使用jQuery处理http错误的问题AJAX web服务调用

Question

我正在开发一个jQuery应用程序，在那里我需要捕获HTTP错误以及何时发生。以下是我的片段。

// Function to validate URL 

function validateURL(url) 
{ 
    var pattern = new RegExp(); 
    pattern.compile("^[A-Za-z]+://[A-Za-z0-9-_]+\\.[A-Za-z0-9-_%&\?\/.=]+$"); 
    if (!pattern.test(url)) 
    { 
     return false; 
    } 
    return true; 
} 

// Generic error handler for handling the webservice requests. 
function initWebService(wstype, wsurl,jsonData) 
{ 
    // If the method parameter is not either "GET" or "POST" display an error message to the developer. 

    var msgValidateArgument; 
    var wsCallStatus; 
    var callbackData; 

    if ((arguments[0] != 'GET') && (arguments[0] != 'POST')) 
    { 
     //alert("Invalid"); 
     //alert("You must provide a valid http method in your webservice call."); 
     msgValidateArgument = "You must provide a valid http method in your webservice call."; 
     return msgValidateArgument; 
    } 

    // Making sure whether the developer is passing the required number of parameters. 
    if(arguments.length < 3) 
    { 
     //alert("Some required arguments seems to be missing. Please check your webservice invocation."); 
     msgValidateArgument = "Some required arguments seems to be missing. Please check your webservice invocation."; 
     return msgValidateArgument; 
    } 

    if (!validateURL(arguments[1])) 
    { 
     msgValidateArgument = "You must provide a valid URL in your webservice call."; 
     return msgValidateArgument; 
    } 

    if(arguments[2] != ''){ 
     var response=jQuery.parseJSON(arguments[2]); 
      if(typeof response =='object'){ 
       //It is JSON 
       alert(response.toSource()); 
      } 
      else{ 
      msgValidateArgument = "The JSON data being passed is not in valid JSON format."; 
      return msgValidateArgument; 
     } 
    } 

    // Making the AJAX call with the parameters being passed. The error handler handles some of the possble http error codes as of now. 

    $.ajax({ 
     type: arguments[0], 
     url: arguments[1], 
     data: arguments[2], 
     dataType: 'json', 
     async:false, 
     statusCode:{ 
      404: function(){ 
       alert('Page not found'); 
      }, 
      500: function(){ 
       alert('Page not found'); 
      }, 
      504: function(){ 
       alert('Unknown host'); 
      } 
     }, 
     success: function(data){ 
     //alert('Data being returned from server: ' +data.toSource()); 
     //alert('Data being returned from server: ' +data.toSource()); 
     //alert(data); 
     callbackData = data; 

    } 
    }); 

    return callbackData; 
} 

但是，当我编程修改，并在调用HTML页面中的web服务的URL持有一个错误的值，我能够在Firebug控制台看到一个错误信息，但我的片段似乎没有要抓住这个错误。

例如，在调用GEONames API时，我遇到了在firebug的控制台中声明“需要407授权”。但即使我在错误块中处理状态码，它也不会触发。原因？。

难道我们没有任何有效处理这些HTTP错误的全面解决方案吗？

Answer 1

我认为你的代码有几个问题...首先如何调用handleError？因为你调用一个名为handleError方法，但通过什么...即时假设你使用.ajax()

你应该做的是这样的：

$.ajax({ 
    statusCode: { 
    404: function() { 
     alert('page not found'); 
    }, 
    500: function() { 
     alert('server error'); 
    } 
    }, 
    success : { 
     alert('it working'); 
    }, 
    complete : { 
     alert('im complete'); 
});