javascript - 2 Select with same options, alerting when it is already selected at the first Select -


i'm having hard time this, have 2 select same options. 2 select inputs named registrationdiscounttype1 , registrationdiscounttype2

so first choose discount registrationdiscounttype1 if add discount registrationdiscounttype2 if option selected in discount number 1 show error discount selected.

i've made javascript based on i've search far, can't make work, can me wrong code, or should use?

this sample photo enter image description here

// change in discount 2	    $("#registrationdiscounttype2").unbind('change').bind('change', function()     if ($('#registrationdiscounttype2').closest('table').find('option[value=' + $('#registrationdiscounttype1').val() + ']:selected').length > 1)  {  alert('discount selected, please choose one');     }    });
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.1/jquery.min.js"></script>  <div class="form-group">    <label for="registrationdiscounttype1" class="col-sm-4 control-label">discount 1: </label>    <div class="col-sm-8">      <select class="form-control" name="registrationdiscounttype1" id="registrationdiscounttype1">      <option value="">select discount </option>      <?php foreach ($discounttypedata $discounttype)      {      ?>      <option value="<?php echo $discounttype['discounttype_id']; ?>"> <?php echo $discounttype['discounttype_name']; ?> </option>        <?php       }       ?>      </select>    </div>  </div>    <div class="form-group">    <label for="registrationdiscounttype2" class="col-sm-4 control-label">discount 2: </label>    <div class="col-sm-8">    <select class="form-control" name="registrationdiscounttype2" id="registrationdiscounttype2">    <option value="">select discount </option>    <?php foreach ($discounttypedata $discounttype)    {    ?>    <option value="<?php echo $discounttype['discounttype_id']; ?>"> <?php echo $discounttype['discounttype_name']; ?> </option>      <?php     }     ?>    </select>  </div>  </div>

u can try

$(document).ready(function(){    $("#registrationdiscounttype2").unbind('change').bind('change', function() {      if ($('#registrationdiscounttype2').val() == $('#registrationdiscounttype1').val())    {    alert('discount selected, please choose one');       }      });  });
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>  <div class="form-group">    <label for="registrationdiscounttype1" class="col-sm-4 control-label">discount 1: </label>    <div class="col-sm-8">      <select class="form-control" name="registrationdiscounttype1" id="registrationdiscounttype1">      <option value="">select discount </option>      <option value="1">1 </option>      <option value="2">2 </option>      </select>    </div>  </div>    <div class="form-group">    <label for="registrationdiscounttype2" class="col-sm-4 control-label">discount 2: </label>    <div class="col-sm-8">    <select class="form-control" name="registrationdiscounttype2" id="registrationdiscounttype2">    <option value="">select discount </option>      <option value="1">1 </option>      <option value="2">2 </option>    </select>  </div>  <div class="form-group" id="result">      </div>


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