Javascript calculate the sum of all input fields with a specific class

Question

Okay, i have this code which is working fine to a specific point.

    $(document).ready(function(){
          var val1 = +$(".charge").val();
          var val2 = +$(".fee").val();
          var val3 = +$(".loadrate").val();
          $("#finalrate").val(val1-val2+val3);
    $(".financeinput").keyup.each(function(){
          var val1 = +$(".charge").val();
          var val2 = +$(".fee").val();
          var val3 = +$(".loadrate").val();
          var initial = $("#finalrate").val();

          $("#finalrate").val(val1-val2+val3);

          var second = $("#finalrate").val();

          if(initial < second){

          $("#finalrate").removeClass("redardown").addClass("greenarup");

          }
          if(initial > second){

          $("#finalrate").removeClass("greenarup").addClass("redardown");

          }
          if(initial = second){

          }

    });
});

I have multiple fields with class ".charge" and multiple fields with class ".fee" but the code here is getting only the values of the first fields with that class, while i need all of them to be calculated. I know this must be very easy, but i am fairly new to javascript.

specifically you are looking for a jquery solution and not plain vanilla javascript. its a misleading headline... :( — nh-labs, May 08 '19 at 18:59

score 1 · Accepted Answer · edited May 23 '17 at 11:46

You should use .each on your 'charge' and 'fee' inputs.

$(".charge").each(function()
{
    $(this).val(); // this should have value for current input
}

here is a link that shows how to use the each function

Here is an example so you can see how it works:

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<meta http-equiv="cache-control" content="max-age=0" />
<meta http-equiv="cache-control" content="no-cache" />
<meta http-equiv="expires" content="0" />
<meta http-equiv="expires" content="Tue, 01 Jan 1980 1:00:00 GMT" />
<meta http-equiv="pragma" content="no-cache" />
<script src="http://code.jquery.com/jquery-1.7.2.min.js"></script>
<title>Login</title>
</head>
<body>
<input class="test" type="text" value="2">
<input class="test" type="text" value="3">
<input class="test" type="text" value="4">
</body>
<script type="text/javascript">
var test1 = 0;
$(".test").each(function(){
    test1 += parseInt($(this).val());
});
window.alert("" + test1);
</script>
</html>

I'm not sure exactly what you are trying to do but you might want something like this:

var val1 = 0;
$(".charge").each(function(){
     val1 += parseInt($(this).val());
});
window.alert("" + val1); // should have all .charge added up here

Thats what i did `var val1 = $(".charge").each( function(){ $(this).val(); } );` — Radoslav Trenev, Jan 15 '15 at 18:23

score 0 · Answer 2 · answered Jan 15 '15 at 18:07

0

this is just a pseudocode but basically your solution may look like this (pure js)

var x = document.getElementsByClassName("charge");
for(var i = 0; i<x.length; i++){
   sum += x[i].value;
}

and just do that for all the classes you need

answered Jan 15 '15 at 18:07

user2879041

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Your answer is probably correct, but i get NaN. Do you know why? – Radoslav Trenev Jan 15 '15 at 18:28
do you know how to use the developer tools with break points? It's hard to determine without html – user2879041 Jan 15 '15 at 19:14

Javascript calculate the sum of all input fields with a specific class

2 Answers2