Alert Messages

Lana1993 · 09-26-2012, 04:34 AM

Hi there,

I am trying to make alert messages for when neither a flight nor seating preference has been made, and it's a struggle. Any help would be amazing.

Code:

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;
charset=utf-8">
<title>gotham airlines</title>
<script>

function calculateCost() {

for (var i = 1; i < 7; i++) {
var radiobutton = document.getElementById("flight" + i);
if (radiobutton.checked == true) {
var base=radiobutton.value;
}
}
var rtn=document.getElementById("returnfare").checked?2:1;
for (var a = 1; a < 4; a++) {
var radiobutton = document.getElementById("seating" + a);
if (radiobutton.checked == true) {
var seatclass=radiobutton.value;
}
}
var cost=base*rtn*seatclass;
alert("The selected flight will cost $" + cost);
}

</script>
</head>
<body>
<h1>Gotham Airlines Fare Calculator</h1>
<form>
<p>Complete the form below to calculate the cost of your flight.</p>
Route:<br>
<p><input type="radio" id="flight1" name="flights"
value="230"> <label for="flight1">Gotham - Hill Valley</label><br>
<input type="radio" id="flight2" name="flights"
value="250"> <label for="flight2">Gotham - Las Venturas</label><br>
<input type="radio" id="flight3" name="flights"
value="190"> <label for="flight3">Gotham - Storybrooke</label><br>
<input type="radio" id="flight4" name="flights"
value="160"> <label for="flight4">Gotham - Marlinshire</label><br>
<input type="radio" id="flight5" name="flights"
value="270"> <label for="flight5">Gotham - Lillian</label><br>
<input type="radio" id="flight6" name="flights"
value="220"> <label for="flight6">Gotham - Seahaven</label></p>

<p><input type="checkbox" id="returnfare" name="return fare"
value="2"> <label for="returnfare">Click here if you will be purchasing a return fare</label></p>

Seating:<br>
<p><input type="radio" id="seating1" name="seating"
value="2"> <label for="seating1">First class</label><br>
<input type="radio" id="seating2" name="seating"
value="1.5"> <label for="seating2">Business class</label><br>
<input type="radio" id="seating3" name="seating"
value="1"> <label for="seating3">Economy class</label></p>
<p><input type="submit" value="Calculate"
onClick="calculateCost();"> <input type="reset"></p>
</form>
</body>
</html>

VIPStephan · 09-26-2012, 10:22 AM

If you post any code please put it in between [CODE][/CODE] tags. It makes scanning your posts much easier. You can do this by clicking the small ‘#’ icon above the reply field.

WolfShade · 09-26-2012, 01:39 PM

You need to declare a variable and set it to 0 at the start, then add to it if a button is checked. If the variable still == 0, no buttons have been checked.

Code:

function calculateCost() { 
var totalChkd = 0; 
for (var i = 1; i < 7; i++) { 
var radiobutton = document.getElementById("flight" + i); 
if (radiobutton.checked == true) { 
var base=radiobutton.value; totalChkd++; 
} 
} 
var rtn=document.getElementById("returnfare").checked?2:1; 
for (var a = 1; a < 4; a++) { 
var radiobutton = document.getElementById("seating" + a); 
if (radiobutton.checked == true) { 
var seatclass=radiobutton.value; totalChkd++;  
} 
}
if(totalChkd < 2){ 
alert("Please select both flight and seat"); return false;
} 
var cost=base*rtn*seatclass; 
alert("The selected flight will cost $" + cost); 
}

Then change your submit button:

Code:

<input type="submit" value="Calculate" onClick="return calculateCost();">

Lana1993 · 09-27-2012, 01:17 AM

Wow, thank you. I did all kinds of different things, none of which actually worked. Thank you heaps x

felgall · 09-27-2012, 03:04 AM

What is supposed to happen when the person clicks on the checkbox in the alert that turns off JavaScript?