jquery - how find next row of button clicked in td? -

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i have table , every row have row dispaly:none.
want when clicked span in td of visible row next row visible.

i tried :-

$('span').click(function()             $(this).closest('tr').next('tr').css('display','block')         })

this switch display block tr not displayed correctly when it's display block default. when try next row width first column of currnet tr. whats problem?

 <tr>     <td style="width:40px"></td>     <td><span>show</span></td>     <td></td>  </tr>   <tr "style=display:none">     <td colspan="4" >         <h5>پاسخ دادن</h5>         <textarea style="width:100%;"></textarea>      </td>   </tr>

one easy solution set display blank like

$('span').click(function() {    $(this).closest('tr').next('tr').css('display', '');//or set table-row default display tr  })
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>  <table>    <tr>      <td style="width:40px"></td>      <td><span>show</span></td>      <td></td>    </tr>    <tr style="display:none">      <td colspan="3">        <h5>پاسخ دادن</h5>        <textarea style="width:100%;"></textarea>      </td>    </tr>  </table>


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