How Do I Check Conditions Using if else using Html With Jquery?

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<HTML>
<HEAD>
<TITLE> "CALCULATE FUEL COST" </TITLE>
<SCRIPT LANGUAGE = "JavaScript">
function fuelCalculator() {
var costpergallon;
costpergallon= (document.form1.ppg.value / (100 - document.form1.my_select.value))*100 / 12 // document.form1.mpg.value;
document.form1.cpg.value = costpergallon;
//document.write(costpergallon);
}
</script>
</head>
<Body>
Sampath Bank
<form name ="form1">
Amount :<input type="text" name="ppg" value=0 /> </br>
Installments : <select id="my_select" name="my_select">
  <option value="9.25">3</option>
  <option value="10.75">6</option>
  <option value="13.75">12</option>
  <option value="20.25">24</option>
  <option value="24.75">36</option>
  <option value="48">48</option>
  <option value="60">60</option>
</select> </br>
<input type="text" name="mpg" value=0 /> </br>
<input type="text" name="Airfare" value=0 /> </br>
<input type="text" name="AirlineTax" value=0 /> </br>
<input type="text" name="HotelExp" value=0 /> </br>
<input type="text" name="ToursExp" value=0 /> </br>
<input type="text" name="cpg" value=0 /> </br>
<input type= "button" value="Calculate" onclick="fuelCalculator();" />
</form>
</body>
</html>

this is my code?

i want to put if else condition.

if (my_select == 9.25){
var val1= 12;
var total;
total = val1*9.25 }

else
if (my_select == 10.75){
var val1= 6;
var total;
total = val1*10.75 }
}

How can i do that?

Posted 18-Feb-15 0:24am

Hemas Ilearn

Updated 18-Feb-15 16:23pm

v4

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Suvendu Shekhar Giri 18-Feb-15 6:28am

Seems, you know what you want to do, then what is the issue doing this?

1 solution

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TheRealSteveJudge · Answer 1 · 2015-02-18T01:11:00

Solution 1

This is not a final solution,
as it is not clear what you want to calculate,
but shall show you how to get the values from the select tag:

C#

function fuelCalculator() {
    var input = document.getElementById('my_select');
    var value = input.options[input.selectedIndex].value;

    alert(value);

    var total = value * 12;

    alert(total);
}

Hopefully this will help you to proceed!

This does not use JQuery but plain javascript.
Below you find a good resource for learning it:
http://www.w3schools.com/js/default.asp[^]

Posted 18-Feb-15 1:11am

TheRealSteveJudge

Comments

Hemas Ilearn 18-Feb-15 22:26pm

i want if else conditions?

because if(input.selectedIndex==13.75){
var total = 13.75*12
}
else(input.selectedIndex==10.75){
var total = 10.75*6
}

like that.

please it will be very helpful for me if you can solve this issue?
i don't have much experience in html as well

TheRealSteveJudge 19-Feb-15 2:44am

There is no need for if/else statements here.
Please try the suggested function.
It just gets the selected value which is in range 9.25 ... 60.