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

從自訂 ModeBar 按鈕設定和接收 chartState 與 chartData 的 React Plot 元件開始。在 chartData 更新後重現點擊操作，然後追蹤 callback 和 chart div 暴露的值；當 callback 回報目前的狀態和資料，而不是初始化時的值時，即表示完成。