javascript - How to handle an error on ajax login form? -

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i have several login forms use ajax, when information wrong page refreshes. want catch keyword/variable php, right echoing 'error', , want alert on page no refresh. here's current js. when submit, login object created , login method performed, if successful redirects dashboard if not echos 'error' , how can accomplish need javascript? 

<script> $('#doctor_login').on("submit", function(e){   frmreg = document.getelementbyid("doctor_login");       if(frmreg.user_name.value == "")     { alert("<?php echo _username_empty_alert; ?>"); frmreg.user_name.focus(); return false;             }else if(frmreg.password.value == ""){ alert("<?php echo _password_is_empty; ?>"); frmreg.password.focus(); return false;             }else{             $.ajax({      type:'post',     url: '../page/handler/handler_ajax_login.php',     data: $(this).serialize()     }       });     } });

jquery exposes error callback on $.ajax method, documented on http://api.jquery.com/jquery.ajax/

$.ajax({     type:'post',     url: '../page/handler/handler_ajax_login.php',     data: $(this).serialize(),     error: function(jqxhr, textstatus, errorthrown) {         console.log(textstatus, errorthrown);     } }

to trigger error callback, must return 400 or 500 range http code.

<?php  header("http/1.1 400 bad request");

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