Capture PHP echo in Javascript

Question

I currently need to use a similar piece of PHP code. Modifying this code is not an option.

<?
session_start();

include '../connection.inc';

$conn = new Connection();

echo "ID:" . $conn->generateID();
echo "\n";
?>

In connection.inc a connection to a database can be made by creating a new Connection(). From there, the database can generate a unique 16-character ID (conn->generateID). Is there a way to retrieve to execute this PHP-file from javascript and extract the 16-character ID from the PHP-echo in javascript?

You couuld also print in a script bloc the value if your page is dynamic — kingdomcreation
– kingdomcreation, Commented Mar 6, 2013 at 16:04
Robert is correct. And AJAX call is your most viable solution. Though, why don't you just 'include' this file where you need it and use the variable yourself? Oh wait, because you don't want the echo to show up, right? — Refugnic Eternium
– Refugnic Eternium, Commented Mar 6, 2013 at 16:04

Refugnic Eternium · Accepted Answer · 2013-03-06 16:10:01Z

2

There's an alternative to the AJAX call, though it's a little...unusual. Output Buffering.

A little example:

<?php
    ob_start();  //This will stop all echoed output from being sent immediately.
    include("Whereveryourcodeis.php");
    ob_end_clean();  //Discards what has been stored and stops buffering.
?>

After this fragment, you can use $conn->generateID wherever on your page you want, without having written a single line of JavaScript.

I hope this helps a little.

answered Mar 6, 2013 at 16:10

Refugnic Eternium

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2 Comments

user1781710 Over a year ago

when I wrote my answer I actually thought of this but then thought nnnaaaah it's too complex. But you are right 100% on this!

user1879060 Over a year ago

I was already using this solution, but it didn't work with a header() function I needed to send later. Right after posting my question, I found ob_get_contents(). Problem solved. Thanks for your help!

user1781710 · Accepted Answer · 2013-03-06 16:03:54Z

0

You should make a call to this handler by using jQuery AJAX and specifying that PHP should return the result and what exactly AJAX should be doing on a successful completion of the AJAX call.

See here:

http://api.jquery.com/jQuery.ajax/

answered Mar 6, 2013 at 16:03

user1781710

2 Comments

user1879060 Over a year ago

I wasn't familiar with AJAX until now. But it works fine indeed. Thanks for offering this solution!

user1781710 Over a year ago

@user1879060: My pleasure. That's why I do open source development and not that .NET crap. All about making better, cleaner code. If you need help in the future you can always hit me up.

Ayman Safadi · Accepted Answer · 2013-03-06 16:04:48Z

0

Try something like:

<script type="text/javascript">
var dbId = '<?= $conn->generateID(); ?>';
</script>

answered Mar 6, 2013 at 16:04

Ayman Safadi

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Comments

kingdomcreation · Accepted Answer · 2013-03-06 16:05:44Z

0

<?php

session_start();

include '../connection.inc';

$conn = new Connection();

?>

Then below:

<script type="text/javascript">
var bd_id = '<?php echo $conn->generateID(); ?>';


// JUST TO TEST THAT THE ID IS AVALAIBLE IB JAVASCRIPT
alert(db_id); 
</script>

answered Mar 6, 2013 at 16:05

kingdomcreation

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3 Comments

Refugnic Eternium Over a year ago

This by itself won't help him I believe.

kingdomcreation Over a year ago

@RefugnicEternium do you find this may improve understanding?

Refugnic Eternium Over a year ago

Well, the thing is, he said that he must not alter the code...which is what you did, by removing the echoes.

eb80 · Accepted Answer · 2013-03-06 16:10:57Z

0

Create a JavaScript file that makes an AJAX query to a wrapper PHP file, which calls connection.inc
Within JavaScript, call the AJAX query and parse the response, which will give you the ID

Finally, you should probably use HTTPS for this.

answered Mar 6, 2013 at 16:10

eb80

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Comments

Vestimir Markov · Accepted Answer · 2013-03-06 16:13:12Z

0

Try something like this

<?php
session_start();

include '../connection.inc';

$conn = new Connection();

print json_encode(array('ID' => $conn->generateID()));

Or if you can't change the above code just load the php response (with ajax call) into js variable and use regular expression to match the ID. Something like:

$.get('url/to/php', function (resp) {
    var matches = resp.match(/ID:(.*)\n/);
    console.log(matches);
})

matches[1] will hold the ID string.

answered Mar 6, 2013 at 16:13

Vestimir Markov

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