Ajax Success Data Json | How To Convert Jquery Ajax To Native Javascript?

How to parse the JSON object in ajax success

Solution 1:

The response variable is being passed into the success function with the

data

code. However, the

console.log(json)

code will be undefined since the non-existent

json

variable cannot be used.


$.ajax({ url : url, type: 'post', dataType:'json', success : function(data) { console.log(data); } });


Solution 2:

Modify the data type to

json

and append

&callback=?

to the URL.

Solution 3:

Ensure that the AJAX request indeed returns the data.


{ "title": "Some title", "link": "http://google.com", "desc": "Some description", "items": [{"title":"some title"}] }.


This format is suitable for utilizing as an associative array, similar to:


var title=data["title"]; //this will give you "some title" var items=data["items"]; //this will give you a list of items. var item_title=items["title"]; //process list of items similarly


etc.

How to convert jquery ajax to native javascript?

Solution:

I removed the Jquery dependency from the ajax function and made it functional independently.

Substitute

$.ajax(attributes);

with

ajax(attributes);

.

JQuery’s ajax function, without JQuery :


function ajax(option) { // $.ajax(...) without jquery. if (typeof(option.url) == "undefined") { try { option.url = location.href; } catch(e) { var ajaxLocation; ajaxLocation = document.createElement("a"); ajaxLocation.href = ""; option.url = ajaxLocation.href; } } if (typeof(option.type) == "undefined") { option.type = "GET"; } if (typeof(option.data) == "undefined") { option.data = null; } else { var data = ""; for (var x in option.data) { if (data != "") { data += "&"; } data += encodeURIComponent(x)+"="+encodeURIComponent(option.data[x]); }; option.data = data; } if (typeof(option.statusCode) == "undefined") { // 4 option.statusCode = {}; } if (typeof(option.beforeSend) == "undefined") { // 1 option.beforeSend = function () {}; } if (typeof(option.success) == "undefined") { // 4 et sans erreur option.success = function () {}; } if (typeof(option.error) == "undefined") { // 4 et avec erreur option.error = function () {}; } if (typeof(option.complete) == "undefined") { // 4 option.complete = function () {}; } typeof(option.statusCode["404"]); var xhr = null; if (window.XMLHttpRequest || window.ActiveXObject) { if (window.ActiveXObject) { try { xhr = new ActiveXObject("Msxml2.XMLHTTP"); } catch(e) { xhr = new ActiveXObject("Microsoft.XMLHTTP"); } } else { xhr = new XMLHttpRequest(); } } else { alert("Votre navigateur ne supporte pas l'objet XMLHTTPRequest..."); return null; } xhr.onreadystatechange = function() { if (xhr.readyState == 1) { option.beforeSend(); } if (xhr.readyState == 4) { option.complete(xhr, xhr.status); if (xhr.status == 200 || xhr.status == 0) { option.success(xhr.responseText); } else { option.error(xhr.status); if (typeof(option.statusCode[xhr.status]) != "undefined") { option.statusCode[xhr.status](); } } } }; if (option.type == "POST") { xhr.open(option.type, option.url, true); xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8"); xhr.send(option.data); } else { xhr.open(option.type, option.url+option.data, true); xhr.send(null); } }


Use Ajax Success Handler to return JSON object

Solution 1:

You were close,


var json; $.ajax({ url: 'http://localhost:9200/wcs/routes/_search', type: 'POST', data : JSON.stringify( { "query" : { "match_all" : {} } }), dataType : 'json', async: false, success: function(data){ json = data; } }) console.log(json);


Instead of using

async: false

, which is not a good idea, I recommend utilizing JSON within the callback.


$.ajax({ url: 'http://localhost:9200/wcs/routes/_search', type: 'POST', data : JSON.stringify( { "query" : { "match_all" : {} } }), dataType : 'json', //async: false, success: function(data){ console.log(data); } })


Solution 2:


var arr = new Array(); success: function (data) { $.map(data, function (item) { arr.push({ prop_1: item.prop_1, prop_2: item.prop_2, prop_3: item.prop_3 }); }); }


You have the flexibility to rename prop_1 and prop_2 according to your codebehind.

Solution 3:

The

Success

anticipates that a function will be invoked upon successful completion of the request.

You can do this :


var json: .... .... success: function(data){ json = data; } });


jQuery.ajax( url [, settings ] )Returns: jqXHR

Description: Perform an asynchronous HTTP (Ajax) request.

• version added: 1.5jQuery.ajax( url [, settings ] )
  
  • urlA string containing the URL to which the request is sent.
  • settingsA set of key/value pairs that configure the Ajax request. All settings are optional. A default can be set for any option with $.ajaxSetup(). See jQuery.ajax( settings ) below for a complete list of all settings.
• version added: 1.0jQuery.ajax( [settings ] )
  
  • settingsA set of key/value pairs that configure the Ajax request. All settings are optional. A default can be set for any option with $.ajaxSetup().
    • accepts (default:
      
depends on dataType

      )A set of key/value pairs that map a given
      
dataType

      to its MIME type, which gets sent in the
      
Accept

      request header. This header tells the server what kind of response it will accept in return. For example, the following defines a custom type
      
mycustomtype

      to be sent with the request:12345678910111213141516
      
$.ajax({


accepts: {


mycustomtype: 'application/x-some-custom-type'


},


// Instructions for how to deserialize a `mycustomtype`


converters: {


'text mycustomtype': function(result) {


// Do Stuff


return newresult;


},


// Expect a `mycustomtype` back from server


dataType: 'mycustomtype'


});


converters

      for this to work properly.
    • async (default:
      
true

      )By default, all requests are sent asynchronously (i.e. this is set to
      
true

      by default). If you need synchronous requests, set this option to
      
false

      . Cross-domain requests and
      
dataType: "jsonp"

      requests do not support synchronous operation. Note that synchronous requests may temporarily lock the browser, disabling any actions while the request is active. As of jQuery 1.8, the use of
      
async: false

      with jqXHR (
      
$.Deferred

      ) is deprecated; you must use the success/error/complete callback options instead of the corresponding methods of the jqXHR object such as
      
jqXHR.done()

      .
    • beforeSendType: Function( jqXHR jqXHR, PlainObject settings )A pre-request callback function that can be used to modify the jqXHR (in jQuery 1.4.x, XMLHTTPRequest) object before it is sent. Use this to set custom headers, etc. The jqXHR and settings objects are passed as arguments. This is an Ajax Event. Returning
      
false

      in the
      
beforeSend

      function will cancel the request. As of jQuery 1.5, the
      
beforeSend

      option will be called regardless of the type of request.
    • cache (default:
      
true, false for dataType 'script' and 'jsonp'

      )If set to
      
false

      , it will force requested pages not to be cached by the browser. Note: Setting
      
cache

      to false will only work correctly with HEAD and GET requests. It works by appending “_={timestamp}” to the GET parameters. The parameter is not needed for other types of requests, except in IE8 when a POST is made to a URL that has already been requested by a GET.
    • completeA function to be called when the request finishes (after
      
success

      and
      
error

      callbacks are executed). The function gets passed two arguments: The jqXHR (in jQuery 1.4.x, XMLHTTPRequest) object and a string categorizing the status of the request (
      
"success"

      ,
      
"notmodified"

      ,
      
"nocontent"

      ,
      
"error"

      ,
      
"timeout"

      ,
      
"abort"

      , or
      
"parsererror"

      ). As of jQuery 1.5, the
      
complete

      setting can accept an array of functions. Each function will be called in turn. This is an Ajax Event.
    • contentsAn object of string/regular-expression pairs that determine how jQuery will parse the response, given its content type. (version added: 1.5)
    • contentType (default:
      
'application/x-www-form-urlencoded; charset=UTF-8'

      )When sending data to the server, use this content type. Default is “application/x-www-form-urlencoded; charset=UTF-8”, which is fine for most cases. If you explicitly pass in a content-type to
      
$.ajax()

      , then it is always sent to the server (even if no data is sent). As of jQuery 1.6 you can pass
      
false

      to tell jQuery to not set any content type header. Note: The W3C XMLHttpRequest specification dictates that the charset is always UTF-8; specifying another charset will not force the browser to change the encoding. Note: For cross-domain requests, setting the content type to anything other than
      
application/x-www-form-urlencoded

      ,
      
multipart/form-data

      , or
      
text/plain

      will trigger the browser to send a preflight OPTIONS request to the server.
    • contextThis object will be the context of all Ajax-related callbacks. By default, the context is an object that represents the Ajax settings used in the call (
      
$.ajaxSettings

      merged with the settings passed to
      
$.ajax

      ). For example, specifying a DOM element as the context will make that the context for the
      
complete

      callback of a request, like so:123456
      
$.ajax({


url: "test.html",


context: document.body


}).done(function() {


$( this ).addClass( "done" );


});

    • converters (default:
      
{"* text": window.String, "text html": true, "text json": jQuery.parseJSON, "text xml": jQuery.parseXML}

      )An object containing dataType-to-dataType converters. Each converter’s value is a function that returns the transformed value of the response. (version added: 1.5)
    • crossDomain (default:
      
false for same-domain requests, true for cross-domain requests

      )If you wish to force a crossDomain request (such as JSONP) on the same domain, set the value of crossDomain to
      
true

      . This allows, for example, server-side redirection to another domain. (version added: 1.5)
    • dataType: PlainObject or String or Array

      Data to be sent to the server. If the HTTP method is one that cannot have an entity body, such as GET, the

      
data

      is appended to the URL.

      When

      
data

      is an object, jQuery generates the data string from the object’s key/value pairs unless the
      
processData

      option is set to
      
false

      . For example,
      
{ a: "bc", d: "e,f" }

      is converted to the string
      
"a=bc&d=e%2Cf"

      . If the value is an array, jQuery serializes multiple values with same key based on the value of the
      
traditional

      setting (described below). For example,
      
{ a: [1,2] }

      becomes the string
      
"a%5B%5D=1&a%5B%5D=2"

      with the default
      
traditional: false

      setting.

      When

      
data

      is passed as a string it should already be encoded using the correct encoding for
      
contentType

      , which by default is
      
application/x-www-form-urlencoded

      .

      In requests with

      
dataType: "json"

      or
      
dataType: "jsonp"

      , if the string contains a double question mark (
      
??

      ) anywhere in the URL or a single question mark () in the query string, it is replaced with a value generated by jQuery that is unique for each copy of the library on the page (e.g.
      
jQuery21406515378922229067_1479880736745

      ).

    • dataFilterA function to be used to handle the raw response data of XMLHttpRequest. This is a pre-filtering function to sanitize the response. You should return the sanitized data. The function accepts two arguments: The raw data returned from the server and the ‘dataType’ parameter.
    • dataType (default:
      
Intelligent Guess (xml, json, script, or html)

      )The type of data that you’re expecting back from the server. If none is specified, jQuery will try to infer it based on the MIME type of the response (an XML MIME type will yield XML, in 1.4 JSON will yield a JavaScript object, in 1.4 script will execute the script, and anything else will be returned as a string). The available types (and the result passed as the first argument to your success callback) are:
      • 
"xml"

        : Returns a XML document that can be processed via jQuery.
      • 
"html"

        : Returns HTML as plain text; included script tags are evaluated when inserted in the DOM.
      • 
"script"

        : Evaluates the response as JavaScript and returns it as plain text. Disables caching by appending a query string parameter,
        
_=[TIMESTAMP]

        , to the URL unless the
        
cache

        option is set to
        
true

        . Note: This will turn POSTs into GETs for remote-domain requests. Prior to jQuery 3.5.0, unsuccessful HTTP responses with a script
        
Content-Type

        were still executed.
      • 
"json"

        : Evaluates the response as JSON and returns a JavaScript object. Cross-domain
        
"json"

        requests that have a callback placeholder, e.g.
        
?callback=?

        , are performed using JSONP unless the request includes
        
jsonp: false

        in its request options. The JSON data is parsed in a strict manner; any malformed JSON is rejected and a parse error is thrown. As of jQuery 1.9, an empty response is also rejected; the server should return a response of
        
null

        or
        
{}

        instead. (See json.org for more information on proper JSON formatting.)
      • 
"jsonp"

        : Loads in a JSON block using JSONP. Adds an extra
        
"?callback=?"

        to the end of your URL to specify the callback. Disables caching by appending a query string parameter,
        
"_=[TIMESTAMP]"

        , to the URL unless the
        
cache

        option is set to
        
true

        .
      • 
"text"

        : A plain text string.
      • multiple, space-separated values: As of jQuery 1.5, jQuery can convert a dataType from what it received in the Content-Type header to what you require. For example, if you want a text response to be treated as XML, use
        
"text xml"

        for the dataType. You can also make a JSONP request, have it received as text, and interpreted by jQuery as XML:
        
"jsonp text xml"

        . Similarly, a shorthand string such as
        
"jsonp xml"

        will first attempt to convert from jsonp to xml, and, failing that, convert from jsonp to text, and then from text to xml.
    • errorA function to be called if the request fails. The function receives three arguments: The jqXHR (in jQuery 1.4.x, XMLHttpRequest) object, a string describing the type of error that occurred and an optional exception object, if one occurred. Possible values for the second argument (besides
      
null

      ) are
      
"timeout"

      ,
      
"error"

      ,
      
"abort"

      , and
      
"parsererror"

      . When an HTTP error occurs,
      
errorThrown

      receives the textual portion of the HTTP status, such as “Not Found” or “Internal Server Error.” (in HTTP/2 it may instead be an empty string) As of jQuery 1.5, the
      
error

      setting can accept an array of functions. Each function will be called in turn. Note: This handler is not called for cross-domain scripts and cross-domain JSONP requests. This is an Ajax Event.
    • global (default:
      
true

      )Whether to trigger global Ajax event handlers for this request. The default is
      
true

      . Set to
      
false

      to prevent the global handlers like
      
ajaxStart

      or
      
ajaxStop

      from being triggered. This can be used to control various Ajax Events.
    • headers (default:
      
{}

      )An object of additional header key/value pairs to send along with requests using the XMLHttpRequest transport. The header
      
X-Requested-With: XMLHttpRequest

      is always added, but its default
      
XMLHttpRequest

      value can be changed here. Values in the
      
headers

      setting can also be overwritten from within the
      
beforeSend

      function. (version added: 1.5)
    • ifModified (default:
      
false

      )Allow the request to be successful only if the response has changed since the last request. This is done by checking the Last-Modified header. Default value is
      
false

      , ignoring the header. In jQuery 1.4 this technique also checks the ‘etag’ specified by the server to catch unmodified data.
    • isLocal (default:
      
depends on current location protocol

      )Allow the current environment to be recognized as “local,” (e.g. the filesystem), even if jQuery does not recognize it as such by default. The following protocols are currently recognized as local:
      
file

      ,
      
*-extension

      , and
      
widget

      . If the
      
isLocal

      setting needs modification, it is recommended to do so once in the
      
$.ajaxSetup()

      method. (version added: 1.5.1)
    • jsonpOverride the callback function name in a JSONP request. This value will be used instead of ‘callback’ in the ‘callback=?’ part of the query string in the url. So
      
{jsonp:'onJSONPLoad'}

      would result in
      
'onJSONPLoad=?'

      passed to the server. As of jQuery 1.5, setting the
      
jsonp

      option to
      
false

      prevents jQuery from adding the “?callback” string to the URL or attempting to use “=?” for transformation. In this case, you should also explicitly set the
      
jsonpCallback

      setting. For example,
      
{ jsonp: false, jsonpCallback: "callbackName" }

      . If you don’t trust the target of your Ajax requests, consider setting the
      
jsonp

      property to
      
false

      for security reasons.
    • jsonpCallbackSpecify the callback function name for a JSONP request. This value will be used instead of the random name automatically generated by jQuery. It is preferable to let jQuery generate a unique name as it’ll make it easier to manage the requests and provide callbacks and error handling. You may want to specify the callback when you want to enable better browser caching of GET requests. As of jQuery 1.5, you can also use a function for this setting, in which case the value of
      
jsonpCallback

      is set to the return value of that function.
    • method (default:
      
'GET'

      )The HTTP method to use for the request (e.g.
      
"POST"

      ,
      
"GET"

      ,
      
"PUT"

      ). (version added: 1.9)
    • mimeTypeA mime type to override the XHR mime type. (version added: 1.5.1)
    • passwordA password to be used with XMLHttpRequest in response to an HTTP access authentication request.
    • processData (default:
      
true

      )By default, data passed in to the
      
data

      option as an object (technically, anything other than a string) will be processed and transformed into a query string, fitting to the default content-type “application/x-www-form-urlencoded”. If you want to send a DOMDocument, or other non-processed data, set this option to
      
false

      .
    • scriptAttrsDefines an object with additional attributes to be used in a “script” or “jsonp” request. The key represents the name of the attribute and the value is the attribute’s value. If this object is provided it will force the use of a script-tag transport. For example, this can be used to set
      
nonce

      ,
      
integrity

      , or
      
crossorigin

      attributes to satisfy Content Security Policy requirements. (version added: 3.4)
    • scriptCharsetOnly applies when the “script” transport is used. Sets the
      
charset

      attribute on the script tag used in the request. Used when the character set on the local page is not the same as the one on the remote script. Alternatively, the
      
charset

      attribute can be specified in
      
scriptAttrs

      instead, which will also ensure the use of the “script” transport.
    • statusCode (default:
      
{}

      )

      An object of numeric HTTP codes and functions to be called when the response has the corresponding code. For example, the following will alert when the response status is a 404:

      1234567
      
$.ajax({


statusCode: {


404: function() {


alert( "page not found" );


});


      If the request is successful, the status code functions take the same parameters as the success callback; if it results in an error (including 3xx redirect), they take the same parameters as the

      (version added: 1.5)
      
error

      callback.

    • successA function to be called if the request succeeds. The function gets passed three arguments: The data returned from the server, formatted according to the
      
dataType

      parameter or the
      
dataFilter

      callback function, if specified; a string describing the status; and the
      
jqXHR

      (in jQuery 1.4.x, XMLHttpRequest) object. As of jQuery 1.5, the success setting can accept an array of functions. Each function will be called in turn. This is an Ajax Event.
    • timeoutType: NumberSet a timeout (in milliseconds) for the request. A value of 0 means there will be no timeout. This will override any global timeout set with $.ajaxSetup(). The timeout period starts at the point the
      
$.ajax

      call is made; if several other requests are in progress and the browser has no connections available, it is possible for a request to time out before it can be sent. In jQuery 1.4.x and below, the XMLHttpRequest object will be in an invalid state if the request times out; accessing any object members may throw an exception. In Firefox 3.0+ only, script and JSONP requests cannot be cancelled by a timeout; the script will run even if it arrives after the timeout period.
    • traditionalSet this to
      
true

      if you wish to use the traditional style of param serialization.
    • type (default:
      
'GET'

      )An alias for
      
method

      . You should use
      
type

      if you’re using versions of jQuery prior to 1.9.0.
    • url (default:
      
The current page

      )A string containing the URL to which the request is sent.
    • usernameA username to be used with XMLHttpRequest in response to an HTTP access authentication request.
    • xhr (default:
      
ActiveXObject when available (IE), the XMLHttpRequest otherwise

      )Type: Function()Callback for creating the XMLHttpRequest object. Defaults to the ActiveXObject when available (IE), the XMLHttpRequest otherwise. Override to provide your own implementation for XMLHttpRequest or enhancements to the factory.
    • xhrFields

      An object of fieldName-fieldValue pairs to set on the native

      
XHR

      object. For example, you can use it to set
      
withCredentials

      to
      
true

      for cross-domain requests if needed.123456
      
$.ajax({


url: a_cross_domain_url,


xhrFields: {


withCredentials: true


});


      In jQuery 1.5, the

      (version added: 1.5.1)
      
withCredentials

      property was not propagated to the native
      
XHR

      and thus CORS requests requiring it would ignore this flag. For this reason, we recommend using jQuery 1.5.1+ should you require the use of it.

The

$.ajax()

function underlies all Ajax requests sent by jQuery. It is often unnecessary to directly call this function, as several higher-level alternatives like

$.get()

and

.load()

are available and are easier to use. If less common options are required, though,

$.ajax()

can be used more flexibly.

At its simplest, the

$.ajax()

function can be called with no arguments:

Note: Default settings can be set globally by using the

$.ajaxSetup()

function.

This example, using no options, loads the contents of the current page, but does nothing with the result. To use the result, you can implement one of the callback functions.

The jqXHR Object

The jQuery XMLHttpRequest (jqXHR) object returned by

$.ajax()

as of jQuery 1.5 is a superset of the browser’s native XMLHttpRequest object. For example, it contains

responseText

and

responseXML

properties, as well as a

getResponseHeader()

method. When the transport mechanism is something other than XMLHttpRequest (for example, a script tag for a JSONP request) the

jqXHR

object simulates native XHR functionality where possible.

As of jQuery 1.5.1, the

jqXHR

object also contains the

overrideMimeType()

method (it was available in jQuery 1.4.x, as well, but was temporarily removed in jQuery 1.5). The

.overrideMimeType()

method may be used in the

beforeSend()

callback function, for example, to modify the response content-type header:

10 11

The jqXHR objects returned by

$.ajax()

as of jQuery 1.5 implement the Promise interface, giving them all the properties, methods, and behavior of a Promise (see Deferred object for more information). These methods take one or more function arguments that are called when the

$.ajax()

request terminates. This allows you to assign multiple callbacks on a single request, and even to assign callbacks after the request may have completed. (If the request is already complete, the callback is fired immediately.) Available Promise methods of the jqXHR object include:

• jqXHR.done(function( data, textStatus, jqXHR ) {});

  An alternative construct to the success callback option, refer to

  
deferred.done()

  for implementation details.

• jqXHR.fail(function( jqXHR, textStatus, errorThrown ) {});

  An alternative construct to the error callback option, the

  
.fail()

  method replaces the deprecated
  
.error()

  method. Refer to
  
deferred.fail()

  for implementation details.

• jqXHR.always(function( data|jqXHR, textStatus, jqXHR|errorThrown ) { }); (added in jQuery 1.6)

  An alternative construct to the complete callback option, the

  
.always()

  method replaces the deprecated
  
.complete()

  method.

  In response to a successful request, the function’s arguments are the same as those of

  
.done()

  : data, textStatus, and the jqXHR object. For failed requests the arguments are the same as those of
  
.fail()

  : the jqXHR object, textStatus, and errorThrown. Refer to
  
deferred.always()

  for implementation details.

• jqXHR.then(function( data, textStatus, jqXHR ) {}, function( jqXHR, textStatus, errorThrown ) {});

  Incorporates the functionality of the

  
.done()

  and
  
.fail()

  methods, allowing (as of jQuery 1.8) the underlying Promise to be manipulated. Refer to
  
deferred.then()

  for implementation details.

Deprecation Notice: The

jqXHR.success()

,

jqXHR.error()

, and

jqXHR.complete()

callbacks are removed as of jQuery 3.0. You can use

jqXHR.done()

,

jqXHR.fail()

, and

jqXHR.always()

instead.

10 11 12 13 14 15 16 17 18 19

The

this

reference within all callbacks is the object in the

context

option passed to

$.ajax

in the settings; if

context

is not specified,

this

is a reference to the Ajax settings themselves.

For backward compatibility with

XMLHttpRequest

, a

jqXHR

object will expose the following properties and methods:

• 
readyState

• 
responseXML

  and/or
  
responseText

  when the underlying request responded with xml and/or text, respectively
• 
status

• 
statusText

  (may be an empty string in HTTP/2)
• 
abort( [ statusText ] )

• 
getAllResponseHeaders()

  as a string
• 
getResponseHeader( name )

• 
overrideMimeType( mimeType )

• 
setRequestHeader( name, value )

  which departs from the standard by replacing the old value with the new one rather than concatenating the new value to the old one
• 
statusCode( callbacksByStatusCode )


No

onreadystatechange

mechanism is provided, however, since

done

,

fail

,

always

, and

statusCode

cover all conceivable requirements.

Callback Function Queues

The

beforeSend

,

error

,

dataFilter

,

success

and

complete

options all accept callback functions that are invoked at the appropriate times.

As of jQuery 1.5, the

fail

and

done

, and, as of jQuery 1.6,

always

callback hooks are first-in, first-out managed queues, allowing for more than one callback for each hook. See Deferred object methods, which are implemented internally for these

$.ajax()

callback hooks.

The callback hooks provided by

$.ajax()

are as follows:

1. 
beforeSend

   callback option is invoked; it receives the
   
jqXHR

   object and the
   
settings

   object as parameters.
2. 
error

   callback option is invoked, if the request fails. It receives the
   
jqXHR

   , a string indicating the error type, and an exception object if applicable. Some built-in errors will provide a string as the exception object: “abort”, “timeout”, “No Transport”.
3. 
dataFilter

   callback option is invoked immediately upon successful receipt of response data. It receives the returned data and the value of
   
dataType

   , and must return the (possibly altered) data to pass on to
   
success

   .
4. 
success

   callback option is invoked, if the request succeeds. It receives the returned data, a string containing the success code, and the
   
jqXHR

   object.
5. Promise callbacks —
   
.done()

   ,
   
.fail()

   ,
   
.always()

   , and
   
.then()

   — are invoked, in the order they are registered.
6. 
complete

   callback option fires, when the request finishes, whether in failure or success. It receives the
   
jqXHR

   object, as well as a string containing the success or error code.

Data Types

Different types of response to

$.ajax()

call are subjected to different kinds of pre-processing before being passed to the success handler. The type of pre-processing depends by default upon the Content-Type of the response, but can be set explicitly using the

dataType

option. If the

dataType

option is provided, the Content-Type header of the response will be disregarded.

The available data types are

text

,

html

,

xml

,

json

,

jsonp

, and

script

.

If

text

or

html

is specified, no pre-processing occurs. The data is simply passed on to the success handler, and made available through the

responseText

property of the

jqXHR

object.

If

xml

is specified, the response is parsed using

jQuery.parseXML

before being passed, as an

XMLDocument

, to the success handler. The XML document is made available through the

responseXML

property of the

jqXHR

object.

If

json

is specified, the response is parsed using

jQuery.parseJSON

before being passed, as an object, to the success handler. The parsed JSON object is made available through the

responseJSON

property of the

jqXHR

object.

If

script

is specified,

$.ajax()

will execute the JavaScript that is received from the server before passing it on to the success handler as a string.

If

jsonp

is specified,

$.ajax()

will automatically append a query string parameter of (by default)

callback=?

to the URL. The

jsonp

and

jsonpCallback

properties of the settings passed to

$.ajax()

can be used to specify, respectively, the name of the query string parameter and the name of the JSONP callback function. The server should return valid JavaScript that passes the JSON response into the callback function.

$.ajax()

will execute the returned JavaScript, calling the JSONP callback function, before passing the JSON object contained in the response to the

$.ajax()

success handler.

For more information on JSONP, see the original post detailing its use.

Sending Data to the Server

By default, Ajax requests are sent using the GET HTTP method. If the POST method is required, the method can be specified by setting a value for the

type

option. This option affects how the contents of the

data

option are sent to the server. POST data will always be transmitted to the server using UTF-8 charset, per the W3C XMLHTTPRequest standard.

The

data

option can contain either a query string of the form

key1=value1&key2=value2

, or an object of the form

{key1: 'value1', key2: 'value2'}

. If the latter form is used, the data is converted into a query string using

jQuery.param()

before it is sent. This processing can be circumvented by setting

processData

to

false

. The processing might be undesirable if you wish to send an XML object to the server; in this case, change the

contentType

option from

application/x-www-form-urlencoded

to a more appropriate MIME type.

Advanced Options

The

global

option prevents handlers registered for the

ajaxSend

,

ajaxError

, and similar events from firing when this request would trigger them. This can be useful to, for example, suppress a loading indicator that was implemented with an

ajaxSend

handler if the requests are frequent and brief. With cross-domain script and JSONP requests, the global option is automatically set to

false

. See the descriptions of these methods below for more details.

If the server performs HTTP authentication before providing a response, the user name and password pair can be sent via the

username

and

password

options.

Ajax requests are time-limited, so errors can be caught and handled to provide a better user experience. Request timeouts are usually either left at their default or set as a global default using

$.ajaxSetup()

rather than being overridden for specific requests with the

timeout

option.

By default, requests are always issued, but the browser may serve results out of its cache. To disallow use of the cached results, set

cache

to

false

. To cause the request to report failure if the asset has not been modified since the last request, set

ifModified

to

true

.

The

scriptCharset

allows the character set to be explicitly specified for requests that use a

Create Datatable from json data returned from Ajax success

Create Datatable from json data returned from Ajax success

I have an ajax script which sends html form data to backend flask server, the backend server interacts with a database then returns some data as json. How to convert the returned json object to datatable?


$(document).ready(function() { $("#submit").click(function(event) { $.ajax({ type: 'POST', url: '/query_database', data: $('#myform').serialize(), success: function(data) { //should create datatable from data }, error: function(error) { $('#result').html(error); } }); event.preventDefault(); }); });


data in the success is json of this format:


[ {"id": 1, "city": "ny" }, {"id": 2, "city": "ber" }, {"id": 3, "city": "la" }, {"id": 4, "city": "amstd" } ]


Answers

• J33g73 Posts: 6Questions: 0Answers: 0

  You can use DataTables to initiate the ajax call. I’d recommend reading the documentation first on how to setup the table and columns to assign the returned data into the columns.

• Hi @doughng ,

  Yep, as @J33g73 said, the best is to let DataTables manage the Ajax requests, as in this example here. This section here has other examples that may help.

  If that’s not possible for whatever reason, you could just parse the JSON respond and load into an existing table with

  
rows.add()

  .

  Hope that helps,

  Cheers,

  Colin

JSON or JavaScript Object Notation is a widely used transmitting format for passing data between a server and a web application. It is the most efficient way to return multiple values as a response from the PHP script to jQuery.

It is not possible to return an array directly from AJAX, and it must be converted into a valid format. You can either use the XML or JSON format.

In the tutorial demonstration, I will return an array of users from AJAX, while return converts the array into JSON format using the json_encode() function in the PHP.

Based on response show data in tabular format.

Jquery Parse Json on ajax success [duplicate]

Solution 1:

It is necessary to properly parse your JSON before utilizing it.

You have the option to specify a dataType while making a request, which allows jQuery to automatically parse the response in JSON format.


$.ajax({ type: "POST", url: "ajax.php", dataType: 'json',


Or, you can parse it yourself –


success: function(data){ var json_x = $.parseJSON(data);


Solution 2:

You could try this:


var data=$.ajax({ type: "POST", url: 'ajax.php', data: { data:str }, async: false, dataType: 'json' }); var msg= data.responseText; msg=jQuery.parseJSON(msg);


Typically, I transmit an array or trigger the ‘error’ message from my PHP page.


if(msg=='error') { /* do something */ } else // use the data


This works with jquery 1.6->1.8

The format I would suggest is to avoid using async in versions of jQuery after 1.8, as it has been deprecated.


$.ajax({ type: "POST", url: 'ajax.php', data: { data:str }, dataType: 'json', ).done(function(data) { // do something with the data }) .fail(function() { // give appropriate message })


jQuery.ajax()

Solution 3:

In your example,

data

is a string. To retrieve data via AJAX and parse the resulting string as JSON, use jQuery.getJSON(). However, since you cannot do a POST-request with getJSON, use

.ajax

instead with the appropriate dataType. The resulting data will be an array (or an array-like object) even with

getJSON

, which has no accessible methods or variables with dot-notation. Access it through

data['a']

.


$.ajax({ dataType: "json", type: "POST", url: "ajax.php", data: str, success: function(data){ var json_x = data; alert(json_x['firstName2']); $('#result').html(json_x['firstName2']); $('#result2').html(json_x['b']); } });


Database connection

Create

config.php

for database configuration.

jQuery – Send AJAX Request and handle JSON Response

An AJAX GET request is sent to

ajaxfile.php

once the document has reached the ready state. A new row is added to the table with the ID

userTable

after a successful callback, which loops through all response values.

In AJAX request set

dataType

to

'json'

to handle the JSON response or you can use

JSON.parse()

to convert returned JSON string to an object.

$(document).ready(function(){ $.ajax({ url: ‘ajaxfile.php’, type: ‘get’, dataType: ‘JSON’, success: function(response){ var len = response.length; for(var i=0; i

” + (i+1) + “” + ”

” + username + ”

” + ”

” + name + ”

” + ”

” + email + ”

” + “”; $(“#userTable tbody”).append(tr_str); } } }); });

Create a Table

I am using

users

table in the example.

CREATE TABLE `users` ( `id` int(11) NOT NULL PRIMARY KEY AUTO_INCREMENT, `username` varchar(100) NOT NULL, `name` varchar(100) NOT NULL, `email` varchar(100) NOT NULL, `timestamp` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP ) ENGINE=InnoDB DEFAULT CHARSET=latin1;

Conclusion

The PHP array must be encoded into JSON using the json_encode() function before a response can be returned. To handle returned JSON response you can either set dataType to ‘json’ or use JSON.parse() function.

With practice and further exploration, you can use these concepts to build more advanced and interactive web applications.

Additionally, you may refer to a tutorial to learn how to send a JavaScript array with an AJAX request.

If you found this tutorial helpful then don’t forget to share.

I have a problem with the success of my jquery funcion.

This is the script in js


$.ajax({ type: "POST", url: "filtra.php", dataType: 'json', data: "livello:"+ liv+"&materia:"+mat, success: function (data) { for ( var x = 0; x < data.length; x++ ) { content = data[x].ID; alert(content); } } });


And this is the php page.



getMessage();} $str="SELECT * FROM quesito"; if($liv!="Tutte"){$str.=" WHERE '$liv'=Livello ";} if($mat!="Tutte" && $liv!="Tutte"){$str.="AND '$mat'=Materia ";} else if($mat!="Tutte" && $liv=="Tutte") {$str.=" WHERE'$mat'=Materia ";} $sql = $pdo->prepare($str); $sql->execute(); $res = $sql->fetchAll(); echo json_encode($res); } ?>


There aren’t any return.. Thanks for replies.

Returning JSON Object via Ajax Success Handler

To solve the problem, I modified the ajax function of Jquery to work independently from Jquery. Instead of using Jquery’s ajax function, I created three alternative solutions. The first solution involves adjusting the variable scope inside the post method. The second solution involves making some changes to the code structure. The third solution requires using the ajax string syntax provided below.

• Use Ajax Success Handler to return JSON object
• Converting AJAX return data to JSON
• How to convert jquery ajax to native javascript?
• How to convert ajax retrieved object to string in jquery
• How to convert JSON to JavaScript using jQuery?
• How to get JSON response after Ajax success function?
• Why can’t I get JSON to work with Ajax?
• How to use Ajax success function in jQuery?

AJAX – Returning JSON Response from PHP

Create

ajaxfile.php

to handle AJAX requests. Inside the file, create an array called

$return_arr

to store the response that will be sent back to the client.

Next, fetch all records from the

users

table and loop through them. For each user, add their details (id, username, name, and email) to the

$return_arr

array.

Finally, using

json_encode()

function convert

$return_arr

Array to JSON format before returning it to the client side.

$id, “username” => $username, “name” => $name, “email” => $email); } // Encoding array in JSON format echo json_encode($return_arr);

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