Edit fiddle - JSFiddle - React, Tailwind, and code Playground

JSFiddle - React, Tailwind, and code Playground

HTML

<div id="doc" class="docParent">
  <input type="checkbox" name="check2" class="ballu" value="123" data-docnumber="S004">
  <input type="checkbox" name="check2" class="ballu" value="123" data-docnumber="B004">
  <input type="checkbox" name="check2" class="ballu" value="123" data-docnumber="B005">
</div>

JavaScript

alert($("#doc").find("input[name='check2'] [data-doknumber*='S']").length > 0)

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JSFiddle - React, Tailwind, and code Playground

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