javascriptとサーバ2

 ,   IE  XMLHTTP  

                    XMLHTTP    ,           MSXML     XMLHTTP                , XMLHTTP                   XML        http  .   IE   XMLHTTP    ,    ActiveXObject  .

1.       

    var oRequest = new ActiveXObject("Microsoft.XMLHTTP");

    ,XMLHTTP        ,          XMLHTTP    ,         :

function createXMLHTTP(){

   var arr =["MSXML2.XMLHTTP5.0", "MSXML2.XMLHTTP4.0",

             "MSXML2.XMLHTTP3.0", "MSXML2.XMLHTTP",

             "Microsoft.XMLHTTP" ]

  for(var i=0; i<arr.length; i++){

     try{

           var oRequest = new ActiveXObject(arr);   //              XMLHTTP         

           return oRequest;

        }

     catch(oError){

       //    

     }

  }

  throw new Error("MSXML is not installed on your system."); //         MSXML,     

}

var oRequest =createXMLHTTP();  //     XMLHTTP  ,               ,       

 

2.   open  ,           URL,             

 oRequest.open("get","example.txt",false)  //    , 1.     2.URL 3.        ,false =  , true=  

 

3.      ,    ,    onreadystatechange        

  oRequest.send(null);   

  send          ,            ,    get      null,           URL  ,    post        :name1=value1&name2=value2         .

        ,         ,javascript            ,     ,status         HTTP  (200    ,404        ).  ,statusText            ,     responseText          .      xml,   reponseXML             

   XML DOM  .

  :

 var oRequest =createXMLHTTP();

 oRequest.open("get","example.txt",false)   //    

 oRequest.send(null);                //  get  

 alert("Status is "+ oRequest.status +"( "+ oRequest.statusTest +")");  //     ,    

 alert("Response text is :"+ oRequest.responseText);    //          

        xml,    responseXML   .

 oRequest.responseXML.documentElement.tagname;  //         xml        

                      ,  xml http         mime             xml  .

                          ,         ,     onreadystatechange  ,    readyState      4             .   reponse             .           ,       :

 var oRequest =createXMLHTTP();

 oRequest.open("get","example.txt",true)   //    

 oRequest.onreadystatechange = function(){

    if(oRequest.readyState ==4)

     {

        alert("Status is "+ oRequest.status +"( "+ oRequest.statusTest +")");  //     ,    

        alert("Response text is :"+ oRequest.responseText);    //          

     }

 }

 oRequest.send(null);                //  get  

           ,            ,     onreadystatechange  ,   readystate                 .

           abort()       , :

 var oRequest =createXMLHTTP();

 oRequest.open("get","example.txt",true)   //    

 oRequest.onreadystatechange = function(){

    if(oRequest.readyState ==3){

       oRequest.abort();       //            ,             .

    }

    else if(oRequest.readyState ==4)

     {

        alert("Status is "+ oRequest.status +"( "+ oRequest.statusTest +")");  //     ,    

        alert("Response text is :"+ oRequest.responseText);    //          

     }

 }

 oRequest.send(null); 

 

4.     http  

      HTTP          HTTP  ,            ,                      .         HTTP         ,       ,            ,    client server     .

       XMLHTTP    ,                   HTTP    .

getAllResponseHeaders()           HTTP       ,       :

  Date: Sun,14 Nov 2009 20:10:00 GMT

  Server: Apache/1.3 (Unix)

  Vary:Accept

  X-Powered-By:PHP/4.3.8

  Connection:close

  Content-Type: text/html;charset=iso-8859-1;

         ,       ,         ,    php .          ,  :

 var sDate = oRequest.getResponseHeader("Date");  //      

   Http         

 oRequest.setRequestHeader("name","XX");

 oRequest.setRequestHeader("age",18);



 .   Mozilla  XMLHTTP  

      IE XMLHTTP          web       ,                ,  Mozilla           ,    XMLHttpRequest    .  IE      ,            ,   Safari Opera   Mozilla   ,       XMLHttpRequest     XMLHTTP  .

Mozilla   XMLHTTP       :

 var oRequest = new XMLHttpRequest(); 

 

 .      XMLHTTP    

          XMLHttpRequest           .       .

function createXMLHttpRequest(){

if (typeof XMLHttpRequest == "undefined" && window.ActiveXObject) {    //       ,       ,         XMLHttpRequest     XMLHTTP  .

    function XMLHttpRequest() {

        var arrSignatures = ["MSXML2.XMLHTTP.5.0", "MSXML2.XMLHTTP.4.0",

                             "MSXML2.XMLHTTP.3.0", "MSXML2.XMLHTTP",

                             "Microsoft.XMLHTTP"];                        

        for (var i=0; i < arrSignatures.length; i++) {

            try {        

                var oRequest = new ActiveXObject(arrSignatures);           

                return oRequest;      

            } catch (oError) {

                //ignore

            }

        }          

        throw new Error("MSXML is not installed on your system.");               

    }

}

else

    return  new XMLHttpRequest();

}

}

var xmlHttp=createXMLHttpRequest();  //           XMLHTTP    

   XMLHTTP                        ,    .        .