Horizontal stacked bar chart with chart.js
I know this is a few months old, but I thought I'd add my answer for future generations.
I was able to do without extra plugins. If you set the xAxes and yAxes to stacked:true under scales, you can create a stacked horizontal graph.
scales: {
xAxes: [{
stacked: true,
}],
yAxes: [{
stacked: true
}]
}
Here's a quick pen to show how I did it. http://codepen.io/jamiecalder/pen/NrROeB
Bonus: Includes code to show the values on the graph
Take a look at the fork ChartNew.js (https://github.com/FVANCOP/ChartNew.js). This has HorizontalStackedBars (and many other additions). See https://github.com/FVANCOP/ChartNew.js/wiki/050_available_graphs for how its going to look like.