Preventing Multiple Submissions on the Client Side : Form Post « Form « PHP

Preventing Multiple Submissions on the Client Side

<script language="javascript" type="text/javascript"> 
function checkandsubmit() { 
  document.test.submitbut.disabled = true; 
<form action="index.php" method="post" name="test" onsubmit="return checkandsubmit ()">
<input type="hidden" name="submitted" value="yes" /> Your Name: <input
  type="text" name="yourname" maxlength="150" />
<input type="submit" value="Submit" id="submitbut" name"submitbut" /></form>
if ($file = fopen ( "test.txt", "w+" )) {
  fwrite ( $file, "Processing" );
} else {
  echo "Error opening file.";
echo $_POST ['yourname'];


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7.Preventing Multiple Submissions on the Server Side