JavaScript - Rounding Up To Whole Number In Calculator

Code:

function convertee(){
    value = document.inputFormee.argument.value;
    if (isNaN(value)){
        alert(value+' is not a valid entry'); return;
    }
    arg = (value/1.75975326);
    arg = (parseInt(arg*100)/100).toFixed(3);
    document.inputFormee.result.value = arg;
}

Any help much appreciated.

Saz.

Code:

num = 1.025;
alert(num.toFixed(2)); // - comes out as 1.02
num = 0.025;
alert(num.toFixed(2)); // comes out as 0.03;

Why is this?

I have tried many ways to do this and have also searched the forum, no go. I was doing it manually doing this:

Code:

Math.round((#)*100)/100

But no go, so I found this function here on the forum:

Code:

function roundNumber(num, dec) {
	var result = Math.round(num*Math.pow(10,dec))/Math.pow(10,dec);
	return result;
}

No go, it works yes, don't get me wrong. But I am working on a invoicing system and it needs to be exact. For instance with this number:

Quote:
0.27470000001
It returns 0.27, when in reality it should return 0.28 because of the 7 changes the 4 to 5 and then 5 changes the 7 to 8. But it doesn't work.

While reading some things I found while searching google I see that Math.round doesn't work 100% the way it should mathematically.

So what options do I have left, I can't believe that a simple rounding calculationg that excel can do ha ha JS cannot.

Hi there,

To summarize my problem:
For example:
Sales : $ 5 (id=sales)
Discount: 11% (id=disc)
Total Discount: $ 0.55 (id=disc)
Rounded Discount: $ 0.6 (1 decimal) (id=rounded)
Net Sales: $ 4.40 (id=net_sales)

document.getElementById("net_sales").value = sales - rounded.toFixed(1);

Net Sales: $
<input id = "net_sales" type="Text" name="net_sales" size="4" value="<?php if (!empty($net_sales)) echo $net_sales; ?>">


I tried the above, it is working in the browser. However, it cannot be written into MYSQL (with PHP). What is wrong with my Javascript?

Thanks.

Hi..

I have javascript code with computation, but I have problem in my result because it was not round off or fixed into two decimal places only.

here is my code:

Code:

<script type="text/javascript">

function test_(cmpd) {
    var len_ = (document.frmMain.elements.length) - 1;
  
     for (i=0; i <= len_; i++ ) {   
    
       var strPos_ = document.frmMain.elements[i].id.indexOf(cmpd)
         
   
              if (strPos_ != -1) {
              var strPos = document.frmMain.elements[i].id.indexOf("_");
              
var strId = document.frmMain.elements[i].id.slice(strPos + 1) + "_" + document.frmMain.elements[i].id.slice(0,strPos)               
     // this is the computation that I need to fixed the result into two decimal places
    document.frmMain.elements[i].value = document.getElementById(strId).value * document.getElementById('mult').value;  
     } 
    }  
}
</script>

Thank you so much

Wizards - I have a challenge!

I am writing a timecard app. The stipulatioin is all Hours fields can only be whole hours or half hour increments. For example, 1.0 is good, 1.5 is good, 1.2 is bad, 1.9 is bad.

I would like to have the field automatically change a value of 1.9 to a value of 2.0 (perhaps onKeyUp).

I would like to have the field automatically change a value of 3.2 to a value of 3.0.

In a nutshell - only allow whole and half hour values. Otherwise round up OR round down.

Thanks for any help you can provide. I am successfully using the Pengoworks plugin for calculations - absolutely priceless. If you think modifications can be made to it, plz let me know.

I have a function below where every time a question is submitted, it will add a new row in the table with a textbox which allows numbers entry only. My question is that I don't know how to code these features in this function:

1: I want the text box to be between 0 and 100, so if text box contains a number which is above 100, it will automatically change the number to the maximum number which is 100.

Does any one know how to code this in my function below in javascript:

Code:

function insertQuestion(form) 
    {   
    
         var row = document.createElement("tr");
         var cell, input;
    
    cell = document.createElement("td");
         cell.className = "weight";
         input = document.createElement("input");
         input.name = "weight_" + qnum;
         input.onkeypress = "return isNumberKey(event)";
         cell.appendChild(input);
         row.appendChild(cell);
    }

When I used toFixed() method on a number, I thought that this method round a number to a specified approximation, but I got a surprising result, the number became string!
15.23689 .toFixed ( 2 ) ==> "15.24"
So does it convert the number into string?

I am trying to figure out how to make a random number I can plug into a script count down from that number at certain times of the day until it reaches 0. I would like it to reset itself at midnight every day. I'm trying to make it work with a script I found on here that resets itself at midnight every day. So instead of it counting down too fast, it would count down to the next number after a randomly generated number of minutes until it reaches 0. But it wouldn't necessarily have to end at 0 at midnight. It could go from 845 to 323 at the end of the day at a slower pace. Is that possible?

I'm using the following code to calculate an age from the given date of birth however it works for some DOB's, gives wrong answers for some and undefined for others, can someone help me?

Code:

 
<div style="font-size:13px; font-family:Verdana;">
<script>
 <!--
/*Darren McGrady */
 var current= new Date()
 var day  = current.getDate()
 var month = current.getMonth() + 1
 var year = current.getFullYear()
 var a = 29
 var b = 12
 var c = 1980
 var age

if (month < b)
      age = (year-c)-1

if ((month == b) && (day < a))
      age = (year-c)-1
else
      age = year-c

document.write(age);

//-->
 </script>
</div>

Below is the code for a calculator using script.
can one help me to explain me the colored line??

<!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>
</head>

<body>
</body>
<script language="javascript" type="text/javascript">
function multiply()
{
a=Number Quote:
Quote:
(document.calculator.number1.value)

;
b=Number(document.calculator.number2.value);
c=a*b;
document.calculator.total.value=c;
}
function addition(){
a=Number(document.calculator.number1.value);
b=Number(document.calculator.number2.value);
c=a+b;
document.calculator.total.value=c;
}
function subtraction(){
a=Number(document.calculator.number1.value);
b=Number(document.calculator.number2.value);
c=a-b;
document.calculator.total.value=c;
}
function division(){
a=Number(document.calculator.number1.value);
b=Number(document.calculator.number2.value);
c=a/b;
document.calculator.total.value=c;
}
function modulus(){
a=Number(document.calculator.number1.value);
b=Number(document.calculator.number2.value);
c=a%b;
document.calculator.total.value=c;
}
</script>

</head>

<body>

<form name="calculator">
Number 1: <input type="text" name="number1">
Number 2: <input type="text" name="number2">
Get Result: <input type="text" name="total">
<input type="button" value="ADD" onclick="javascript:addition();">
<input type="button" value="SUB" onclick="javascript:subtraction();">
<input type="button" value="MUL" onclick="javascript:multiply();">
<input type="button" value="DIV" onclick="javascript:division();">
<input type="button" value="MOD" onclick="javascript:modulus();">

</form>

</body>
</html>

Hi all. I'm having a bit of a problem returning a different value each time a different button is pressed for calculator.

What am I doing wrong?

Code:

<script>
function calc(btname){
for(var x=0;x<=11;x++){
if(x==0){
btname="zero";
}else if(x==1){
btname="one";
}else if(x==2){
btname="two";
}else if(x==3){
btname="three";
}else if(x==4){
btname="four";
}else if(x==5){
btname="five";
}else if(x==6){
btname="six";
}else if(x==7){
btname="seven";
}else if(x==8){
btname="eight";
}else if(x==9){
btname="nine";
}else if(x==10){
btname="multiply";
}else if(x==11){
btname="divide";
}
if('document.forms.test.'+btname+'.onClick'){
alert(btname);
}
}
}

function scalc(){
var sign="";
var btname="";
document.write('<form name="test">');
for(var x=0;x<=11;x++){
if(x==0){
btname="zero";
}else if(x==1){
btname="one";
}else if(x==2){
btname="two";
}else if(x==3){
btname="three";
}else if(x==4){
btname="four";
}else if(x==5){
btname="five";
}else if(x==6){
btname="six";
}else if(x==7){
btname="seven";
}else if(x==8){
btname="eight";
}else if(x==9){
btname="nine";
}else if(x==10){
btname="multiply";
sign = "*";
}else if(x==11){
btname="divide";
sign = "/";
}
if(x<10){
document.write('<input type="button" size="30" name="'+btname+'" value="'+x+'" onClick="calc(this);">&nbsp;');
}else if(x>9 && x<12){
document.write('<input type="button" size="30" name="'+btname+'" value="'+sign+'" onClick="calc(this);">&nbsp;');
}
if(x==2 || x == 5 || x == 8){
document.write('<br>');
}
}
document.write('</form>');
}
scalc();
</script>

ANY help is GREATLY appreciated!

How could i make a calculator that changes three values when a vertex on an image moves. Example : When a point moves on the triangle it changes the cost quality and time.
I have this start and need the meat for the concept to work.<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Untitled Document</title>
</head>

<body>
<p><img src="Assets/Project-triangle.svg.png" width="500" height="492" alt=""/>-------------------------------------------<img src="Assets/triangle.gif" width="224" height="210" alt=""/></p>
<p>
<label for="textfield">Cost :</label>
<input type="text" name="textfield" id="textfield">
<label for="textfield2"> Time :</label>
<input type="text" name="textfield2" id="textfield2">
<label for="textfield3">Quality :</label>
<input type="text" name="textfield3" id="textfield3">
</p>
<p>&nbsp;</p>
</body>
</html>



Help would be greatly appreciated!

Hi ,
this is my bmi calculator script

<HEAD>

<script type="text/javascript">

<!-- Begin script of spillo3000



function calculateBMI() {
var weight = eval(document.form.weight.value)
var height = eval(document.form.height.value)
var height2 = height / 100
var BMI = weight / (height2 * height2)

if(weight == "" || isNaN(weight) || height2 == "" || isNaN(height2))
{
alert("inserisci un valore");
return;
}
else
{

document.form.BodyMassIndex.value=custRound(BMI,1);

if(BMI < 18.5)
{

document.getElementById('feedback').innerHTML = 'Underweight ';
}else if(BMI >=18.5 && BMI < 29.9)
{

document.getElementById('feedback').innerHTML = 'Normal ';
}else if(BMI > 29.9)
{

document.getElementById('feedback').innerHTML = 'Overweight ';
}



}

}

function custRound(x,places) {


return (Math.round(x*Math.pow(10,places)))/Math.pow(10,places)

}

function resetAll(){
document.getElementById('feedback').innerHTML="";
return true;
}


// End -->
</script>
</HEAD>

<!-- -->

<BODY>

<div align="left">
<form name="form" id="form">
<input type="Text" name="weight" size="4"> Peso (Kg)<br>
<input type="Text" name="height" size="4"> Altezza (Cm)<br>
<input type="Text" name="BodyMassIndex" id="BodyMassIndex" size="4"> BMI<br>
<input type="Text" name="feedback" id="feedback" style="padding:10px 0 20px 0; border:none; font-weight:600; color:#555555; font-family:verdana;" ><br>
<input type="button" style="font-size: 8pt" value="Calcola" onClick="calculateBMI()" name="button">
<input type="reset" style="font-size: 8pt" value="Reset" onclick="resetAll()" name="button">
</form>
</div>



<!-- Script Size:

I would want to show writing that it says if is in overweight, norms or I underweigh, but the script does not work. could someone help me? please

Hello guys,
long story short my boss wants me to add this calculator form to our website(here is the link to what he wants exactly) so I try to copy that code but it won't work. I was wondering if this javascript would work.

Code:
Code:

<script language="JavaScript">
function calc() {
gear = document.name1.drpPumpType.1;
vane = document.name1.drpPumpType.2;

if (gear)
{

txtW = document.form1.txtW.value;
txtD = document.form1.txtD.value;
txtL = document.form1.txtL.value;
int gearCIR;
gearCIR = 6 * txtW *(2 * txtD - txtL) * (txtL - txtD) / 2;
}
else
{
int vaneCIR;
vaneCIR = 12 * txtW * (txtL + txtD) / 4 * (txtL - txtD) / 2;
}

I probably don't even need a if statement but I haven't program in a long time and never use java script before. so bare with me.

here is the html form code
Code:
Code:

<form name="name1">
<table align="center" border="0" width="44%">
<tbody>
<tr>
<td colspan="3"><span class="BoldHeadingLabel style1">Displacement&nbsp;from&nbsp;Measurements</span></td></tr>
<tr>
<td width="50"><span class="style1"></span><br />
</td>
<td width="157"><span class="BoldLabel style1">Pump/Motor&nbsp;Type:</span></td>
<td width="456"> <span class="style1"></span> <br />
</td></tr>
<tr>
<td width="50"><span class="style1"></span><br />
</td>
<td width="157"><span class="BoldLabel style1">Gear&nbsp;Width&nbsp;(W):</span></td>
<td><span class="style1"><input name="txtW" id="txtW" maxlength="10" size="10" value="" type="text" /></span></td></tr>
<tr>
<td width="50"><span class="style1"></span><br />
</td>
<td width="157"><span class="BoldLabel style1">Gear&nbsp;Bore&nbsp;Dia.&nbsp;(D):</span></td>
<td><span class="style1"><input name="txtD" id="txtD" maxlength="10" size="10" value="" type="text" /></span></td></tr>
<tr>
<td width="50"><span class="style1"></span><br />
</td>
<td width="157"><span class="BoldLabel style1">Bore&nbsp;to&nbsp;Bore&nbsp;(L):</span></td>
<td><span class="style1"><input name="txtL" id="txtL" maxlength="10" size="10" value="" type="text" /></span></td></tr>
<tr>
<td colspan="3"><span class="style1"></span><br />
</td></tr>
<tr>
<td width="50"><span class="style1"></span><br />
</td>
<td width="157"><span class="BoldLabel style1">Displacement&nbsp;(CIR)&nbsp;&nbsp;&nbsp;=&nbsp;&nbsp;&nbsp;</span></td>
<td><span class="CalAnswer style1">_________</span><span class="style1"><br />
</span></td></tr>
<tr></tr>
<tr>
<td colspan="3"><span class="style1"></span><br />
</td></tr>
<tr>
<td colspan="3" align="center"><input value="Calculate" id="submit1" name="submit1" type="submit" />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<input value="Clear" id="clearform" name="clearform" onclick="cmdReset_onclick()" type="button" /> </td></tr></tbody></table></form>

For some reason it says access denied. I copy this code from that website. but can't find any code wrong.
I know this code is probably so wrong but any help is much appreciated .