handlebar-helper {{attr}} not working with colspan

[Mika571]

I am trying to use the following helpers {{attr colspan=(add samples.length 1)}} while this appears to render correctly as plain text it does not work when on a <td> element. Here is my code snippet:

{{attr colspan=(add samples.length 1)}}
<table class="table table-bordered table-condensed">
    <tr>
        <td {{attr colspan=(add samples.length 1)}} class="sample-info-th text-center">
            <strong>Sample History</strong>
        </td>
        <td class="sample-info-th text-center" colspan="2"></td>
    </tr>
    <tr>
        <td >Sample Date</td>
        {{#each samples as |sample index|}}
        <td > {{date sample._kmd.ect "DD/MM/YYYY"}} </td>
        {{/each}}
    </tr>
    <tr>
      <td>ID</td>
      {{#each samples as |sample index|}}
      <td >{{sample.BottleBarcode}}</td>
      {{/each}}
    </tr>
    <tr>
      <td>SMU</td>
      {{#each samples as |sample index|}}
      <td  >{{sample.SMU}}</td>
      {{/each}}
    </tr>
    <tr>
      <td>Oil Changed</td>
      {{#each samples as |sample index|}}
      <td >{{sample.OilChanged}}</td>
      {{/each}}
    </tr>
    <tr>

[jan_blaha]

Please provide playground link replicating the issue. Thank you.
https://playground.jsreport.net/

[Mika571]

How do I allow the handlebar-helper module in the playground?

[jan_blaha]

Ah, that is not possible.

Could you try to use {{{atr .... }}} ? That could help

[Mika571]

Found the following workaround

{{lookup (first test) "a"}}
{{lookup (last test) "a"}}