From 42924dc2c37e13a0614789a55040b7ba77b5cc8f Mon Sep 17 00:00:00 2001
From: Jan Philipp Timme <jan.philipp@timme.it>
Date: Fri, 22 Dec 2017 12:53:46 +0100
Subject: [PATCH] Add some rough error handling to diagrams.js

---
 js/diagrams.js | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/js/diagrams.js b/js/diagrams.js
index 0076e29..ff5d0b8 100644
--- a/js/diagrams.js
+++ b/js/diagrams.js
@@ -2,8 +2,18 @@
 
 // https://bl.ocks.org/mbostock/3884955
 function createLineGraph(containerId, raceData){
-  console.log(raceData);
+  // Rough input validation
+  if(raceData.raceInfo === undefined) {
+    console.error(["Sorry, that raceData is empty. :-(", raceData]);
+    return; // early return to avoid errors
+  } else {
+    console.log(raceData);
+  }
 
+  var enhancedLapData = processor.getEnhancedLapDataPerDriver(raceData);
+  console.log(enhancedLapData);
+
+  // Configuration
   var height = 720;
   var width = 1080;
   var linePointSize = 5;
@@ -37,9 +47,6 @@ function createLineGraph(containerId, raceData){
   x.domain([0, raceData.lapTimes.size]);
   y.domain([raceData.drivers.length, 1]);
 
-  var enhancedLapData = processor.getEnhancedLapDataPerDriver(raceData);
-  console.log(enhancedLapData);
-
   // Adds all lines
   enhancedLapData.forEach((driverLapData, driverIndex) => {
     //console.log(driverLapData);