Ajax Class error with accessing class variable in onreadystatechange function

Question

I am currently writing a JavaScript Ajax class and have encountered an error. In the function processRawData() I can\'t seem to access the class variable xhr by using this.xhr.

Answer 1

Looks like your problem might be because in processRawData() you are returning another function and referencing this.xhr.readyState, but 'this' now references the returning function and not the Ajax class. Try:

Ajax.prototype.processRawData = function(dataType, callback){

var that = this; //'that' references the current Ajax instance

 return function()
 {
    if (that.xhr.readyState === 4 && that.xhr.status === 200) {...