Javascript code that DISPLAYS the radio button value in a text box that also checks for the drop down value and displays a certain array value depending on the radio value choosen for the drop down se

<!DOCTYPE html>

<head>

<script>

function Dropcity() {

var select = document.getElementById('dropcity');

var option = select.options[select.selectedIndex];

document.getElementById('displaycity').value = option.value;

document.getElementById('value').value = option.text;

}

function Popnums()

{

}

</script>

<style>

body{

background-color: #d9f2d9;

margin-top: 50px;

font-family: Arial, Helvetica, sans-serif

button{

margin-top: 20px;

margin-left: 210px;

border: 3px solid black;

background-color: antiquewhite;

.assign{

text-align: center;

border: 2px solid black;

width: 250px;

margin: auto;

background-color: #ffcc33;

font-size: 20px;

.cs{

text-align: center;

border: 2px solid black;

width: 250px;

margin: auto;

background-color: #ffeecc;

font-size: 18px;

.sc{

text-align: center;

border: 2px solid black;

width: 250px;

margin: auto;

border-bottom: none;

background-color: #ffccb3;

font-size: 20px;

.cp{

text-align: center;

border: 2px solid black;

width: 250px;

margin: auto;

border-top: none;

background-color: #ffccb3;

font-size: 20px;

.fpop{

margin: auto;

width: 450px;

.tCities{

border-spacing: 1em;

.cname{

background-color: lightblue;

border: 3px solid black;

width: 270px;

font-weight: normal;

font-size: 20px;

.popyr{

float: right;

margin-right: 200px;

border-collapse: collapse;

.popnum{

margin-top: 20px;

margin-left: 160px;

border-collapse: collapse;

width: 270px;

.city{

background-color: lightblue;

border: 3px solid black;

width: 75px;

font-size: 15px;

.cn{

border: 2px solid black;

background-color: #ffcc33;

padding: 2px;

option{

background-color: #d9f2d9;

border: 2px solid black;

border-color: black;

.yr{

border: 3px solid black;

background-color: red;

text-align: center;

width: 80px;

.pop, .popnumber{

border: 3px solid black;

text-align: center;

.pop{

background-color: #4d9900;

width: 140px;

font-size: 20px;

.popnumber{

background-color: #ffeecc;

width: 100px;

.rb{

padding-right: 15px;

.dcn{

border: none;

background-color: transparent;

appearance: none;

width: 75px;

outline: none;

#displaycity{

background-color: #ffdf80;

border: 3px solid black;

width: 270px;

text-align: center;

#rb_years{

text-align: center;

margin-top: 45px;

margin-left: 100px;

border-collapse: collapse;

#yr_00{

border: 3px solid black;

border-bottom: 2px solid black;

padding-top: 2px;

padding-left: 27px;

padding-right: 25px;

padding-bottom: 10px;

#yr_20{

border: 3px solid black;

border-top: 2px solid black;

border-bottom: 1px solid black;

background-color: #4d9900;

padding-top: 2px;

padding-left: 27px;

padding-right: 25px;

padding-bottom: 3px;

#yr_21{

border: 3px solid black;

border-top: 1px solid black;

padding-top: 2px;

padding-left: 27px;

padding-right: 25px;

padding-bottom: 3px;

#pop_num{

background-color: transparent;

text-align: center;

border: transparent;

</style>

</head>

<html>

<body>

<p class="assign">Assignment-03</p>

<br>

<p class="cs">Control Structures</p>

<br>

<br>

<p class="sc">State of California</p>

<p class="cp">Cities Population</p>

<br>

<!-- Table for Cities -->

<form class="fpop">

<table class="tCities">

<thead>

<tr>

<th class="city">Cities</th>

<th style="width: 73px;"></th>

<th class="cname">Name</th>

</tr>

<tr>

<td>

<div>

<label for="cityname" class="cn">

<select name="dropcity" id="dropcity" class="dcn" onchange="Dropcity()">

<option selected="selected" value=""></option>

<option id="cityn" value="San Diego">SD</option>

<option value="San Jose">SF</option>

<option value="San Francisco">SJ</option>

<option value="Sacramento">SAC</option>

<option value="San Bernardino">SB</option>

<option value="Los Angeles">LA</option>

</select>

</label>

</div>

</td>

<td></td>

<td><input name="displaycity" type="text" id="displaycity" readonly/></td>

</tr>

</thead>

</table>

<br>

<!-- Table for Population Years -->

<table class="popyr">

<tr>

<td></td>

<td class="yr">Year</td>

</tr>

<tr>

<td style="height: 15px;"></td>

</tr>

</table>

<!-- Radio Buttons -->

<table id="rb_years" >

<tr>

<th>&nbsp;<input type="radio" name="year" class="year" value="yr">Op</th>

<td cellspacing="0"><label id="yr_00">2000</label></td>

</tr>

<tr>

<th>&nbsp; <input type="radio" name="year" value="yr">Opt</th>

<td><label id="yr_20">2020</label></td>

</tr>

<tr>

<th>&nbsp;<input type="radio" name="year" value="yr">Op</th>

<td><label id="yr_21">2021</label></td>

</tr>

</table>

<!-- Table for Population Numbers -->

<table class="popnum">

<tr>

<td class="pop">Population</td>

<td class="popnumber"><input name="pop_num1" type="text" id="pop_num" onchange="Popnums()" readonly/></td>

</tr>

</table>

</form>

<!-- Submit Button -->

<button type="button">SUBMIT</button>

</body>

</html>