value = "Warlock">Warlock</option>
<option value = "Wizard">Wizard</option>
</select>
<br />
<label>Background</label>
<select id = "background">
<option value = "Acolyte">Acolyte</option>
<option value = "Barbarian Tribe Member">Barbarian Tribe Member</option>
<option value = "Charlatan">Charlatan</option>
<option value = "City Watch">City Watch</option>
<option value = "Clan Crafter">Clan Crafter</option>
<option value = "Cloistered Scholar">Cloistered Scholar</option>
<option value = "Coutier">Courtier</option>
<option value = "Criminal">Criminal</option>
<option value = "Custom">Custom</option>
<option value = "Entertainer">Entertainer</option>
<option value = "Faction Agent">Faction Agent</option>
<option value = "Far Traveler">Far Traveler</option>
<option value = "Folk Hero">Folk Hero</option>
<option value = "Guild Artisan">Guild Artisan</option>
<option value = "Haunted One">Haunted One</option>
<option value = "Hermit">Hermit</option>
<option value = "Inheritor">Inheritor</option>
<option value = "Knight">Knight</option>
<option value = "Mercenary Veteran">Mercenary Veteran</option>
<option value = "Noble">Noble</option>
<option value = "Outlander">Outlander</option>
<option value = "Port City Noble">Port City Noble</option>
<option value = "Sage">Sage</option>
<option value = "Sailor">Sailor</option>
<option value = "Soldier">Soldier</option>
<option value = "Urban Bounty Hunter">Urban Bounty Hunter</option>
<option value = "Urchin">Urchin</option>
</select>
<br />
<br />
<label>Alignment</label>
<select id = "alignment">
<option value = "LG">Lawful Good</option>
<option value = "LG">Neutral Good</option>
<option value = "LG">Chaotic Good</option>
<option value = "LG">Lawful Neutral</option>
<option value = "LG">True Neutral</option>
<option value = "LG">Chaotic Neutral</option>
<option value = "LG">Lawful Evil</option>
<option value = "LG">Neutral Evil</option>
<option value = "LG">Chaotic Evil</option>
</select>
<div class = "racedes">
<input type = "text" id = "racedes" value = "Race Description">
</div>
<div class = "classdes">
<input type = "text" id = "classdes" value = "Class Description">
</div>
<div class = "backdes">
<input type = "text" id = "backdes" value = "Background Description">
</div>
<div class = "aligndes">
<input type = "text" id = "aligndes" value = "Alignment Description">
</div>
</form>
<div class = "img">
<img src = "aarakocra_barbarian.png" alt = "Aarakocra Barbarian" >
<img src = "aarakocra_bard.png" alt = "Aarakocra Bard" hidden>
<img src = "aarakocra_cleric.png" alt = "Aarakocra Cleric" hidden>
<img src = "aasimar_barbarian.png" alt = "Aasimar Barbarian" hidden>
<img src = "aasimar_bard.png" alt = "Aasimar Bard" hidden>
<img src = "aasimar_cleric.png" alt = "Aasimar Cleric" hidden>
</div>
</body>
</html>
JQuery:
jQuery(function($){
var subraces = {
'0' : ['---Select---'],
'Aarakocra' : ['No subrace available'],
'Aasimar' : ['DMG Version', 'Protector Aasimar', 'Scourge Aasimar',
'Fallen Aasimar'],
'Bugbear' : ['No subrace available'],
'Dragonborn' : ['Black', 'Blue', 'Brass', 'Bronze', 'Copper', 'Gold',
'Green', 'Red', 'Silver', 'White'],
'Dwarf' : ['Druegar', 'Hill Dwarf', 'Mountain Dwarf'],
'Elf' : ['Dark Elf', 'Eladrin - DMG Version', 'Eladrin - MToF Version',
'High Elf', 'Sea Elf', 'Shadar-Kai', 'Wood Elf'],
'Firbold' : ['No subrace available'],
'Genasi' : ['Air', 'Earth', 'Fire', 'Water'],
'Gith' : ['Githyanki', 'Githzerai'],
'Gnome': ['Deep Gnome', 'Forest Gnome', 'Rock Gnome'],
'Goblin' : ['No subrace available'],
'Goliath' : ['No subrace available'],
'Half-Elf' : ['Half-Elf', 'Variant'],
'Half-Orc' : ['No subrace available'],
'Halfling' : ['Ghastly', 'Lightfoot', 'Stout'],
'Hobgoblin' : ['No subrace availale'],
'Human' : ['Human', 'Variant'],
'Kenku' : ['No subrace available'],
'Kobold' : ['No subrace available'],
'Lizardfolk' : ['No subrace available'],
'Orc' : ['No subrace available'],
'Serpentblood': ['No subrace available'],
'Tabaxi' : ['No subrace available'],
'Tiefling' : ['Tiefling', 'Feral', 'Lineage of Baalzebul', 'Lineage of
Dispater', 'Lineage of Fierna', 'Lineage of Glasya', 'Lineage of
Levistus', 'Lineage of Mammon', 'Lineage of Mephistopheles', 'Lineage of
Zariel', 'Variant'],
'Triton' : ['No subrace available'],
'Tortle' : ['No subrace available']
}
var $subraces = $('#subrace');
$('#race').change(function () {
var race = $(this).val(), subs = subraces[race] || [];
var html = $.map(sub, function(sub){
return '<option value = "' + sub + '">' + sub + '</option>'
}).join('');
$subraces.html(html)
});
});

Используйте подпрограммы вместо подпрограммы. Измените функцию карты на это:
var html = $.map(subs, function(sub) {
return '<option value = "' + sub + '">' + sub + '</option>'
}).join('');