[Solved] Obtain the value variable [closed]

You can use document.querySelector to get elements on the page, with attribute selector. querySelector and querySelectorAll accepts CSS selectors like jQuery.

console.log(document.querySelector('[class*="sample-row"] .co-1').innerText)
console.log(document.querySelector('[class*="sample-row"]').className.replace(/sample-row-/, ''))

<div class="sample-row-xxxxxx">
<div class="co-1 xxxxxxx">value</div>
</div>

the selector will find any element that have sample-row somewhere inside class attribute that have .col-1 element inside.

If you’re know for sure that is at the beginning of the class you can use [class^="sample-row"] selector instead but you can have other classes before sample-row.