Send PHP variable to javascript function

Question

I have a php file that generates a variable and I would like the variable to be put into a javascript function which is called by onclick on the main page   Is this possible to send from PHP to javascript

User · Accepted Answer

You can do the following    lt script type  text javascript  gt      document body onclick function            var myVariable    lt  php echo json encode  myVariable      gt           lt  script gt

User · Answer

Just write    lt script gt      var my variable name     lt  php echo  php string    gt     lt  script gt    Now it s available as a JavaScript variable by the name of my variable name at any point below the above code

User · Answer

Your JavaScript would have to be defined within a PHP-parsed file   For example  in index php you could place   lt  php  time   time      gt   lt script gt      document write  lt  php echo  time    gt     lt  script gt

User · Answer

A great option is to use jQuery AJAX   Look at these examples and try them out on your server  In this example  in FILE1 php  note that it is passing a blank value  You can pass a value if you wish  which might look something like this  assuming javascript vars called username and password   data   username   username   amp password   password    In the FILE2 php example  you would retrieve those values like this    uname     POST  username     pword     POST  password      Then do your MySQL lookup and return the values thus   echo  You are logged in     This would deliver the message You are logged in to the success function in FILE1 php  and the message string would be stored in the variable called  data    Therefore  the alert data   line in the success function would alert that message  Of course  you can echo anything that you like  even large amounts of HTML  such as entire table structures   Here is another good example to review   The approach is to create your form  and then use jQuery to detect the button press and submit the data to a secondary PHP file via AJAX   The above examples show how to do that    The secondary PHP file receives the variables  if any are sent  and returns a response  whatever you choose to send   That response then appears in the Success  section of your AJAX call as  data   in these examples    The jQuery AJAX code is javascript  so you have two options  you can place it within  lt script type  text javascript  gt  lt  script gt  tags within your main PHP document  or you can  lt  php include  my javascript stuff js     gt  at the bottom of your PHP document  If you are using jQuery  don t forget to include the jQuery library as in the examples given   In your case  it sounds like you can pretty much mirror the first example I suggested  sending no data and receiving the response in the AJAX success function   Whatever you need to do with that data  though  you must do inside the success function   Seems a bit weird at first  but it works

User · Answer

You can pass PHP values to JavaScript  The PHP will execute server side so the value will be calculated and then you can echo it to the HTML containing the javascript  The javascript will then execute in the clients browser with the value PHP calculated server-side    lt script type  text javascript  gt         Do something in JavaScript     var x    lt  php echo  calculatedValue    gt          etc    lt  script gt

User · Answer

If I understand you correctly  you should be able to do something along the lines of the following   function clicked         var someVariable   lt  php echo  phpVariable    gt

[php] Send PHP variable to javascript function

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