ASPxCallback.GetRenderResult(Control) Method

Returns the HTML representation of a specific control.

Namespace: DevExpress.Web

Assembly: DevExpress.Web.v21.2.dll

NuGet Package: DevExpress.Web

Declaration

C#

public static string GetRenderResult(
    Control control
)

VB.NET

Public Shared Function GetRenderResult(
    control As Control
) As String

Parameters

Name	Type	Description
control	Control	A Control object that specifies the control whose HTML code should be returned.

Returns

Type	Description
String	A string that contains the HTML code representing the specifid control.

Remarks

Use the GetRenderResult method to obtain the HTML code representing a specific control. This method can be used in a handler of the ASPxCallback.Callback event to render the required web control after it’s been updated on the server side. The obtained HTML code can then be assigned to the event’s CallbackEventArgs.Result property, and sent to the client-side ASPxClientCallback.CallbackComplete event. On the client side, this code (obtained via the ASPxClientCallbackCompleteEventArgs.result parameter) can be used to replace/update the required control’s HTML representation.

Example

The complete sample project is available in the DevExpress Code Central database at E36.

JS

function ShowImage(id) {
    if (ASPxCallback1.InCallback()) 
        return;
    document.getElementById('imageCell').innerHTML = 'Loading...';
    ASPxCallback1.PerformCallback(id);
}

ASPX

<script runat="server">
     protected void Page_Load(object sender, EventArgs e) {

     }
     protected void ASPxCallback1_Callback(object source, 
         DevExpress.Web.CallbackEventArgs e) {
         string xpath = string.Format("//items/item[@id='{0}']", e.Parameter);
         XmlNode node = XmlDataSource2.GetXmlDocument().SelectSingleNode(xpath);
         if(node != null) {
             LargeImage.ImageUrl = "Images/" + node.Attributes["FileName"].Value;
             LargeImage.AlternateText = node.Attributes["Text"].Value;
             LargeImageText.Text = node.Attributes["Text"].Value; 
         }
         e.Result = ASPxCallback.GetRenderResult(ImagePanel);
     }
 }
</script>

...
         <dxcb:ASPxCallback ID="ASPxCallback1" runat="server" 
             OnCallback="ASPxCallback1_Callback">
             <ClientSideEvents CallbackComplete="function(s, e) {
     document.getElementById('imageCell').innerHTML = e.result;
 }" />
         </dxcb:ASPxCallback>
...