Why does jQuery.ajax() add a parameter to the url?

Posted by FK82 on Stack Overflow See other posts from Stack Overflow or by FK82
Published on 2010-05-01T10:23:40Z Indexed on 2010/05/01 10:27 UTC
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Hi,

I have a data fetching method that uses jQuery.ajax() to fetch xml files.

/*    */data: function() {                                                                                                                                          
                                                                                                                                                                /* debug */try {
        var url = arguments[0] ;                                                                                                                                
        var type = arguments[1] ;                                                                                                                               
        var scope = arguments[2] ;                                                                                                                              
        var callback = arguments[3] ;                                                                                                                           

        var self = this ;                                                                                                                                       
            if(this.cache[url]) {                                                                                                                               
                callback(this.cache[url]) ;                                                                                                                     
            } else if(!this.cache[url]) {                                                                                                                       

                $.ajax({                                                                                                                                        
                    type: "GET" ,                                                                                                                               
                    url: url ,                                                                                                                                  
                    dataType: type ,                                                                                                                            
                    cache: false ,                                                                                                                              
                    success: function(data) {                                                                                                                   

                            if(type == "text/xml") {                                                                                                                                                                                                                                                                                
                                var myJson = AUX.json ;                                                                                                         
                                var jsonString = myJson.build(data,scope,null) ;                                                                                
                                var jsonObject = $.parseJSON(jsonString) ;                                                                                      
                                self.cache[url] = jsonObject ;                                                                                                  
                                callback(url) ;                                                                                                                 

                            } else if(type == "json") {                                                                                                         

                                self.cache[url] = data ;                                                                                                        
                                callback(url) ;                                                                                                                 

                            }                                                                                                                                   

                    } ,                                                                                                                                         
                    error: function() {                                                                                                                         
                        throw "Ajax call failed." ;                                                                                                             
                    }                                                                                                                                           
                }) ;                                                                                                                                            

            }                                                                                                                                                   
                                                                                                                                                                /* debug */} catch(e) {
                                                                                                                                                                /* debug */     alert("- caller: signTutor.data\n- " + e) ;
                                                                                                                                                                /* debug */}
    } ,                                                                                                                                                         

My problem is: jQuery somehow adds a parameter (?_=1272708280072) to the url if there are escaped (hexadecimal notation) or unescaped utf-8 characters outside of the ASCII range -- i believe -- in the file name. It all works well if the file name does not contain characters in that range.

Type is set to xml so there should not be a confusion of types. Headers of the xml files are also set adequately.

I can see from the console that jQuery throws an error, but I'm not sure as to where the problem really is.

Probably a problem with file name formatting, but I did not find any resources on the web as to AJAX file name specifications. Any ideas?

Thanks for you help!

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