How to access Session variables and set them in javascript

Question

In code-behind I set Session with some data   Session  usedData      sample data     And the question is how can I get the Session value in my example   sample data   in javascript and set Session  usedData   with a new value

User · Answer

This is a cheat  but you can do this  send the value to sever side as a parameter   lt script gt  var myVar    hello  window location href   window location href replace                param     myVar     Send the variable to the server side  lt  script gt    And from the server side  retrieve the parameter  string myVar   Request QueryString  param    Session  SessionName     myVar    hope this helps

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To modify session data from the server after page creation you would need to use AJAX or even JQuery to get the job done  Both of them can make a connection to the server to modify session data and get returned data back from that connection    lt  php session start      SESSION  usedData      Some Value     setting for now since it doesn t exist   gt   lt  DOCTYPE html gt   lt html gt       lt head gt           lt meta http-equiv  Content-Type  content  text html  charset UTF-8  gt           lt title gt Modifying PHP Session Data lt  title gt           lt script type  text javascript  gt              var usedData     lt  php echo   SESSION  usedData      gt                var oldDataValue   null                  If function used  sends new data from input field to the                server  then gets response from server if any                  function modifySession                      var newValue   document getElementById  newValueData   value                      You could always check the newValue here before making                    the request so you know if its set or needs filtered                      var xhttp   window XMLHttpRequest   new XMLHttpRequest     new ActiveXObject  Microsoft XMLHTTP                     xhttp onreadystatechange   function                          if  this readyState    4  amp  amp  this status    200                            oldDataValue   usedData                          usedData   this responseText    response from php script                         document getElementById  sessionValue   innerHTML   usedData                          document getElementById  sessionOldValue   innerHTML   oldDataValue                                                        xhttp open  GET    modifySession php newData   newValue  true               xhttp send                            lt  script gt       lt  head gt       lt body gt           lt h1 gt  lt p gt Modify Session lt  p gt  lt  h1 gt           Current Value   lt div id  sessionValue  style  display inline  gt  lt  php echo   SESSION  usedData      gt  lt  div gt  lt br  gt          Old Value   lt div id  sessionOldValue  style  display inline  gt  lt  php echo   SESSION  usedData      gt  lt  div gt  lt br  gt           New Value   lt input type  text  id  newValueData    gt  lt br  gt           lt button onClick  modifySession    gt Change Value lt  button gt      lt  body gt   lt  html gt    Now we need to make a small php script called modifySession php to make changes to session data and post data back if necessary    lt  php session start      SESSION  usedData       GET  newData      filter if necessary echo   SESSION  usedData       Post results back if necessary   gt    This should achieve the desired results you are looking for by modifying the session via server side using PHP AJAX

User · Answer

You could also set the variable in a property and call it from js   On the Server side    Protected ReadOnly Property wasFieldEditedStatus   As Boolean     Get         Return If  wasFieldEdited    true    false       End Get End Property   And then in the javascript   alert  The wasFieldEdited Value   lt    wasFieldEditedStatus   gt

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You can t access Session directly in JavaScript   You can make a hidden field and pass it to your page and then use JavaScript to retrieve the object via document getElementById

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i used my  php file to put required into sessions       SESSION  name      phparray  name     ajaxoutput  name     phparray  name      in my  js file i used      sessionStorage setItem  name   ajaxreturnedarray  name       and i retrieved this using     var myName  sessionStorage getItem  name      in other  js files or in same  js files  if i keep it as it is   it will return same at all times even you loggedout  so while logging out i made     sessionStorage setItem  name          using this i emptied local variable  i used this process in single page website login logout sessions  i hope this way will work for you because it worked for me  plz let me know your experiences

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lt  php     session start          SESSION  mydata    quot some text quot     gt    lt script gt      var myfirstdata  quot  lt  php echo   SESSION  mydata     gt  quot    lt  script gt

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Accessing  amp  Assigning the Session Variable using Javascript   Assigning the ASP NET Session Variable using Javascript     lt script type  text javascript  gt  function SetUserName         var userName    Shekhar Shete         lt  Session  UserName          userName         gt         alert   lt   Session  UserName     gt        lt  script gt    Accessing ASP NET Session variable using Javascript    lt script type  text javascript  gt      function GetUserName                  var username     lt    Session  UserName     gt            alert username           lt  script gt

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If you want read Session value in javascript This code help for you    lt script type  text javascript  gt   var userID   Session  userID      lt  script gt

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I was looking for solution to this problem  until i found a very simple solution for accessing the session variables  assuming you use a  php file on server side  Hope it answers part of the question    access session value   lt script type  text javascript  gt              var value    lt  php echo   SESSION  key      gt       console log value    lt  script gt    Edit   better example below  which you can try on phpfiddle org  at the  codespace  tab   lt  DOCTYPE html gt   lt html gt    lt head gt     lt meta http-equiv  Content-Type  content  text html  charset UTF-8  gt     lt  php       SESSION  key     10       i     SESSION  key        gt    lt  head gt    lt body gt     lt p id  affichage  gt hello lt  p gt      lt script type  text javascript  gt      var value     lt  php echo  i    gt           affichage   html value         lt  script gt     lt  body gt   lt  html gt    set session value  pass it a variable of whatever  you may want to  eg    you   13    SESSION  user id      you    This should work  tho  not tested it

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Try This  var sessionValue     lt   Session  usedData    gt

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Here is what worked for me  Javascript has this    lt script type  text javascript  gt  var deptname        lt  script gt    C  Code behind has this - it could be put on the master page so it reset var on ever page change           String csname1    LoadScript           Type cstype   p GetType                Get a ClientScriptManager reference from the Page class          ClientScriptManager cs   p ClientScript              Check to see if the startup script is already registered          if   cs IsStartupScriptRegistered cstype  csname1                         String cstext1   funct              cs RegisterStartupScript cstype  csname1   deptname    accounting    true                     else                       String cstext   funct              cs RegisterClientScriptBlock cstype  csname1   deptname   accounting   true               Add this code to a button click to confirm deptname changed   alert deptname

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Assign value to a hidden field in the code-behind file  Access this value in your javascript like a normal HTML control

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Javascript can not directly set session values  For setting session values from javascript I do ajax call as follows   Check Online  At ASPx file or html     lt script type  text javascript  gt     function         Getting values from session and saving in javascript variable        But this will be executed only at document ready     var firstName     lt    Session  FirstName           gt       var lastName     lt    Session  LastName           gt            FirstName   val firstName          LastName   val lastName          Button   click function           Posting values to save in session        post document URL   mode ajax           FirstName      FirstName   val          LastName      LastName   val                            At Server side   protected void Page Load object sender  EventArgs e           if Request QueryString  mode      null  amp  amp  Request QueryString  mode       ajax                     Saving the variables in session  Variables are posted by ajax          Session  FirstName     Request Form  FirstName                  Session  LastName     Request Form  LastName                       For getting session values  as said by Shekhar and Rajeev  var firstName     lt    Session  FirstName           gt      Hope this helps

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Possibly some mileage with this approach  This seems to get the date back to a session variable  The string it returns displays the javascript date but when I try to manipulate the string it displays the javascript code  ob start      gt   lt script type  quot text javascript quot  gt      var d   new Date        document write d    lt  script gt   lt     SESSION  quot date quot      ob get contents    ob end clean    echo   SESSION  quot date quot       displays the date echo substr   SESSION  quot date quot   28       displays  script quot  gt  var d   new Date    document write d

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Assuming you mean  client side JavaScript  - then you can t  at least not directly   The session data is stored on the server  so client side code can t see it without communicating with the server   To access it you must make an HTTP request and have a server side program modify   read  amp  return the data

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first create a method in code behind to set session     System Web Services WebMethod   public static void SetSession int id          Page objp   new Page         objp Session  IdBalanceSheet     id       then call it from client side    function ChangeSession values         PageMethods SetSession values            you should set EnablePageMethods to true    lt asp ScriptManager EnablePageMethods  true  ID  MainSM  runat  server  ScriptMode  Release  LoadScriptsBeforeUI  true  gt  lt  asp ScriptManager gt

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I was able to solve a similar problem with simple URL parameters and auto refresh   You can get the values from the URL parameters  do whatever you want with them and simply refresh the page   HTML    lt a href   webpage aspx parameterName parameterValue  gt  LinkText  lt  a gt    C    string variable   Request QueryString  parameterName    if  parameterName   null       Session  sessionVariable      parameterName     Response AddHeader  REFRESH    1 URL webpage aspx

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You can t set session side session variables from Javascript  If you want to do this you need to create an AJAX POST to update this on the server though if the selection of a car is a major event it might just be easier to POST this

[javascript] How to access Session variables and set them in javascript?

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