basic work done for editing output

i had to use a global variable to put the outputId to edit in I receive
from the GET param edit. I havent found another solution. I wish I could
just pass the GET param to the template processor, but it seems this is
not possible at the moment or I havent seen the correct solution yet.

Arduino/CanGrow/include/Webserver/Page_system.h

@@ -30,6 +30,23 @@
 
 #include "Page_system_HTML.h"
 
+/* global runtime variables */
+
+/* VERY VERY DIRTY WORKAROUND
+ * I have the problem, that I cannot pass a parameter I receive from a http
+ * request to it's template processor. In my case i want to edit an output,
+ * the user should click an edit button on the system/output overview page.
+ * I am lazy so i want to reuse the output_add page, because it is quite 
+ * kinda exactly the same. so i want to call GET /system/output/add?edit=ID
+ * I have searched and came to the conclusion, that at this point i see no
+ * other way then giving the parameter I need, the outputId, to an global 
+ * variable, so the template processor can read it. 
+ */ 
+byte tmpParam_editOutputId = 255;
+
+
+
+
 /* subnav processor */
 
 bool Test_WebPage_system_SUBNAV(const String& var) {
@@ -391,7 +408,12 @@ void WebPage_system_output(AsyncWebServerRequest *request) {
     
         
   } else {
-    request->send_P(200, "text/html", Page_system_output_HTML, Proc_WebPage_system_output);
+    if(request->hasParam("success")) {
+      // when GET param success is present, we use the _POST processor for the save message
+      request->send_P(200, "text/html", Page_system_output_HTML, Proc_WebPage_system_output_POST);
+    } else {
+      request->send_P(200, "text/html", Page_system_output_HTML, Proc_WebPage_system_output);
+    }
   }
   
 }
@@ -401,7 +423,7 @@ void WebPage_system_output(AsyncWebServerRequest *request) {
  */
  
 /* returns select <option> list of available output types */
-String Html_SelOpt_type_WebPage_system_output_add(byte selectId = 0) {
+String Html_SelOpt_type_WebPage_system_output_add(byte selectId = 255) {
   String outputType_html;
   // go through all available Output Devices, skip 0 because it means unconfigured
   for(byte i = 1; i < Output_Type_total; i++) {
@@ -418,7 +440,7 @@ String Html_SelOpt_type_WebPage_system_output_add(byte selectId = 0) {
   return outputType_html;
 }
 
-String Html_SelOpt_device_WebPage_system_output_add(byte selectId = 0) {
+String Html_SelOpt_device_WebPage_system_output_add(byte selectId = 255) {
   String outputDevice_html;
   // go through all available Output Devices, skip 0 because it means unconfigured
   for(byte i = 1; i < Output_Device_total; i++) {
@@ -435,7 +457,8 @@ String Html_SelOpt_device_WebPage_system_output_add(byte selectId = 0) {
   return outputDevice_html;
 }
 
-String Proc_WebPage_system_output_add(const String& var) {
+
+String Proc_WebPage_system_output_addCommon(const String& var) {
   #ifndef DEBUG
   Serial.print("DB [Webserver:system:output:add(Proc)] var:   ");
   Serial.println(var);
@@ -465,6 +488,74 @@ String Proc_WebPage_system_output_add(const String& var) {
   }
 }
 
+
+String Proc_WebPage_system_output_add(const String& var) {
+  #ifndef DEBUG
+  Serial.print("DB [Webserver:system:output:add(Proc)] var:   ");
+  Serial.println(var);
+  #endif
+  if(TestHeaderFooter(var)) {
+    return AddHeaderFooter(var, 2);
+  } else if(Test_WebPage_system_SUBNAV(var)) {
+    return Proc_WebPage_system_SUBNAV(var, 1);
+  } else if(var == "ACTION") {
+    return String("Add");
+    
+  } else if(var == "OUTPUT_ID") {
+    // we check which id is free. A free ID as type == 0
+    return String(Give_Free_OutputId());
+    
+    /* OUTPUT_TYPE */
+  } else if(var == "OUTPUT_TYPE") {
+    return Html_SelOpt_type_WebPage_system_output_add();
+    
+    /* OUTPUT_DEVICE */
+  } else if(var == "OUTPUT_DEVICE") {
+    return Html_SelOpt_device_WebPage_system_output_add();
+    
+    /* GPIO_INDEX */
+  } else if(var == "GPIO_INDEX") {
+    return Html_SelectOpt_GPIOindex();
+    
+  } else {
+    return String();
+  }
+}
+
+String Proc_WebPage_system_output_addEdit(const String& var) {
+  #ifndef DEBUG
+  Serial.print("DB [Webserver:system:output:addEdit(Proc)] var:   ");
+  Serial.println(var);
+  #endif
+  if(TestHeaderFooter(var)) {
+    return AddHeaderFooter(var, 2);
+  } else if(Test_WebPage_system_SUBNAV(var)) {
+    return Proc_WebPage_system_SUBNAV(var, 1);
+  } else if(var == "ACTION") {
+    return String("Edit");
+    
+  } else if(var == "OUTPUT_ID") {
+    // return the outputId we got from GET .../add?edit=ID
+    // dirty workaround to put this in a global variable
+    return String(tmpParam_editOutputId);
+    
+    /* OUTPUT_TYPE */
+  } else if(var == "OUTPUT_TYPE") {
+    return Html_SelOpt_type_WebPage_system_output_add(config.system.output.type[tmpParam_editOutputId]);
+    
+    /* OUTPUT_DEVICE */
+  } else if(var == "OUTPUT_DEVICE") {
+    return Html_SelOpt_device_WebPage_system_output_add(config.system.output.device[tmpParam_editOutputId]);
+    
+    /* GPIO_INDEX */
+  } else if(var == "GPIO_INDEX") {
+    return Html_SelectOpt_GPIOindex(config.system.output.gpio[tmpParam_editOutputId]);
+    
+  } else {
+    return String();
+  }
+}
+
 String Proc_WebPage_system_output_add_POST(const String& var) {
   if(var == "SAVE_MSG") {
     return String(Common_HTML_SAVE_MSG);
@@ -571,8 +662,24 @@ void WebPage_system_output_add(AsyncWebServerRequest *request) {
     
     SaveConfig();
     
-    request->send_P(200, "text/html", Page_system_output_add_HTML, Proc_WebPage_system_output_add_POST);
+    // request->send_P(200, "text/html", Page_system_output_add_HTML, Proc_WebPage_system_output_add_POST);
+    // I like it more when user gets redirected to the output overview after saving
+    request->redirect("/system/output/?success");
   } else {
-    request->send_P(200, "text/html", Page_system_output_add_HTML, Proc_WebPage_system_output_add);
+    
+    if(request->hasParam("edit")) {
+        
+        
+        const AsyncWebParameter* p_edit = request->getParam("edit");
+        Serial.println("DB [Webserver:system:output:add?edit] ");
+        //Serial.printf(":: [Webserver:system] POST[%s]: %s\n", p_edit->name().c_str(), p_edit->value().c_str());
+        
+        tmpParam_editOutputId = p_edit->value().toInt();
+        
+        request->send_P(200, "text/html", Page_system_output_add_HTML, Proc_WebPage_system_output_addEdit);
+        
+      } else {
+        request->send_P(200, "text/html", Page_system_output_add_HTML, Proc_WebPage_system_output_add);
+      }
   }
 }

Arduino/CanGrow/include/Webserver/Page_system_HTML.h

@@ -30,8 +30,8 @@
 
 
 const char* Page_system_HTML PROGMEM = R"(%HEADER%
-%SAVE_MSG%
 %SUBNAV%
+%SAVE_MSG%
 <p>here you can set which features and sensors you use<br></p><form method='post' action='/system/'>
 
 <u>NTP offset</u>:<br>
@@ -157,10 +157,10 @@ const char* Page_system_output_HTML PROGMEM = R"(%HEADER%
  */
 const char* Page_system_output_add_HTML PROGMEM = R"(%HEADER%
 %SUBNAV%
-<h3>&#10133; Add output ID %OUTPUT_ID%</h3>
+<h3>&#10133; %ACTION% output ID %OUTPUT_ID%</h3>
 %SAVE_MSG%
 
-<p>Add a new output to CanGrow.</p>
+<p>%ACTION% CanGrow output.</p>
 <form method='post' action='/system/output/add'>
 <input type='hidden' name='outputId' value='%OUTPUT_ID%' />
 <u>Type</u>:<br>