DxDocumentViewerCallbacks.BeforeRender Property

Specifies the handler for the BeforeRender client-side event that allows you to perform any action before the Web Document Viewer is rendered.

Namespace: DevExpress.Blazor.Reporting

Assembly: DevExpress.Blazor.Reporting.v23.2.JSBasedControls.Common.dll

NuGet Package: DevExpress.Blazor.Reporting.JSBasedControls.Common

Declaration

C#

[Parameter]
public string BeforeRender { get; set; }

VB.NET

<Parameter>
Public Property BeforeRender As String

Property Value

Type	Description
String	The name of a JavaScript function used to handle the BeforeRender event.

Remarks

The BeforeRender event allows you to perform any action before the Web Document Viewer is rendered.

You can also use this event to customize the Web Document Viewer’s View Model before it is bound to an HTML element and/or Knockout binding is activated.

The handler function receives two parameters: the first parameter is the client-side Document Viewer (the event sender) and the second parameter is the current View Model.

The following code handles the BeforeRender event to specify the Document Viewer’s zoom level:

reporting_ViewerCustomization.js

window.ReportingViewerCustomization = {
    //Change default Zoom level
    onBeforeRender: function(s, e) {
        //-1: Page Width
        //0: Whole Page
        //1: 100%
        e.reportPreview.zoom =-1;
    }
}

_Host.cshtml

<script src="~/js/reporting_ViewerCustomization.js"></script>

Viewer.razor

<DxDocumentViewer ReportName="SampleReport" Height="1000px" Width="100%">
    <DxDocumentViewerCallbacks BeforeRender="ReportingViewerCustomization.onBeforeRender" />
</DxDocumentViewer>