javascript - Issue using remote method in jquery validation -

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i'm following this article in order validate form

my problem when have use remote method, e.g. remote: "check-username.php"

since documentation remote method not clear me, know:

how need structure json output in php script?

you don't need json. can put text. example can 

echo "success";

for passed validation, , enter validation message like:

echo "username exists.";

for failed validation.

in callback this:

remote: {            url: "check-username.php" ,            type: "post" ,            data: {               username: function() {               return $("#username").val();            },            complete: function(data){                 if( data.responsetext != "success" ) {                    alert(data.responsetext);                    //handle failed validation                 }              }          }

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