Semantic UI custom form validation with Ajax - ajax

Question

I am trying to implement custom form validation rules for my username field, which should check the database for duplicated or not.
After Searching on the internet, I had write out some code, and it successful getting the response "true / false" from my server. But the fields in the form doesn't update as it should. Below was my javascript code.
$.fn.form.settings.rules.checkUsername = function(value) {
var res = true;
$.ajax({
async : false,
url: '<?= Yii::app()->createAbsoluteUrl('home/doCheckUsername') ?>',
type : "POST",
data : {
username : value
},
dataType: "json",
success: function(data) {
if (data.result == true) {
console.log(data.result);
return false;
} else {
console.log(data.result);
return true;
}
}
});
};
$('.ui.form').form({
username: {
identifier : 'username',
rules: [{
type : 'checkUsername',
prompt : 'Username Already Exists'
}]
}
// some other rules
}, {
inline : true,
on : 'blur',
onSuccess : function(){
//post to controller
}
});
The console.log showing me the correct result as I want, but I keep getting "Username Is Exist" as show at the picture
Semantic UI form Validation result
May I know where are the place I doing it wrong ?

Answer 1

Somehow, Added Async at the ajax solve the problem.
$.ajax({
async : false,
url: '<?= Yii::app()->createAbsoluteUrl('home/doCheckUsername') ?>',
type : "POST",
async: false,
data : {
username : value
},
dataType: "json",
success: function(data) {
if (data.result == true) {
console.log(data.result);
res = false;
}
}
});

Answer 2

Put result in the res variable and return the res variable after the ajax call !
Work for me :
$.fn.form.settings.rules.checkemail = function(value) {
var res = true;
$.ajax({
async : false,
url: '../php/email_exist.php',
type : "POST",
async: false,
data : {
email : value
},
success: function(data) {
console.log(data);
if (data == "0") {
console.log("OK");
res = true;
} else {
console.log("KO");
res = false;
}
}
});
return res;
};

Answer 3

$.fn.form.settings.rules.checkUsername = function(value) {
var res = true;
$.ajax({
async : false,
url: '<?= Yii::app()->createAbsoluteUrl('home/doCheckUsername') ?>',
type : "POST",
data : {
username : value
},
dataType: "json",
success: function(data) {
if (data.result == true) {
//console.log(data.result);
//return false;
**value = 0;**
} else {
//console.log(data.result);
//return true;
**value = 1;**
}
}
});
**return (value == 1 )? true : false;**
};
$('.ui.form').form({
username: {
identifier : 'username',
rules: [{
type : '**checkUsername[value]**',
prompt : 'Username Already Exists'
}]
}
// some other rules
}, {
inline : true,
on : 'blur',
onSuccess : function(){
//post to controller
}
});