javascript - Show input field only if a specific option is selected -

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i'm trying make form checks if option selected "select" tag. here current html:

<select onchange="yesnocheck()">     <option id="nocheck" value="">valitse automerkkisi</option>     <option id="nocheck" value="lada">lada</option>     <option id="nocheck" value="mosse">mosse</option>     <option id="nocheck" value="volga">volga</option>     <option id="nocheck" value="vartburg">vartburg</option>     <option id="yescheck" value="other">muu</option> </select>

this div element should become visible after "muu" selected:

<div id="ifyes" style="display: none;">     <label for="car">muu, mikä?</label> <input type="text" id="car" name="car" /><br /> </div>

and here javascript i'm trying use:

<script type="text/javascript">     function yesnocheck() {         if (document.getelementbyid("yescheck").checked) {             document.getelementbyid("ifyes").style.display = "block";         } else {             document.getelementbyid("ifyes").style.display = "none";         }     } </script>

but it's not working...

here go:

<select onchange="yesnocheck(this);">     <option value="">valitse automerkkisi</option>     <option value="lada">lada</option>     <option value="mosse">mosse</option>     <option value="volga">volga</option>     <option value="vartburg">vartburg</option>     <option value="other">muu</option>     </select>      <div id="ifyes" style="display: none;">     <label for="car">muu, mikä?</label> <input type="text" id="car" name="car" /><br />      <script>     function yesnocheck(that) {         if (that.value == "other") {             alert("check");             document.getelementbyid("ifyes").style.display = "block";         } else {             document.getelementbyid("ifyes").style.display = "none";         }     } </script>

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