Wizard: Improve ajax

Drop unused test wrapper
Enable first run detection
Spelling fix

apps/routerconsole/jsp/js/welcomeajax.js

@@ -0,0 +1,59 @@
+var fails = 0;
+
+function ajax(url, target, refresh) {
+  // native XMLHttpRequest object
+  if (window.XMLHttpRequest) {
+    req = new XMLHttpRequest();
+    req.onreadystatechange = function() {ajaxDone(url, target, refresh);};
+    req.open("GET", url, true);
+    req.send(null);
+    // IE/Windows ActiveX version
+  } else if (window.ActiveXObject) {
+    req = new ActiveXObject("Microsoft.XMLDOM");
+    if (req) {
+      req.onreadystatechange = function() {ajaxDone(target);};
+      req.open("GET", url, true);
+      req.send(null);
+    }
+  }
+}
+
+function ajaxDone(url, target, refresh) {
+  // only if req is "loaded"
+  if (req.readyState == 4) {
+    var fail = false;
+    var running = true;
+    var done = false;
+    // only if "OK"
+    if (req.status == 200) {
+      // output 1 for complete, 0 + status string for in progress
+      fails = 0;
+      var status;
+      if (req.responseText.startsWith("1")) {
+          results = doneMessage;
+          running = false;
+          done = true;
+          status = "";
+      } else {
+          results = progressMessage;
+          status = req.responseText.substring("1")
+      }
+      document.getElementById("xhr2").innerHTML = status;
+      document.getElementById(target).innerHTML = results;
+    } else if (fails == 0) {
+      // avoid spurious message if cancelled by user action
+      fails++;
+    } else {
+      document.getElementById(target).innerHTML = failMessage;
+      running = false;
+      fail = true;
+    }
+    var form = document.forms[0];
+    form.prev.disabled = fail || !done;
+    form.skip.disabled = !done;
+    form.cancelbw.disabled = !running;
+    form.next.disabled = fail || !done;
+
+    setTimeout(function() {ajax(url, target, refresh);}, refresh);
+  }
+}