Description:Perform an asynchronous HTTP (Ajax) request.

• version added:1.5jQuery.ajax( url [, settings ] )

  • url
    Type:String
    A string containing the URL to which the request is sent.
  • settings
    Type:PlainObject
    A set of key/value pairs that configure the Ajax request. All settings are optional. A default can be set for any option with$.ajaxSetup(). SeejQuery.ajax( settings ) below for a complete list of all settings.

• version added:1.0jQuery.ajax( [settings ] )

  • settings
    Type:PlainObject
    A 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)
      Type:PlainObject
      A set of key/value pairs that map a givendataType to its MIME type, which gets sent in theAccept request header. This header tells the server what kind of response it will accept in return. For example, the following defines a custom typemycustomtype to be sent with the request:

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      $.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' });

      Note: You will need to specify a complementary entry for this type inconverters for this to work properly.
    • async (default:true)
      Type:Boolean
      By default, all requests are sent asynchronously (i.e. this is set totrue by default). If you need synchronous requests, set this option tofalse. Cross-domain requests anddataType: "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 ofasync: 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 asjqXHR.done().
    • beforeSend
      Type: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 anAjax Event. Returningfalse in thebeforeSend function will cancel the request.As of jQuery 1.5, thebeforeSend option will be called regardless of the type of request.
    • cache (default:true, false for dataType 'script' and 'jsonp')
      Type:Boolean
      If set tofalse, it will force requested pages not to be cached by the browser.Note: Settingcache 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.
    • complete
      Type:Function(jqXHR jqXHR,String textStatus )
      A function to be called when the request finishes (aftersuccess anderror 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, thecomplete setting can accept an array of functions. Each function will be called in turn. This is anAjax Event.
    • contents
      Type:PlainObject
      An 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')
      Type:Boolean orString
      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 passfalse 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 thanapplication/x-www-form-urlencoded,multipart/form-data, ortext/plain will trigger the browser to send a preflight OPTIONS request to the server.
    • context
      Type:PlainObject
      This 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 thecomplete callback of a request, like so:

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      $.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})
      Type:PlainObject
      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)
      Type:Boolean
      If you wish to force a crossDomain request (such as JSONP) on the same domain, set the value of crossDomain totrue. This allows, for example, server-side redirection to another domain. (version added:1.5)
    • data
      Type:PlainObject orString orArray

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

      Whendata is an object, jQuery generates the data string from the object's key/value pairs unless theprocessData option is set tofalse. 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 thetraditional setting (described below). For example,{ a: [1,2] } becomes the string"a%5B%5D=1&a%5B%5D=2" with the defaulttraditional: false setting.

      Whendata is passed as a string it shouldalready be encoded using the correct encoding forcontentType, which by default isapplication/x-www-form-urlencoded.

      In requests withdataType: "json" ordataType: "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).

    • dataFilter
      Type:Function(String data,String type )=>Anything
      A 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))
      Type:String
      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 thecache option is set totrue.Note: This will turn POSTs into GETs for remote-domain requests. Prior to jQuery 3.5.0, unsuccessful HTTP responses with a scriptContent-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 usingJSONP unless the request includesjsonp: 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 ofnull or{} instead. (Seejson.org for more information on proper JSON formatting.)
      • "jsonp": Loads in a JSON block usingJSONP. 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 thecache option is set totrue.
      • "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.
    • error
      Type:Function(jqXHR jqXHR,String textStatus,String errorThrown )
      A 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 (besidesnull) 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, theerror 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 anAjax Event.
    • global (default:true)
      Type:Boolean
      Whether to trigger global Ajax event handlers for this request. The default istrue. Set tofalse to prevent the global handlers likeajaxStart orajaxStop from being triggered. This can be used to control variousAjax Events.
    • headers (default:{})
      Type:PlainObject
      An object of additional header key/value pairs to send along with requests using the XMLHttpRequest transport. The headerX-Requested-With: XMLHttpRequest is always added, but its defaultXMLHttpRequest value can be changed here. Values in theheaders setting can also be overwritten from within thebeforeSend function. (version added:1.5)
    • ifModified (default:false)
      Type:Boolean
      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 isfalse, 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)
      Type:Boolean
      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, andwidget. If theisLocal setting needs modification, it is recommended to do so once in the$.ajaxSetup() method. (version added:1.5.1)
    • jsonp
      Type:String orBoolean
      Override 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 thejsonp option tofalse prevents jQuery from adding the "?callback" string to the URL or attempting to use "=?" for transformation. In this case, you should also explicitly set thejsonpCallback setting. For example,{ jsonp: false, jsonpCallback: "callbackName" }. If you don't trust the target of your Ajax requests, consider setting thejsonp property tofalse for security reasons.
    • jsonpCallback
      Type:String orFunction()
      Specify 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 ofjsonpCallback is set to the return value of that function.
    • method (default:'GET')
      Type:String
      The HTTP method to use for the request (e.g."POST","GET","PUT"). (version added:1.9)
    • mimeType
      Type:String
      A mime type to override theXHR mime type. (version added:1.5.1)
    • password
      Type:String
      A password to be used with XMLHttpRequest in response to an HTTP access authentication request.
    • processData (default:true)
      Type:Boolean
      By default, data passed in to thedata 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 tofalse.
    • scriptAttrs
      Type:PlainObject
      Defines 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 setnonce,integrity, orcrossorigin attributes to satisfy Content Security Policy requirements. (version added:3.4)
    • scriptCharset
      Type:String
      Only applies when the "script" transport is used. Sets thecharset 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, thecharset attribute can be specified inscriptAttrs instead, which will also ensure the use of the "script" transport.
    • statusCode (default:{})
      Type:PlainObject

      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:

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      $.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 redirects to another domain), they take the same parameters as theerror callback. 3xx redirects to the same domain are handled by the browser and are not controlled by jQuery.

      (version added:1.5)
    • success
      Type:Function(Anything data,String textStatus,jqXHR jqXHR )
      A function to be called if the request succeeds. The function gets passed three arguments: The data returned from the server, formatted according to thedataType parameter or thedataFilter callback function, if specified; a string describing the status; and thejqXHR (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 anAjax Event.
    • timeout
      Type:Number
      Set 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.
    • traditional
      Type:Boolean
      Set this totrue if you wish to use the traditional style ofparam serialization.
    • type (default:'GET')
      Type:String
      An alias formethod. You should usetype if you're using versions of jQuery prior to 1.9.0.
    • url (default:The current page)
      Type:String
      A string containing the URL to which the request is sent.
    • username
      Type:String
      A 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
      Type:PlainObject

      An object of fieldName-fieldValue pairs to set on the nativeXHR object. For example, you can use it to setwithCredentials totrue for cross-domain requests if needed.

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      $.ajax({ url: a_cross_domain_url, xhrFields: { withCredentials:true } });

      In jQuery 1.5, thewithCredentials property was not propagated to the nativeXHR 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.

      (version added:1.5.1)

$.ajax();

$.ajax({
url:"https://fiddle.jshell.net/favicon.png",
beforeSend:function( xhr){
    xhr.overrideMimeType("text/plain; charset=x-user-defined" );
  }
})
  .done(function( data){
if (console &&console.log ) {
console.log("Sample of data:", data.slice(0,100 ) );
    }
  });

// Assign handlers immediately after making the request,
// and remember the jqXHR object for this request
var jqxhr = $.ajax("example.php" )
  .done(function(){
    alert("success" );
  })
  .fail(function(){
    alert("error" );
  })
  .always(function(){
    alert("complete" );
  });
// Perform other work here ...
// Set another completion function for the request above
jqxhr.always(function(){
  alert("second complete" );
});

$.ajaxSetup({
contents: {
mycustomtype:/mycustomtype/
  },
converters: {
"mycustomtype json":function( result){
// Do stuff
return newresult;
    }
  }
});

$.ajaxSetup({
contents: {
mycustomtype:/mycustomtype/
  },
converters: {
"text mycustomtype":true,
"mycustomtype json":function( result){
// Do stuff
return newresult;
    }
  }
});

Additional Notes:

$.ajax({
method:"POST",
url:"some.php",
data: {name:"John",location:"Boston" }
})
  .done(function( msg){
    alert("Data Saved: " + msg );
  });

$.ajax({
url:"test.html",
cache:false
})
  .done(function( html){
    $("#results" ).append( html );
  });

var xmlDocument = [create xmldocument];
var xmlRequest = $.ajax({
url:"page.php",
processData:false,
data: xmlDocument
});
xmlRequest.done( handleResponse );

var menuId = $("ul.nav" ).first().attr("id" );
var request = $.ajax({
url:"script.php",
method:"POST",
data: {id : menuId },
dataType:"html"
});
request.done(function( msg){
  $("#log" ).html( msg );
});
request.fail(function( jqXHR, textStatus){
  alert("Request failed: " + textStatus );
});

$.ajax({
method:"GET",
url:"test.js",
dataType:"script"
});