codeigniter trying to access session data from view using javascript

Question

Framework: CodeIgniter 2.0

I am trying access session data setup in model from view.

This is the code I am testing in view:

<script type='text/javascript'>
  function notEmpty(elem, helperMsg){
    var num_records = '$this->session->userdata("number_Of_Records_session")';
    alert(num_records);
    if(elem.value.length > 0){
      alert(helperMsg);
      elem.focus();
      return false;
    }else{
      window.location="/path/";
    }
    return true;
  }
</script>

When I use PHP code I could retrieve the value from session and display it.

<?php 
    $numberOfRecords_session = 
    $this->session->userdata('number_Of_Records_session');
    echo "Num records:".$numberOfRecords_session;
?>

But in javascript this line

var num_records = '$this->session->userdata("number_Of_Records_session")';

print this message in alert box:

$this->session->userdata("number_Of_Records_session")

Any advice to retrieve value in javascript and show it alert box is appreciate.

Answer 1

You cannot access your session (stored on server) from JavaScript (executed on client) So you have to declare a JavaScript variable and define it with PHP Like this you're defining a string :

...
<script>
var sessionValue = "<?php echo $this->session->userdata('number_Of_Records_session');?>";
</script>
...

If you're sure that there is always a number you could remove the " above, which are defining the variable as string.

If you're not sure about the datatype of the sessionValue you should use parseInt(string,radix) :

...
<script>
var sessionValue = parseInt("<?php echo $this->session->userdata('number_Of_Records_session');?>");
if(sessionValue == "NaN") sessionValue = 0;
</script>
...