You are sending data with
Ajax with a POST or GET method is incomplete working or not working. This error, which is one of the most common problems in JavaScript, is çömyself with a single function.
Your script should be as follows;
$.ajax({
type: "POST",
url: 'ajax.php',
data: "user_id='"+useridvalue+"'",
success: function(response){
}
}); all we have to do here is to practice the useridvalue value with encodeURIComponent(useridvalue) function as below.
$.ajax({
type: "POST",
url: 'ajax.php',
data: "user_id='"+encodeURIComponent(useridvalue)+"'",
success: function(response){
}
}); 
