WebDocumentViewerClientSideEventsBuilderBase<TBuilder, TEvents>.OnInitializing(String) Method

Allows you to specify a JavaScript function that runs before Document Viewer fetches the View model from the server and before the BeforeRender event.

Namespace : DevExpress.AspNetCore.Reporting.WebDocumentViewer

Assembly : DevExpress.AspNetCore.Reporting.v25.2.dll

NuGet Package : DevExpress.AspNetCore.Reporting

csharp

public TBuilder OnInitializing(
    string callback
)

Public Function OnInitializing(
    callback As String
) As TBuilder

Parameters

Name	Type	Description
callback	String

The name of a JavaScript function or entire JavaScript function code that runs when the OnInitializing event occurs.

Returns

Type	Description
TBuilder

The WebDocumentViewerClientSideEventsBuilderBase<TBuilder, TEvents> object that can be used for method chaining.

Remarks

The OnInitializing event occurs when the client component is created, before the view model is fetched from the server, and before the BeforeRender event occurs.

You can handle the OnInitializng event` to patch the initial “get designer model” HTTP request:

javascript

onInitializing: function (s) {
    DevExpress.Analytics.Utils.fetchSetup.fetchSettings = { headers: { HEADER1: 'VALUE1' } };
    //DevExpress.Analytics.Utils.ajaxSetup.ajaxSettings = { headers: { HEADER1: 'VALUE1' } };
}