Merge pull request #155 from d-a-v/emuAsync

minor adjustments for emulation on host via emuAsync lib (see readme)

README.md

@@ -564,6 +564,17 @@ If you change something in HTML/CSS/JS and want to create a pull request, please
 do include the minified versions and corresponding C header files in your
 commits. (Do **NOT** commit all the minified versions for the non changed files)
 
+# Experimental debugging environment using emulation on host
+
+It is possible to run or debug this library on a unix-like computer (Linux,
+macOS, WSL) without flashing on hardware, and with your favourite debugging
+tools (gdb, valgrind, ...).  This is accomplished through the
+esp8266/Arduino "emulation on host" environment.
+
+A fake AsyncWebserver library is needed because lwIP is not yet ported to
+the emulation environment.  Full instructions can be found in this project's
+[readme page](https://github.com/d-a-v/emuAsync).
+
 ## Changelog for 2.1:
 
  - Adds the ability to have inline styles for widgets and panels

src/ESPUI.cpp

@@ -783,9 +783,9 @@ void ESPUIClass::updateControl(Control* control, int clientId)
     root["id"] = control->id;
     root["visible"] = control->visible;
     root["color"] = (int)control->color;
-    if (control->panelStyle != 0)
+    if (control->panelStyle.length())
         root["panelStyle"] = control->panelStyle;
-    if (control->elementStyle != 0)
+    if (control->elementStyle.length())
         root["elementStyle"] = control->elementStyle;
     serializeJson(document, json);
 
@@ -811,7 +811,7 @@ void ESPUIClass::updateControl(Control* control, int clientId)
     // function like this and it's clients array is private
     int tryId = 0;
 
-    for (size_t count = 0; count < this->ws->count();)
+    for (size_t count = 0; tryId < (int)this->ws->count() && count < this->ws->count();)
     {
         if (this->ws->hasClient(tryId))
         {
@@ -1003,7 +1003,7 @@ void ESPUIClass::addGraphPoint(uint16_t id, int nValue, int clientId)
     // function like this and it's clients array is private
     int tryId = 0;
 
-    for (size_t count = 0; count < this->ws->count();)
+    for (size_t count = 0; tryId < (int)this->ws->count() && count < this->ws->count();)
     {
         if (this->ws->hasClient(tryId))
         {
@@ -1108,9 +1108,9 @@ void ESPUIClass::prepareJSONChunk(AsyncWebSocketClient* client, uint16_t startin
         item["value"] = String(control->value);
         item["color"] = (int)control->color;
         item["visible"] = (int)control->visible;
-        if (control->panelStyle != 0)
+        if (control->panelStyle.length())
             item["panelStyle"] = String(control->panelStyle);
-        if (control->elementStyle != 0)
+        if (control->elementStyle.length())
             item["elementStyle"] = String(control->elementStyle);
         if (control->wide == true)
             item["wide"] = true;