select html
<select class="form-control">
<option>1</option>
<option>2</option>
<option>3</option>
<option>4</option>
<option>5</option>
</select>select html
<select class="form-control">
<option>1</option>
<option>2</option>
<option>3</option>
<option>4</option>
<option>5</option>
</select>select html
<select id="car" onchange="ChangeCarList()">
<option value="">-- Car --</option>
<option value="VO">Volvo</option>
<option value="VW">Volkswagen</option>
<option value="BMW">BMW</option>
</select>
<select id="carmodel"></select>
let carsAndModels = {};
carsAndModels['VO'] = ['V70', 'XC60', 'XC90'];
carsAndModels['VW'] = ['Golf', 'Polo', 'Scirocco', 'Touareg'];
carsAndModels['BMW'] = ['M6', 'X5', 'Z3'];
function ChangeCarList() {
let selCar = car.options[car.selectedIndex].value;
while (carmodel.options.length) {
carmodel.remove(0);
}
let cars = carsAndModels[selCar];
if (cars) {
var i;
for (i = 0; i < cars.length; i++) {
let car = new Option(cars[i], i);
carmodel.options.add(car);
}
}
}Copyright © 2021 Codeinu
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