Morris Plot with Dynamically Sorted Legend

This demo shows how to customize the legend in a morrisjs plot, created using rCharts. If you hover over the line, you will observe that the order of the variables traj1 and traj2 in the legend switches based on which value is greater. This demo was created in response to a question posed on github.

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<pre><code class='r'>month = 0:10
dat &lt;- data.frame(
  month = month,
  traj1 = rnorm(11),
  traj2 = rnorm(11)
)
m1 &lt;- mPlot(x = 'month', y = c('traj1', 'traj2'), data = dat, type = 'Line')
m1$set(parseTime = FALSE)
m1$set(hoverCallback = &quot;#! function(index, options, content){
   var row = options.data[index]
   month = 'Month: ' + row.month
   line1 = 'Traj1: ' + row.traj1
   line2 = 'Traj2: ' + row.traj2
   if (row.traj1 &lt; row.traj2){
     tmp = line1; line1 = line2; line2 = tmp; 
   }
   return [month, line1, line2].join('&lt;br/&gt;')
} !#&quot;)
m1

</code></pre>
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    <script type='text/javascript'>
    var chartParams = {
 "element": "chart15961f0c408",
"width":            700,
"height":            400,
"xkey": "month",
"ykeys": [
 "traj1",
"traj2" 
],
"data": [
 {
 "month": 0,
"traj1": -1.043545070837,
"traj2": -0.3738552629869 
},
{
 "month": 1,
"traj1": 1.178902021019,
"traj2": -0.02622395872875 
},
{
 "month": 2,
"traj1": 1.418269738111,
"traj2": 1.789230918333 
},
{
 "month": 3,
"traj1": -1.718234157295,
"traj2": -2.046378574553 
},
{
 "month": 4,
"traj1": 1.471426259781,
"traj2": 2.246902862323 
},
{
 "month": 5,
"traj1": 1.196944295267,
"traj2": 1.845120537351 
},
{
 "month": 6,
"traj1": -1.504747109399,
"traj2": -0.7289058610983 
},
{
 "month": 7,
"traj1": -1.432637917079,
"traj2": -0.7096412934887 
},
{
 "month": 8,
"traj1": 1.392273894799,
"traj2": -1.300984562468 
},
{
 "month": 9,
"traj1": -0.4115259684652,
"traj2": -2.095647356595 
},
{
 "month": 10,
"traj1": -0.04985627691913,
"traj2": 0.5969627708814 
} 
],
"parseTime": false,
"hoverCallback":  function(index, options, content){
   var row = options.data[index]
   month = 'Month: ' + row.month
   line1 = 'Traj1: ' + row.traj1
   line2 = 'Traj2: ' + row.traj2
   if (row.traj1 < row.traj2){
     tmp = line1; line1 = line2; line2 = tmp; 
   }
   return [month, line1, line2].join('<br/>')
} ,
"id": "chart15961f0c408",
"labels": [ "traj1", "traj2" ] 
},
      chartType = "Line"
    new Morris[chartType](chartParams)
</script>
    
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