Webui small fixes (#3713)

esphome/components/climate/climate_traits.cpp

@@ -1,19 +1,10 @@
 #include "climate_traits.h"
-#include <cstdio>
 
 namespace esphome {
 namespace climate {
 
 int8_t ClimateTraits::get_temperature_accuracy_decimals() const {
-  // use printf %g to find number of digits based on temperature step
+  return step_to_accuracy_decimals(this->visual_temperature_step_);
-  char buf[32];
-  sprintf(buf, "%.5g", this->visual_temperature_step_);
-  std::string str{buf};
-  size_t dot_pos = str.find('.');
-  if (dot_pos == std::string::npos)
-    return 0;
-
-  return str.length() - dot_pos - 1;
 }
 
 }  // namespace climate

esphome/components/web_server/web_server.cpp

@@ -360,9 +360,14 @@ void WebServer::handle_sensor_request(AsyncWebServerRequest *request, const UrlM
 }
 std::string WebServer::sensor_json(sensor::Sensor *obj, float value, JsonDetail start_config) {
   return json::build_json([obj, value, start_config](JsonObject root) {
-    std::string state = value_accuracy_to_string(value, obj->get_accuracy_decimals());
+    std::string state;
+    if (isnan(value)) {
+      state = "NA";
+    } else {
+      state = value_accuracy_to_string(value, obj->get_accuracy_decimals());
       if (!obj->get_unit_of_measurement().empty())
         state += " " + obj->get_unit_of_measurement();
+    }
     set_json_icon_state_value(root, obj, "sensor-" + obj->get_object_id(), state, value, start_config);
   });
 }
@@ -719,12 +724,15 @@ std::string WebServer::number_json(number::Number *obj, float value, JsonDetail
       root["step"] = obj->traits.get_step();
       root["mode"] = (int) obj->traits.get_mode();
     }
-    std::string state = str_sprintf("%f", value);
-    root["state"] = state;
     if (isnan(value)) {
       root["value"] = "\"NaN\"";
+      root["state"] = "NA";
     } else {
       root["value"] = value;
+      std::string state = value_accuracy_to_string(value, step_to_accuracy_decimals(obj->traits.get_step()));
+      if (!obj->traits.get_unit_of_measurement().empty())
+        state += " " + obj->traits.get_unit_of_measurement();
+      root["state"] = state;
     }
   });
 }

esphome/core/helpers.cpp

@@ -258,6 +258,19 @@ std::string value_accuracy_to_string(float value, int8_t accuracy_decimals) {
   return std::string(tmp);
 }
 
+int8_t step_to_accuracy_decimals(float step) {
+  // use printf %g to find number of digits based on temperature step
+  char buf[32];
+  sprintf(buf, "%.5g", step);
+
+  std::string str{buf};
+  size_t dot_pos = str.find('.');
+  if (dot_pos == std::string::npos)
+    return 0;
+
+  return str.length() - dot_pos - 1;
+}
+
 // Colors
 
 float gamma_correct(float value, float gamma) {

esphome/core/helpers.h

@@ -415,6 +415,9 @@ ParseOnOffState parse_on_off(const char *str, const char *on = nullptr, const ch
 /// Create a string from a value and an accuracy in decimals.
 std::string value_accuracy_to_string(float value, int8_t accuracy_decimals);
 
+/// Derive accuracy in decimals from an increment step.
+int8_t step_to_accuracy_decimals(float step);
+
 ///@}
 
 /// @name Colors