How do I pass JavaScript values to Scriptlet in JSP

Question

Can anyone tell me how to pass JavaScript values to Scriptlet in JSP

User · Answer

I can provide two ways   a jsp    lt html gt       lt script language  javascript  type  text javascript  gt          function call                var name    xyz               window location replace  a jsp name   name                  lt  script gt       lt input type  button  value  Get  onclick  call    gt       lt           String name request getParameter  name            if name  null               out println name                   gt   lt  html gt    b jsp    lt script gt      var v  xyz    lt  script gt   lt        String st   lt script gt document writeln v  lt  script gt        out println  value   st      gt

User · Answer

This is for other people landing here  First of all you need a servlet  I used a  POST request  Now in your jsp file you have two ways to do this    The complicated way with AJAX  in case you are new to jsp  You need to do a post with the javascript var that you want to use in you java class and use JSP to call your java function from inside your request     document  ready function         var sendVar    hello           domId   click function  e                                                 ajax               type   post               url         or whatever your url is             data   var     sendVar               success  function                              console log  success      sendVar                                                   lt                          String received  request getParameter  var                           if received    null    received isEmpty                               received    some default value                                                 MyJavaClass processJSvar received                        gt                                                                        The easy way just with JSP    lt form id  myform  method  post  action  http   localhost port index jsp  gt        lt input type  hidden  name  inputName  value     gt                  lt                          String pg   request getParameter  inputName                           if pg    null    pg isEmpty                               pg    some default value                                                 DatasyncMain changeToPage pg                        gt         lt  form gt     Of course in this case you still have to load the input value from JS  so far I haven t figured out another way to load it

User · Answer

You cannot do that but you can do the opposite    In your jsp you can   String name    John Allepe       request setAttribute  CustomerName   name     Access the variable in the js   var name     lt    request getAttribute  CustomerName     gt    alert name

User · Answer

If you are saying you wanna pass javascript value from one jsp to another in javascript then use URLRewriting technique to pass javascript variable to next jsp file and access that in next jsp in request object   Other wise you can t do it

User · Answer

Its not possible as you are expecting  But you can do something like this  Pass the your java script value to the servlet controller  do your processing and then pass this value to the jsp page by putting it into some object s as your requirement  Then you can use this value as you want

User · Answer

Your javascript values are client-side  your scriptlet is running server-side   So if you want to use your javascript variables in a scriptlet  you will need to submit them   To achieve this  either store them in input fields and submit a form  or perform an ajax request   I suggest you look into JQuery for this

User · Answer

I ve interpreted this question as    Can anyone tell me how to pass values for JavaScript for use in a JSP    If that s the case  this HTML file would pass a server-calculated variable to a JavaScript in a JSP    lt html gt       lt body gt           lt script type  text javascript  gt              var serverInfo     lt   getServletContext   getServerInfo    gt                alert  Server information     serverInfo            lt  script gt       lt  body gt   lt  html gt

User · Answer

simple  you can t   JSP is server side  javascript is client side meaning at the time the javascript is evaluated there is no more  jsp code

[java] How do I pass JavaScript values to Scriptlet in JSP?

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