Changing data in HighCharts series causes y-axis to blow up - highcharts

Question

I'm seeing some odd behavior in a Highcharts line chart. I have multiple series displayed, and need to let the user change what's called the "Map level" on the chart, which is a straight line across all time periods. Assuming that the correct series is
chart.series[i]
and that the new level that I want it set to is stored in var newMapLevel,
I'm changing that series' data like so:
data = chart.series[i].data;
for(j=0; j<data.length; j++){
data[j].y = newMapLevel;
}
chart.series[i].setData(data);
Calling this function has the desired effect UNLESS the new map level y_value is ONE greater than the highest y_value of all other series, in which case the y-axis scale blows up. In other words, if the y_axis scale is normally from 0 to 275,000, and the highest y_value of any of the other series is, say, 224,000, setting the new map level value to 224,001 causes the y_axis scale to become 0 to 27500M. Yes, that's 27.5 billion.
Might this be a bug in Highcharts? Or is there a better way to change the data in a series?
I've posted a fiddle: http://jsfiddle.net/earachefl/4FuNE/4/

Answer 1

I got my answer from the Highcharts forum:
http://highslide.com/forum/viewtopic.php?f=9&t=13594&p=59888#p59888

Answer 2

This doesn't work as smoothly as I'd like. When you go from 8 as your line to 2 as your line, the scale doesn't adjust back down until you enter another value. Perhaps it's a start in the right direction.
$(document).ready(function(){
$('#clickme').click(function(){
var newMapLevel = $('#newMAP').val();
if(newMapLevel){
for(i=0; i<chart.series.length; i++){
if(chart.series[i].name == 'Map Level'){
data = chart.series[i].data;
for(j=0; j<data.length; j++){
data[j].y = newMapLevel;
}
// get the extremes
var extremes = chart.yAxis[0].getExtremes();
//alert("dataMin: " + extremes.dataMin);
//alert("dataMax: " + extremes.dataMax);
// define a max YAxis value to use when setting the extremes
var myYMax = extremes.dataMax;
if (newMapLevel >= myYMax) {
myYMax = Number(newMapLevel) + 1; // number conversion required
}
if (myYMax > chart.yAxis[0].max) {
alert('cabbbie');
myYMax = chart.yAxis[0].max + 1;
}
//alert("myYMax: " + myYMax);
chart.yAxis[0].setExtremes(extremes.dataMin, myYMax)
// finally, set the line data
chart.series[i].setData(data);
}
}
}
}); });