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v0.5.1: card works on dashboards opened during startup - #8
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Dashboards opened while Home Assistant was still starting never loaded the card and showed "Configuration error" until the page was reloaded, because the integration's own card URL only exists once it is set up. The card is now also copied to /config/www/battery_roi and added as a dashboard resource; /local is served from the start. Removing the integration removes both again. Version 0.5.1.
PeterSlijkhuis
marked this pull request as ready for review
September 29, 2026 09:01
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Before: A dashboard opened while Home Assistant was still starting (after a restart or update, often in the phone app) showed "Configuration error" instead of the card. It stayed that way until the page was fully reloaded, even though the sensors were fine.
After: The card loads on those dashboards too. Reproduced in a test Home Assistant by opening the dashboard during startup: before the change the error stayed for 45 s and more; after it the card showed right away.
Cause: the card was only served from the integration's own URL, which exists once the integration is set up. Home Assistant serves dashboards well before that, and a page never picks up a card that is added after it has loaded.
How: on setup the card files are copied to
/config/www/battery_roiand added as a dashboard resource (/local/battery_roi/battery-roi-card.js?v=<version>)./localis served from the moment Home Assistant starts. The old URL stays as a fallback, and the card ignores being loaded twice. The resource URL follows the version, so updates bust the cache. Removing the integration removes the copy and the resource. YAML-managed resources are left alone (README explains the one line to add). If the resource step fails for any reason, setup continues and logs a warning. Version 0.5.1.Release note for v0.5.1:
Tests: 27 pass, including a new one that checks the copy, the resource and the cleanup on removal.
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