Javascript does not call file

Question

I am trying to use the solution called in here: How to keep session alive without reloading page?

Unfortunately I can't get it to work, I have very limited experience with Javascript and jQuery.

This is my index.php

<?php
session_start();   
echo session_id();
$_SESSION['id'] = session_id(); //just so there is a variable within the session
?>

EDIT: added jquery library after comment/answer

<script src="http://code.jquery.com/jquery-latest.min.js" type="text/javascript"></script>

<script>
setInterval(function(){
    $.post('refresh_session.php')‌;
}, 60000);
</script>

And this is the refresh_session.php where I write to a file, so I can test if the file is actually being called.

<?php
session_start();
if (isset($_SESSION['id'])){
$_SESSION['id'] = $_SESSION['id']; // or if you have any algo.
}
$date = new DateTime();
$fp = fopen('data.txt', 'a');
fwrite($fp, $date->format('Y-m-d H:i:s') . " " . session_id() ."\n");
fclose($fp); 
?>

If I call refresh_session.php manually, I see the date showing up in data.txt. If I open up index.php and wait for the data.txt file to change, nothing happens.

What am I missing here?

Normally, PHP sessions require cookies, otherwise PHP can’t identify the session. Are you sure that $.post() is sending cookies? — Manngo
– Manngo, Commented May 7, 2017 at 7:52
any errors in console..?? also wrap your call within $(document).ready(); — RohitS
– RohitS, Commented May 7, 2017 at 7:52
Nothing wrong with your JS/jQuery code, you either are not giving the correct path of refresh_session.php or as @Manngo mentiond. — divy3993
– divy3993, Commented May 7, 2017 at 7:55
@RohitS I am getting an en error in the console "Uncaught SyntaxError: Invalid or unexpected token" wich refers to the $. according to the online Javascript tester. — CurleyBraces
– CurleyBraces, Commented May 7, 2017 at 8:02
@LvS that indicate you are trying to use jquey in your code..$ reffer to document object ...make sure you include jquery — RohitS
– RohitS, Commented May 7, 2017 at 8:03

Sylogista · Accepted Answer · 2017-05-07 07:59:39Z

2

I don't know why, but after copy-paste your javascript code – I've got strange characters in Code Snipped. It can be charset problem. Code looks good, but bracket only looks like bracket. It's not bracket. What it is? I don't know, but look at that what I've got in Code Snipped after pasting your code:

Code will execute if you write it using good charset. Take that working code:

setInterval(function(){
    $.post('refresh_session.php');
    alert("dsa");
}, 5000);

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

By the way – alert is of course only test, you can delete this.

So, the answer is – check your charset.

answered May 7, 2017 at 7:59

Sylogista

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7 Comments

CurleyBraces Over a year ago

Yes! That is it. How did you check this with what tool? I had copied the code from a comment on the thread I had reffered to. Probably that gave me the illegal characters

Sylogista Over a year ago

While writing question or answer (in comment not) you can press leftCtrl+M that shows Code Snipped editor.

CurleyBraces Over a year ago

Cool, this is really something I would never have found out otherwise. Thanks.

RohitS Over a year ago

this is really strange question and answer i have came across..how would somebody answer if he\she wont copy paste the exact code OP has posted...lol

Sylogista Over a year ago

@RohitS In "basic" codeblock (8 spaces) charset problem will be still invisible. Check it – that's true. So, at last, it's possible to copy paste code and think that bracket is... bracket ;)

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