如何精确输出ajax

Question

My code is working well but problem in output. I don't get exact output that i want.

$("#search_traveller_button").click(function(){
                $.ajax({
                    url: "index.php?act=checkSessionUser",
                    type: "POST",
                    cache: false,
                    success: function(data){
                            console.log(data);
                    },
                    error:function(){
                        console.log("Error: Unknown Error");
                    }
                });
            });

PHP code:

<?php
if(isset($_SESSION['userId'])) {
    echo "1";
} else {
    echo "0";
}
?>

output in success gives also html code, why?

0   </div>
        <footer class="nav navbar-inverse">
        ...........
        </footer>
    </body>
</html>

I want in my output only 0 in a variable, not html code.

Answer 1

Because the php is successful in returning a result.

The error would be triggered if the php failed to return.

If you want your Ajax handler to do something different if not logged in either specify in the Ajax handler (not recommended) or do it on the server side (in the php) returning what you want if they are not authenticated.

$("#search_traveller_button").click(function(){
            $.ajax({
                url: "index.php?act=checkSessionUser",
                type: "POST",
                cache: false,
                success: function(data){
                    if (data==1){
                        console.log ("yeah it worked")
                    }else {
                        console.log ("error")
                    }
            });
        });