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Card: defer element registration until HA app boots (HA 2026.8 registry race) #9

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Merged
vfilby merged 1 commit into from
Aug 22, 2026
Merged

Card: defer element registration until HA app boots (HA 2026.8 registry race) #9

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2 changes: 1 addition & 1 deletion custom_components/shade_engine/manifest.json
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Original file line number Diff line number Diff line change
Expand Up @@ -10,5 +10,5 @@
"issue_tracker": "https://github.com/vfilby/shade-engine/issues",
"requirements": [],
"single_config_entry": true,
"version": "0.5.0"
"version": "0.5.1"
}
21 changes: 19 additions & 2 deletions custom_components/shade_engine/www/shade-engine-card.js
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Original file line number Diff line number Diff line change
Expand Up @@ -15,7 +15,7 @@
* the history strip, graph_hours (default 24) sets its window.
*/

const CARD_VERSION = "0.5.0";
const CARD_VERSION = "0.5.1";

const RAD = Math.PI / 180;
const clamp = (v, lo, hi) => Math.max(lo, Math.min(hi, v));
Expand Down Expand Up @@ -473,7 +473,24 @@ class ShadeEngineCard extends HTMLElement {
}
}

customElements.define("shade-engine-card", ShadeEngineCard);
/* Register the element only once Home Assistant's app has booted.
*
* The integration loads this module via `extra_module_url`, which the index
* page imports concurrently with app.js. Since HA 2026.8 the frontend installs
* the scoped-custom-element-registry polyfill, which REPLACES
* window.customElements with a fresh registry; anything defined on the native
* registry before that swap is invisible to customElements.get() and the
* dashboard shows "Custom element doesn't exist". With a warm cache this
* module reliably wins that race and loses the registry, so wait for HA's root
* element and then define on whatever registry is current. */
function registerCard() {
const registry = window.customElements;
if (registry.get("shade-engine-card")) return;
registry.define("shade-engine-card", ShadeEngineCard);
}
customElements
.whenDefined("home-assistant")
.then(registerCard, registerCard);

window.customCards = window.customCards || [];
window.customCards.push({
Expand Down
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