jsp - How to set conditional visibility in html? -


i have following code:

<div class="form__group form__group--select" id="choice">                                 <select name="area" class="selectbox form__element">                                     <option selected="selected" value="">sparte auswählen</option>                                     <option value="erdgas">erdgas</option>                                     <option value="strom">strom</option>                                     <option value="telekommunikation">telekommunikation</option>                                     <option value="energiedienstleistungen">energiedienstleistungen</option>                                 </select>                                 <div class="form__message">                                     <div class="form__infotext"></div>                                     <div class="form__error"></div>                                 </div>                             </div>                         </div>                          <div class="columns medium-6" id="kwh">                             <t:optionaltextfield label="ihr jahresverbrauch in kwh" name="kwhperyear" maxlength="100"/>                         </div>

i make "columns medium-6" visible if particular item selected in "selectbox form__element", example "strom". mention code taken .jsp file in there no 'head' , 'body' tags.

i tried this:

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.5.1/jquery.min.js"></script>  <script>     $(document).ready(function (){         $("#choice").change(function() {             if ($(this).val() == "erdgas" || (this).val() == "strom") {                 $("#kwh").show();             }else{                 $("#kwh").hide();             }         });     }); </script>

but didn't work....i missed something, , don't know ehre best place put javascript code.

i updated code.

try below code , working fine.

$(document).ready(function (){          $(".selectbox").change(function() {              if ($(this).val() == "erdgas" || $(this).val() == "strom") {                  $("#kwh").show();              }else{                  $("#kwh").hide();              }          });      });
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>  <div class="form__group form__group--select" id="choice">                                  <select name="area" class="selectbox form__element">                                      <option selected="selected" value="">sparte auswählen</option>                                      <option value="erdgas">erdgas</option>                                      <option value="strom">strom</option>                                      <option value="telekommunikation">telekommunikation</option>                                      <option value="energiedienstleistungen">energiedienstleistungen</option>                                  </select>                                  <div class="form__message">                                      <div class="form__infotext"></div>                                      <div class="form__error"></div>                                  </div>                              </div>                                                      <div class="columns medium-6" id="kwh">                              <label name="kwhperyear" maxlength="100">ihr jahresverbrauch in kwh</label>                          </div>


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