I created a heatmap in R using plotly (and tried with heatmaply too). Plotly allows for some pretty standard interactivity, like drag-select to zoom. I'd like to be able to "group" parts of the heatmap together, for example, if I have a 10x10 heatmap, columns 1:3 and rows 1:3, such that when a user mouse-overs anywhere within that area, the whole block is selected and displays a tool-tip of summary statistics for that block, or for an entire column, etc. Alternatively, I'd like to be able to click on parts of the dendrogram's tree and zoom in on that.
For the latter, it looks like I can bind to on-click using Plotly, but I'm not exactly sure what function to bind to it. Any thoughts?