How to get value from php javascript?

Question

I have a file php javascript

in news.js

news_id  = 1;
document.write('<div id="news-id"></div>');
function output(strHtml) {
    document.getElementById('news-id').innerHTML = strHtml;
}

in news.php is using

<?php
    $news_id = 
?>
news_id
<?php
    $str = '<p>This is id: </p>'.$news_id;
?>    
output(<?php echo json_encode($str); ?>);

And index.html i call

<script src="news.js" type="text/javascript"></script>
<script src="news.php" type="text/javascript"></script>

When i run index.html is error, how to get news_id from js to using in php

script src="news.**php**" type="text/**javascript**" facepalm.jpg — k102
– k102, Commented Mar 29, 2012 at 7:10
You cannot pass a JS variable to a PHP file. The PHP is evaluated on the server side, before it ever hits the client (where the JS variable lives). — Steve
– Steve, Commented Mar 29, 2012 at 7:13
@k102 There is nothing wrong with < script src="news.php" type="text/javascript" > as long as news.php returns javascript code. — Steve
– Steve, Commented Mar 29, 2012 at 7:53
@Steve i think you (and maybe those seven people) understood me correctly ;) — k102
– k102, Commented Mar 29, 2012 at 8:06

Steve · Accepted Answer · 2012-03-29 07:41:36Z

1

Well, as wrong as the original question is, there is a way to get the a JS variable into a PHP file.

In the HTML:

<script src="news.js"></script>
<script>
    document.write('<scr'+'ipt type="text/javascript" src="news.php?myvar='+myvar+'" ></scr'+'ipt>');
</script>

In news.js:

var myvar = "HELLO";

In news.php:

alert("<?php echo $_GET["myvar"]?>");

Again, I highly discourage this approach... but it works.

answered Mar 29, 2012 at 7:41

Steve

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Comments

Ken · Accepted Answer · 2012-03-29 07:16:28Z

1

You can't call news.php like this. It should be included in the html file like this:

include("news.php");

and you should change the extension of your html file to .php

edited Mar 29, 2012 at 7:16

Ken

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answered Mar 29, 2012 at 7:11

bassem ala

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Comments

aifarfa · Accepted Answer · 2012-03-29 07:21:21Z

0

To use PHP as javascript source <script src="news.php"

you need explicit declare content-type in .php

<?php header("Content-type: text/javascript"); //at very first line no white-space before ?>
//this is javascript content..

Important!

first, PHP execute on web server and send response to client(browser).

then javascript execute later in web browser.

To use js value inside php function you need AJAX GET/POST.

answered Mar 29, 2012 at 7:21

aifarfa

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