如何从javascript获取列的所有行的总和？

Question

I have an html table

<table class="table">
    <thead class="table-primary">
        <tr>
            <th>Date</th>
            <th>SKU</th>
            <th style="width: 300px;">Activity</th>
            <th>QTY</th> 
            <th>RATE</th>
            <th>AMOUNT</th>
        </tr>
    </thead>
    <tbody>
        
                <tr>
                    <td>09/01/2020</td>
                    <td></td>
                    <td>
                        <strong>Test</strong><br />
                        Manish Rijal - JOB# 12345 <br />
                        1TestBiraz
                    </td>
                    <td style="text-align: center">78</td>
                    <td style="text-align: center">56</td>
                    <td style="text-align: center">99</td>
                </tr>
                <tr>
                    <td>09/01/2020</td>
                    <td></td>
                    <td>
                        <strong>qwert</strong><br />
                        Manish Rijal - JOB# 12345 <br />
                        asd
                    </td>
                    <td style="text-align: center">8</td>
                    <td style="text-align: center">4</td>
                    <td style="text-align: center">32</td>
                </tr>
                <tr>
                    <td>09/01/2020</td>
                    <td></td>
                    <td>
                        <strong> Leave</strong><br />
                        Manish Rijal - JOB# 12345 <br />
                        asd
                    </td>
                    <td style="text-align: center">8</td>
                    <td style="text-align: center">4</td>
                    <td style="text-align: center">32</td>
                </tr>
  
    </tbody>


</table>

<div>
<a style="margin-left: 305px;">BALANCE DUE</a>
<strong>$800.00</strong>
</div>

The value of the amount is dynamic and there might be multiple row. Right Now I have done hard coded for $800.00. How can I sum the value of all Amount Column and display in Balance Due. I tried by couldn't get there.

https://jsfiddle.net/n6qo3u1b/

Answer 1

If you want to get the prices from Quantity and Rate then you can do it like.

var price = 0;
$('table tbody tr').each(function() {
  var rate = +$(this).find("td:nth-last-child(3)").text();
  var amount = +$(this).find("td:nth-last-child(2)").text();

  price = price + (rate * amount);
})

$('.price strong').text('$' + price)

Please note I've added the class price to the div that surrounds the "price/strong"

Demo

 var price = 0; $('table tbody tr').each(function() { var rate = +$(this).find("td:nth-last-child(3)").text(); var amount = +$(this).find("td:nth-last-child(2)").text(); price = price + (rate * amount); }) $('.price strong').text('$' + price)

 table { font-family: arial, sans-serif; border-collapse: collapse; width: 100%; margin-top: 30px; } td, th { /*border: 1px solid #dddddd;*/ text-align: left; padding: 8px; } thead { background: #DCE9F1 } thead tr th { color: #4F90BB; } tr:nth-child(even) { background-color: #dddddd; width: 50%; } hr { color: #5A97BF; width: 90%; text-align: center; height: 1px; } hr.new4 { border: 1px solid; }

 <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <table class="table"> <thead class="table-primary"> <tr> <th>Date</th> <th>SKU</th> <th style="width: 300px;">Activity</th> <th>QTY</th> <th>RATE</th> <th>AMOUNT</th> </tr> </thead> <tbody> <tr> <td>09/01/2020</td> <td></td> <td> <strong>Test</strong><br /> Manish Rijal - JOB# 12345 <br /> 1TestBiraz </td> <td style="text-align: center">78</td> <td style="text-align: center">56</td> <td style="text-align: center">99</td> </tr> <tr> <td>09/01/2020</td> <td></td> <td> <strong>qwert</strong><br /> Manish Rijal - JOB# 12345 <br /> asd </td> <td style="text-align: center">8</td> <td style="text-align: center">4</td> <td style="text-align: center">32</td> </tr> <tr> <td>09/01/2020</td> <td></td> <td> <strong> Leave</strong><br /> Manish Rijal - JOB# 12345 <br /> asd </td> <td style="text-align: center">8</td> <td style="text-align: center">4</td> <td style="text-align: center">32</td> </tr> </tbody> </table> <hr style="border-top: 1px dotted #5A97BF" /> <div class="price"> <a style="margin-left: 305px;">BALANCE DUE</a> <strong>$800.00</strong> </div>

Answer 2

You can also do it with vanilla javascript like so:

const nodes = document.querySelectorAll('td:last-child')
const arr = Array.from(nodes);

const res = arr.reduce((acc, curr) => {
  return acc += Number(curr.textContent)
}, 0)

console.log(res);