Double Numbers Not Working Right

[glenelkins]

Hi

 

I have 2 vars:

 

var price = 0.50;

var delivery = 10.00;

 

if i do:

 

price = price + delivery;

 

the output of price comes at : 0.5010  when it should be 10.50

 

any ideas?

 

[rhodesa]

i get 10.5

<script type="text/javascript">
var price = 0.50;
var delivery = 10.00;
price = price + delivery;
alert(price);
</script>

 

how are you getting these numbers? from text fields or something? cus then they would be strings and javascript will use concatenation. make sure they are float numbers with parseFloat():

<script type="text/javascript">
var price = document.getElementById('price').value;
var delivery = document.getElementById('delivery').value;
price = parseFloat(price) + parseFloat(delivery);
alert(price);
</script>

[glenelkins]

hi

 

ok that worked to an extent. But when its multiplying 0.50 by 10.00 it comes out as 10.5  i want it to say 10.50

[rhodesa]

price.toFixed(2);

will format it to have 2 decimals

[gathos]

hehe i just posted something similar, what is happening is that your variables are strings, so it's adding two strings together, not numbers.

 

a way that i was to to fix it was

 

price = +price + +delivery;

it turns them from a string into a integer.

i hope this helped.

[rhodesa]

hehe i just posted something similar, what is happening is that your variables are strings, so it's adding two strings together, not numbers.

 

a way that i was to to fix it was

 

price = +price + +delivery;

it turns them from a string into a integer.

i hope this helped.

 

interesting...i've never seen a double plus used like that before. i always use parseInt(). but also, the OP needs FLOATs, not INTs

[glenelkins]

gathos... thats cool, but im using doubles ( floating point ) not integers

 

but thanks anyway

[glenelkins]

price = parseFloat ( price ) - parseFloat ( delivery_cost );

 

price.toFixed(2);

 

 

 

price is stil coming out as a 1 decimal place

[rhodesa]

i get 2 decimals with the following:

<script>
  var price = '0.50';
  var delivery_cost = '10.00';
  price = parseFloat(price) + parseFloat(delivery_cost);
  price = price.toFixed(2);
  alert(price);
</script>