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Update getCurrentOutputInfo() on element resize or visibility change #3682

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@cpsievert cpsievert commented Aug 9, 2022

Currently shiny.js only sends input values tied to output values (e.g., .clientdata_output_{id}_width, etc) to the server (i.e., getCurrentOutputInfo()) when the window resizes (or if certain Bootstrap events happens). This PR leverages ResizeObserver() and IntersectionObserver() to update those relevant input values whenever the element is resized or has its visibility changed (regardless of what has caused that change)

TODO

  • Investigate more why fbe9d24 is needed (it's needed because, if the output container is stretchy, the image won't know to shrink when the container shrinks since it's size is determined by the parent)

@cpsievert cpsievert changed the title Send relevant getCurrentOutputInfo() input values on element resize, mutation, or intersection Update getCurrentOutputInfo() on element resize or visibility change Aug 9, 2022
@cpsievert cpsievert requested a review from jcheng5 August 9, 2022 17:30
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dvg-p4 commented Sep 14, 2022

(it's needed because, if the output container is stretchy, the image won't know to shrink when the container shrinks since it's size is determined by the parent)

@cpsievert what does a "stretchy output container" look like? e.g. what's an example app that doesn't resize the image properly without that fbe9d24 code? (Want to make sure my PR #3683 isn't overlooking an edge case, and that it's compatible with this fix.)

function doSendOutputHiddenState() {
const visibleOutputs = {};
io.observe(el);
$(el).data("shiny-intersection-observer", io);
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Double-check on the UX with scrolling here

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