JSFiddle - React, Tailwind, and code Playground

HTML

<table id="oustandingItems">
  <tr><th>Category</th></tr>
  <tr><td><input name="mytest" /></td></tr>
  <tr><td><input name="mytest" value="123"/></td></tr>
  <tr><td><input name="mytest" /></td></tr>
  <tr><td><input name="mytest" /></td></tr>
</table>


<button id="findRow">Find Row</button>
<input type="text" id="myRow" />

JavaScript

$("#findRow").click(function() {   
  var tableRow = $('#oustandingItems tr:has(td input[value!=""])').prevAll().length;  
  $("#myRow").val(tableRow);
});