passing variables from php to javascript

Question

I am trying to create a site where someone can create an "item" and the database will store an id and php generates a url for that id. So next time when the person comes back with that url it will remember the person's settings (variables). Now the problem is that in my site javascript need to know these variables.

So what is the best solution for this? passing the variables in the superglobal "GET" or maybe cookies? Or is there a better way to pass these variables to javascript?

dubvfan87 · Accepted Answer · 2011-08-22T00:26:07.100

5

just use php to print some dynamic javascript

<script>
var myVar = "<?php echo json_encode($_COOKIE['somevalue']);?>";
</script>

edited Aug 22 '11 at 00:26

answered Aug 21 '11 at 23:35

dubvfan87

641
5
18

4

You can access cookies from JS directly too. – Furicane Aug 21 '11 at 23:38
3

Unless you're very sure what kind of value is in `some value` you better JSON escape/encode it. – deceze Aug 21 '11 at 23:42
3

I think it would be better to use `` than `""`. – icktoofay Aug 21 '11 at 23:42
I definitely agree about the json_encode. I'll update the answer. Thanks. – dubvfan87 Aug 22 '11 at 00:25
@Furicane Not when HttpOnly cookies are being used. – Ja͢ck Oct 15 '12 at 09:40

score 2 · Answer 2 · answered Aug 21 '11 at 23:43

There are multiple methods for providing the data to the client, such as:

Echo the variables in your javascript, var userid = <?php echo $userid; ?>
JSON'fy your variables and supply them to your javascript via AJAX/jQuery: $.getJSON(url, function(data){ var userid = data.userid; });

I typically utilize JSON as much as possible when trying to present server-side data to the client-side, as it helps to separate the different layers.

passing variables from php to javascript

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