javascript - How to get number of elements with certain class that occur before current element in a table? -


i trying index tr of table class slot , slineitem

lineitem comes under lot in hierarchy. 

    <table style="width:100%;" id="summarytable">          <tr class="slot">              <td>lot1</td>          </tr>          <tr class="slineitem">              <td>lineitem1</td>          </tr>          <tr class="slot">              <td>lot2</td>          </tr>      </table>

i want :

1   lot1     lot1 desc 1.1 lineitem1 2   lot2 2.1 lineitem1 under lot2

assume, using table option.

i think work 

//add column rows  $('tr').prepend($('<td />', {    class: 'srno'  }));    $('.slot').each(function(i, el) {    //get index of current slot element    var index = + 1;    //set current slot rows index text     $(el).find('.srno').text(index);    //find rows in between , next slot .slineitem , set text    $(el).nextuntil('.slot').filter('.slineitem').each(function(j, el2) {      $(el2).find('.srno').text(index + '.' + (j + 1));    });  });
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>  <table style="width:100%;" id="summarytable">    <tr class="slot">      <td>lot1</td>    </tr>    <tr class="slineitem">      <td>lineitem1</td>    </tr>    <tr class="slot">      <td>lot2</td>    </tr>  </table>

https://jsfiddle.net/4p0sw3fy/1/


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