data-th JS only works once per page

Question

I am using the code from this CodePen to make my tables responsive: http://codepen.io/anon/pen/myayee

Everything on my site is working as in his example, however I want to add more than 1 table to the page. When I do this, only the first table on the page get's the "data-th=" added to it when the browser is made smaller, the rest of the tables are blank. I would like it to be added to all of the table headers on the page, but not sure how to change his code to accomplish it.

I changed some of the classes, so here is my code (tables cut down in the interest of space):

//JS FOR RESPONSIVE TABLES
var headertext = [],
headers = document.querySelectorAll(".responsive th"),
tablerows = document.querySelectorAll(".responsive th"),
tablebody = document.querySelector(".responsive tbody");

for(var i = 0; i < headers.length; i++) {
  var current = headers[i];
  headertext.push(current.textContent.replace(/\r?\n|\r/,""));
} 
for (var i = 0, row; row = tablebody.rows[i]; i++) {
  for (var j = 0, col; col = row.cells[j]; j++) {
    col.setAttribute("data-th", headertext[j]);
  } 
}

HTML

<table class="responsive mesh">
<thead>
<tr>
<th>Phifer</th>
<th>Openness</th>
<th>Sun/UV</th>
<th>Protection</th>
<th>Sample</th>
</tr>
</thead>
<tbody>
<tr>
<td>18/14 - Charcoal</td>
<td>58%</td>
<td>Up To 40%</td>
<td>Blockage</td>
<td><img src="http://minnesotascreens.cloudaccess.host/wp-content/uploads/2015/03/mesh_1814_charcoal.jpg" alt="mesh_1814_charcoal" class="alignnone size-full wp-image-227" /></td>
</tr>
</tbody>
</table>

<hr/>

<table class="responsive mesh">
<thead>
<tr>
<th>Phifer 20/30</th>
<th>Openness</th>
<th>Sun/UV</th>
<th>Protection</th>
<th>Sample</th>
</tr>
</thead>
<tbody>
<tr>
<td>Charcoal</td>
<td>32%</td>
<td>Up To 65%</td>
<td>Blockage</td>
<td><img src="http://minnesotascreens.cloudaccess.host/wp-content/uploads/2015/03/mesh_2030_charcoal.jpg" alt="mesh_2030_charcoal" class="alignnone size-full wp-image-236" /></td>
</tr>
</tbody>
</table>

My Site: http://minnesotascreens.cloudaccess.host/products/phantom-retractable-door-screens/

Answer 1

You need to iterate all tables, then all rows and cells inside every table. Try something like this:

var tables = document.querySelectorAll(".responsive"),
    tbody, headers, headertext, i, j, k;

for (i = 0; i < tables.length; i++) {

    tbody = tables[i].tBodies[0];
    headers = tables[i].tHead.rows[0].children;
    headertext = [];

    for (j = 0; j < headers.length; j++) {
        headertext.push(headers[j].textContent.trim());
    }

    for (j = 0; j < tbody.rows.length; j++) {
        for (k = 0; k < tbody.rows[j].cells.length; k++) {
            tbody.rows[j].cells[k].setAttribute("data-th", headertext[k]);
        }
    }    
}

Demo: http://jsfiddle.net/6kkb3369/