How to save user session in a variable in PHP to be referenced in JavaScript

Question

Case: User clicks on an image

If it is a returning user (user session valid for 30 minutes) navigate to the link of the image
If it is a new user show a pop-up div

I am now showing the pop-up div whenever the image is being clicked. Any advice on how to save the session and refer it as the variable in a JavaScript to perform a function like:

if {
    // user is log in.. do your task here..
} else {
    //user is not log in.. do your task here...
}

EDIT:

<script>
<? if(isset($_SESSION["logged_in"])) {
    echo "var $check=1";
} else {
    echo "var $check=0";
} ?>

function SetMood() {
    if($check==1) {
        // user is log in.. do your task here..
        alert('URL');
    } else {
        //user is not log in.. do your task here...
        document.getElementById('light').style.display='block';
        document.getElementById('fade').style.display='block';
        document.getElementById('fade').scrollIntoView(true);
    }
}
</script>

This is called for the image as:

<a id="register" href = "javascript:void(0)" onclick = "SetMood();" data-fancybox-group="gallery">
    <img src="<cms:show my_image_thumb />" alt="" class="fade">
</a>

The above has no effect and now nothing opens onClick

i guess you can write the javascript automaticly via php and insert the value of the session.. — MadsBjaerge
– MadsBjaerge, Commented Feb 10, 2015 at 13:54
How exactly would I save the session in the JavaScript? Please see edit to the question — Sarah
– Sarah, Commented Feb 10, 2015 at 13:56

David · Accepted Answer · 2015-02-10 13:57:44Z

2

Don't perform the conditional check in client-side code, perform it in server-side code.

Assuming you have JavaScript implementations of what you want to achieve, let's call them these respectively:

navigateToLink();
showPopUp();

Then you'd conditionally emit the code for one or the other depending on a server-side session check. Something like this:

<?php
if ($_SESSION['someValue'] == 'someKnownValue') {
?>
    navigateToLink();
<?php
} else {
?>
    showPopUp();
<?php
}
?>

The idea is that server-side code should determine what the user can or can not do. Anything emitted to client-side code is entirely visible to (and modifiable by) the user.

answered Feb 10, 2015 at 13:57

David

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13 Comments

Sarah Over a year ago

How would I make a call to the php script in the onClick for the image? Since php only responds to get, post etc, will I be setting the value to true?

Pinki Over a year ago

You can't. If you don't have the functions showPopup() and navigateToLink(), you still have to write them.

Sarah Over a year ago

I already have the functions showPopup() and navigateToLink() but I need to make a call to the PHP on image click to show the correct function

David Over a year ago

@Sarah: If you want to invoke server-side logic without a page refresh then that would be an AJAX request. You can have a server-side resource ("page" in PHP, most likely) which responds with data instead of markup, and the client-side code would consume that data.

Pinki Over a year ago

I think you mean an ajax call, you want to call a php script using javascript?

|

Pinki · Accepted Answer · 2015-02-10 13:56:50Z

0

This should help you:

<script>
    var yourValue = '<?php echo $_SESSION['yourSessionValue'] ?>';
    if(yourValue == 'hello') {
        console.log('hide yo kids');
    } else {
        console.log('hide yo wife');
    }
</script>

answered Feb 10, 2015 at 13:56

Pinki

1,0429 silver badges17 bronze badges

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How to save user session in a variable in PHP to be referenced in JavaScript

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