Getting values from multiple text boxes on keypress in javascript

Question

I have 8 different text fields in my form, it's a part of customer bill. Here it is

<input type="text" name="txtcustomduty" class="form-control" placeholder="Customs Duty">
<input type="text"  name="txtlcltranspotation" class="form-control" placeholder="Local Transportation">
......

up to 8

From this I want to show the sum of all the values as total value

<span>Total extra cost:1678</span>

It should be changed when the values of any text field is changed, so how can I do it perfectly using keyup event?

UPDATE

I have attached an onkeyup event to each textfield

`onkeyup="findSum(this.value)"'

and i am using a global array for store the input values var extras=[]

function findSum(value)
{
    if(value!=''){
        console.log(value);
        extras.push(parseInt(value));
        if(extras!='')
        $('#extratotal').text(extras.reduce(getSum));
        else $('#extratotal').text('0');
    }
}

But its not worked well

Great question, but what have you tried so far?

Dacaspex
– Dacaspex

2016-05-17 09:37:14 +00:00
Commented May 17, 2016 at 9:37 — Dacaspex
– Dacaspex, Commented May 17, 2016 at 9:37

Shady Alset · Accepted Answer · 2016-05-17 10:11:09Z

2

You can get SUM of all inputs that have form-control class on keyup event like this:

$('input.form-control').on('keyup',function() {   
    var total = 0;
    $('input.form-control').each(function(){
        if (this.value == ''){
            total += parseInt(0);
        }else{
            total += parseInt(this.value);
        }
    });
    $('#total').val(total);
});

input {
   display: block;   
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="text" name="txtcustomduty" class="form-control" placeholder="Customs Duty" >
<input type="text"  name="txtlcltranspotation" class="form-control" placeholder="Local Transportation" >
<input type="text"  name="other" class="form-control" placeholder="other" >

Total extra cost: <input id="total" >

edited May 17, 2016 at 10:11

answered May 17, 2016 at 9:47

Shady Alset

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5 Comments

Blessan Kurien Over a year ago

Worked partially but getting NAn

Shady Alset Over a year ago

@BlessanKurien Very odd, it works perfectly for me, have you filled all inputs with valid values?

Blessan Kurien Over a year ago

Yes i filled up with numeric

Blessan Kurien Over a year ago

Its worked dude:) actually its my mistake ,i've typo in my class name

Shady Alset Over a year ago

@BlessanKurien that's nice, glad to help you :)

whostolemyhat · Accepted Answer · 2016-05-17 09:37:41Z

2

You can use the target.value property of the event passed to the key listener - this will give you the value of the input field:

document.addEventListener('input', 'keyup', function(e) {
    // use e.target.value here
}

Just add this to a running total and update the text inside the listener function.

answered May 17, 2016 at 9:37

whostolemyhat

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Comments

Vijay Wilson · Accepted Answer · 2016-05-17 10:12:02Z

1

I have defined in JavaScript instead of jQuery. Try it..

<script>
function sum()
{

    var sum = 0;
    var array_field = document.getElementsByClassName('sum_field');
    for(var i=0; i<array_field.length; i++)
    {
         var value = Number(array_field[i].value);
         if (!isNaN(value)) sum += value;
    }
    document.getElementById("total").innerHTML = sum;
 }
</script>
<body>
    <input type="text" name="txtcustomduty" class="form-control sum_field" placeholder="Customs Duty" onkeyup="sum()">
    <input type="text"  name="txtlcltranspotation" class="form-control sum_field" placeholder="Local Transportation" onkeyup="sum()">
    <p>Total:<span id="total">0</span></p>
</body>

answered May 17, 2016 at 10:12

Vijay Wilson

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