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.

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. — tadman
– tadman, Commented May 19, 2017 at 16:35

rbock · Accepted Answer · 2017-05-19 16:40:32Z

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);

answered May 19, 2017 at 16:40

rbock

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4 Comments

Rizwan Over a year ago

It worked .. thank you so much.. but how do i check these values db?

Rizwan Over a year ago

if user selects A1 .. to check if its reserved or not?

rbock Over a year ago

@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 Over a year ago

<?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

Robert Taussig · Accepted Answer · 2017-05-19 16:36:58Z

0

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).

answered May 19, 2017 at 16:36

Robert Taussig

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