javascript - JS function not getting dropdown text -

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i have dropdown form have created - need have dropdown either auto-generated text box once selected or have placed in text box once button has been pressed. example "get hex"

here dropdown:

<fieldset>   <legend>logos</legend>   <p>     <label>choose desired logo</label>     <select id = "logo">       <option value = "00">holden</option>       <option value = "01">hsv</option>       <option value = "02">chevrolet</option>       <option value = "02">chevrolet</option>       <option value = "04">csv</option>       <option value = "05">pontiac</option>     </select>     <input type="button" value="show hex" onclick="displayselecteditem(val);" />   </p>   <p>     <input type="text" id="logo" />   </p> </fieldset>

and here last js script i've tried. have tried few surely missing nothing command works.

<script language="javascript" type="text/javascript"> <!-- function displayselecteditem(val) {   alert(val); } //--> </script>

so need text box contain hex code in <option value = "##">

i'll using throughout 6 different forms, needing same thing.

change

<input type="button" value="show hex" onclick="displayselecteditem(val);" />

to

<input type="button" value="show hex" onclick="displayselecteditem(document.getelementbyid('logo').value);" />

jsfiddle example


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