Prevent Multiple Submissions on the Client Side in PHP
Description
The following code shows how to prevent Multiple Submissions on the Client Side.
Example
//www . java 2s. c o m
<html>
<script language="javascript" type="text/javascript">
function checkandsubmit() {
document.test.submitbut.disabled = true;
document.test.submit();
}
</script>
<body>
<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>
</body>
</html>
<?php
if ($file = fopen ( "test.txt", "w+" )) {
fwrite ( $file, "Processing" );
} else {
echo "Error opening file.";
}
echo $_POST ['yourname'];
?>