Difference Between getJSON and ajax in jQuery

Question

I am calling an ASP NET MVC action  public JsonResult GetPatient string patientID          from JavaScript using jQuery  The following call works    getJSON    Services GetPatient     patientID   1     function jsonData      alert jsonData         whereas this one does not     ajax     type   POST     url    Services GetPatient     data    patientID   1       contentType   application json  charset utf-8     dataType   json     success  function jsonData        alert jsonData          error  function         alert  Error loading PatientID     id             Both reach the action method  but the patientID value is null w  the   ajax call  I d like to use the   ajax call for some of the advanced callbacks   Any thoughts appreciated

User · Answer

There is lots of confusion in some of the function of jquery like $.ajax, $.get, $.post, $.getScript, $.getJSON that what is the difference among them which is the best, which is the fast, which to use and when so below is the description of them to make them clear and to get rid of this type of confusions.

$.getJSON() function is a shorthand Ajax function (internally use $.get() with data type script), which is equivalent to below expression, Uses some limited criteria like Request type is GET and data Type is json.

Read More .. jquery-post-vs-get-vs-ajax

User · Answer

The only difference I see is that getJSON performs a GET request instead of a POST

User · Answer

contentType   application json  charset utf-8    Is not good  At least it doesnt work for me  The other syntax is ok  The parameter you supply is in the right format

User · Answer

with   getJSON    there is  no any error callback only you can track succeed callback and there no standard setting supported like beforeSend  statusCode  mimeType etc  if you want it use   ajax

User · Answer

Replace  data    patientID   1       with  data      patientID    1        Further reading  3 mistakes to avoid when using jQuery with ASP NET

User · Answer

getJson is simply a wrapper around  ajax but it provides a simpler method signature as some of the settings are defaulted e g dataType to json  type to get etc  N B  load   get and  post are also simple wrappers around the  ajax method

User · Answer

Content-type  You don t need to specify that content-type on calls to MVC controller actions   The special  application json  charset utf-8  content-type is only necessary when calling ASP NET AJAX  ScriptServices  and page methods   jQuery s default contentType of  application x-www-form-urlencoded  is appropriate for requesting an MVC controller action   More about that content-type here   JSON Hijacking and How ASP NET AJAX 1 0 Avoids these Attacks  Data  The data is correct as you have it   By passing jQuery a JSON object  as you have  it will be serialized as patientID 1 in the POST data   This standard form is how MVC expects the parameters   You only have to enclose the parameters in quotes like     patientID    1    when you re using ASP NET AJAX services   They expect a single string representing a JSON object to be parsed out  rather than the individual variables in the POST data   JSON  It s not a problem in this specific case  but it s a good idea to get in the habit of quoting any string keys or values in your JSON object   If you inadvertently use a JavaScript reserved keyword as a key or value in the object  without quoting it  you ll run into a confusing-to-debug problem   Conversely  you don t have to quote numeric or boolean values   It s always safe to use them directly in the object   So  assuming you do want to POST instead of GET  your   ajax   call might look like this     ajax     type   POST     url    Services GetPatient     data     patientID    1      dataType   json     success  function jsonData        alert jsonData          error  function         alert  Error loading PatientID     id

[asp.net-mvc] Difference Between $.getJSON() and $.ajax() in jQuery

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