How to concatenate PHP variable with JavaScript Variable? Is it possible? [duplicate]

Question

Java Script Code:

<script type="text/javascript">
        $(function () {
         var  seatNo = 2;                                                       
         str.push('<a title="' + seatNo + '">' + '<?php echo $thisPacket["seat"]; ?>'</a>');
         }); 
</script>

I want to concatenate between $thisPacket["seat"] with java Script variable seatNo.
Just like php concate. example: $i = 1; $thisPacket["seat".$i];

possible duplicate of how to put javascript variable in php echo or Access a JavaScript variable from PHP or of you meant otherwise echoing PHP into jS see Pass a PHP string to a Javascript variable (and escape newlines) — metadings
– metadings, Commented Jul 25, 2013 at 6:35
This is a common misconception for novices because Javascript code and PHP code can co-exist in the same file. However, PHP executes before HTML and Javascript is sent to the browser. Therefore you can't use Javascript variables in a PHP variable. You can use the result of PHP variables in Javascript variables however. — Herbert
– Herbert, Commented Jul 25, 2013 at 7:05

Hein Andre Grønnestad · Accepted Answer · 2013-07-25 06:35:08Z

1

I want to concatenate between $thisPacket["seat"] with java Script variable seatNo. Just like php concate. example: $i = 1; $thisPacket["seat".$i];

No, this won't work because the PHP code runs on the server, and the javascript variable seatNo is not available until the javascript code executes on the client.

answered Jul 25, 2013 at 6:35

Hein Andre Grønnestad

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Comments

Mohammad Ismail Khan · Accepted Answer · 2013-07-25 06:44:38Z

1

take you php variable and assign it to javascript variable than concatenate them.

var phpVar = '<?php echo $thisPacket["seat"]; ?>';
var seatNo =  2;
var conVar = seatNo + phpVar;

I hope this will work

answered Jul 25, 2013 at 6:44

Mohammad Ismail Khan

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Comments

EJTH · Accepted Answer · 2013-07-25 06:45:26Z

1

Your best bet is to serialize $thisPacket as a JSON object and send that to the client:

<script type="text/javascript">
        var thePacket = <?=json_encode($thisPacket);?>;
        $(function () {
        var  seatNo = 2;                                                       
            str.push('<a title="' + seatNo + '">' + thePacket['seat'+seatNo] + '</a>');
         }); 
</script>

But im guessing that you should really reconsider your current design.

answered Jul 25, 2013 at 6:45

EJTH

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Comments

frogatto · Accepted Answer · 2016-08-28 07:21:57Z

0

No this is impossible, because JavaScript is a client-side language and will be executed after that all PHP commands was executed in the server and the page completely rendered. But PHP is a server-side language and is execued before any JavaScript code is interpreted.

edited Aug 28, 2016 at 7:21

answered Jul 25, 2013 at 6:30

frogatto

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5 Comments

vladkras Over a year ago

So displaying HTML is also not possible, because HTML is client-side, and PHP server-side

frogatto Over a year ago

@vladkras: No, The main duty of PHP is HTML Rendering and HTTP Handling, So PHP can manipulate html when it is rendering a page

vladkras Over a year ago

the main duty is to be general-purpose scripting language that is especially suited to web development you can render JS as well and even generate it on fly

frogatto Over a year ago

@vladkras: At this step you're right, But i think you did not read my answer carefully, My mean in this answer is Access to content of JS variables is impossible while PHP is rendering, Okay?

Herbert Over a year ago

I get what you're saying. I think @vladkras had a problem with how you said it. :)

freshp · Accepted Answer · 2013-07-25 06:28:52Z

-1

this should work

<script type="text/javascript">
        $(function () {
        var  seatNo = 2;                                                       
            str.push('<a title="' + seatNo + '"><?php echo $thisPacket["seat"]; ?></a>');
         }); 
</script>

answered Jul 25, 2013 at 6:28

freshp

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2 Comments

sami Over a year ago

Yes, I know, but my problem is, I want to concatenate between $thisPacket["seat"] with java Script variable seatNo. Just like php concate. example: $i = 1; $thisPacket["seat".$i];

freshp Over a year ago

You only can concatenate a javascript variable with a php variable, but in the other direction it is impossible.

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