bugfix: make ajax module work

src/ajax.nim

@@ -12,24 +12,30 @@ proc ajax(meth, url: cstring; headers: openarray[(cstring, cstring)];
     cont(httpStatus, response)
     redraw()
 
-  proc setRequestHeader(a, b: cstring) {.importc: "ajax.setRequestHeader".}
-  {.emit: """
-  var ajax = new XMLHttpRequest();
-  ajax.open(`meth`,`url`,true);""".}
+  type
+    HttpRequest {.importc.} = ref object
+    ThisObj {.importc.} = ref object
+      readyState, status: int
+      responseText, statusText: cstring
+
+  proc setRequestHeader(r: HttpRequest; a, b: cstring) {.importcpp: "#.setRequestHeader(@)".}
+  proc statechange(r: HttpRequest; cb: proc()) {.importcpp: "#.onreadystatechange = #".}
+  proc send(r: HttpRequest; data: cstring) {.importcpp: "#.send(#)".}
+  proc open(r: HttpRequest; meth, url: cstring; async: bool) {.importcpp: "#.open(@)".}
+  proc newRequest(): HttpRequest {.importcpp: "new XMLHttpRequest(@)",}
+
+  var this {.importc: "this".}: ThisObj
+  let ajax = newRequest()
+  ajax.open(meth, url, true)
   for a, b in items(headers):
-    setRequestHeader(a, b)
-  {.emit: """
-  ajax.onreadystatechange = function(){
-    if(this.readyState == 4){
-      if(this.status == 200){
-        `contWrapper`(this.status, this.responseText);
-      } else {
-        `contWrapper`(this.status, this.statusText);
-      }
-    }
-  }
-  ajax.send(`data`);
-  """.}
+    ajax.setRequestHeader(a, b)
+  ajax.statechange proc() =
+    if this.readyState == 4:
+      if this.status == 200:
+        contWrapper(this.status, this.responseText)
+      else:
+        contWrapper(this.status, this.statusText)
+  ajax.send(data)
 
 proc ajaxPut*(url: cstring; headers: openarray[(cstring, cstring)];
           data: cstring;

src/karax.nim

@@ -223,6 +223,7 @@ when false:
   var drawTimeout: Timeout
 
 proc dodraw() =
+  if dorender.isNil: return
   let newtree = dorender()
   newtree.id = "ROOT"
   toFocus = nil