TypeError: document.getelementbyid(...) is null

New Here ,
Oct 13, 2013 Oct 13, 2013

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<html>

          <head>

                    <title>Port Scanner for Mozilla Firefox</title>

          </head>

 

          <body>

                    <form name="my_form" id="my_form" method="post" action="#" onsubmit="return displayMessage();">

                              <p align="center">URL/Domain Name/IP Address: <input type="text" size="20" name="uri" value="" placeholder="http://www.google.com" required/></p>

                              <table align="center" border="1" width=100% bgcolor="#f4fff0" bordercolor="green" cellspacing="2" cellpadding="2">

                                        <tr>

                                                  <td align="center">

                                                            Start port: <input type="text" size="5" name="start_port" maxlength="5">

                                                            End port: <input type="text" size="5" name="end_port" maxlength="5"><br>

                                                            <input type="submit" value="Scan all ports" name="scan_all"><br>

                                                            <input type="submit" value="Scan only open ports" name="scan_open">

                                                  </td>

 

                                        </tr>

                                        <tr>

                                                  <td align="center">

                                                            <input type="text" size="20" name="scan_tcp"><br>

                                                            <font color="#b1b1b1">Enter port numbers separated by space. (e.g. 21 25 80)</font><br>

                                                            <input type="submit" value="Scan TCP ports" name="scan_tcp_ports">

                                                  </td>

                                        </tr>

                                        <tr>

                                                  <td align="center">

                                                            <input type="submit" value="Scan common service ports" name="scan_common_tcp"><br>

                                                            <input type="submit" value="Scan common Trojan ports" name="scan_common_trojan_tcp">

                                                  </td>

                                        </tr>

                              </table>

                    </form>

              <script type="text/javascript">

                              function displayMessage()

                              {

                                                  if(document.my_form.uri.value==0)

                                                  {

                                                            document.write("<font color='red'><i>Please enter URL/Domain Name/IP Address.</i></font>");

                                                            return false;

                                                  }

                                                  document.write("<DIV id='loading'><BR><BR><font color='#FF6600'><i>Please wait... The ports are being scanned...</i></font></DIV>");

                                                  document.getElementById("my_form").submit();

                              }

                        window.onload=function()

                              { 

                                        document.getElementById("loading").style.display="none"; 

                        } 

                    </script>

          </body>

</html>

I want to submit above form. But it shows me JavaScript error in Console that

"TypeError: document.getelementbyid(...) is null"

This error is for code :

document.getElementById("my_form").submit();

I am using Firefox 24.0 and Windows 7. I have installed only 1 add-on. That is 'Firebug 1.12.3'.

This code works fine for other browsers Except Firefox.

Please help me to solve this problem.

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LEGEND ,
Oct 13, 2013 Oct 13, 2013

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Is this in any way related to an Adobe product?  If so, please post in the relevant product forum.

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New Here ,
Oct 13, 2013 Oct 13, 2013

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No. This isn't related to any Adobe product.

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Adobe Community Professional ,
Oct 13, 2013 Oct 13, 2013

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If your problem is with firefox, you probably need a firefox forum

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