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How do I round off the result? [duplicate]

This question already has answers here:
Gaussian/banker's rounding in JavaScript
(9 answers)
Closed 3 years ago.
<script >
function sum() {
var txtFirstNumberValue = document.getElementById('studentenrolled').value;
var txtSecondNumberValue = document.getElementById('classsize').value;
var result = parseInt(txtFirstNumberValue) / parseInt(txtSecondNumberValue);
if (!isNaN(result)) {
document.getElementById('nooftut').value = result;
}
}
</script>
<tr>
<td><label for="studentenrolled">Student Enrolled</label> </td>
<td> <input type="text" name="studentenrolled" id="studentenrolled" value="<?php echo $row['studentenrolled']; ?> " /></td>
</tr>
<tr>
<td><label for="classsize">Class Size</label> </td>
<td> <input type="text" id="classsize" onkeyup="sum();" /></td>
</tr>
<tr>
<td><label for="nooftut">No Of Tutorial</label> </td>
<td> <input type="text" id="nooftut" disabled="disabled" /></td>
</tr>
How to I round up or down the results in "nooftut"
Calculation : studentenrolled / class size = nooftut
As studentenrolled is pulled from the db, I'm not able to round up or down

Try Math.round()
function sum() {
var txtFirstNumberValue = document.getElementById('studentenrolled').value;
var txtSecondNumberValue = document.getElementById('classsize').value;
var result = parseInt(txtFirstNumberValue) / parseInt(txtSecondNumberValue);
if (!isNaN(result)) {
document.getElementById('nooftut').value = Math.round(result);
}
}
<tr>
<td><label for="studentenrolled">Student Enrolled</label> </td>
<td> <input type="text" name="studentenrolled" id="studentenrolled" value=" " /></td>
</tr>
<tr>
<td><label for="classsize">Class Size</label> </td>
<td> <input type="text" id="classsize" onkeyup="sum();" /></td>
</tr>
<tr>
<td><label for="nooftut">No Of Tutorial</label> </td>
<td> <input type="text" id="nooftut" disabled="disabled" /></td>
</tr>

+1.5 => +1.0 using Math.floor() (To round down)
-1.5 => -1.0 using Math.ceil() (To round up)
or just Math.round(0.9) => 1

Using the same jQuery in multiple operations

I have a small question and I hope someone can help me with it :D
I’m trying to create a product table, in which a user just add the quantity of a product and the jquery makes the multiplication to its value and gives the result
I already made this, and it works well:
<script>
$(document).ready(function(){
$('#quantity_1').keyup(function(){
var price_1 = $("#price_1").val();
var quantity_1 = $("#quantity_1").val();
quantity_1 = quantity_1.replace(/[^0-9]+/g, '');
$("#quantity_1").val(quantity_1);
var total_1 = price_1 * quantity_1;
$( "#total_1" ).val( total_1.toFixed(2) );
});
});
</script>
<table border="1" cellpadding="5px" cellspacing="0" >
<tr>
<td>Product</td>
<td>Price</td>
<td>Quantity</td>
<td>Total</td>
</tr>
<tr>
<td>Product Name</td>
<td><input type="hidden" name="product[1][price]" id="price_1" value="10.00" />10.00</td>
<td><input type="text" name="product[1][quantity]" id="quantity_1" /></td>
<td><input type="text" name="product[1][total]" id="total_1" value="0" /></td>
</tr>
</table>
Working demo here:
http://jsfiddle.net/EnterateNorte/9kswL0gf/
But I would like to be able to add more than one line, like so:
<table border="1" cellpadding="5px" cellspacing="0" >
<tr>
<td>Product</td>
<td>Price</td>
<td>Quantity</td>
<td>Total</td>
</tr>
<tr>
<td>Name 1</td>
<td><input type="hidden" name="product[1][price]" id="price_1" value="10.00" />10.00</td>
<td><input type="text" name="product[1][quantity]" id="quantity_1" /></td>
<td><input type="text" name="product[1][total]" id="total_1" value="0" /></td>
</tr>
<tr>
<td>Name 5</td>
<td><input type="hidden" name="product[5][price]" id="price_5" value="10.00" />23.00</td>
<td><input type="text" name="product[5][quantity]" id="quantity_5" /></td>
<td><input type="text" name="product[5][total]" id="total_5" value="0" /></td>
</tr>
<tr>
<td>Name 3</td>
<td><input type="hidden" name="product[3][price]" id="price_3" value="130.00" />10.00</td>
<td><input type="text" name="product[3][quantity]" id="quantity_3" /></td>
<td><input type="text" name="product[3][total]" id="total_3" value="0" /></td>
</tr>
<tr>
<td>Name 4</td>
<td><input type="hidden" name="product[4][price]" id="price_4" value="12.00" />10.00</td>
<td><input type="text" name="product[4][quantity]" id="quantity_4" /></td>
<td><input type="text" name="product[4][total]" id="total_4" value="0" /></td>
</tr>
</table>
And if it isn’t to much trouble, I would be awesome if it would SUM all the totals and show a gran total at the end of the table :)

Use:
$(document).ready(function(){
$('[name*=quantity]').keyup(function(){
var price = $(this).parent().prev().find('input').val();
var quantity = $(this).val();
var total = price * quantity;
$(this).parent().next().find('input').val( total.toFixed(2) );
});});
Working Demo
Update: For showing Grand Total
var sum = 0;
//iterate through each textboxes and add the values
$('[name*=total]').each(function() {
//add only if the value is number
if(!isNaN(this.value) && this.value.length!=0) {
sum += parseInt(this.value);
}
});
Working Demo

What you can do is to find the elements using their relative position instead of hard coded ids
$(document).ready(function () {
$('input[id^="quantity_"]').keyup(function () {
var $tr = $(this).closest('tr');
var price = $tr.find('input[id^="price_"]').val();
var quantity = this.value;
var total = (price * quantity) || 0;
$tr.find('input[id^="total_"]').val(total.toFixed(2));
});
});
Demo: Fiddle

I've updated your code in Fiddle. You need to change in your markup a bit.
<tr>
<td>Product Name</td>
<td><input type="hidden" class="price" ... />10</td>
<td><input type="text" class="quantity" ... /></td>
<td><input type="text" class="total" ... /></td>
</tr>
$(document).ready(function(){
$('.quantity').keyup(function(){
var parent = $(this).closest("tr");
var price = $(".price", parent).val();
var quantity = $(".quantity", parent).val();
var total = price * quantity;
$(".total", parent).val(total.toFixed(2));
});
});

I would recommend you to use common class
HTML:
<tr>
<td>Name 5</td>
<td>
<input type="hidden" class="price" value="10.00" />10.00</td>
<td>
<input type="text" class="quantity" />
</td>
<td>
<input type="text" class="total" value="0" />
</td>
</tr>
<tr>
<td>Name 3</td>
<td>
<input type="hidden" class="price" value="130.00" />130.00</td>
<td>
<input type="text" class="quantity" />
</td>
<td>
<input type="text" class="total" value="0" />
</td>
</tr>
Script:
$('.quantity').keyup(function () {
var tr = $(this).closest('tr');
var price = tr.find('.price').val();
var quantity = $(this).val();
var total = price * quantity;
tr.find('.total').val(total.toFixed(2));
});
DEMO

Modify your table:
<table border="1" cellpadding="5px" cellspacing="0" id='table' >
<!-- your rows with inputs -->
<tr>
<td>
<input id='totalSum' value='0' type='text' />
</td>
</tr>
</table>
Make all your 'total' inputs readonly by adding 'readonly' attribute.
js code:
$(document).ready(function(){
$('[name*=quantity]').keyup(function(){
var total = 0;
$('#table tr').each(function(i,item){
var price = parseFloat($(item).find('[name*=price]').val().replace(',','.'));
var quantity = parseInt($(item).find('[name*=quantity]').val());
if(!isNaN(price) && !isNan(quantity)){
total += price*quantity;
}
});
$("#totalSum").val(total.toFixed(2));
});
});

How to reflect a calculation from one field to another

I'm very new to JavaScript and I have an assignment that I'm unable to resolve. So I have a table with five fields and I need to calculate the total for a month, then automatically generate the yearly total in a different cell. I got to make the total work for the month but I have no idea how to reflect that in the year cells. Any help will be much appreciated. Thanks a lot for your time :)
Here's my code:
<head>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script>
<script type="text/javascript">
function update() {
var a = +document.forms['calc'].elements['fieldOne'].value,
b = +document.forms['calc'].elements['fieldTwo'].value,
c = +document.forms['calc'].elements['fieldThree'].value,
d = +document.forms['calc'].elements['fieldFour'].value,
e = +document.forms['calc'].elements['fieldFive'].value,
fieldTotal = ((b-d)*a)*c;
document.forms['calc'].elements['fieldTotal'].value = fieldTotal;
return false;
}
function update2() {
var f = +document.forms['calc'].elements['field6'].value,
g = +document.forms['calc'].elements['field7'].value,
h = +document.forms['calc'].elements['field8'].value,
i = +document.forms['calc'].elements['fieldFour'].value,
j = +document.forms['calc'].elements['fieldFive*12'].value,
field9=fieldFour;
field10=fieldFive*12;
fieldTotal2=fieldTotal*12;
document.write('fieldTotal2');
document.write('field9');
document.write('field10');
return false;
}
</script>
</head>
<body>
<form name="calc" action="#">
<table width="600" border="1">
<tr>
<td colspan="2"> </td>
<td width="63">Month</td>
<td width="109">Year</td>
</tr>
<tr>
<td colspan="2">Field1</td>
<td><input type="text" name="fieldOne" id="fieldOne" size="15" value="5,000" /></td>
<td><input type="text" name="field6" id="field6" size="15" value="60,000"/></td>
</tr>
<tr>
<td colspan="2">Field2</td>
<td><input type="text" name="fieldTwo" id="fieldTwo" value="3.0" size="15" /></td>
<td><input type="text" name="field7" id="field7" value="3.0" size="15" /></td>
</tr>
<tr>
<td colspan="2">Field3</td>
<td><input type="text" name="fieldThree" id="fieldThree" size="15" value="$350"/></td>
<td><input type="text" name="field8" id="field8" size="15" value="$350"/></td>
</tr>
<tr>
<td colspan="2">Field4</td>
<td><input type="text" name="fieldFour" id="fieldFour" value="1.5" size="15" /></td>
<td><input type="number" name="field9" id="field9" value="1.5" size="15" /></td>
</tr>
<tr>
<td colspan="2">Filed5</td>
<td><input type="text" name="fieldFive" id="fieldFive" size="15" value="75"/></td>
<td><input type="text" name="field10" id="field10" size="15" /></td>
</tr>
<tr>
<td width="137">Total</td>
<td width="83"><input type="button" value="Calculate" onClick="update();return false;" /></td>
<td><input type="text" name="fieldTotal" id="fieldTotal" size="15" readonly /></td>
<td><input type="text" name="fieldTotal2" id="fieldTotal2" size="15" readonly /></td>
</tr>
</table>
</form>
</body>

Based on what you described I think this should work for you.
Demo
function update() {
var frmEles = document.forms.calc.elements,
a = frmEles.fieldOne.value.replace(',',''), //Remove comma
b = frmEles.fieldTwo.value,
c = frmEles.fieldThree.value.replace('$',''), //Remove Dollar sign
d = frmEles.fieldFour.value,
e = frmEles.fieldFive.value,
fieldTotal = ((b-d)*a)*c;
//Total for the month
frmEles.fieldTotal.value = formatNumber(fieldTotal);
//Calculations for the year
frmEles.field6.value = formatNumber(a * 12);
frmEles.field7.value = formatNumber(b * 12);
frmEles.field8.value = '$' + formatNumber(c * 12); //Add back dollar sign
frmEles.field9.value = formatNumber(d * 12);
frmEles.field10.value = formatNumber(e * 12);
frmEles.fieldTotal2.value = formatNumber(fieldTotal * 12);
return false;
}
//Format the numbers with commas.
function formatNumber(n){
return n.toLocaleString();
}

JavaScript script not working

I need to write a javascript to make certain calculations by taking data from a form. I have written the script and ensured all the ids and variables are correct. For some reason, my script doesn't seem to run. Can someone please tell me where I'm going wrong??
This is my form action.
<body>
<div class="header">
Financial Calculator
</div>
<script type="text/javascript" src="calc.js"></script>
<div class="calc">
<form name="calc" method="post" onsubmit="calc()">
<table align="center">
<tr>
<th></th>
<th>Lease Data</th>
<th>Purchase Data</th>
<th>Purchase Data with Rebate</th>
</tr>
<tr>
<td>Cost</td>
<td><input type="text" name="cost1" placeholder="Please enter in $"></td>
<td><input type="text" name="cost2" placeholder="Please enter in $"></td>
<td><input type="text" name="cost3" placeholder="Please enter in $"></td>
</tr>
<tr>
<td>Downpayment</td>
<td><input type="text" name="downpayment1" placeholder="Please enter in $"></td>
<td><input type="text" name="downpayment2" placeholder="Please enter in $"></td>
<td><input type="text" name="downpayment3" placeholder="Please enter in $"></td>
</tr>
<tr>
<td>Period</td>
<td><input type="text" name="period1" placeholder="Please enter in months"></td>
<td><input type="text" name="period2" placeholder="Please enter in years"></td>
<td><input type="text" name="period3" placeholder="Please enter in years"></td>
</tr>
<tr>
<td>Rebates/Incentives</td>
<td></td>
<td></td>
<td><input type="text" name="rebate" placeholder="Please enter in $"></td>
</tr>
<tr>
<td>Interest</td>
<td></td>
<td><input type="text" name="interest1" placeholder="Please enter in %"></td>
<td><input type="text" name="interest2" placeholder="Please enter in %"></td>
</tr>
<tr>
<td>Monthly Payment</td>
<td><input type="text" name="monthly_payment1" placeholder="Please enter in $"></td>
<td></td>
<td></td>
</tr>
<tr>
<td>Distance Limit</td>
<td><input type="text" name="distance_limit" placeholder="Please enter in miles"></td>
</tr>
<tr>
<td>Extra Miles</td>
<td><input type="text" name="extra_miles" placeholder="Please enter in miles"></td>
</tr>
<tr>
<td>Cost for extra mile</td>
<td><input type="text" name="cost_extra" placeholder="Please enter in $"></td>
</tr>
<tr>
<td></td>
<td></td>
<td><br><input type="submit" value="Calculate"></td>
</tr>
</table>
<table id="result">
<tr>
<th></th>
<th>Purchase with finance</th>
<th>Purchase with Rebate</th>
<th>Lease</th>
<th>Purchase after Lease</th>
<th>Purchase after lease with additional miles</th>
</tr>
<tr>
<td>Total Monthly Payments</td>
<td id="mp1"><input type="text"></td>
<td id="mp2"><input type="text"></td>
<td id="mp3"><input type="text"></td>
</tr>
<tr>
<td>Ownership Cost</td>
<td id="oc1"><input type="text"></td>
<td id="oc2"><input type="text"></td>
<td id="oc3"><input type="text"></td>
<td id="oc4"><input type="text"></td>
<td id="oc5"><input type="text"></td>
</tr>
<tr>
<td>Per month owned</td>
<td id="pmo1"><input type="text"></td>
<td id="pmo2"><input type="text"></td>
<td id="pmo3"><input type="text"></td>
<td id="pmo4"><input type="text"></td>
<td id="pmo5"><input type="text"></td>
</tr>
<tr>
<td>Residual Value</td>
<td id="res1"><input type="text"></td>
<td id="res2"><input type="text"></td>
</tr>
<tr> <td></td></tr>
<tr><td></td></tr>
<tr> <td></td></tr>
<tr><td></td></tr>
<tr> <td></td></tr>
<tr><td></td></tr>
</table>
</form>
</div>
</body>
My Javascript is:
function calc()
{
var cost1 = (parseFloat)(document.calc.cost1.value);
var downpayment1 = (parseFloat)(document.calc.downpayment1.value);
var mp1 = (parseFloat)(document.calc.monthly_payment1.value);
var period1 = (parseFloat)(document.calc.period1.value);
var extra_miles = (parseFloat)(document.calc.extra_miles.value);
var cost_extra_miles = (parseFloat)(document.calc.cost_extra_miles.value);
var extra_cost = extra_miles * cost_extra_miles;
var res_amt = 0.56 * cost1;
var totmp = mp1 * period1;
var ocost1 = downpayment1 + totmp + extra_cost;
var omonth1 = ocost1 / period1;
var ocost2 = ocost1 + res_amt;
var omonth2 = ocost2 / period1;
var ocost3 = ocost2 - extra_cost;
var omonth3 = ocost3 / period1;
var cost2 = (parseFloat)(document.calc.cost2.value);
var downpayment2 = (parseFloat)(document.calc.downpayment2.value);
var period2 = (parseFloat)(document.calc.period2.value);
var interest1 = (parseFloat)(document.calc.interest1.value);
var finance1 = cost2 - downpayment2;
var mp2 = ((interest1 / 12) * period2) - finance1;
var omonth_woreb = mp2 * period2;
var ocost_woreb = omonth_woreb + downpayment2;
var pmonth_woreb = ocost_woreb / period2;
var resvalue1 = ocost_woreb - res_amt;
var cost3 = (parseFloat)(document.calc.cost3.value);
var downpayment3 = (parseFloat)(document.calc.downpayment3.value);
var period3 = (parseFloat)(document.calc.period3.value);
var interest2 = (parseFloat)(document.calc.interest2.value);
var rebate = (parseFloat)(document.calc.rebate.value);
var finance2 = cost3 - downpayment3 -rebate;
var mp3 = ((interest1 / 12) * period3) - finance2;
var omonth_wreb = mp3 * period3;
var ocost_wreb = omonth_wreb + downpayment3;
var pmonth_wreb = ocost_wreb / period3;
var resvalue2 = ocost_wreb - res_amt;
document.getElementById("mp1").innerHTML = ;
document.getElementById("mp2").innerHTML = ;
document.getElementById("mp3").innerHTML = totmp;
document.getElementById("oc1").innerHTML = ocost_woreb;
document.getElementById("oc2").innerHTML = ocost_wreb;
document.getElementById("oc3").innerHTML = ocost1;
document.getElementById("oc4").innerHTML = ocost2;
document.getElementById("oc5").innerHTML = ocost3;
document.getElementById("pmo1").innerHTML = pmonth_woreb;
document.getElementById("pmo2").innerHTML = pmonth_wreb;
document.getElementById("pmo3").innerHTML = omonth1;
document.getElementById("pmo4").innerHTML = omonth2;
document.getElementById("pmo5").innerHTML = omonth3;
document.getElementById("res1").innerHTML = resvalue1;
document.getElementById("res2").innerHTML = resvalue2;
}

The following lines aren't syntactically valid:
document.getElementById("mp1").innerHTML = ;
document.getElementById("mp2").innerHTML = ;
If you want to empty the contents of an input, you could use value and an empty string:
document.getElementById("mp1").value = '';
document.getElementById("mp2").value = '';

var cost1 = (parseFloat)(document.calc.cost1.value);
You do not wrap parseFloat in parens.
var cost1 = parseFloat(document.calc.cost1.value);
And you are not cancelling the form submission, the page is refereshing. Easy way to cancel the submission is returning false
onsubmit="calc();return false;"
and this is an error
document.getElementById("mp1").innerHTML = ;
document.getElementById("mp2").innerHTML = ;
Look at this:
The id is on the td, not the input. You are not going to get a value in there if that was your plan.

how to prevent isNaN before dates are selected in Datepicker

I would like to prevent NaN from showing up in these text boxes: "total_full", "total_half", "total_single". I have tried setting the initial value of all calculating / number fields to "0", but "total_single" is still NaN until "check_out" date is selected and the total_days_acc is updated?
I am not sure how much of the code I am supposed to put here, and I would hate to leave something important out, so here is a link to a question where i incorrectly posted "all" the coding. :
hide / show fields based on input value
Thank you
<td>Accommodation:</td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr>
<td><p>Check in Date</p></td>
<td><input type="text" name="check_in_date" id="check_in_date" class="datepicker" /></td>
<td><p> </p></td>
<td><p>Check out Date</p></td>
<td><p>
<input type="text" name="check_out_date" id="check_out_date" class="datepicker" />
</p></td>
</tr>
<tr>
<td> </td>
<td> </td>
<td> </td>
<td>Total Days Accommodation</td>
<td><input type="text" name="total_days_acc" id="total_days_acc" /></td>
</tr>
<tr>
<td>Number of Rooms:</td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr>
<td>Single</td>
<td><input type="text" name="no_of_rooms_single" id="no_of_rooms_single" /></td>
<td> </td>
<td>Double / Twin</td>
<td><input type="text" name="no_of_rooms_double" id="no_of_rooms_double" /></td>
</tr>
<tr>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr>
<td>Contact Person</td>
<td><input type="text" name="contact_person" id="contact_person" /></td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr>
<td>Telephone Number</td>
<td><input type="text" name="tel_no" id="tel_no" /></td>
<td> </td>
<td>Fax Number</td>
<td><input type="text" name="fax_no" id="fax_no" /></td>
</tr>
<tr>
<td>Cell Number</td>
<td><input type="text" name="cell_no" id="cell_no" /></td>
<td> </td>
<td>Email</td>
<td><input type="text" name="email" id="email" /></td>
</tr>
<tr>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr>
<td>Full Day Conference # R260.00 p/p</td>
<td><input type="text" name="full_day" id="full_day" /></td>
<td> </td>
<td>Total Cost Full Day</td>
<td><input type="text" name="total_full" id="total_full" readonly="readonly" /></td>
</tr>
<tr>
<td>Half Day Conference # R240.00 p/p</td>
<td><input type="text" name="half_day" id="half_day" /></td>
<td> </td>
<td>Total Cost Half Day</td>
<td><input type="text" name="total_half" id="total_half" readonly="readonly" /></td>
</tr>
<tr>
<td>Single Rooms # R480.00 p/p</td>
<td><input type="text" name="single_rooms" id="single_rooms" /></td>
<td> </td>
<td>Total Cost Single Rooms</td>
<td><input name="total_single" type="text" id="total_single" readonly="readonly" /></td>
</tr>
<tr>
<td>Double / Twin Rooms # R720.00 p/p</td>
<td><input type="text" name="double_rooms" id="double_rooms" /></td>
<td> </td>
<td>Total Cost Double / Twin</td>
<td><input name="total_double" type="text" id="total_double" readonly="readonly" /></td>
</tr>
<tr>
<td>Data Projector # R400.00 rental p/day</td>
<td><input type="text" name="data_proj" id="data_proj" /></td>
<td> </td>
<td>Total Cost Projector Rental</td>
<td><input name="total_project" type="text" id="total_project" readonly="readonly" /></td>
</tr>
<tr>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr>
<td>Sub Total</td>
<td><input type="text" name="sub_total" id="sub_total" /></td>
<td> </td>
<td> </td>
<td> </td>
</tr>
<tr>
<td height="23"> </td>
<td> </td>
<td> </td>
<td> </td>
<td> </td>
</tr>
</form>
</table>
</div>
<div id="hideme">
Hello Hideme
</div>
<p> </p>
<p> </p>
</body>
</html>
<script type="text/javascript">
//Datepicker
$(function() {
$(".datepicker").datepicker({ minDate: -0, maxDate: "+100M +10D",dateFormat: 'dd-mm-yy'})
({
changeMonth: true,
changeYear: true,
});
});
//Datepicker Enquiry Date Set to Today
var enquiry_date = $.datepicker.formatDate('dd-mm-yy', new Date());
document.getElementById('enquiry_date').value = enquiry_date;
//Datepicker Conference in / out
var calcDate = function() {
var start = $('#conference_date_in').datepicker('getDate');
var end = $('#conference_date_out').datepicker('getDate');
var days = (end - start) / 1000 / 60 / 60 / 24 + 1;
if(days==0) {days=1
}
if( days >= 0 ) {
document.getElementById('total_days').value = days;
}
}
$('#conference_date_out').change(calcDate);
$('#conference_date_in').change(calcDate);
//Datepicker Check in / Out Accommodation
var calcDateAcc = function() {
var startacc = $('#check_in_date').datepicker('getDate');
var endacc = $('#check_out_date').datepicker('getDate');
var daysacc = (endacc - startacc) / 1000 / 60 / 60 / 24;
if(daysacc==0) daysacc=1
if( daysacc >= 0 ) {
document.getElementById('total_days_acc').value = daysacc;
}
}
$('#check_in_date').change(calcDateAcc);
$('#check_out_date').change(calcDateAcc);
//Calculate Total Cost FullDay Conference
function calculateFull()
{
var fulldays = parseInt(document.getElementById("full_day").value);
var no_of_delegates = parseInt(document.getElementById("no_of_delegates").value);
var fullprice = 260;
var resultfull = fulldays * no_of_delegates * fullprice;
document.getElementById("total_full").value = resultfull;
}
$('#full_day').change(calculateFull).keyup(calculateFull);
//Calculate Half Day conference total
function calculateHalf()
{
var halfdays = parseInt(document.getElementById("half_day").value);
var no_of_delegates = parseInt(document.getElementById("no_of_delegates").value);
var halfprice = 240;
var resulthalf = halfdays * no_of_delegates * halfprice;
document.getElementById("total_half").value = resulthalf;
}
$('#half_day').change(calculateHalf).keyup(calculateHalf);
//Calculate Total Cost Single Rooms
function calculateSingle()
{
var single_rooms = parseInt(document.getElementById("single_rooms").value);
var total_days_acc = parseInt(document.getElementById("total_days_acc").value);
var single_rooms_price = 480;
var resultsingle = single_rooms * total_days_acc * single_rooms_price;
document.getElementById("total_single").value = resultsingle;
}
$('#single_rooms').change(calculateSingle).keyup(calculateSingle);
$('#check_in_date').change(calculateSingle);
$('#check_out_date').change(calculateSingle);
//Hide me Testing
$("#full_day").keyup(function(){
if ($('#full_day').val() == "1") {
$("#hideme").show("fast"); //Slide Down Effect
}
else {
$("#hideme").hide("fast"); //Slide Up Effect
}
});
</script>

Instead of just inserting the value into the page, just do this:
document.getElementById("total_days").value = isNaN(days) ? 0 : days;