what should i do to give alert box for invalid security code

[rathurosamal]

I am trying to do form validation through javascript and captcha using php.
when i try to alert for ivalid security code, i cant see the alert box. if icode is correct, page is redirecting to the next page.
what should i do to give alert box for invalid security code??
my form code is

Code: Select all
<input type="submit" name="submit" value="submit" onclick="chk();">



chk is a javascript function

Code: Select all
function chk()
{
alert("<?php chk1(); ?>");

}



it is calling a function named chk1. it is php function

Code: Select all
<?php
function chk1()
{

if( $_SESSION['security_code'] == $_POST['security_code'] )
{

echo 'Thank you.code is valid';

header("Location: process.php");

} else {
print "enter correct security code";


} }
?
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Learning software

[Kishore]

you are trying to call server side php using java script which is not correct. if you want to call a server side script from client side, you need to use Ajax and this is a different topic. for you here is the simple example for creating captcha, http://www.codewalkers.com/c/a/Miscellaneous/Creating-a-CAPTCHA-with-PHP/

..
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Kish