How to access PHP session variables from jQuery function in a js file

Question

How to access PHP session variables from jQuery function in a  js file  In this code  I want to get  value  from a session variable    function            progressbar   progressbar         value  37

User · Answer

This is strictly not speaking using jQuery, but I have found this method easier than using jQuery. There are probably endless methods of achieving this and many clever ones here, but not all have worked for me. However the following method has always worked and I am passing it one in case it helps someone else.

Three javascript libraries are required, createCookie, readCookie and eraseCookie. These libraries are not mine but I began using them about 5 years ago and don't know their origin.

createCookie = function(name, value, days) {
if (days) {
    var date = new Date();
    date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
    var expires = "; expires=" + date.toGMTString();
}
else var expires = "";

document.cookie = name + "=" + value + expires + "; path=/";
}

readCookie = function (name) {
var nameEQ = name + "=";
var ca = document.cookie.split(';');
for (var i = 0; i < ca.length; i++) {
    var c = ca[i];
    while (c.charAt(0) == ' ') c = c.substring(1, c.length);
    if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length, c.length);
}
return null;
}
eraseCookie = function (name) {
   createCookie(name, "", -1);
}

To call them you need to create a small PHP function, normally as part of your support library, as follows:

<?php
 function createjavaScriptCookie($sessionVarible) {
 $s =  "<script>";
 $s = $s.'createCookie('. '"'. $sessionVarible                 
 .'",'.'"'.$_SESSION[$sessionVarible].'"'. ',"1"'.')';
 $s = $s."</script>";
 echo $s;
}
?>

So to use all you now have to include within your index.php file is

$_SESSION["video_dir"] = "/video_dir/";
createjavaScriptCookie("video_dir");

Now in your javascript library.js you can recover the cookie with the following code:

var videoPath = readCookie("video_dir") +'/'+ video_ID + '.mp4';

I hope this helps.

User · Answer

If you want to maintain a clearer separation of PHP and JS  it makes syntax highlighting and checking in IDEs easier  then you can create jquery plugins for your code and then pass the   SESSION  param   as a variable   So in page php    lt script src  my progress bar js  gt  lt  script gt   lt script gt    function          var percent    lt  php echo   SESSION  percent      gt         my progress bar percent        lt  script gt    Then in my progress bar js    function             my progress bar   function percent                 progressbar    progressbar               value  percent                       jQuery

User · Answer

You cant access PHP session variables values in JS  one is server side  PHP   the other client side  JS    What you can do is pass or return the SESSION value to your JS  by say  an AJAX call  In your JS  make a call to a PHP script which simply outputs for return to your JS the SESSION variable s value  then use your JS to handle this returned information   Alternatively store the value in a COOKIE  which can be accessed by either framework  though this may not be the best approach in your situation   OR you can generate some JS in your PHP which returns sets the variable  i e     lt   php echo   lt script type  text javascript  gt      alert    json encode   SESSION  msg          lt  script gt      gt

User · Answer

I was struggling with the same problem and stumbled upon this page  Another solution I came up with would be this    In your html  echo the session variable  mine here is   SESSION  origin    to any element of your choosing    lt p id  sessionOrigin  gt  lt     SESSION  origin     gt  lt  p gt   In your js  using jQuery you can access it like so       sessionOrigin   text     EDIT  or even better  put it in a hidden input      lt input type  hidden  name  theOrigin  value   lt     SESSION  origin     gt   gt  lt  input gt

User · Answer

You can produce the javascript file via PHP  Nothing says a javascript file must have a  js extention  For example in your HTML    lt script src  javascript php  gt  lt  script gt    Then your script file    lt  php header  Content-type  application javascript      gt     function              progressbar    progressbar           value   lt  php echo   SESSION  value     gt                      more javascript       If this particular method isn t an option  you could put an AJAX request in your javascript file  and have the data returned as JSON from the server side script

User · Answer

You can pass you session variables from your php script to JQUERY using JSON such as   JS   jQuery   rowed2   jqGrid       url  yourphp php q 3        datatype   json        colNames   Actions         colModel                    name  Actions                   index  Actions                    width 155                  sortable false                        rowNum 30       rowList  50 100 150 200 300 400 500 600        pager    prowed2        sortname   id       height  660              viewrecords  true       sortorder   desc       gridview true      editurl   yourphp php        caption   Caption        gridComplete  function              var ids   jQuery   rowed2   jqGrid  getDataIDs             for  var i   0  i  lt  ids length  i                   var cl   ids i                be     lt input style  height 22px width 50px    enter code here  type  button  value  Edit  onclick   jQuery   rowed2   editRow    cl          gt                 se     lt input style  height 22px width 50px   type  button  value  Save  onclick   jQuery   rowed2   saveRow    cl          gt                 ce     lt input style  height 22px width 50px   type  button  value  Cancel  onclick   jQuery   rowed2   restoreRow    cl          gt                 jQuery   rowed2   jqGrid  setRowData   ids i    Actions be se ce                             PHP     start your session session start        get session from database or create you own  session username     SESSION  John     session email     SESSION  johndoe jd com      response   new stdClass     response- gt session username    session username   response- gt session email    session email    i   0  while   row   mysqli fetch array  result           response- gt rows  i   id      row  ID          response- gt rows  i   cell     array      row  rowvariable1     row  rowvariable2           i         echo json encode  response      this response  which contains your Session variables  is sent back to your JQUERY

User · Answer

Strangely importing directly from   SESSION not working but have to do this to make it work     lt  php  phpVar     SESSION  var      gt    lt script gt      var variableValue    lt  php echo  phpVar    gt        var imported   document createElement  script        imported src      your path to js       document head appendChild imported    lt  script gt    and in to js    document  ready function    alert variableValue      rest of js file

[php] How to access PHP session variables from jQuery function in a .js file?

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