Problem rounding decimal in my code. HELP!

Discussion in 'JavaScript' started by pdorais75, Apr 29, 2008.

0
  1. #1
    I create a small script for calculate the amount of water a certain size of content can hold. But i can't figure what to add to my script for round the decimal to 2 max.

    Here à copie of the working script and html code, please show me what to modify to limit the amount of decimal.

    Thank you!


     
    pdorais75, Apr 29, 2008 IP
  2. xrvel

    xrvel Notable Member

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    #2
    Maybe this helps :)

    
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Untitled Document</title>
<script type="text/javascript">
function round2(num) {
    var roundnum = 2;// up to 2 decimal numbers
    var rstr = '';
    var decstr = '';
    var numstr = num + '';
    var iod = numstr.indexOf('.');
    var i = 0;
    var tail = '';
    if (iod > 0) {// with decimal
        rstr = numstr.substring(0, iod);
        decstr = numstr.substring(iod + 1, numstr.length);
        while (tail.length < roundnum) {
            if (decstr.charAt(i)) {
                tail += decstr.charAt(i);
            } else {
                tail += "0";
            }
            i++;
        }
        decstr = tail;
    } else {// no decimal
        rstr = numstr;
        while (decstr.length < roundnum) {
            decstr += "0";
        }
    }
    return(rstr + "." + decstr);
}
</script>
</head>
<body>
<input type="button" value="Check" onclick="alert(round2(3.213))" />
</body>
</html>
    HTML:
     
    xrvel, Apr 30, 2008 IP
  3. pdorais75

    pdorais75 Peon

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    #3
    I don't understand how to incorporate the round calculation in my original script for have a result with only 2 decimal.

    Can you copy past my script and add the line for make it work?
     
    pdorais75, Apr 30, 2008 IP
  4. roshanbh

    roshanbh Peon

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    #4
    var number=2489.8237;
    alert(profits.toFixed(2)); outputs 2489.82

    hope this helps
     
    roshanbh, May 1, 2008 IP
    xrvel likes this.
  5. xrvel

    xrvel Notable Member

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    #5
    Nice, i didn't know about that :) Repped :)
     
    xrvel, May 1, 2008 IP
  6. pdorais75

    pdorais75 Peon

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    #6
    Sorry:confused:, no, i'm not a pro in javascript. I just start understanding this JS :eek:....Where i exactly paste the code in my html page for make it work???

    I put here the complete code of the html page, show m where to copy the lines.

    Thanks for help.

    <html>
<head> 

<script language="javascript">
function calc (form) {
form.liter.value =
form.length.value * 
form.width.value *
form.height.value *0.016387064069264;
form.gallon.value =
form.liter.value /100 *26.4172; 
} 
</script> 

</head>
<body> 
<form> 

length: <input type="text" class="but" name="length" size="2" maxlength="3"><br>
width: <input type="text" class="but" name="width" size="2" maxlength="3"><br>
height: <input type="text" class="but" name="height" size="2" maxlength="3"><br><br>

<input type="button" class="bouton" value="GO" onclick="calc(this.form)"> 

<br><br>
Liters: <input type="text" SIZE="8" value="" name="liter"><br>
Gallon: <input type="text" SIZE="8" value="" name="gallon"><br>


</form> 
</body>
</html>
    Code (markup):
     
    pdorais75, May 2, 2008 IP
  7. Dondon2d

    Dondon2d Peon

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    #7
    Which one are you going to round-off?
     
    Dondon2d, May 2, 2008 IP
  8. pdorais75

    pdorais75 Peon

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    #8
    If possible, i like to round off the 2 answers, i like to see only 2 digit in the decimal answer.
     
    pdorais75, May 3, 2008 IP
  9. vpguy

    vpguy Guest

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    #9
    Change this:

    <script language="javascript">
function calc (form) {
form.liter.value =
form.length.value * 
form.width.value *
form.height.value *0.016387064069264;
form.gallon.value =
form.liter.value /100 *26.4172; 
} 
</script>
    Code (markup):
    To this:

    <script language="javascript">
function calc (form)
{
    var Liters          = form.length.value * form.width.value * form.height.value * 0.016387064069264;
    var Gallons         = Liters * 0.264172;
    form.liter.value    = Liters.toFixed(2);
    form.gallon.value   = Gallons.toFixed(2);
}
</script>
    Code (markup):
     
    vpguy, May 3, 2008 IP
  10. pdorais75

    pdorais75 Peon

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    #10
    Wow, now it's work perfectly:):)....Thak you.

    I will be ble to study the chage now.

    thank again.:D
     
    pdorais75, May 3, 2008 IP