Custom ModeBar Button click uses old state values

modeBarButtonsToAdd: [{ name: 'customDownload', title: 'Download', icon: Plotly.Icons.disk, click: (div) => {console.log(div); console.log(chartState); console.log(chartData); } }

chartState is the Plotly state variable passed to the Plot element (data, layout, frames, config)
chartData is the raw data source that is used to generate the data traces for chartState
chartData gets updated during app cycle which updates chartState
All of the data outputs from click event are logged as point of init which has an empty data array, even the chart div that gets passed from the click function

从自定义 ModeBar 按钮配置和接收 chartState 与 chartData 的 React Plot 组件开始。在 chartData 更新后重现点击操作，然后跟踪 callback 和 chart div 暴露的值；当 callback 报告当前状态和数据，而不是初始化时的值时，即表示完成。