javascript - Give all child elements classes -

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im trying give child elements class per group. each groups children have same class each group, , each element should have different class.

this got far: 

var $span = $("tr.keep td"); $span.attr('id', function (index) { return 'td' + index; });

the problem have multiple groups of same parent - script runs trough of them instead repeating class each group. how ad .each on script, or better way?

html:

  <tr class="keep">    <tr class="test">     <td rowspan="2"><a href="/"><img src="/" alt=""></a></td>     <td colspan="3"><a href="/">text</a></td>    </tr>    <tr class="test">     <td>mf216n/a</td>     <td>apple</td>     <td class="outofstock">0</td>     <td>1&nbsp;054,24sek</td>     <td><input type="button" class="actionbutton" value="köp" onclick="buy(this, 65360, null, null,null, '/ajax/buy')"></td>    </tr>  </tr>     <tr class="keep">    <tr class="test">     <td rowspan="2"><a href="/"><img src="/" alt=""></a></td>     <td colspan="3"><a href="/">text</a></td>    </tr>    <tr class="test">     <td>mf216n/a</td>     <td>apple</td>     <td class="outofstock">0</td>     <td>1&nbsp;054,24sek</td>     <td><input type="button" class="actionbutton" value="köp" onclick="buy(this, 65360, null, null,null, '/ajax/buy')"></td>    </tr>  </tr>

use tr.test selector select tr elements having class .test. iterate selected elements using .each , find td elements children of selected-tr elements. loop through td elements , and add class using .addclass considering index.

note: tr elements can not have tr children. invalid-markup

var $span = $("tr.test");  $span.each(function(i, elem) {    $(elem).find('td').each(function(index) {      $(this).addclass(function() {        return 'td_' + (index + 1);      });    });  });
.td_1 {    background: yellow;  }  .td_2 {    background: green;  }  .td_3 {    background: pink;  }  .td_4 {    background: orange;  }  .td_5 {    background: blue;  }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>  <table>    <tr class="keep">      <td rowspan="2">        <a href="/">          <img src="/" alt="">        </a>      </td>      <td colspan="3"><a href="/">text</a>      </td>    </tr>    <tr class="test">      <td>mf216n/a</td>      <td>apple</td>      <td class="outofstock">0</td>      <td>1&nbsp;054,24sek</td>      <td>        <input type="button" class="actionbutton" value="köp" onclick="buy(this, 65360, null, null,null, '/ajax/buy')">      </td>    </tr>      <tr class="keep">      <td rowspan="2">        <a href="/">          <img src="/" alt="">        </a>      </td>      <td colspan="3"><a href="/">text</a>      </td>    </tr>    <tr class="test">      <td>mf216n/a</td>      <td>apple</td>      <td class="outofstock">0</td>      <td>1&nbsp;054,24sek</td>      <td>        <input type="button" class="actionbutton" value="köp" onclick="buy(this, 65360, null, null,null, '/ajax/buy')">      </td>    </tr>  </table>

fiddle demo


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