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It is required to specify the render format in Js Viewer in the following scenarios:
The Js Viewer supports three render formats - 'auto' (default), 'html', and 'svg'. For a Page or an RDLX report, set the value to 'html'. For a Section report, set the value to 'svg'
To switch the mode, you should specify the renderFormat setting through the JS Viewer API:
viewer = GrapeCity.ActiveReports.JSViewer.create({
element: '#viewer-host',
renderFormat: 'svg'
});