I have a question about ajax success. So in previous situations I have returned Data something like ID but now in this case I'm returning entire table. So I would like to check if Ajax was successful(200 OK) before I retrieve my data. What is the best way to do that? Also I use new way to retrieve data and check for errors with JQuery. Here is example of my code:

<div id="box"></div>

function getSlots(fld){
    var userID = '134';

    $j.ajax({
        type:  'POST',
        url:  'AjaxData.html',
        cache:  false,
        data:  {'userID':userID},
            dataType: "html",
            async:   false
        })  
        .done(function(html){
            $j('#box').html(html);
        })
        .fail(function(jqXHR, textStatus, errorThrown){ 
            gwLogIt(errorThrown);
        }); 
    }

I have a question about ajax success. So in previous situations I have returned Data something like ID but now in this case I'm returning entire table. So I would like to check if Ajax was successful(200 OK) before I retrieve my data. What is the best way to do that? Also I use new way to retrieve data and check for errors with JQuery. Here is example of my code:

<div id="box"></div>

function getSlots(fld){
    var userID = '134';

    $j.ajax({
        type:  'POST',
        url:  'AjaxData.html',
        cache:  false,
        data:  {'userID':userID},
            dataType: "html",
            async:   false
        })  
        .done(function(html){
            $j('#box').html(html);
        })
        .fail(function(jqXHR, textStatus, errorThrown){ 
            gwLogIt(errorThrown);
        }); 
    }

• javascript
• jquery
• ajax
• ajax-request

• Why do you need to check for 200 OK? Doesn't .done check for that for you? What problem are you facing with this code? – gen_Eric Commented Apr 29, 2016 at 19:06
• P.S. Why are you using async: false? I wouldn't suggest using that because it will lock up the user's browser until the call is done. – gen_Eric Commented Apr 29, 2016 at 19:07
• I do not know if .done actually check for that. In the past I was putting if statement inside of success. – espresso_coffee Commented Apr 29, 2016 at 19:07
• What would you remend to use instead? – espresso_coffee Commented Apr 29, 2016 at 19:08
• Instead of async: false? Or I do not need that. – espresso_coffee Commented Apr 29, 2016 at 19:15

2 Answers 2

You don't need to check. The various callbacks are called under the following conditions:

• .done() or success: are called when the AJAX call is successful.
• .fail() or error: are called when there's an error (either from the server or in the jQuery code that parses the response).
• .always() or plete: are called in either case.

from official docs:

$.ajax({
  statusCode: {
    404: function() {
      alert( "page not found" );
    }
  }
});

http://api.jquery./jQuery.ajax/

also if you use something like babel to transpile ES6, you can use fetch api for ajax calls. I personally stopped using jQuery ±2 years ago.. when moved to React world :)