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How to populate an html table with javascript form elements?


Your HTML had some typos and other problems. Your JavaScript was on the right track, but overly complicated (and generally it is good practice to put all of it in the head section of the HTML). Here is a workable test-page:

<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8" />
  <title>Test Page</title>

  <script type="text/javascript"> <!--

 var tabBody, row, cell;
 function updateTable(){
     tabBody=document.getElementById("editable");
     row=document.createElement("tr");
     cell = document.createElement("td");
    
cell.innerHTML=document.forms['leds'].elements[3].value;
     row.appendChild(cell);
     if(tabBody.childNodes.length==10)
       tabBody.removeChild(tabBody.childNodes[0])
     tabBody.appendChild(row);
 }

  // -->
  </script>
</head>
<body>

<h2>Change Our Lights:</h2>
<!-- <form name="leds" id="ledSend"
method="get" target="_blank"
action="https://agent.electricimp.com/Fk43xPMkSrWF">
-->
<form name="leds" id="ledSend" action=""
onsubmit="return false;">
Lamp Control: <input type="radio" name="led"
value="0" checked />Off
              <input type="radio" name="led"
value="1" />On<br>
How long should the Lights stay on? <input
type="text" name="timer" value="10"
/>seconds<br>
Your name? For Our Records <input id="name"
type="text" name="user" placeholder="Your name
here" /><br>
<br>
<input type="submit" value="Update!"
onclick="updateTable();return false;"/>
</form>

<h1>Who has Changed Our Lights?</h1>

<table border='1'>
<thead><tr><th>This Could Be
You</th></tr></thead>
<tbody id="editable"></tbody>
</table>

</body>
</html>

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