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[javascript] confirm button on php page

I created a php page with a button and some extra functionality:

PHP Code:




echo "------------<br><br>"; 
echo "<form method='POST' action='function_extract.php'>"; 
echo "Reinstall: </td><td>"; 
 
echo "<select class='dropdown' name='tarball'>"; 
 
exec ("cd /control-panel/ | ls $mm3*-server.tar.gz", $tarlijst); 
foreach ($tarlijst as $inhoud) { 
echo "<option value='$inhoud'>$inhoud</option>"; 
} 
 
echo "</select>"; 
echo "<br><br><input type='submit' value='Reinstall' OnClick=\"confirmSubmit()\">"; 
echo "</form>";

Now I want to add a confirmation window before proceeding the next page (form).

I included this code

Code:

<script LANGUAGE="JavaScript">

<!--



function confirmSubmit()

{

var agree=confirm("Are you sure you wish to continue?");

if (agree)

        return true ;

else

        return false ;

}

</script>

But is doesn't seems to work very well.. At least a pop window is displayed but the will always be redirected to the next page. Anyone know exactly how this works?

Try changing:
"echo "<form method='POST' action='function_extract.php'>"; "
to:

Code:

echo "<form onsubmit='return confirmSubmit();' method='POST' action='function_extract.php'>";

and "echo "<br><br><input type='submit' value='Reinstall' onClick=\"confirmSubmit()\">";"
to:

Code:

echo "<br><br><input type='submit' value='Reinstall'>";

This works for me with javascript form validation, before sending the form contents back to the php server