JS and PHP value passing issue

Question

<?php
for ($i=1; $i <10 ; $i++) {
$A='A'.$i; 
echo "<button onclick='selectSeat(id)' id='$A'>".$A."</button>";
}?>
<script type="text/javascript">
function selectSeat (id)
{
 alert ("Button pressed ".id);
}
</script>

above is my seating map.... i want to check if if seat is reserved or not in DB through php but i don't know how to get it done through java script. i'm using java script to prompt user in if seat is reserved or not.

• tadman: You'll have to make an AJAX call to find out as the seat may have been booked by the time the button's clicked.
• Rizwan: can you provide me some link ? im totaly new to this stuff

Answer 1

I don't know if it's just a typo, but you are using the wrong operator to concatenate strings in javastring:

alert ("Button pressed ".id);

Should be

alert ("Button pressed "+id);

• Rizwan: It worked .. thank you so much.. but how do i check these values db?
• Rizwan: if user selects A1 .. to check if its reserved or not?
• rbock: @Rizwan To do this, I'd recomend using AJAX to call another PHP file to check in your DB. If you want to learn more about AJAX requests, here is a simple tutorial.
• Rizwan: <?php for ($i=1; $i <10 ; $i++) { $Seat='A'.$i; echo "<button onclick='selectSeat(id)' id='$Seat'>".$Seat."</button>"; } ?> <script type="text/javascript"> function selectSeat (id) { var Seat= $('#id'); alert ("Button pressed "+Seat); } </script

Answer 2

One way is to create a hidden input field using PHP with the value you want to send to javascript. Then you can get the value with javascript (either vanilla or jQuery) using $('#hidden-field').val() (for example).