simple_ajax.js

// Copyright (c) 2014 <Joseph Ellsworth, Bayes Analytic> - See use terms in /docs/license.md
// Add proper error handeling for other
// return status types.

// call the uri with simple get,  collect the results and
// make a callback when done.  If req_headers is defined
// then it will be ieterated with call to xmlhttp.setRequestHeader for
// each value.
function simpleGet(uri, callback, passObj)
{
  var xmlHttp=new XMLHttpRequest();
  function stateChanged()
  {
	  if (xmlHttp.readyState == 4)
	  {
      if ((xmlHttp.status >= 200) && (xmlHttp.status <= 299))
	     callback(xmlHttp.responseText, xmlHttp, passObj);
      else
        callback(null, xmlHttp, passObj)
        //alert('Unhandled AJAX ERROR uri=' + uri + "\nresponseCode=" + xmlHttp.status + " =  " + xmlHttp.statusText);
    }
   }
   xmlHttp.onreadystatechange = stateChanged
   xmlHttp.open("GET", uri, true);
   if (passObj.req_headers) {
     for (headKey in passObj.req_headers) {
       xmlHttp.setRequestHeader(headKey, passObj.req_headers[headKey]);
     }
   }
   xmlHttp.send();
}

// make post sending post string to the requested URI
// if passObj.req_headers exists then will ieterate over
// it as a dictionary of keys as header names and values
// and use the xmlhttp.setRequestHeder to send the header
// If Method is not set then will default to "POST"
function simplePost(uri, postString, callback, passObj, Method) {
  if ((Method == undefined) || (!Method)) {
    Method = "POST";
  }
  var xmlHttp = new XMLHttpRequest();
  function stateChanged() {
    if (xmlHttp.readyState == 4) {
      if ((xmlHttp.status >= 200) && (xmlHttp.status <= 299)) {
        callback(xmlHttp.responseText, xmlHttp, passObj);
      }
      else {
        callback(null, xmlHttp, passObj)
        //alert('Unhandled AJAX ERROR uri=' + uri + "\nresponseCode=" + xmlHttp.status + " =  " + xmlHttp.statusText);
      }
    }
  }
  xmlHttp.onreadystatechange = stateChanged
  xmlHttp.open(Method, uri, true);
  if (passObj.req_headers) {
    for (headKey in passObj.req_headers) {
      xmlHttp.setRequestHeader(headKey, passObj.req_headers[headKey]);
    }
  }
  if ((postString) && (postString.length)) {
    xmlHttp.send(postString);
  }
  else {
    xmlHttp.send();
  }
}



function simpleGetBlock(uri, errCallback)
{
   var tHttp=new XMLHttpRequest();
   tHttp.open("GET",uri,false);
   tHttp.send();
   return {'txt' : tHttp.responseText, 'req' : tHttp.status};
}


/* wraps the basic async call for JSON data with basic error checking
 with the JSON parse
   the method should be in parms.req_method. Currently supports GET and POST
      defaults to GET
   the uri shoudl be in parms.req_uri
   the postbody if present should be in parms.req_post_body
   the outbound headers if present should be in parms.req_headers
 */
function makeJSONCall(parms, callback) {
  function onHTTPData(dataStr, httpObj, parms) {
    if ((dataStr === null) || (dataStr === undefined) || (dataStr.length < 1)) {
      var msg = "ERROR onHTTPUserData Invalid data recieved for " + JSON.stringify(parms);
      if (httpObj) {
        if (httpObj.responseText) {
          msg += "\n responseText=" + httpObj.responseText;
        }
        msg += " httpObj=" + httpObj.toString();
      }
      console.log("errors", msg);
      callback(msg, httpObj, parms, httpObj);
    }
    else {
      try {
        var resObj = JSON.parse(dataStr);
      }
      catch (ex) {
        var msg = "onHTTPData() ERROR parsing " + dataStr + "\nmsg=" + ex.message + "\n" + ex.toString();
        if (httpObj) {
          msg += " httpObj=" + httpObj.toString();
        }
        console.log(msg + " parms=" + JSON.stringify(parms));
        callback(msg, httpObj, parms);
      }
      callback(null, resObj, parms, httpObj);
    }
  }
  var turi = parms.req_uri;
  if (parms.req_method == "GET") {
    simpleGet(turi, onHTTPData, parms);
  }
  else {
    var postBody = parms.req_post_body;
    simplePost(turi, postBody, onHTTPData, parms, parms.req_method);
  }
}

function serverLog(appname) {
   function logdone() {

   }
   var context = {}
   if ((typeof GUser !== 'undefined') && (GUser !== null)){
     context.user = GUser
   }
   if ((typeof GUserGUID !== 'undefined') && (GUserGUID !== null)) {
     context.userGUID = GUserGUID
   }
   if ((typeof GAccessToken !== 'undefined') && (GAccessToken !== null)){
     context.userAccessToken = GAccessToken
   }
   if ((typeof GUserSSOID !== 'undefined') && (GUserSSOID !== null)) {
     context.userSSOID = GUserSSOID
   }
   context.href = location.href;
   var recSep = String.fromCharCode(29) + "\n";
   var b = new String_builder();
   b.b(JSON.stringify(context,null,2));
   b.b(recSep);

   for (var argndx=1; argndx < arguments.length; argndx++) {
      var targ = arguments[argndx];
      if ((targ == undefined) || (targ == null)) {
       // just skip that aurg.
      }
      else if (isString(targ) || isNum(targ)) {
        b.b(targ);
      }
      else {
        b.b(JSON.stringify(targ, null, 2));
      }
      b.b(recSep);
   }
   postStr = b.to_str();

   simplePost("/log/" + appname , postStr, logdone, {}, "POST")
}