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get sum of two variables using javascript not working


candid

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hi,

I'm new to php. I tried to get sum of two variables using java script. Value of one variable come from a php variable, Other one is a static value. here is the code

$price_per_day=100; it displays correctly. but when i try to add it with another variable it displays nothing. Please help me.

 

 

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>test</title>
    <script>
var total = 0;
var total_extra =<?php echo $price_per_day; ?>
var sum1=0;
 
function test(item){
if(item.checked){
total+= parseInt(item.value);
}else{
total-= parseInt(item.value);
}
//alert(total);
sum1=parseInt(total)+parseInt(total_extra);
document.getElementById('Totalcost').innerHTML = total + " /-";
document.getElementById('car_extra_total').innerHTML=sum1 ;
}
</script>
</head>
<body>
  <div class="checkbox">
<label>
 <input type="checkbox" name="channelcost" value="10" onClick="test(this);">Excess Protection<span class="right grey">10</span>
</label>
</div>
<div class="checkbox">
<label>
 <input type="checkbox" name="channelcost" value="50" onClick="test(this);">Additional Driver<span class="right grey">50</span>
</label>
</div>
<div class="checkbox">
<label>
 <input type="checkbox" name="channelcost" value="30"onClick="test(this);">GPS<span class="right grey">30</span>
</label>
</div>
<div class="checkbox">
<label>
 <input type="checkbox" name="channelcost" value="30" onClick="test(this);">Child Booster Seat  <span class="right grey">30</span>
</label>
</div>
<div class="checkbox">
<label>
 <input type="checkbox" name="channelcost" value="20" onClick="test(this);">Child Seat <span class="right grey">20</span>
</label>
</div>
<div class="checkbox">
<label>
 <input type="checkbox" name="channelcost" value="10" onClick="test(this);">Baby Seat <span class="right grey">10</span>
</label>
</div>
  
  <div class="padding20">
<table class="wh100percent size12 bold dark">
 
<tr>
<td>Extras total</td>
<td class="textright">$<span id="Totalcost"> </span></td>
</tr>
</table>
<div class="fdash mt10"></div><br/>
<span class="size14 dark bold">Total price:</span>
<span class="size24 green bold right margtop-5">$<span id="car_extra_total"></span></span>
</div>
 
</body>
</html>
 

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