php - Appending the contents of a UNIX command to a div tag -

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i'm making unix web-based terminal learning purposes. far have made text box , output being displayed. sort of this.

<?php $output = shell_exec('ls'); echo "<pre>$output</pre>"; ?>

form

<html> <head> <link href="/css/webterminal.css" rel="stylesheet" type="text/css" /> <script type="text/javascript"> function shell_execute(str) { if (str.length==0)   {   document.getelementbyid("txtout").innerhtml="";   return;   } if (window.xmlhttprequest)   {// code ie7+, firefox, chrome, opera, safari   xmlhttp=new xmlhttprequest();   } else   {// code ie6, ie5   xmlhttp=new activexobject("microsoft.xmlhttp");   } xmlhttp.onreadystatechange=function()   {   if (xmlhttp.readystate==4 && xmlhttp.status==200)     {     document.getelementbyid("txtout").innerhtml=xmlhttp.responsetext;     }   } xmlhttp.open("get","exec.php?q="+str,true); xmlhttp.send(); } </script> </head <body onload="setuser();">     <div class="container">      <h2>unix web based terminal 1.0</h2>         <br />     <p><b>output</b></p> <form> <span id="user"></span>< <input type="text" class="textbox" onkeyup="shell_execute(this.value)" size="20" /> </form> <div class="output"> <p><span id="txtout"></span></p>      </div> </div> </body> </html>

but want if page terminal. when type command, should store result of shell command, , append div tag. typing in commands, keep on showing output. in unix terminal.

how can append output of commands div tag?

change:

document.getelementbyid("txtout").innerhtml=xmlhttp.responsetext;

to:

document.getelementbyid("txtout").innerhtml += xmlhttp.responsetext;

on sidenote, why not using of established javascript frameworks?

with jquery example reduce code maybe 4 lines.

edit - using jquery: http://api.jquery.com/jquery.ajax/

<html>     <head>         <link href="/css/webterminal.css" rel="stylesheet" type="text/css" />         <script type="text/javascript" src="http://code.jquery.com/jquery-1.5.2.min.js"></script>         <script type="text/javascript">             $(function () {                 $('#cmd').bind('keydown', function (evt) {                     if (evt.keycode === 13) { // enter key                         var cmdstr = $(this).val();                          $.ajax({                             url: 'exec.php',                             datatype: 'text',                             data: {                                 q: cmdstr                             },                             success: function (response) {                                 $('#txtout').append(response);                             }                         });                     }                 });             });         </script>     </head>      <body>         <div class="container">             <h2>unix web based terminal 1.0</h2>             <br />             <p><b>output</b></p>              <span id="user"></span>             <input id="cmd" type="text" class="textbox" size="20" />              <div class="output">                 <p><span id="txtout"></span></p>             </div>         </div>     </body> </html>

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