Gets a JsChartViewer object that binds to the given <IMG> tag for chart display.
Note: This is a static method (class method). It should be accessed as JsChartViewer.get, not objName.get.
The id argument specifies the id attribute of the <IMG> tag that the JsChartViewer binds to. If no such JsChartViewer exists, a new JsChartViewer will be created.
The id is also used as the id of the JsChartViewer itself for communications with the server side
WebChartViewer.
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