jQuery ajax请求同一页面PHP无法执行

Question

I am trying to send a variable in a request to the same page and then check if the variable is set.

 $.ajax({
            url: "index.php",
            type: "POST",
            data:  {idss:idss},
            success: function(data){
                console.log("hello");
            }
        }); 

if(isset($_POST['idss'])){
    echo "Set";
}

However, when this runs I only see "hello" in the console and yet I dont see the output of 'echo' on the page.

Am I doing something wrong?

Answer 1

The POST data is being sent to the page in your ajax request, not your current page. index.php would have that POST data set.

Answer 2

   $.ajax({
            url: "index.php",
            type: "POST",
            data:  {idss:idss},
            success: function(data){
                console.log("hello");
                $('#here').html(data['whatever_you_returned']);
            }
        }); 

   <div id="here"></div>