.ajax JSONP parsererror

Question

我正在嘗試使用ajax調用來從Web API帶回數據。我寫了2個類似的功能，都沒有工作。我可以看到數據通過Fiddler返回，但它不會進入成功調用，對於以下兩個函數。我究竟做錯了什麼？數據在Fiddler的兩個函數中都會返回，但它不會成功。

這裏是嘗試1：

function PopulateDivisions() 
{ 
    $.support.cors=true; 


    $.ajax({ 
     type:'GET', 
     url:'http://IP/Service/api/DivisionSearch/GetAllDivisions', 
     data: {}, 
     contentType: 'application/json; charset=utf-8', 
     dataType: 'jsonp', 

     success: function(data) { 

       alert(data); 

       $("#divisionSelect").append($('<option></option>').val("-99").html("Select One")); 
      $.each(data, function(i, item){ 
       $("#divisionSelect").append($('<option></option>').val(item.Name).html(item.Name)); 
      }); 
     }, 
     error: function(xhrequest, ErrorText, thrownError) { 
      alert("Original: " + thrownError + " : " + ErrorText); 
     } 
    }); 

} 

錯誤：jQuery19102671239298189216_1382022403977不叫：解析錯誤

這裏是提琴手是表示數據傷愈復出：

[{"Id":1,"Description":"Executive","Name":"Executive "},{"Id":2,"Description":"ASD","Name":"Administrative Services Division "},{"Id":3,"Description":"COM","Name":"Communications "},{"Id":4,"Description":"CP","Name":"Contracts and Procurement "},{"Id":5,"Description":"PMD","Name":"Program Management Division "},{"Id":6,"Description":"RED","Name":"Research and Evaluation Division "},{"Id":7,"Description":"IT","Name":"Information Technology "}] 

這裏是嘗試＃ 2：

function PopulateDivisions2() 
{ 


    $.support.cors=true; 


    $.ajax({ 
     type:'GET', 
     url:'http://IP/Service/api/DivisionSearch/GetAllDivisionsJsonP', 
     data: {}, 
     contentType: 'application/json; charset=utf-8', 
     dataType: 'jsonp', 
     jsonp: false, 
     jsonpCallback: "myJsonMethod", 

     success: function(data) { 
       //data = JSON.parse(data): 
       alert(data); 

       $("#divisionSelect").append($('<option></option>').val("-99").html("Select One")); 
      $.each(data, function(i, item){ 
       $("#divisionSelect").append($('<option></option>').val(item.Name).html(item.Name)); 
      }); 
     }, 
     error: function(xhrequest, ErrorText, thrownError) { 
      alert("PopulateDivisions2: " + thrownError + " : " + ErrorText); 
     } 

    }); 

} 

錯誤：myJsonMethod不叫：parsererror

這裏的數據顯示提琴手是回來了：

"myJsonMethod([{\"Id\":1,\"Description\":\"Executive\",\"Name\":\"Executive \"},{\"Id\":2,\"Description\":\"ASD\",\"Name\":\"Administrative Services Division \"},{\"Id\":3,\"Description\":\"COM\",\"Name\":\"Communications \"},{\"Id\":4,\"Description\":\"CP\",\"Name\":\"Contracts and Procurement \"},{\"Id\":5,\"Description\":\"PMD\",\"Name\":\"Program Management Division \"},{\"Id\":6,\"Description\":\"RED\",\"Name\":\"Research and Evaluation Division \"},{\"Id\":7,\"Description\":\"IT\",\"Name\":\"Information Technology \"}]);" 

Answer 1

contentType: 'application/json; charset=utf-8'告訴您要發送JSON數據的服務器，但你沒有任何數據你正在發送。試着離開這個設置。

如果你在瀏覽器中瀏覽你的url，你會得到json嗎？

我不知道這是否會事，而是因爲它在jQuery Ajax documentation是This handler is not called for cross-domain script and cross-domain JSONP requests說，我會刪除error設置。

我想嘗試用配置的像這樣的量最少運行此：

$.ajax({ 
    url:'http://IP/Service/api/DivisionSearch/GetAllDivisions', 
    dataType: 'jsonp', 
    success: function(data) { console.log(data); } 
}); 

看看這個作品，然後建立在它之上。如果沒有jsfiddle，很難調試正在發生的事情。

這裏，應該是你的好資源的鏈接：Basic example of using .ajax() with JSONP?

Answer 2

function PopulateDivisions2(){ 
$.support.cors=true; 
$.ajax({ 
    type:'GET', 
    url:'http://IP/Service/api/DivisionSearch/GetAllDivisionsJsonP?callback=?', 
    data: {}, 
    contentType: 'application/json; charset=utf-8', 
    dataType: 'jsonp', 
    jsonpCallback: "myJsonMethod" }); 


function myJsonMethod(data) { 
      //data = JSON.parse(data): 
      alert(data);$("#divisionSelect").append($('<option></option>').val("-99").html("Select One")); 
     $.each(data, function(i, item){ 
      $("#divisionSelect").append($('<option></option>').val(item.Name).html(item.Name)); 
     }); 
    }} 

你可以試試上面的代碼？我已經刪除了成功回調並在查詢字符串中包含了回調。