JSON/AJAX Helpers

Recently, had an implementation where I needed to implement ASP.Net Web API 2 and accompanied it with Javascript/JQuery AJAX communication.  In doing this i found myself making the same pattern calls with some varying value for certain properties for the AJAX data calls.  As such, i ended up building a few helper functions to simply the inclusion of these various minor quirks based on what was needed.  Below  you will find the various forms.

1:  /*********************************************************************  
2:     @type - dataType, such as 'json', 'xml', 'script', 'jsonp' or 'html'  
3:     @contentType - string value, represents the HTML type of content  
4:           IE: 'application/json; charset=utf-8'  
5:     @url - API URL, such as 'api/tasks' should be constrainted to the   
6:           Web API Controller  
7:     @success - Function(data, status, xhr) handler, The logic to execute  
8:           on a 200 response code  
9:     @data - JSON object, A JSON object of the data to be passed to the   
10:           @url.  
11:     @func - function(xhr, status, err){} handler, the logic to execute  
12:           on an error response from AJAX. Default will be an alert box  
13:           with the xhr.responseText content.  
14:  ----------------------------------------------------------------------  
15:     GetAPI('json', 'application/json', 'api/tasks', function(){...}, {var1:val1, var2:val2, ...}, function(xhr, status, err){} );  
16:  *********************************************************************/  
17:  function GetAPI(type, contentType, url, success, data, func) {  
18:     if (success !== undefined) {  
19:        if (typeof data === undefined) {  
20:           $.ajax({  
21:              type: 'GET',  
22:              dataType: type,  
23:              contentType: contentType,  
24:              url: url,  
25:              success: success,  
26:              error: (typeof func !== 'undefined' && func != null) ? func : AjaxFail  
27:           });  
28:        } else {  
29:           $.ajax({  
30:              type: 'GET',  
31:              data: data,  
32:              dataType: type,  
33:              contentType: contentType,  
34:              url: url,  
35:              success: success,  
36:              error: (typeof func !== 'undefined' && func != null) ? func : AjaxFail  
37:           });  
38:        }  
39:     } else {  
40:        alert("GetAPI function did not have a 'success' function signature declared.");  
41:     }  
42:  }  
43:  function GetJsonUTF8(url, success, data, func) {  
44:     GetAPI('json', 'application/json; charset=utf-8', url, success, data, func);  
45:  }  
46:  /*********************************************************************  
47:     @type - Data Type, such as 'xml', 'json', 'script', 'text', or 'html'  
48:     @contentType - string value, should be closely related to @type.  
49:     @url - API URL, such as 'api/tasks/3/update/rank' should be   
50:           constrainted to the Web API Controller  
51:     @data - (Nullable) A plain object or string that is sent to the server with the   
52:           request.  
53:     @success - a function signature to be executed when the Post is   
54:           successful.  
55:  ----------------------------------------------------------------------  
56:     PostAPI('json', 'application/json', 'api/tasks/1/update/rank/5', json{}, function(){});  
57:  *********************************************************************/  
58:  function PostAPI(type, contentType, url, data, success) {  
59:     if (typeof (success) === 'function') {  
60:        $.ajax({  
61:           type: "POST",  
62:           contentType: contentType,  
63:           dataType: type,  
64:           url: url,  
65:           data: data,  
66:           success: success,  
67:           error: AjaxFail  
68:        });  
69:     }  
70:  }  
71:  function PostJson(url, data, success) {  
72:     PostAPI('json', 'application/json', url, data, success);  
73:  }  
74:  function PostJsonFormData(url, data, success) {  
75:     PostAPI('json', 'application/x-www-form-urlencoded',  
76:        url,  
77:        data,  
78:        success  
79:        );  
80:  }  
81:  function AjaxFail(xhr, status, err) {  
82:     alert(xhr.responseText);  
83:  }