[英]How to use an input from a select option in html with javascript?
我想為一個唯一的ID分配一個下拉選項,以便在選擇該ID時,JavaScript將采用該ID,並將其轉換為變量,我可以用它來顯示成本。
這是我到目前為止的內容:
<form>
<select>
<option name ="Bristol "value="40.0" id="BN1">Bristol - Newcastle</option>
</select>
<button type="button" onclick="BookingFare(); return false;">Submit</button><br>
</form>
function BookingFare() {
var price = 0;
//var ofAdults = document.getElementById('adults').value;
//var ofChildren = document.getElementById('children').value;
var BN1 = document.getElementById('BN1').value;
if (BN1) {
var price = price + 40;
}
document.getElementById('priceBox').innerHTML = price;
}
我無法顯示價格,即使選擇BN1時我只是試圖將其打印為“你好”,也不起作用。 誰能告訴我我所缺少的嗎?
function BookingFare() { var price = 0; //var ofAdults = getElementById('adults').value; //var ofChildren = getElementById('children').value; var BN1 = document.getElementById('BN1').value; if (BN1) { var price = price + 40; } document.getElementById('priceBox').innerHTML = price; }
<form> <select id="BN1"> <option name ="Bristol "value="40.0" >Bristol - Newcastle</option> </select> <button type="button" onclick="BookingFare(); return false;">Submit</button><br> </form> <label id='priceBox'></label>
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