michael@0: /**
michael@0:  * Any copyright is dedicated to the Public Domain.
michael@0:  * http://creativecommons.org/publicdomain/zero/1.0/
michael@0:  */
michael@0: var xhr = new XMLHttpRequest();
michael@0: 
michael@0: function onload(event) {
michael@0:   if (event.target != xhr) {
michael@0:     throw "onload event.target != xhr";
michael@0:   }
michael@0: 
michael@0:   if (event.target.status != 200) {
michael@0:     var message = { type: "error",
michael@0:                     error: event.target.status };
michael@0:     postMessage(message);
michael@0:   }
michael@0: 
michael@0:   var message = { type: "load",
michael@0:                   data: xhr.responseText };
michael@0:   postMessage(message);
michael@0: }
michael@0: 
michael@0: xhr.onload = onload;
michael@0: xhr.addEventListener("load", onload, false);
michael@0: xhr.removeEventListener("load", onload, false);
michael@0: if (!xhr.onload) {
michael@0:   var message = { type: "error",
michael@0:                   error: "Lost message listener!" };
michael@0:   postMessage(message);
michael@0: }
michael@0: 
michael@0: xhr.onerror = function(event) {
michael@0:   if (event.target != xhr) {
michael@0:     throw "onerror event.target != xhr";
michael@0:   }
michael@0:   var message = { type: "error",
michael@0:                   error: event.target.status };
michael@0:   postMessage(message);
michael@0: };
michael@0: xhr.onerror = xhr.onerror;
michael@0: if (!xhr.onerror || xhr.onerror != xhr.onerror) {
michael@0:   throw "onerror wasn't set properly";
michael@0: }
michael@0: 
michael@0: function onprogress(event) {
michael@0:   if (event.target != xhr) {
michael@0:     throw "onprogress event.target != xhr";
michael@0:   }
michael@0:   var message = { type: "progress",
michael@0:                   current: event.loaded,
michael@0:                   total: event.total };
michael@0:   postMessage(message);
michael@0: }
michael@0: xhr.addEventListener("progress", onprogress, false);
michael@0: 
michael@0: xhr.addEventListener("foopety", function(event) {}, false);
michael@0: xhr.removeEventListener("doopety", function(event) {}, false);
michael@0: 
michael@0: xhr.onloadend = function(event) {
michael@0:   var message = { type: "loadend" };
michael@0:   postMessage(message);  
michael@0: }
michael@0: 
michael@0: var upload = xhr.upload;
michael@0: upload.onprogress = function(event) { };
michael@0: upload.addEventListener("foo", function(event) { }, false);
michael@0: upload.removeEventListener("foo", function(event) { }, false);
michael@0: upload.addEventListener("load", function(event) { }, false);
michael@0: upload.removeEventListener("foo", function(event) { }, false);
michael@0: upload.onload = function(event) {
michael@0:   var message = { type: "upload.load" };
michael@0:   postMessage(message);
michael@0: }
michael@0: 
michael@0: onmessage = function(event) {
michael@0:   if (xhr.DONE != 4 || XMLHttpRequest.DONE != 4) {
michael@0:     throw "xhr constants not correct!";
michael@0:   }
michael@0:   if (xhr.readystate > xhr.UNSENT) {
michael@0:     throw "XHR already running!";
michael@0:   }
michael@0:   xhr.open("POST", event.data);
michael@0:   xhr.send("Data to send");
michael@0: }