How to sum the dynamic created rows in jquery

Question

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So i am trying to make a form which i can add a new row and key in value in the amount then the total will sum up and show the value immediately. The keyup function and add row function are working but its doesn't sum up the append row's values.

What I have tried:

HTML

<table>
<tbody id="calculation">
<td><input class="underline-input" type="number" name="item" /></td>
<td><input class="underline-input amount" type="number" id="amount" name="amount"/></td>
</tbody>
<tr>
<th colspan="2">TOTAL RM</th>
<td><input class="underline-input" type="number" id="total" name="total" /></td>
</tr>
</table>

Script

  $(document).ready(function(){

        $('.amount').keyup(function(){

        var sum=0;
 
        $('.amount').each(function(){
        sum+=Number($(this).val());
        });

        $('#total').val(sum);

        });
}

    function addRow() {    
        var template = '';
        template += '<tr>';
        template += '<td><input class="underline-input" type="number" name="item" />
        template += '<td><input class="underline-input amount" type="number" id="amount" name="amount" /></td>';
        template += '</tr>';
    
        $("#calculation").append(template);

        });

Posted 23-Sep-20 23:55pm

BBO001

Updated 24-Sep-20 0:43am

v2

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F-ES Sitecore · Answer 1 · 2020-09-24T00:43:00

First off there is a typo in your addRow function, you are missing an end quote and semi-colon

JavaScript

function addRow() {
    var template = '';
    template += '<tr>';
    template += '<td><input class="underline-input" type="number" name="item" />'; // <----
    template += '<td><input class="underline-input amount" type="number" id="amount" name="amount" /></td>';
    template += '</tr>';

    $("#calculation").append(template);
}

The other problem is that you attach the keyup event to all items with class "amount", however that only attaches to items that exist when the call is made, ie on DOM load, so any "amount" items you add after won't have the event attached. You can use the "on" method to attach events instead which will also work for items you add later.

JavaScript

$(document).ready(function () {

    $('#calculation').on("keyup", ".amount", function () {

        var sum = 0;

        $('.amount').each(function () {
            sum += Number($(this).val());
        });

        $('#total').val(sum);

    });
});

function addRow() {
    var template = '';
    template += '<tr>';
    template += '<td><input class="underline-input" type="number" name="item" />';
    template += '<td><input class="underline-input amount" type="number" id="amount" name="amount" /></td>';
    template += '</tr>';

    $("#calculation").append(template);
}