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Add dummy 'wheel' event handler to enable scroll zoom on safari #7474

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Merged
merged 8 commits into from
Jul 18, 2025
Merged

Add dummy 'wheel' event handler to enable scroll zoom on safari #7474

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06c3e7f
add dummy 'wheel' event handler to enable scroll zoom on safari
emilykl Jul 17, 2025
e6618c6
move dummy scroll listener to Events.init()
emilykl Jul 17, 2025
3ebf3bd
use conditional chaining instead of if statement
emilykl Jul 18, 2025
b142a3d
use newer acorn version for bundling, to support newer JS syntax
emilykl Jul 18, 2025
4a54374
add draftlog
emilykl Jul 18, 2025
b5deb4d
Update draftlogs/7474_fix.md
emilykl Jul 18, 2025
76c855d
return to if statement for checking existence of addEventListener
emilykl Jul 18, 2025
72c2269
Revert "use newer acorn version for bundling, to support newer JS syn…
emilykl Jul 18, 2025
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move dummy scroll listener to Events.init()
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@emilykl
emilykl committed Jul 17, 2025
commit e6618c678a90fa0fcda1bb959b6fe2d98d53a6e8
10 changes: 10 additions & 0 deletions src/lib/events.js
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Original file line number Diff line number Diff line change
Expand Up @@ -59,6 +59,16 @@ var Events = {
internalEv.emit(event, data);
};

/*
* Add a dummy event handler for 'wheel' event for Safari
* to enable mouse wheel zoom.
* https://github.com/d3/d3/issues/3035
* https://github.com/plotly/plotly.js/issues/7452
*/
if(typeof plotObj.addEventListener === 'function') {
plotObj.addEventListener("wheel", () => {});
}
Comment on lines +68 to +70
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Why is the if block necessary? Can plotObj be undefined?

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@camdecoster There's several tests which pass an empty object ({}) as plotObj, which was leading to an error causing the test to fail.

I'm not sure if plotObj is supposed to be a DOM object or if other types are allowed.

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@emilykl emilykl Jul 18, 2025 •
edited
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Looks like in the actual code (tests aside), Events.init() is only called in one place, and the argument is the output of getGraphDiv(), which cannot be null or undefined but it could theoretically be some other type besides a DOM element.

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I wonder if we should modify the tests rather than adding this if statement.

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Maybe just use the optional chaining operator? I think that would essentially do the same thing as the if block, but is more compact and you wouldn't have to update any tests.
plotObj?.addEventListener("wheel", () => {});

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Nice, TIL.

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@camdecoster I've reverted to the if statement due to the conditional chaining operator not being supported in our build pipeline (see #7477) -- are you OK with me merging as it is currently?

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Yes, this code will work fine.


return plotObj;
},

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6 changes: 0 additions & 6 deletions src/plot_api/plot_api.js
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Expand Up @@ -64,12 +64,6 @@ function _doPlot(gd, data, layout, config) {
// Events.init is idempotent and bails early if gd has already been init'd
Events.init(gd);

// Add dummy event handler for 'wheel' event for Safari
// to enable mouse wheel zoom
// https://github.com/d3/d3/issues/3035
// https://github.com/plotly/plotly.js/issues/7452
d3.select(gd).on('wheel', function() {});

if(Lib.isPlainObject(data)) {
var obj = data;
data = obj.data;
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