Passing javascript variable to PHP function

Question

I have this javascript code

<Script>
    function getGroupId(){
        var group=document.getElementById("selectedOptions").value;
        var groupFirstLetter=group.substring(2);

    }
</Script>

I need to pass the groupFirstLetter to a PHP function which will count how many users in this group and return the value to the javascript function.

Any ideas please?

Thanks,

there are only 2 ways to archieve that. 1. Ajax 2. reload page. JS runs in your client, PHP on the server. as soon as you requested a page and got your answer there is nothing happening on the server anymore (except for sockets or ajax). Without those 2 options you cant let js communicate with php — Mohammer, Apr 10 '12 at 07:25

Songo · Accepted Answer · 2012-04-10T07:32:51.897

You can use jQuery for that to post an AJAX request. See this example taken out of jQuery documentation:

$.ajax({
  type: "POST",
  url: "some.php",
  data: {groupFirstLetter:groupFirstLetter},
  complete: function(data){
            //data contains the response from the php file.
            //u can pass it here to the javascript function
        }
});

The variable will be available in your PHP code as $_POST['groupFirstLetter']. You can manipulate it as you wish then echo a response to the browser again and it will be available in the data variable. references:

jQuery AJAX

score 1 · Answer 2 · edited May 23 '17 at 11:56

1

As javascript runs on user's browser you have to do an http request to a php page. POST or GET can be used to send parameters.

To make a http call with javascript refer to this: HTTP GET request in JavaScript?

edited May 23 '17 at 11:56

Community

1
1

answered Apr 10 '12 at 07:25

ab_dev86

1,952
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21

score 1 · Answer 3 · answered Apr 10 '12 at 07:29

Use jQuery (jquery.com).

Dynamically load the php-file sending the variable using ajax like so:

$.post("file.php", {variable_name: value}, function(returned_data){
    console.log(returned_data); //or do whatever you like with the variable
});

and your php-file will access the variable as:

$_POST['variable_name'];

Passing javascript variable to PHP function

3 Answers3