I Want to add to get total but rather script append as string ?

[leonidassavvides]

var subprice, rather added to total in appended ...well ?
eg subprice=5 total=9 addition>59 rather 14

also the third script code below is it correct ?

<script type="text/javascript">  
/* <![CDATA[*/
function setCookie(c_name,value)
{
	document.cookie=c_name+ "=" +escape(value);
}		
function getCookie(c_name)
{
if (document.cookie.length>0)
  {
  c_start=document.cookie.indexOf(c_name + "=");
  if (c_start!=-1)
    { 
    c_start=c_start + c_name.length+1; 
    c_end=document.cookie.indexOf(";",c_start);
    if (c_end==-1) c_end=document.cookie.length;
    return unescape(document.cookie.substring(c_start,c_end));
    } 
  }
return "";
}
// below same for others   +  (march01.valueOf()==(pickup*1000))
if (getCookie('gps')!=null && getCookie('gps')!='') {
	document.getElementById('gps').checked = getCookie('gps');
}
function calc() {		

	var group = document.extras.group.value;
	var pickup = document.extras.pickup.value;
	var march01 = new Date(2009,2,1);
	var days_hd = document.extras.days_hd.value;
	var subprice = document.extras.price.value;
	var total = 0 ;	// total = subprice ;

	if (document.extras.drivers.value >= 1) { 
		total = total + (document.extras.drivers.value - 1)*days_hd*2;
	}
	if ((document.extras.cseat.value+document.extras.cbseat.value) >= 1) { 
		total += (document.extras.cseat.value+document.extras.cbseat.value-1)*days_hd*2;
	}
	if (document.extras.gps.checked == true) { 
		if (group=="E1") {
			total += 0;
		} else if (march01.valueOf()==(pickup*1000)) {  // go to change this
			total += 0;
		} else {
			total += 1*(days_hd/7)*10;
		}
		document.getElementById('gps1').value = "YES";
	} else {
		document.getElementById('gps1').value = "NO";
	}
	total += subprice;  //
	document.getElementById('t').innerHTML = "€" + total ;
	setCookie('drivers',document.extras.drivers.value);
	setCookie('cseat',document.extras.cseat.value);
	setCookie('cbseat',document.extras.cbseat.value);
	setCookie('gps',document.extras.gps.checked);
	setCookie('transmissionchoosen',document.extras.transmissionchoosen.value);
	document.getElementById('drivers1').value = document.getElementById('drivers').value;
	document.getElementById('cseat1').value = document.getElementById('cseat').value;
	document.getElementById('cbseat1').value = document.getElementById('cbseat').value;
	// getCookie('gps')==true)?checked:unchecked;
	// document.getElementById('gps1').value = document.getElementById('gps').value;
	document.getElementById('transmissionchoosen1').value = document.getElementById('transmissionchoosen').value;
	document.getElementById('finalprice').value = total;
	//  "(getCookie('gps')==true)?document.write('checked'):document.write('');"

} 

/* ]]>*/
</script>

<table width="450" border="1" align="center" cellpadding="2" cellspacing="2" summary="Extras cost">
              <caption>
              EXTRAS
              </caption>
            <tr>
              <td width="270" align="left" valign="middle">Extra drivers-1st FREE OF CHARGE (€2/day)</td>
              <td width="160" align="left" valign="middle"><select name="drivers" id="drivers" onchange="calc();">
                <option value="(getCookie('drivers')!=null && getCookie('drivers')!='') ? getCookie('drivers'):0;" selected="selected"><script type="text/javascript">(getCookie('drivers')!=null && getCookie('drivers')!='')?document.write(getCookie('drivers')):document.write("0");</script></option>
                <option value="0">0</option>
                <option value="1">1</option>
                <option value="2">2</option>
                <option value="3">3</option>
                <option value="4">4</option>
              </select></td>
            </tr>
            <tr>
              <td align="left" valign="middle">Small Seat-1st FREE OF CHARGE</td>
              <td align="left" valign="middle">&nbsp;</td>
            </tr>
            <tr align="right" valign="middle">
              <td align="left" valign="middle">Child Car Seat (€2/day)</td>
              <td align="left" valign="middle"><select name="cseat" id="cseat" onchange="calc();" >
                <option value="(getCookie('cseat')!=null && getCookie('cseat')!='') ? getCookie('cseat'):0;" selected="selected"><script type="text/javascript">(getCookie('cseat')!=null && getCookie('cseat')!='')?document.write(getCookie('cseat')):document.write("0");</script></option>              
                <option value="0">0</option>
                <option value="1">1</option>
                <option value="2">2</option>
                <option value="3">3</option>
              </select></td>
            </tr>
            <tr>
              <td align="left" valign="middle">Child Booster Seat (€2/day)</td>
              <td align="left" valign="middle"><label>
                <select name="cbseat" id="cbseat" onchange="calc();" >
                <option value="(getCookie('cbseat')!=null && getCookie('cbseat')!='') ? getCookie('cbseat'):0;" selected="selected"><script type="text/javascript">(getCookie('cbseat')!=null && getCookie('cbseat')!='')?document.write(getCookie('cbseat')):document.write("0");</script></option>
                  <option value="0">0</option>
                  <option value="1">1</option>
                  <option value="2">2</option>
                  <option value="3">3</option>
                </select>
              </label></td>
            </tr>
            <tr>
              <td align="left" valign="middle">GPS (€10/week or FREE if special offer)</td>
              <td align="left" valign="middle"><label>
              <input name="gps" type="checkbox" id="gps" onclick="calc();" value="YES" />
</label></td>
            </tr>
            <tr>
              <td align="left" valign="middle">Choose Transmission</td>
              <td align="left" valign="middle"><label>
                <select name="transmissionchoosen" id="transmissionchoosen">
                <option value="(getCookie('transmissionchoosen')!=null && getCookie('transmissionchoosen')!='') ? document.write(getCookie('transmissionchoosen')):document.write('Automatic');" selected="selected"><script type="text/javascript">(getCookie('transmissionchoosen')!=null && getCookie('transmissionchoosen')!='')?document.write(getCookie('transmissionchoosen')):document.write("Automatic");</script></option>                
                  <option value="Automatic">Automatic</option>
                  <option value="Manual">Manual</option>
                  <option value="Whatever">Whatever</option>
                </select>
              </label></td>
            </tr>
            <tr>
              <td>&nbsp;</td>
              <td>&nbsp;</td>
            </tr>
            <tr>
              <td align="right" valign="middle">TOTAL[Incl. extras]:</td>
              <td bgcolor="#CCCCCC" id="t">&nbsp;</td>
            </tr>
          </table>

------------------------------------------------

<select name="transmissionchoosen" id="transmissionchoosen">
                <option value="(getCookie('transmissionchoosen')!=null && getCookie('transmissionchoosen')!='') ? document.write(getCookie('transmissionchoosen')):document.write('Automatic');" selected="selected"><script type="text/javascript">(getCookie('transmissionchoosen')!=null && getCookie('transmissionchoosen')!='')?document.write(getCookie('transmissionchoosen')):document.write("Automatic");</script></option>                
                  <option value="Automatic">Automatic</option>
                  <option value="Manual">Manual</option>
                  <option value="Whatever">Whatever</option>
                </select>

[jscheuer1]

The value of a form element is a string, not a number, so will be appended rather than added mathematically when the plus operator is used.

However, a string which represents a number may be converted to a number before addition is attempted. This may be done by giving it the (what I believe is called) unary plus sign, but that gets confusing when also using + as an operator, as they are the same character. An alternative is to subtract 0 from it.

There are ony two sections in the code where it looks like this needs to be done:

	if ((document.extras.cseat.value+document.extras.cbseat.value) >= 1) { 
		total += (document.extras.cseat.value+document.extras.cbseat.value-1)*days_hd*2;

which should be:

	if (((document.extras.cseat.value-0)+(document.extras.cbseat.value-0)) >= 1) { 
		total += ((document.extras.cseat.value-0)+(document.extras.cbseat.value-1))*days_hd*2;

and:

	total += subprice;  //

which should be:

	total += (subprice-0);  //

[leonidassavvides]

I may use and parseInt() or parseFloat() ?

I want if onload[refresh page or submit to same page] to call function calc(); to calculate form fields...also to populate second form hidden fields , where to include ... window.onload=fromCookiesToSecondFormFields(); ?

The window.onload=calc(); May exist more than one in differ places ?

Hidden fields must created and after , to call assignment functions ? If yes, assignment functions come after hiddens ?

If we give values to non existed hiddens is error ? If we assign hiddens from js cookies then is better included in their form the assignment code in case there are two forms [their form is second] and second appears only after success submit to same page of first[here we have selection sequence - php] ?

review files
https://www.poliscarhire.com/custome...24jan2009b.php
http://www.poliscarhire.com/js/booki...alc2SLfinal.js underconstruction

[magicgavin]

Also using

-=-

is the same as += but it will be treated as a number rather than a string.