texttemplate for heatmaps & histogram2d traces

[colinfang]

For a heatmap, it is not very easy to do annotations that simply show text for each grid. (One has to specify x, xref, y, yref, ....

Can we borrow the idea from scatter, by introducing a mode parameter that allows to display text as well as marker/line?

[etpinard]

Interesting.

Can we borrow the idea from scatter, by introducing a mode parameter that allows to display text as well as marker/line?

Why not use a scatter trace on top of the heatmap trace?

[colinfang]

Then I have to make nrows scatter traces, which seems worse than the existing annotations.

If we are allowed to use mode = 'text', to print z values for heatmap can be as simple as

Heatmap(z=z, text=z, mode='text') 

[mafar]

i translated create_annotated_heatmap python plotly.py to js here as standalone.
#4116
i hope it gets integrated.

[Carl-Analytix]

This should be done in my opinion. I dont like using figurefactory for subplotting heatmaps. It is a pain extracting all the data out and making sure you have everything to be placed in the new subplot correctly. The same goes for annotations when doing a go.Heatmap. This utility would be great, especially if you could adjust the size, family, and color of the text. Maybe an annotation kwarg would be ideal for Heatmap types. And something to control word wrapping?

[ghost]

Was this ever added? It's such a pain to manually create the values for annotating when they're already there in the tooltip to use.

[nicolaskruchten]

We definitely want to do this, and it would be great to get an outside contributor to help :)

[archmoj]

Instead of a text mode, it looks like texttemplate could/should be added.

[nicolaskruchten]

Yeah let's not add a mode, let's add a showtext attribute or something and texttemplate