How do I catch an Ajax query post error

Question

I would like to catch the error and show the appropriate message if the Ajax request fails   My code is like the following  but I could not manage to catch the failing Ajax request   function getAjaxData id           post  status ajax php    deviceId   id   function data            var tab1           if  data length gt 0                tab1   data                    else               tab1    Error in Ajax                      return tab1              I found out that   Error in Ajax  is never executed when the Ajax request failed   How do I handle the Ajax error and show the appropriate message if it fails

User · Answer

ajax     type   POST     url   status ajax php     data         deviceId  id        success  function data           your code from above        error  function xhr  textStatus  error         console log xhr statusText         console log textStatus         console log error

User · Answer

In case you want to utilize  then   which has a subtle difference in comparison with  done     return   post url  payload   then      function  result  textStatus  jqXHR            return result             function  jqXHR  textStatus  errorThrown            return console error errorThrown

User · Answer

A simple way is to implement ajaxError      Whenever an Ajax request completes   with an error  jQuery triggers the   ajaxError event  Any and all handlers   that have been registered with the    ajaxError   method are executed at   this time    For example       log   ajaxError function         this  text  Triggered ajaxError handler           I would suggest reading the ajaxError documentation  It does more than the simple use-case demonstrated above - mainly its callback accepts a number of parameters       log   ajaxError function e  xhr  settings  exception      if  settings url     ajax missing html           this  text  Triggered ajaxError handler

User · Answer

you attach the  onerror handler to the ajax object  why people insist on posting JQuery for responses when vanila works cross platform     quickie example    ajax   new XMLHttpRequest    ajax open   POST     url to handler php   true    ajax onerror   function        alert  Oops  Something went wrong         ajax send someWebFormToken

User · Answer

Since jQuery 1 5 you can use the deferred objects mechanism     post  some php    name   John         done function msg            fail function xhr  status  error               error handling           Another way is using  ajax     ajax     type   POST     url   some php     data   name John amp location Boston     success  function msg           alert   Data Saved      msg           error  function XMLHttpRequest  textStatus  errorThrown         alert  some error

User · Answer

jQuery 1 5 added deferred objects that handle this nicely  Simply call   post and attach any handlers you d like after the call  Deferred objects even allow you to attach multiple success and error handlers   Example     post  status ajax php    deviceId  id        done  function msg                 fail  function xhr  textStatus  errorThrown            alert xhr responseText             Prior to jQuery 1 8  the function done was called success and fail was called error

User · Answer

post  someUri           function data   doSomeStuff      fail function error    alert error responseJSON

User · Answer

You have to log the responseText     ajax       type   POST       url   status ajax php       data        deviceId  id         done   function  data        your code       fail function  data          console log   Ajax failed      data  responseText

[jquery] How do I catch an Ajax query post error?

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