Text does not show up on bars with empty area

[eivindjahren]

If a bar does not have any width or height, text does not show up, even when {textposition: 'outside'} is set.

https://codepen.io/haskellelephant/pen/PyQemG

[alexcjohnson]

Confirmed, thanks for the report @eivindjahren!

[eivindjahren]

The relevant lines are

plotly.js/src/traces/bar/plot.js

Lines 78 to 85 in d5ebb50

	if(!isNumeric(x0) || !isNumeric(x1) ||
	!isNumeric(y0) || !isNumeric(y1) ||
	x0 === x1 || y0 === y1) {
	bar.remove();
	return;
	}

as it removes a bar group if the associated bar is empty so text is never attached to it.

However, changing this behavior to for instance

var text = getText(trace, i);
if(!isNumeric(x0) || !isNumeric(x1) ||
        !isNumeric(y0) || !isNumeric(y1) ||
        ((x0 === x1 || y0 === y1) && !text)) {
    bar.remove();
    return;
}

breaks a lot of tests.

[etpinard]

Perhaps we should do like barpolar does and draw invalid bars with a blank path

plotly.js/src/traces/barpolar/plot.js

Lines 52 to 55 in fdcdd22

	// do not remove blank bars, to keep data-to-node
	// mapping intact during radial drag, that we
	// can skip calling _module.style during interactions
	dPath = 'M0,0Z';

instead of removing them?

[weilu]

Still doesn't show the text for default textposition, which is "auto". Setting {textposition: "outside"} explicitly fixed it for me.

[alb-erandelcastillo]

@etpinard Issue still occurs for bar charts within subplots, where label text doesn't appear for traces with 0 height. The issue can be recreated with this:

chart = make_subplots(rows=2, cols=1)
                
chart.append_trace(
    go.Bar(
        x=['a','b','c','d'],
        y=[2, 4, 0, 4],
        hoverinfo=["y"],
        text=['a text','b text','c text','d text'],
        textposition="outside"
        ),
    row=2, col=1
    )
    
chart.append_trace(
    go.Bar(
        x=['a','b','c','d'],
        y=[0, 0, 0, 1],
        hoverinfo=["y"],
        text=['a text','b text','c text','d text'],
        textposition="outside"
        ),
    row=2, col=1
    )
        
chart.append_trace(
    go.Bar(
        x=['a','b','c','d'],
        y=[0, 5, 3, 1],
        hoverinfo=["y"],
        text=['a 2','b 2', 'c 2', 'd 2'],
        textposition="outside"
        ),
    row=1, col=1
    )
            
chart.update_layout(
        barmode="stack", showlegend=False, xaxis=dict(showticklabels=False))

[xmagor]

Hi, I am puting labels with the total value of the each bar.

with {textposition: "auto"}, I had this result:

When I change that value by "outsite", I get this:

I really apreciate that when I put {textposition: "outside"} zero values are visibles. But my question is : Is there any option to do that the textposition would be always in the bar's top? I was reading the reference: https://plot.ly/python/reference/#bar-textposition and there is only 4 options to this parameter ( "inside" | "outside" | "auto" | "none" ) .

I also tried adding annotations in the plot's layer, and thats works, but with annotations is slower. because of that I am trying to put the labels when I define the data of the chart instead add annotations in the layer.

Thanks for your attention.

[archmoj]

@mangel2095
Thanks for using plotly.
I think you should be able to achieve that by using textposition: 'outside' in every bar trace in your graph.
We appreciate if you use https://community.plot.ly/ for questions like this in future.