Now I can find solution:
$('#btn_print_preview').click(function(){
if(validate()){
var invoice_no = $('#txt_invoice_code').val();
var note = $('#txt_note').val();
var result = false;
$.ajax({
type : "POST",
url :
'/Billing_System/Invoices/check_session/',
data : {'invoice_code':invoice_no},
dataType: 'json',
async:false, //NOTE THIS
success : function(data,event){
if(data['result']==true){
success = true
}
else{
alert('Please total invoice
first')
}
}
});
if(success == true){
window.open('preview','_blank')
}
}
})
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