Calculate the sum of the time for column

Question

I have this table:

<table id="total" border="1" width="100%">
    <tbody>
        <tr>
            <td>Total duration time</td>
            <td class="total_duration_time"></td>
        </tr>
    </tbody>
</table>
<table id="data" border="1" width="100%">
    <tbody>
        <tr>
            <td>Anna</td>
            <td>318</td><td class="duration_time">00:00:50</td>
            <td>62700</td>
        </tr>
        <tr>
            <td>Bob</td>
            <td>318</td>
            <td class="duration_time">00:00:27</td>
            <td>62703</td>
        </tr>
        <tr>
            <td>Mike</td>
            <td>318</td>
            <td class="duration_time">00:00:36</td>
            <td>88455233284</td>
        </tr>
    </tbody>
</table>

I need to calculate the sum of the column with class duration_time and print result in to column with class total_duration_time.

How to do this on JavaScript or jQuery?

I tried to use the code from this example http://jsfiddle.net/unKDk/13/, but it does not calculate the amount of time if instead of numbers substitute a value of type 00:00:00.

Answer 1

The easiest way is to work with seconds. I mean, you can convert each duration to seconds, make the total and then show where you need using another function that converts the seconds to hh-mm-ss format.

You can check how it looks and it works here

Note : the function toHHMMSS() is taken form here

Answer 2

Here's a full example with carry (assuming the format is HOURS:MINUTES:SECONDS), maybe not the best solution for computation:

HTML

<table id="sum_table" width="300" border="1">
<tr class="titlerow">
    <td>Apple</td>
    <td>Orange</td>
    <td>Watermelon</td>
</tr>
<tr>
    <td class="rowDataSd">00:55:23</td>
    <td class="rowDataSd">00:55:23</td>
    <td class="rowDataSd">00:55:23</td>
</tr>
<tr>
    <td class="rowDataSd">00:55:23</td>
    <td class="rowDataSd">00:55:23</td>
    <td class="rowDataSd">00:55:23</td>
</tr>
<tr>
    <td class="rowDataSd">00:55:23</td>
    <td class="rowDataSd">00:55:23</td>
    <td class="rowDataSd">00:55:22</td>
</tr>
<tr class="totalColumn">
    <td class="totalCol">Total:</td>
    <td class="totalCol">Total:</td>
    <td class="totalCol">Total:</td>
</tr>
</table>

JS

var totals = [[0,0,0], [0,0,0], [0,0,0]];
$(document).ready(function () {

var $dataRows = $("#sum_table tr:not('.totalColumn, .titlerow')");

$dataRows.each(function () {
    $(this).find('.rowDataSd').each(function (i) {
        time = $(this).html().split(":")
        totals[i][2] += parseInt(time[2]);
        if(totals[i][2] > 60)
        {
            totals[i][2] %= 60;
            totals[i][1] += parseInt(time[1]) + 1;          
        }
        else
            totals[i][1] += parseInt(time[1]);

        if(totals[i][1] > 60)
        {
            totals[i][1] %= 60;
            totals[i][0] += parseInt(time[0]) + 1;          
        }
        else
            totals[i][0] += parseInt(time[0]);
    });
});
$("#sum_table td.totalCol").each(function (i) {
    console.log(totals[i]);
    $(this).html("total:" + totals[i][0] + ":" + totals[i][1] + ":" + totals[i][2]);
});

});

http://jsfiddle.net/unKDk/192/