Problem assigning data attribut value.

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I am trying assign data attribute to th element on click so that I could sort the table. But it's not working

Dom.

HTML

<thead>
    <tr>
        <th class="sort-odrdtl-tbl" data-column="0" data-sort-dir="asc">OrderId</th>
        <th class="sort-odrdtl-tbl" data-column="1" data-sort-dir="asc">Descriptions</th>
        <th class="sort-odrdtl-tbl" data-column="2" data-sort-dir="asc">Quatity</th>
        <th class="sort-odrdtl-tbl" data-column="4" data-sort-dir="asc">Requested Date</th>
        <th class="sort-odrdtl-tbl" data-column="5" data-sort-dir="asc">Reason</th>
    </tr>
</thead>

What I have tried:

$(document).ready(function () {


       // initialization

       $('#loadingWait').hide();

       var token = $('[name=__RequestVerificationToken]').val();



       $('.sort-odrdtl-tbl').on('click', function () {

          $(this).data('sort-dir', 'desc');
           //$(this).first().data('sort-dir', 'desc');


           debugger;

       })

   });

Posted 20-Mar-18 6:21am

istudent

Updated 20-Mar-18 6:39am

Patrice T

v3

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Richard Deeming · Answer 1 · 2018-03-20T06:40:00

Solution 1

When you access a data attribute through code, the "kebab-case" name is converted to "camelCase". So you need to use:

JavaScript

$(this).data('sortDir', 'desc');

Using data attributes - Learn web development | MDN[^]

Posted 20-Mar-18 6:40am

Richard Deeming

Comments

istudent 20-Mar-18 14:23pm

var dirVal = $(this).data('sort');

if (dirVal === 'asc') {

$(this).data('sort', 'desc');
}
else {
$(this).data('sort', 'asc');
}

console.log($(this).data('sort'));

I can see in value desc in console log, but it did not update th element.
for simplicity i changed data-sort-dir to data-sort

Richard Deeming 20-Mar-18 15:24pm

The data method only updates the element's dataset; it doesn't change the attribute on the element.

If you want to change the attribute as well, you'll need to use the attr method:

var $me = $(this);
if ($me.data("sort") === "asc"){
    $me.data("sort", "desc").attr("data-sort", "desc");
}
else {
    $me.data("sort", "asc").attr("data-sort", "asc");
}

istudent 21-Mar-18 10:48am

it did not updated
<th class="sort-odrdtl-tbl" data-column="0" data-sort="asc">OrderId</th>

to

<th class="sort-odrdtl-tbl" data-column="0" data-sort="desc">OrderId</th>

I hope you know what I am trying to achieve here. I want add sort functionality on table head. and preserve its value for subsequent request.

Richard Deeming 21-Mar-18 15:05pm

If $me.data("sort", "desc").attr("data-sort", "desc"); doesn't change the attribute in the browser's developer tools, then you're not updating the correct element.

NB: Make sure you're looking at the element in the developer tools, and not the "view source"; the tools reflect the current state of the DOM, whereas "view source" shows you the source as returned by the server.