Setting a PHP SESSION var using jQuery

Question

I need to set a PHP   SESSION variable using the jQuery   IF the user clicks on an image I want to save a piece of information associated with that image as a session variable in php   I think I can do this by calling a php page or function and appending that piece of info to the query string     Any ideas   I have found little help through google   thanks mike

User · Answer

Whats you are looking for is jQuery Ajax  And then just setup a php page to process the request

User · Answer

Might want to try putting the PHP function on another PHP page  and use an AJAX call to set the variable

User · Answer

A lot of responses on here are addressing the how but not the why  PHP   SESSION key value pairs are stored on the server  This differs from a cookie  which is stored on the browser  This is why you are able to access values in a cookie from both PHP and JavaScript   To make matters worse  AJAX requests from the browser do not include any of the cookies you have set for the website  So  you will have to make JavaScript pull the Session ID cookie and include it in every AJAX request for the server to be able to make heads or tails of it   On the bright side  PHP Sessions are designed to fail-over to a HTTP GET or POST variable if cookies are not sent along with the HTTP headers  I would look into some of the principles of RESTful web applications and use of of the design patterns that are common with those kinds of applications instead of trying to mangle with the session handler

User · Answer

You can t do it through jQuery alone  you ll need a combination of Ajax  which you can do with jQuery  and a PHP back-end  A very simple version might look like this   HTML    lt img class  foo  src  img jpg    gt   lt img class  foo  src  img2 jpg    gt   lt img class  foo  src  img3 jpg    gt    Javascript      img foo   onclick function            Get the src of the image     var src     this  attr  src            Send Ajax request to backend php  with src set as  img  in the POST data       post   backend php     img   src          PHP  backend php     lt  php        do any authentication first  then add POST variable to session       SESSION  imgsrc       POST  img      gt

User · Answer

in   backend php  be sure to include include   session start     -Taylor  http   www hawkessolutions com

User · Answer

It works on firefox  if you change onClick   to click   in javascript part    x000D   x000D     img foo   click function   x000D    x000D         Get the src of the image x000D      var src     this  attr  src    x000D   x000D         Send Ajax request to backend php  with src set as  img  in the POST data x000D        post   backend php     img   src    x000D      x000D   x000D   x000D

User · Answer

I also designed a  php session value setter  solution by myself  similar to Luke Dennis  solution  No big deal here   but after setting my session value  my needs were  jumping onto another  php file   Ok  I did it  inside my jquery code    But something didn t quite work     My problem was kind of easy   -After you    post  your values onto the small  php file  you should wait for some  success failure  return value  and ONLY AFTER READING THIS SUCCESS VALUE  perform the jump  If you just immediately jump onto the next big  php file  your session value might have not become set onto the php sessions runtime engine  and will you probably read  empty  when doing   SESSION  my var    from the destination  php file   In my case  to correct that situation  I changed my jQuery   post code this way     post  set session value php     key   keyname   value   myvalue    function ret       if ret  0           window alert  success             location replace  next page php              else          window alert  error                 Of course  your  set session value php  file  should return  echo  0      or  echo  1      or whatever success values you might need    Greetings

User · Answer

Similar to Luke s answer  but with GET   Place this php-code in a php-page  ex  getpage php    lt  php   SESSION  size       GET  size      gt    Then call it with a jQuery script like this     get    getpage php size 1      Agree with Federico  In some cases you may run into problems using POST  although not sure if it can be browser related

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