How can I store JavaScript variable output into a PHP variable

Question

I have the following code in JavaScript    lt script gt  var a  Hello    lt  script gt    PHP Code -   lt  php   variable      I want the above JavaScript variable  a  value to be stored here   gt    Note   I don t want it in a form submission  I have some logic in JavaScript and I want to use it in the same PHP page    Please let me know how I can do this

User · Answer

lt html gt    lt head gt       lt script gt          var a  Hello        lt  script gt    lt  head gt     lt body gt        lt  php          echo  variable     lt script gt document write a  lt  script gt      I want above javascript variable  a  value to be store here       gt   lt  body gt

User · Answer

The ideal method would be to pass it with an AJAX call  but for a quick and dirty method  all you d have to do is reload the page with this variable in a   GET parameter -    lt script gt    var a  Hello     window location href   window location href   a   a   lt  script gt    Your page will reload and now in your PHP  you ll have access to the   GET  a   variable    lt  php     variable     GET  a      gt

User · Answer

You really can t  PHP is generated at the server then sent to the browser  where JS starts to do it s stuff  So  whatever happens in JS on a page  PHP doesn t know because it s already done it s stuff   manjula is correct  that if you want that to happen  you d have to use a POST  or an ajax

User · Answer

You can solve this problem by using AJAX  You don t need to load JQuery for AJAX but it has a better error and success handling than native JS   I would do it like so   1  add an click eventlistener to all my anchors on the page  2  on click  you can setup an ajax-request to your php  in the POST-DATA you set the anchor id or the text-value 3  the php gets the value and you can setup a request to your database  Then you return the value which you need and echo it to the ajax-request  4  your success function of the ajax-request is doing some stuff  For more information about ajax-requests look back here   -  Ajax-Request NATIVE https   blog garstasio com you-dont-need-jquery ajax   A simple JQuery examle      button   click function        ajax  url   demo test txt   success  function result           div1   html result

User · Answer

JavaScript variable   PHP variable try follow -   lt script gt  var a  Hello    lt  php  variable  a     gt   lt  script gt    Note -It run only when you do php code under script tag I have a successfully initialise php variable

User · Answer

If this is related to a form submission  use a hidden inputinside the form and change the hidden input value to this variable value  Then you can get that hidden input value in the php page and assign it to your php variable after form submission   Update   According to your edit  it seems you don t understand how javascript and php works  Javascript is a client side language  and php is a serverside language  Therefore you cannot execute javascript logic and use that variable value to a php variable when you execute relevant page in the server  You can run the relevant javascript logic after client browser process the web page returned from the web server  which has already executed the php code for the relevant page   After the execution of the javascript code and after assigning the relevant value to the relevant javascript variable  you can use form submission or ajax to send that javascript variable value to use by another php page  or a request to process and get the same php page

User · Answer

in your view     lt  php  value     lt p id  quot course id quot  gt  lt  p gt     gt   javascript code    var course   document getElementById  quot courses quot   value      document getElementById  quot course id quot   innerHTML   course

User · Answer

You have to remember that if JS and PHP live in the same document  the PHP will be executed first  at the server  and the JS will be executed second  at the browser --and the two will NEVER interact  excepting where you output JS with PHP  which is not really an interaction between the two engines    With that in mind  the closest you could come is to use a PHP variable in your JS    lt  php  a    foo       a now holds PHP string foo   gt   lt script gt      var a     lt  php echo  a    gt      outputting string foo in context of JS                                    must wrap in quotes so that it is still string foo when JS does execute                                    when this DOES execute in the browser  PHP will have already completed all processing and exited  lt  script gt   lt  php   do something else with  a   JS still hasn t executed at this point   gt    As I stated  in this scenario the PHP  ALL of it  executes FIRST at the server  causing    a PHP variable  a to be created as string  foo  the value of  a to be outputted in context of some JavaScript  which is not currently executing  more done with PHP s  a all output  including the JS with the var assignment  is sent to the browser    As written  this results in the following being sent to the browser for execution  I removed the JS comments for clarity     lt script gt      var a    foo    lt  script gt    Then  and only then  will the JS start executing with its own variable a set to  foo   at which point PHP is out of the picture    In other words  if the two live in the same document and no extra interaction with the server is performed  JS can NOT cause any effect in PHP  Furthermore  PHP is limited in its effect on JS to the simple ability to output some JS or something in context of JS

[php] How can I store JavaScript variable output into a PHP variable?

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