xhr request wrapper.

xer.js

/* Author: Zack Bonebrake

*/

var Requester = function(options) {
    this.url = options.url;
    this.data = options.data;
    this.method =  options.reqMethod;
    this.cors = options.cors || false;
    this.expects = options.expects || 'application/json'
    this.headers = options.httpHeaders; 
}

Requester.prototype.send = function(data, callback) {
    var self = this;
    if (XMLHttpRequest) {
        var request = new XMLHttpRequest();
        if (this.cors && request.withCredentials != undefined) {
            request.onreadystatechange = handler;
            console.log(self.method);
            request.open(self.method, self.url, true);
            request.setRequestHeader('Content-Type', self.expects);
            var keys = Object.keys(self.headers);

            for (var i in keys) {
                request.setRequestHeader(keys[i], self.headers[keys[i]]);
            }

            if (self.data) {
                request.send(JSON.stringify(self.data));    
            } else {
                request.send();
            }
        }
    }

    function handler() {
        if (this.readyState == 4) {
            if (this.status >= 300) {
                //TODO: make this meaningful
                err = new Error('something went wrong: ' + this.status);
                callback(err)
            } else {
                callback(null, this.responseText);    
            }
            
        }
        // console.log(this.readyState);
        // console.log(this.responseText);
    }
}