Fix slider for devices without RGB

Fix slider for devices with one or two channels like only white or white/yellow
arendst · Nov 30, 2019 · 5524075 · 5524075
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commit 5524075
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diff --git a/tasmota/CHANGELOG.md b/tasmota/CHANGELOG.md
@@ -2,6 +2,8 @@
 
 ### 7.1.0.1 20191130
 
+- Fix slider for devices with one or two channels like only white or white/yellow
+
 ## Released
 
 ### 7.1.0 20191129

diff --git a/tasmota/xdrv_01_webserver.ino b/tasmota/xdrv_01_webserver.ino
@@ -154,9 +154,11 @@ const char HTTP_SCRIPT_ROOT[] PROGMEM =
 
 const char HTTP_SCRIPT_ROOT_PART2[] PROGMEM =
   "function lc(v,i,p){"
-    "if(v=='h'||v=='d'){"                 // Hue or Brightness changed so change Saturation colors too
-      "var sl=eb('sl4').value;"
-      "eb('s').style.background='linear-gradient(to right,rgb('+sl+'%%,'+sl+'%%,'+sl+'%%),hsl('+eb('sl2').value+',100%%,50%%))';"
+    "if(eb('s')){"                        // Check if Saturation is in DOM otherwise javascript fails on la()
+      "if(v=='h'||v=='d'){"               // Hue or Brightness changed so change Saturation colors too
+        "var sl=eb('sl4').value;"
+        "eb('s').style.background='linear-gradient(to right,rgb('+sl+'%%,'+sl+'%%,'+sl+'%%),hsl('+eb('sl2').value+',100%%,50%%))';"
+      "}"
     "}"
     "la('&'+v+i+'='+p);"
   "}"