Sends a partial update request (AJAX request) to the server.
This method will send the state of the JsChartViewer to the server using AJAX techniques. The web page will not be refreshed. It is expected the server will use a WebChartViewer
to process the request, and return the updated state, the updated chart and/or the updated image map.
During the partial update, a "rotating clock" icon (configurable using JsChartViewer.updatingMsg
) will appear on the chart to indicate that a partial update is in progress.
This method is asynchronous. It will return before the update has been completed.
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