How can I pass a variable from PHP to javascript

Question

I have a php page with

<?php echo $_SERVER['DOCUMENT_ROOT']?>

Then my javascript is

var data = "Not Set";
$.get("test.php",function(returnData,requestStatus,requestObject){
    data = returnData;
    alert(data);
});

If I navigate directly to the php page on the site, it displays the data that I need. I just can't seem to get the data into my javascript.

Am I on the right track and if so where am I going wrong? Or is there an easier way to get the full filepath when working with a server? Currently if I run document.location.href in my javascript it returns .

http ://127.0.0.1/etc

There is a similar [question](http://stackoverflow.com/questions/168214/pass-a-php-string-to-a-javascript-variable-and-escape-newlines), without Ajax. — BlitZ, May 07 '13 at 11:46

Shail · Answer 1 · 2013-05-07T16:13:38.630

2

The code below will work on ".php" file. NOT ON ".html" file.

You can use the php variable with echo in javascript. For example

alert('<?=$phpvariable?>');

or

alert('<?php echo $phpvariable ?>');

edited May 07 '13 at 16:13

answered May 07 '13 at 11:42

Shail

1,565
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alert is just example. so you can understand how to use php variable – Shail May 07 '13 at 11:43
so can I do `alert('');` – xRuhRohx May 07 '13 at 11:47
When I use this method, it break my js. – xRuhRohx May 07 '13 at 12:02
Try Firefox and see in Developer->Error Console. What error you are getting ? – Shail May 07 '13 at 12:04
SyntaxError: missing ) after argument list – xRuhRohx May 07 '13 at 12:09
try alert(""); Use double quote for alert instead of single quote,since you are already using single quote in php variable. :) – Shail May 07 '13 at 12:14
When I use double quotes, the alert box pops up but it says `` – xRuhRohx May 07 '13 at 12:29
use alert(""); echo statement ends with semicolon – Vaishu May 07 '13 at 12:31
same situation jey. it just displays `` in the alert box – xRuhRohx May 07 '13 at 12:33
Could I be having issues because my javascript is not embedded in my HTML and is a separate file? – xRuhRohx May 07 '13 at 12:36
use – Vaishu May 07 '13 at 12:40
Its not feasible to have my script inside the html. – xRuhRohx May 07 '13 at 12:42
What is your file extension. php or html ? – Shail May 07 '13 at 13:12
I have a crap load of .html files and a .js file (where i am trying to get the php variable into) and a .php file. – xRuhRohx May 07 '13 at 13:18
HAhA, This will never work. PHP don't work on html files. Save the file as php(Offcourse you need to have php installed for that) – Shail May 07 '13 at 16:11

score 0 · Answer 2 · answered May 07 '13 at 11:42

0

It seems you are overthinking this. There is hardly any need to use ajax, but of course you can and just append() the data from the ajax call to your $('body') and jquery will automatically execute things inside a <script> tag.

var serverRoot = '<?php echo $_SERVER['DOCUMENT_ROOT']?>';

answered May 07 '13 at 11:42

Gung Foo

13,392
5
31
39

This did not work for me either. I even tried other variations of single quotes and double quotes. – xRuhRohx May 07 '13 at 12:34

score 0 · Answer 3 · answered May 07 '13 at 11:46

Try following

Instead of GET send $.post request and file don't return any thing just write

$.post("Requestedfile.php",
{ 
    data :data
},
function(data) {
    if(data == false)
    {
      //do something
    }
    else
    {
      //do somthing 
    }
}
);

How can I pass a variable from PHP to javascript

3 Answers3