Using Javascript can you get the value from a session attribute set by servlet in the HTML page

Question

I have a servlet that forwards to a HTML page  using redirect  Because I am using ajax and php on the html page to do other functions  Can turn into a jsp  Is there a way I can get the name - poNumber  I get in servlet in the session attributes  I was to get it and display it s value   I am new to programming   Can get this working in jsp   However need to get this working in a html page  Can I do it with javascript   I have tried          lt script type  text javascript  gt        var purchaseOrderNo   session getAttribrute  pONumb          document write  pONumb           lt  script gt      This does not output any values on the HTML page   Tried           lt script type  text javascript  gt         var purchaseOrderNo    String  session getAttribrute  pONumb               document write  pONumb                lt  script gt     Again get no output on page   Tried                lt script type  text javascript  gt              String purchaseOrderNo    String  session getAttribrute  pONumb                document write  pONumb                 lt  script gt     Again get no output on page   Can not think of any thing else to try  The servlet that redirects to this HTML page creates and set session attribute pONumb

User · Answer

Below code may help you to achieve session attribution inside java script   var name     lt    session getAttribute  username     gt

User · Answer

lt   String session val    String session getAttribute  sessionval     System out println  session val  session val     gt   lt html gt   lt head gt   lt script type  text javascript  gt  var session obj    lt   session val  gt    alert  session obj  session obj    lt  script gt   lt  head gt   lt  html gt

User · Answer

lt  php       sessionDetails    this- gt Session- gt read  Auth User         if   empty  sessionDetails                loginFlag   1            code         else           loginFlag    0            gt    lt script type  text javascript  gt       var sessionValue     lt  php echo  loginFlag    gt        if  sessionValue   0               model show        lt  script gt

User · Answer

No  you can t  JavaScript is executed on the client side  browser   while the session data is stored on the server   However  you can expose session variables for JavaScript in several ways    a hidden input field storing the variable as its value and reading it through the DOM API an HTML5 data attribute which you can read through the DOM storing it as a cookie and accessing it through JavaScript injecting it directly in the JS code  if you have it inline   In JSP you d have something like    lt input type  hidden  name  pONumb  value    sessionScope pONumb    gt    or    lt div id  product  data-prodnumber    sessionScope pONumb     gt    Then in JS      you can find a more efficient way to select the input you want var inputs   document getElementsByTagName  input    len   inputs length  i  pONumb  for  i   0  i  lt  len  i          if  inputs i  name     pONumb             pONumb   inputs i  value          break            or   var product   document getElementById  product    pONumb  pONumb   product getAttribute  data-prodnumber      The inline example is the most straightforward  but if you then want to store your JavaScript code as an external resource  the recommended way  it won t be feasible    lt script gt      var pONumb     sessionScope pONumb              lt  script gt

[javascript] Using Javascript can you get the value from a session attribute set by servlet in the HTML page

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