<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" name="viewport" content="width=device-width, initial-scale=1"/> <link rel="stylesheet" type="text/css" href="css/bootstrap.css" /> </head> <body> <nav class="navbar navbar-default"> <div class="container-fluid"> </div> </nav> <div class="col-md-6 well"> <hr style="border-top:1px dotted #ccc;"> <div class="col-md-4"> <div class="form-group"> </div> </div> <div class="col-md-8"> <div class="form-inline"> <div class="form-inline"> <input type="text" id="total" disabled="disabled"/> </div> </div> </div> </div> </body> </html>
var total=0; function UpdateCost(elem) { if (elem.checked == true) { total += Number(elem.value); }else{ total -=Number(elem.value); } document.getElementById('total').value = total.toFixed(0); }