From ec6dc0c4c36062cea198b54e88affdcea9d1823a Mon Sep 17 00:00:00 2001
From: Karai Csaba <cskarai@freemail.hu>
Date: Sat, 7 May 2016 12:41:02 +0200
Subject: [PATCH] Refresh rate implementation

---
 examples/dummy-web-server.pl        |  16 ++++++++++++++++
 examples/web-server/GZipped.html.gz | Bin 70 -> 0 bytes
 examples/web-server/Voltage.html    |  10 ++++++++++
 html/userpage.js                    |  21 +++++++++++++++++++++
 4 files changed, 47 insertions(+)
 delete mode 100644 examples/web-server/GZipped.html.gz
 create mode 100644 examples/web-server/Voltage.html

diff --git a/examples/dummy-web-server.pl b/examples/dummy-web-server.pl
index 6743c43..56015ef 100755
--- a/examples/dummy-web-server.pl
+++ b/examples/dummy-web-server.pl
@@ -423,6 +423,17 @@ sub process_user_comm_led
   return content_response($r, $http->{url});
 }
 
+sub process_user_comm_voltage
+{
+  my ($http) = @_;
+
+  my $voltage = (((time - $startTime) % 60) - 30) / 30.0 + 4.0;
+  $voltage = sprintf("%.2f V", $voltage);
+  
+  my $r = '{"voltage": "' . $voltage . '"}';
+  return content_response($r, $http->{url});
+}
+
 sub process_user_comm()
 {
   my ($http) = @_;
@@ -431,4 +442,9 @@ sub process_user_comm()
   {
     return process_user_comm_led($http);
   }
+
+  if( $http->{url} eq '/Voltage.html.json' )
+  {
+    return process_user_comm_voltage($http);
+  }
 }
diff --git a/examples/web-server/GZipped.html.gz b/examples/web-server/GZipped.html.gz
deleted file mode 100644
index e9c012cb904e9c9107c4e843e72fcd11459dc711..0000000000000000000000000000000000000000
GIT binary patch
literal 0
HcmV?d00001

literal 70
zcmV-M0J;AkiwFohktJ6E14mkEaByX0E@*UZYyeYGut~`*v*S_#0-Fp&yO4~`Vg(>d
cugWYaNKLWP2Z{kDZS=va0Q%qKmo5MR09@P}TmS$7

diff --git a/examples/web-server/Voltage.html b/examples/web-server/Voltage.html
new file mode 100644
index 0000000..08e1017
--- /dev/null
+++ b/examples/web-server/Voltage.html
@@ -0,0 +1,10 @@
+  <meta name="refresh-rate" content="500" />
+  
+  <div class="header">
+    <h1>Voltage measurement</h1>
+  </div>
+
+  <div class="content">
+    <p id="voltage" align="center" style="font-size: 800%"/>
+  </div>
+</body></html>
diff --git a/html/userpage.js b/html/userpage.js
index 9f85a90..3a76530 100644
--- a/html/userpage.js
+++ b/html/userpage.js
@@ -1,6 +1,8 @@
 //===== Java script for user pages
 
 var loadCounter = 0;
+var refreshRate = 0;
+var refreshTimer;
 
 function notifyResponse( data )
 {
@@ -42,6 +44,14 @@ function notifyResponse( data )
       }
     }
   });
+  
+  if( refreshRate != 0 )
+  {
+    clearTimeout(refreshTimer);
+    refreshTimer = setTimeout( function () {
+      ajaxJson("GET", window.location.pathname + ".json?reason=refresh", notifyResponse );
+    }, refreshRate );
+  }
 }
 
 function notifyButtonPressed( btnId )
@@ -101,6 +111,17 @@ document.addEventListener("DOMContentLoaded", function(){
     };
   }
 
+  // collect metas
+  var metas = document.getElementsByTagName("meta");
+
+  for (ndx = 0; ndx < metas.length; ndx++) {
+    var meta = metas[ndx];
+    if( meta.getAttribute("name") == "refresh-rate" )
+    {
+      refreshRate = meta.getAttribute("content");
+    }
+  }
+
   // load variables at first time
   var loadVariables = function() {
     ajaxJson("GET", window.location.pathname + ".json?reason=load", notifyResponse,