Supports saving and loading of the selected option in the AutoConnectSelect element. (Issue #64)

src/AutoConnectAux.cpp

@@ -145,7 +145,11 @@ bool AutoConnectAux::release(const String& name) {
 bool AutoConnectAux::setElementValue(const String& name, const String value) {
   AutoConnectElement* elm = getElement(name);
   if (elm) {
-    if (elm->typeOf() != AC_Select) {
+    if (elm->typeOf() == AC_Select) {
+      AutoConnectSelect* elmSelect = reinterpret_cast<AutoConnectSelect*>(elm);
+      elmSelect->select(value);
+    }
+    else {
       if (elm->typeOf() == AC_Checkbox) {
         if (value == "checked") {
           AutoConnectCheckbox* elmCheckbox = reinterpret_cast<AutoConnectCheckbox*>(elm);
@@ -160,8 +164,6 @@ bool AutoConnectAux::setElementValue(const String& name, const String value) {
         elm->value = value;
       return true;
     }
-    else
-      AC_DBG("Element<%s> value type mismatch\n", name.c_str());
   }
   return false;
 }

src/AutoConnectElementBasis.h

@@ -194,7 +194,7 @@ class AutoConnectRadioBasis : virtual public AutoConnectElementBasis {
  */
 class AutoConnectSelectBasis : virtual public AutoConnectElementBasis {
  public:
-  explicit AutoConnectSelectBasis(const char* name = "", std::vector<String> const& options = {}, const char* label = "") : AutoConnectElementBasis(name, ""), label(String(label)), _options(options) {
+  explicit AutoConnectSelectBasis(const char* name = "", std::vector<String> const& options = {}, const char* label = "", const uint8_t selected = 0) : AutoConnectElementBasis(name, ""), label(String(label)), selected(selected), _options(options) {
     _type = AC_Select;
   }
   virtual ~AutoConnectSelectBasis() {}
@@ -203,9 +203,12 @@ class AutoConnectSelectBasis : virtual public AutoConnectElementBasis {
   void  add(const String& option) { _options.push_back(String(option)); }
   size_t  size(void) const { return _options.size(); }
   const String& at(const std::size_t n) const { return _options.at(n); }
+  void  select(const String& value);
   void  empty(const size_t reserve = 0);
+  const String& value(void) const;
 
   String  label;                /**< A label for a subsequent input box */
+  uint8_t selected;             /**< Index of checked value (1-based) */
 
  protected:
   std::vector<String> _options; /**< List options array */

src/AutoConnectElementBasisImpl.h

@@ -198,7 +198,7 @@ const String AutoConnectRadioBasis::toHTML(void) const {
 /**
  * Returns current selected value in the radio same group
  */
-const String& AutoConnectRadioBasis::value() const {
+const String& AutoConnectRadioBasis::value(void) const {
   static const String _nullString = String();
   return checked ? _values.at(checked - 1) : _nullString;
 }
@@ -216,6 +216,19 @@ void AutoConnectSelectBasis::empty(const size_t reserve) {
     _options.reserve(reserve);
 }
 
+/**
+* Indicate an entry with the specified value in the value's collection.
+* @param value     The value to indicates in the collection.
+*/
+void AutoConnectSelectBasis::select(const String& value) {
+  for (std::size_t n = 0; n < _options.size(); n++) {
+    if (at(n).equalsIgnoreCase(value)) {
+      selected = n + 1;
+      break;
+    }
+  }
+}
+
 /**
  * Generate an HTML <select> element with an <option> element.
  * The attribute value of the <option> element is given to the
@@ -230,12 +243,25 @@ const String AutoConnectSelectBasis::toHTML(void) const {
   if (label.length())
     html = String(F("<label for=\"")) + name + String("\">") + label + String(F("</label>"));
   html += String(F("<select name=\"")) + name + String(F("\" id=\"")) + name + String("\">");
-  for (const String option : _options)
-    html += String(F("<option value=\"")) + option + "\">" + option + String(F("</option>"));
+  uint8_t n = 1;
+  for (const String option : _options) {
+    html += String(F("<option value=\"")) + option + "\"";
+    if (n++ == selected)
+      html += String(F(" selected"));
+    html += ">" + option + String(F("</option>"));
+  }
   html += String(F("</select>"));
   return html;
 }
 
+/**
+ * Returns current selected value in the radio same group
+ */
+const String& AutoConnectSelectBasis::value(void) const {
+  static const String _nullString = String();
+  return selected ? _options.at(selected - 1) : _nullString;
+}
+
 /**
  * Generate an HTML <input type=button> element. This element is used
  * for form submission. An 'onclick' attribute calls fixed JavaScript

src/AutoConnectElementJson.h

@@ -24,6 +24,7 @@
 #define AUTOCONNECT_JSON_KEY_OPTION       "option"
 #define AUTOCONNECT_JSON_KEY_PATTERN      "pattern"
 #define AUTOCONNECT_JSON_KEY_PLACEHOLDER  "placeholder"
+#define AUTOCONNECT_JSON_KEY_SELECTED     "selected"
 #define AUTOCONNECT_JSON_KEY_STORE        "store"
 #define AUTOCONNECT_JSON_KEY_STYLE        "style"
 #define AUTOCONNECT_JSON_KEY_TITLE        "title"
@@ -237,10 +238,11 @@ class AutoConnectRadioJson : public AutoConnectElementJson, public AutoConnectRa
  */
 class AutoConnectSelectJson : public AutoConnectElementJson, public AutoConnectSelectBasis {
  public:
-  explicit AutoConnectSelectJson(const char* name = "", std::vector<String> const& options = {}, const char* label = "") {
+  explicit AutoConnectSelectJson(const char* name = "", std::vector<String> const& options = {}, const char* label = "", const uint8_t selected = 0) {
     AutoConnectSelectBasis::name = String(name);
     AutoConnectSelectBasis::_options = options;
     AutoConnectSelectBasis::label = String(label);
+    AutoConnectSelectBasis::selected = selected;
   }
   ~AutoConnectSelectJson() {}
   size_t  getObjectSize(void) const override;

src/AutoConnectElementJsonImpl.h

@@ -320,7 +320,8 @@ void AutoConnectRadioJson::serialize(JsonObject& json) {
     json[F(AUTOCONNECT_JSON_KEY_ARRANGE)] = String(F(AUTOCONNECT_JSON_VALUE_VERTICAL));
     break;
   }
-  json[F(AUTOCONNECT_JSON_KEY_CHECKED)] = checked;
+  if (checked > 0)
+    json[F(AUTOCONNECT_JSON_KEY_CHECKED)] = checked;
 }
 
 /**
@@ -328,7 +329,7 @@ void AutoConnectRadioJson::serialize(JsonObject& json) {
  * @return  An object size for JsonBuffer.
  */
 size_t AutoConnectSelectJson::getObjectSize() const {
-  size_t  size = AutoConnectElementJson::getObjectSize() + JSON_OBJECT_SIZE(3) + _options.size() * JSON_OBJECT_SIZE(1) + JSON_ARRAY_SIZE(1);
+  size_t  size = AutoConnectElementJson::getObjectSize() + JSON_OBJECT_SIZE(4) + _options.size() * JSON_OBJECT_SIZE(1) + JSON_ARRAY_SIZE(1);
   size += sizeof(AUTOCONNECT_JSON_KEY_LABEL) + label.length();
   for (String _option : _options)
     size += _option.length();
@@ -355,6 +356,8 @@ bool AutoConnectSelectJson::loadMember(const JsonObject& json) {
         add(value.as<String>());
       return true;
     }
+    if (json.containsKey(F(AUTOCONNECT_JSON_KEY_SELECTED)))
+      selected = static_cast<uint8_t>(json[F(AUTOCONNECT_JSON_KEY_SELECTED)].as<int>());
   }
   return false;
 }
@@ -370,6 +373,8 @@ void AutoConnectSelectJson::serialize(JsonObject& json) {
   for (String o : _options)
     options.add(o);
   json[F(AUTOCONNECT_JSON_KEY_LABEL)] = label;
+  if (selected > 0)
+    json[F(AUTOCONNECT_JSON_KEY_SELECTED)] = selected;
 }
 
 /**