Question

If i have this json response

{"error":"repeated"}

Why the alert is not showed? It is needed put somewhere dataType: "json" ?

$(function () {
        $("#box a").click(function () {
            var selectedId = $(this).attr("class");

            $.post("new_list.php", {
                id_user: <?php echo $id;?>,
                id_list: selectedId
            }, function (data) {
                   if(data.error == 'repeated') {
                        alert("error");
                   }
            }); 
        }); 
    });

thanks

Answer 1

It’s not going to automatically parse it as JSON unless you tell it to.

$(function () {
    $("#box a").click(function () {
        var selectedId = $(this).attr("class");

        $.post("new_list.php", {
            id_user: <?php echo $id;?>,
            id_list: selectedId
        }, function (data) {
               if(data.error == 'repeated') {
                    alert("error");
               }
        },
        "json"); //Here, add this as last parameter
    }); 
});