“Error parsing” in empty axis

まだ誰も着手していません。

I have a probably not common issue, but also probably easy to fix. I have also posted it in the community, and I reproduce it here.

I have a plot (that I create with Python but I edit later on the html/js) that looks like this:
6707dfe749f7dff3cada935f8145053ab34b425a

When I open the html, there are errors on the console:

Error: Problem parsing d="MNaN,NaNHNaNMNaN,NaNHNaN"
Error: Problem parsing d="MNaN,NaNHNaNMNaN,NaNHNaN"

Although the graphs look fine, these errors are annoying (as there are many graphs like this on the page, and therefore many errors).
(I have tested many versions 2.XX and it always happen, including 2.14.0).
Also, what seems to be causing this is related to the black line of xaxis2 and yaxis2 (which is the top-right graph). This is how the layout looks like for this part:

xaxis2: {
  anchor: "y2",
  domain: [0.806, 1.0],
  mirror: true,
  ticks: "",
  linecolor: "black",
  showgrid: false,
  range: [0.0, 1.0],
  fixedrange: true,
  showticklabels: false,
},
yaxis2: {
  anchor: "x2",
  domain: [0.73, 1.0],
  mirror: true,
  ticks: "",
  linecolor: "black",
  showgrid: false,
  range: [0.0, 1.0],
  fixedrange: true,
  showticklabels: false,
},

If I comment out the linecolor: "black", the errors disappear.

I have created a (somewhat) minimal example here: https://codepen.io/filipesmg/pen/ZExmorL
However, the error is not showing directly in codepen (maybe because the error is inside plotly.js?) If that code is put inside <html>(...)</html>, it shows up. The linecolor lines are 640 and 652.

Investigating the plotly.min.js file while running the code, I noticed that the error comes from this part:

(Y.attr = function (e, r) {
if (arguments.length < 2) {
(...)
}
return this.each(K(e, r));
}),

which calls the function K(e,r) that has:

function(){this.setAttribute(e,r)}}

The problem is that in my example, at some point there seems to be no argument to the function (e,r), and r is undefined. There are many times where arguments.length = 1 or 2, but there are 2 times where it is undefined. In these cases, it doesn't enter the if (arguments.length < 2) and it goes to return this.each(K(e, r)); where it gives an error in the .setAttribute(e,r). Maybe a simple if ( ! r) { return; } would solve the issue, but I can't follow more the code to know if it'd affect other things.

I'm using 12.3.1, and I this error shows up in Safari 15.4 and in Chrome 104.0.5112.79, but not on Firefox 103.0.2.

最小限の CodePen 例と生成された HTML から始め、640 行目と 652 行目の xaxis2/yaxis2 の linecolor 設定に注目します。示されている attr/setAttribute コードを通る plotly.min.js のパスを追跡し、undefined 引数の場合を 2 つ比較します。再現したプロットがコンソールのパースエラーなしに描画され、軸の線が維持されれば完了です。

索引モデルが issue の本文から書いたものです。

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“Error parsing” in empty axis

説明

コントリビューションガイド

はじめの一歩

調査の方向性

評価

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