pass javascript variable to a php variable

Question

Good morning, everyone,

I’m having a question:

i have a select that takes the one array from the database, and every time the user changes the select it has a change in javascript that update it in an input of type Hidden >

<input id="id_clinic_hidden" hidden name="clinic_id">

the javascript function is this:

$(document).ready(function () {
    $(document).on("change", "#doc_sel_clinic", function(){
        var id = $(this).val();
        $("#id_clinic_hidden").val(id);
        alert(id);
    });
});

What I want to do is take this javascript id variable for php, it can be via session. This is inside javascript because I need to change the value when the user changes the select.

thank you

Answer 1

Follow an example:

var myval = 'test';

$.ajax({
  type: 'POST',
  url: 'seuphpfile.php',
  data: {'variable': myval},
});

Receiving variable in PHP (seuphpfile.php)

$minhaVariavel = $_POST['variable'];

Answer 2

For this you will need to work with ajax, who makes requisitions http asynchronous form;

$.ajax({
   url : 'caminho_do_php_que_ira_recebe_o_input.php',
   dataType : 'html',
   type : 'POST',
   data : {'id' : id},
   beforeSend : function () {
         console.log('Carregando...');
   },
   success : function(retorno){
       console.log(retorno);
   },
   error : function(a,b,c){
       console.log('Erro: '+a[status]+' '+c);
   }
});

Basically it is to call in a function (at the time you want to send) and ready, on the server side, just receive as follows:

$valor_recebido = $_POST['id'];

If you wanted to receive some feedback after sending with the return of PHP, just receive and work with this variable call retorno (if you think it best to name as you prefer).

Answer 3

did so in javascript as vcs recommended:

$(document).ready(function() {
  $(document).on("change", "#doc_sel_clinic", function(){
    var id = $(this).val();
    $("#id_clinic_hidden").val(id);

    $.ajax({
      type: 'POST',
      url: base_url + 'Doctor/config_schedule',
      data: {'id_selected': id},
    });

    console.log(id);
  });

and tried searching for in php>

<?php $minhaVariavel = $_POST['id_selected']; ?>

However I did not succeed, returns error:

Message: Undefined index: id_selected