Differences between contentType and dataType in jQuery ajax function

Question

I have the following Jquery callback function and I have a litle doubt about it  I don t know very well Jquery       form readXmlForm   submit function            Riferimento all elemento form che ha scatenato il submit      var form     this          Variabile che contiene il riferimento al bottone clickato      var button   form children   first           ajax             Viene eseguita la chiamata AJAX          type   POST      Tipo di richiesta  POST             URL verso quale viene inviata la richiesta         url  form attr  action                   Dati XML inviati           data    lt  xml version   1 0   encoding   UTF-8   standalone   yes    gt  lt javaBean gt  lt foo gt bar lt  foo gt  lt fruit gt apple lt  fruit gt  lt  javaBean gt                Tipo di media type accettabile dalla response           contentType   application xml            dataType   text             success  function text                 MvcUtil showSuccessResponse text  button                         error  function xhr                 MvcUtil showErrorResponse xhr responseText  button                        As you can see this function simply execute an AJAX Request to the backend setting the parameter for this request   I have set that I am sending the request towards an URL  that the request is a POST request and that the data that I am sending are the following string    barapple   I have some difficulties to understand what is the differences between contentType and dataType  I think that contentType specify the type of data that are acceptable recived in the HTTP Response  is it right   And dataType  What say  The type of data that I am sending in the HTTP Request   In this case is is  text  because I am sending a textual string that rappresent XML code

User · Answer

In English    ContentType  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  Accepts  The content type sent in the request header that tells the server what kind of response it will accept in return  Depends on DataType  DataType  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  Can be text  xml  html  script  json  jsonp

User · Answer

From the documentation   contentType  default   application x-www-form-urlencoded  charset UTF-8   Type  String When sending data to the server  use this content type  Default is  quot application x-www-form-urlencoded  charset UTF-8 quot   which is fine for most cases  If you explicitly pass in a content-type to   ajax    then it ll always be sent to the server  even if no data is sent   If no charset is specified  data will be transmitted to the server using the server s default charset  you must decode this appropriately on the server side   and   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    They re essentially the opposite of what you thought they were

[javascript] Differences between contentType and dataType in jQuery ajax function

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