Hi,

i was wondering if anyone can help me. i am new to php and was wondering if it was possible to embed javascript in php. i was trying to get an alert/msg box up to explain an error to the user.

i have written the following code


<?php
.............


/* CHECK IF EMAIL ADDRESS SUBMITTED IS VALID */

if(!ereg("^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$", $UNameFrm))
{
<script type = "text/javascript">
alert('Congrats');
</script>

exit();
}

/* CHECK IF EMAIL ADDRESS ALREADY EXISTS IN THE DATABASE */

$check = mysql_query("select * from acctbl where Username = '$UNameFrm'");

$result = mysql_query($check);

$num = mysql_num_rows($check);

if ($num > 0)
{
echo "This email address already exists";
exit();
}

else
{
$insert = ......
}
?>

can anybody help me? if this can't be done with javascript can anybody tell me how to do it another way.

Thanks in Advanced,

Scoobie.

Hi Scoobie:

It is very easy to embed Javascript in PHP. Remember that PHP code is executed on the server while JavaScript is executed by your browser. This means that javascript, like HTML, simply needs to be printed from PHP.

Below I've placed two examples of how you can change your PHP code to output the JavaScript pop-up.

Example 1:
----------------------------------------------------------------
if(!ereg("^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$",$UNameFrm))
{
?>

<script language = 'javascript'>
alert('Congrats');
</script>

<?
exit();
}


Example 2:
----------------------------------------------------------------
if(!ereg("^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3})$", $UNameFrm))
{
print("<script language = 'javascript'>alert('Congrats');</script>");

exit();
}

Please note that I've changed the "type = 'text/javascript'" to "language = 'javascript'" in both examples.

PHP and JavaScript work very well togehter. However, it's very easy to write a very confusing piece of code since their syntax is nearly identicle!

Good luck!

hise

Hi,

i tried both of your examples but it didn't work. my php script stopped working altogether and i am presented with a blank white screen

Scoobie

Hi,

i got it to work. i used the following code:

echo "<script type='text/javascript'>\n";
echo "alert('Congrats');\n";
echo "</script>";

the problem i have now is that it presents a blank white screen, how can i get it to go back to the screen so that they can reenter the info after they click ok on the alert msg box

scoobie

you can use

header("Location: filename.php");

to send the person back to the form