How can I use a JavaScript variable as a PHP variable

Question

I m trying to include JavaScript variables into PHP code as PHP variables  but I m having problems doing so  When a button is clicked  the following function is called    lt script type  text javascript  gt      function addTraining leve  name  date                var level var   document getElementById leve           var training name var   document getElementById name           var training date var   document getElementById date             lt  php              result    INSERT INTO training level  school name  training date  VALUES  level var    training name var    training date var    or die  Query not possible               gt    lt  script gt    Is it possible

User · Answer

You can take all values like this    abc     lt script gt document getElementByID  yourid   value lt  script gt

User · Answer

lt script type  text javascript  gt  var jvalue    this is javascript value     lt  php  abc     lt script gt document write jvalue  lt  script gt    gt      lt  script gt   lt  php echo   php    abc   gt

User · Answer

You seem to be confusing client-side and server side code  When the button is clicked you need to send  post  get  the variables to the server where the php can be executed  You can either submit the page or use an ajax call to submit just the data  -don

User · Answer

I had the same problem a few weeks ago like yours  but I invented a brilliant solution for exchanging variables between PHP and JavaScript  It worked for me well    Create a hidden form on a HTML page Create a Textbox or Textarea in that hidden form After all of your code written in the script  store the final value of your variable in that textbox Use   REQUEST  textbox name   line in your PHP to gain access to value of your JavaScript variable    I hope this trick works for you

User · Answer

PHP is run server-side  JavaScript is run client-side in the browser of the user requesting the page  By the time the JavaScript is executed  there is no access to PHP on the server whatsoever  Please read this article with details about client-side vs server-side coding   What happens in a nutshell is this    You click a link in your browser on your computer under your desk The browser creates an HTTP request and sends it to a server on the Internet The server checks if he can handle the request If the request is for a PHP page  the PHP interpreter is started The PHP interpreter will run all PHP code in the page you requested The PHP interpreter will NOT run any JS code  because it has no clue about it The server will send the page assembled by the interpreter back to your browser Your browser will render the page and show it to you JavaScript is executed on your computer   In your case  PHP will write the JS code into the page  so it can be executed when the page is rendered in your browser  By that time  the PHP part in your JS snippet does no longer exist  It was executed on the server already  It created a variable  result that contained a SQL query string  You didn t use it  so when the page is send back to your browser  it s gone  Have a look at the sourcecode when the page is rendered in your browser  You will see that there is nothing at the position you put the PHP code   The only way to do what you are looking to do is either    do a redirect to a PHP script or do an AJAX call to a PHP script   with the values you want to be insert into the database

User · Answer

You can do what you want  but not like that   What you need to do is make an AJAX request from JavaScript back to the server where a separate PHP script can do the database operation

User · Answer

PHP runs on the server  It outputs some text  usually   This is then parsed by the client    During and after the parsing on the client  JavaScript runs  At this stage it is too late for the PHP script to do anything   If you want to get anything back to PHP you need to make a new HTTP request and include the data in it  either in the query string  GET data  or message body  POST data    You can do this by    Setting location  GET only  Submitting a form  with the FormElement submit   method  Using the XMLHttpRequest object  the technique commonly known as Ajax   Various libraries do some of the heavy lifting for you here  e g  YUI or jQuery    Which ever option you choose  the PHP is essentially the same  Read from   GET or   POST  run your database code  then return some data to the client

[php] How can I use a JavaScript variable as a PHP variable?

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