html - Disable a field after selection -


in piece of code need disable department field when approved selected in status(above field) , should active when clarifications selected must enabled. please try helping !

<form name="index" action="director">     <table border="0"  style="width:300px">         <tbody bgcolor>             <p> date: <%= df.format(new java.util.date()) %> </p>             <tr>                 <td height="40"><font color="blue">branch:</td>                 <td>                      <select name="dbranch" id="dbranch" >                         <option value="select">select</option>                         <option value="kakinada">kakinada</option>                         <option value="vishakapatnam">vishakapatnam</option>                         <option value="tirupathi">tirupathi</option>                         <option value="vijayawada">vijayawada</option>                         <option value="warangal">warangal</option>                         <option value="hyderabad">hyderabad</option>                     </select>                 </td>             </tr>                                             <tr>                 <td height="40"><font color="blue">doc id :</td>                 <td>                 <select id="inw_id" name="inw_id">                 <option value='0'>select doc id</option>                 </select>                 </td>             </tr>             <tr>                 <td height="40"><font color="blue">status:   </td>                 <td>                     <select name="status" id="status" >                         <option value="">status</option>                         <option value="approved">approved</option>                         <option value="clarifications">clarifications</option>                     </select>                 </td>             </tr>             <tr>                 <td height="40"><font color="blue">department:   </td>                 <td>                     <select name="dept" id="dept" >                         <option value=""> </option>                         <option value="admin">admin</option>                         <option value="accounts">accounts</option>                         <option value="other">other</option>                     </select>                 </td>             </tr>         </tbody>     </table>     <tr><td><td align="right"><input name="submit" type="submit" value="submit"style="background-color:lightblue;margin-left:15px;height: 40px;width: 100px; margin-right: -30px;"></td></td></tr> </form>

we tried writing function, did not work :(

function doenable() {     if(document.getelementbyid("status")!="null") {         document.getelementbyid("department").disabled=false;     } }

if want plain javascript solution try following.

<html>    <head>    <script type='text/javascript'>      function change(thestatus) {        if (thestatus.value == "approved") {          document.getelementbyid("dept").disabled = true;        } else {          document.getelementbyid("dept").disabled = false;        }      }    </script>  </head>    <body>    <select name="status" id="status" onchange="change(this)">      <option value="">status</option>      <option value="approved">approved</option>      <option value="clarifications">clarifications</option>    </select>    <select name="dept" id="dept">      <option value=""></option>      <option value="admin">admin</option>      <option value="accounts">accounts</option>      <option value="other">other</option>    </select>  </body>    </html>


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