UploadControlClientSideEvents.BeforeSend Property

Specifies a client function used to customize a web request before it is sent to the server.

Namespace: DevExpress.Web

Assembly: DevExpress.Web.v25.1.dll

NuGet Package: DevExpress.Web

Declaration

C#

[DefaultValue("")]
public string BeforeSend { get; set; }

VB.NET

<DefaultValue("")>
Public Property BeforeSend As String

Property Value

Type	Default	Description
String	String.Empty	A JavaScript function.

Remarks

Use this property to register a client-side handler for the Upload Control’s beforeSend event.

ASPX

<asp:Content ID="Content1" ContentPlaceHolderID="ContentHolder" runat="Server">

    <script>
        function onBeforeSend(fileUpload, e) {
            /* ... */
        }
    </script>

    <dx:ASPxUploadControl ID="fileUpload"
                        runat="server"
                        ClientSideEvents-BeforeSend="onBeforeSend">
        <!-- ... -->
    </dx:ASPxUploadControl>

</asp:Content>

The function receives the following arguments:

• The client-side Upload Control object instance.
• An object that contains event arguments. Use the object’s request property to access and modify the underlying XMLHttpRequest (for example, add headers).