Javascript Does Not Call File

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 Javascri

Solution 1:

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);

<scriptsrc="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.