dosubot[bot] commented on issue #31741: URL: https://github.com/apache/superset/issues/31741#issuecomment-2576063581
<!-- Answer --> The issue you're experiencing with the line chart legend resetting its state when scrolling might be related to how Superset manages the visibility of chart components. Superset uses the `IntersectionObserver` API to determine if a component is in view, which could potentially affect the state of interactive elements like legends when they are scrolled out of view and then back into view <sup>[[1]](https://github.com/apache/superset/blob/master/superset-frontend/src/dashboard/components/gridComponents/Row.jsx)</sup>. Additionally, the event listeners attached to the line chart component, such as `legendselectchanged`, `legendselectall`, and `legendinverseselect`, are responsible for updating the legend state when interactions occur. However, these handlers might not be preserving the state when the chart is scrolled out of view <sup>[[2]](https://github.com/apache/superset/blob/master/superset-frontend/plugins/plugin-chart-echarts/src/Timeseries/EchartsTimeseries.tsx)</sup>. To address this issue, you might need to look into how the state of the legend is being managed and consider implementing a mechanism to persist the state across scroll events. This could involve storing the state in a more persistent way, such as in a global state or using local storage, to ensure it is retained when the chart is scrolled back into view. <!-- Dosu Comment Footer --> *To continue talking to [Dosu](https://dosu.dev), mention @dosu.* --- <sup>Help Dosu learn! Give it feedback: [Great Response](https://app.dosu.dev/response-feedback/fde09ba3-499c-4387-9fb1-5c422fa83558?feedback_type=great_response) | [Irrelevant Answer](https://app.dosu.dev/response-feedback/fde09ba3-499c-4387-9fb1-5c422fa83558?feedback_type=irrelevant_answer) | [Incorrect Sources](https://app.dosu.dev/response-feedback/fde09ba3-499c-4387-9fb1-5c422fa83558?feedback_type=incorrect_sources) | [Too Verbose](https://app.dosu.dev/response-feedback/fde09ba3-499c-4387-9fb1-5c422fa83558?feedback_type=too_verbose) | [Hallucination](https://app.dosu.dev/response-feedback/fde09ba3-499c-4387-9fb1-5c422fa83558?feedback_type=hallucination) | [Other](https://app.dosu.dev/response-feedback/fde09ba3-499c-4387-9fb1-5c422fa83558?feedback_type=other)</sup> -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
