JSFiddle - React, Tailwind, and code Playground

HTML

<div class="line-reservation frow " id="_1">
  <div class="check">
    <input type="checkbox" value="11" id="check_11" name="check_11">
    <label for="check_11" class="simple"></label>
  </div>
  <div class="fcol11">Lefebvre
    <br>Nicolas</div>
  <div class="fcol7">29/09/2016</div>
  <div class="fcol5">2</div>
  <div class="fcol5">service3</div>
  <div class="fcol14 description">Indispo de 13h00 à 14h00</div>
  <div class="fcol5">Indispo de 13h00 à 14h00</div>
  <div class="fcol10">

    <div class="fbetween frow" id="">
      <div id="restauration_11"></div>
      <select id="restauration_affectation[11][jour1]" name="restauration_affectation[11][jour1]">
        <option value="">-</option>
        <option value="service1" id="a_11">Service 1</option>
        <option value="service2" id="b_11">Service 2</option>
        <option value="service3" selected="" id="c_11">Service 3</option>
        <option value="0">Pas de table disponible</option>
      </select>
      <a href="/app_dev.php/fr/restauration/demande/commande/11" class="action modifiy">
        <img src="/bundles/front/img/picto-modification.png" alt="Modifier la demande" title="Modifier la demande"></a>
      <div class="fcol5">
        <a href="#" class="action validate " id="_11" data-title="Validation" data-body="Confirmez-vous la validation de la demande N°NL_RES_021216_0004 d'un montant de 300,00 euros ?">
          <img src="/bundles/front/img/picto-validate.png" alt="Valider la demande" title="Valider la demande"></a>

      </div>
    </div>
  </div>
</div>
<div class="line-reservation frow " id="_2">
  <div class="check">
    <input type="checkbox" value="12" id="check_12" name="check_12">
    <label for="check_12" class="simple"></label>
  </div>
  <div class="fcol11">Lefebvre
    <br>Nicolas</div>
  <div class="fcol7">29/09/2016</div>
  <div class="fcol5">2</div>
  <div class="fcol5">service3</div>
  <div class="fcol14 description">Indispo de 13h00 à 14h00</div>
  <div...

JavaScript

$( function(){
$(".action.validate").on('click', function(e){
 e.preventDefault();
 console.log( $(this).parents('.line-reservation:eq(0)').attr('id') )

});
})