so in my php I have something like this
$_SESSION['opened'] = true;
But It will not be set to true until user will perform some actions with some other html\php pages
So I need on some Ajax function to be able get this session variable. And some PHP sample of function to get variable in form ready for Ajax to get it.
so I need something to AJAX requesting to an action (to some simple php code) which will return a value from $_SESSION.
How to do such thing?
Simple jQuery example:
var session;
$.ajaxSetup({cache: false})
$.get('getsession.php', function (data) {
session = data;
});
And getsession.php:
<?php
session_start();
print json_encode($_SESSION);
You're not required to use jQuery for AJAX, but I highly recommend it.
Edit:
In response to:
I want to be able to tell my JS function what variable I want to get.
You can try this (untested):
var session;
$.ajaxSetup({cache: false})
$.get('getsession.php', {requested: 'foo'}, function (data) {
session = data;
});
And the PHP:
<?php
session_start();
if (isset($_GET['requested'])) {
// return requested value
print $_SESSION[$_GET['requested']];
} else {
// nothing requested, so return all values
print json_encode($_SESSION);
}
Have a look at the $.get documentation for a more detailed overview.
$.get syntax without worrying about it caching.
PHP File at http://my.host/response.php
<?php
session_start();
if(isset($_SESSION['opened']))
echo "true";
?>
Then in HTML, Add jQuery such as:
<script type="text/javascript" src="/path/to/jQuery-x.y.z.js"></script>
Then:
<script type="text/javascript">
$(document).ready(function(){
$.ajax({
url:'/response.php',
cache:false,
success:function(data){
// Do something with the result
if(data=="true"){
$('#mydiv').show();
}else{
$('#mydiv').hide();
}
}
);
});
</script>
And add to myform.php:
<h1>Some Random HTML</h1>
<div id='mydiv' class="<?php if(isset($_SESSION['opened']) && $_SESSION['opened']) echo "hidden_class";?>">
...</div>
As this will give a consistent experience to those without JavaScript. You don't have to be showing/hiding a div. You could do anything really.
session_start() to initialize the session data.