html - Javascript fails to get the value of a text input -


my code below works if manually set value of command, if try value dynamically code stops working altogether. isolated line of code seems problem(comment after saying error is).

if comment line alert(document.getelementbyid("cdmtxt").value); works intended.

<?php session_start(); ?> <!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml">  <head> <meta content="en-us" http-equiv="content-language" /> <meta content="text/html; charset=utf-8" http-equiv="content-type" /> <script type='text/javascript'>  function exec(){     alert("hi");     alert(document.getelementbyid("cdmtxt").value); //does not seem execute???     var command = "word";     var xmlhttp = new xmlhttprequest();     xmlhttp.onreadystatechange = function() {         if (xmlhttp.readystate == 4 && xmlhttp.status == 200) {             var txttoupdate = document.getelementbyid("txthint");             txttoupdate.innerhtml = txttoupdate.innerhtml + xmlhttp.responsetext + "<br/><br/>";         }     }     xmlhttp.open("get", "has-sync.php?exec=" + command, true);     xmlhttp.send(); } </script> <style type="text/css"> .auto-style1 {     margin-top: 0px; } </style> </head>  <body>  <table style="width: 100%">     <tr>         <td style="width: 141px; height: 390px">managers<br /> dhts</td>         <td name="targetthing" style="height: 390px">             <form onsubmit="exec();return false">                 <input id="cmdtxt" class="auto-style1" name="text1" type="text">                 <input type="submit">             </form>             <br />             <div id="txthint" style="overflow: scroll; border:1px solid black;width:80%;height:80%"></div>         </td>     </tr> </table>  </body>  </html>

any appreciated!

you have typo:

getelementbyid("cdmtxt") // should "cmdtxt"

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