Question

test.php

$aaa = $_POST['aaa'];

echo $aaa;

Javascript Code

$.ajax({

url: 'ajax/test.php', 
data: { aaa: 'names_' },
success: function(data) {
alert("Data Loaded: " + data); 
            }
      });

The alert response is:

NOTICE: Undefined Index: aaa  

What might cause this?

Answer 1

Add to the ajax object the type attribute:

$.ajax({
  url: 'ajax/test.php', 
  type:'post',
  data: { aaa: 'names_' },
  success: function(data) {
    alert("Data Loaded: " + data); 
  }
});