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How to: Use the client PerformDataCallback method and the server CustomDataCallback event
This example demonstrates how the CustomDataCallback event can be used to save the ASPxHtmlEditor's content data on the server side without generating a postback and refreshing the entire page. The server CustomDataCallback event is initiated by a callback sent by the editor's client PerformDataCallback method. Saved data is maintained within the Session object and can be restored back to the editor, if required.
So, the CustomDataCallback event allows you to process the editor's data obtained from the client on the server side, and to return the required processing result back to the client side, without rerendering the ASPxHtmlEditor control.
| ASP.NET:Default.aspx |
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="HtmlEditorSaveHtml.Default" %>
<%@ Register Assembly="DevExpress.Web.v9.2" Namespace="DevExpress.Web.ASPxLoadingPanel" TagPrefix="dxlp" %>
<%@ Register Assembly="DevExpress.Web.ASPxEditors.v9.2" Namespace="DevExpress.Web.ASPxEditors" TagPrefix="dxe" %>
<%@ Register Assembly="DevExpress.Web.ASPxSpellChecker.v9.2" Namespace="DevExpress.Web.ASPxSpellChecker" TagPrefix="dxwsc" %>
<%@ Register Assembly="DevExpress.Web.ASPxHtmlEditor.v9.2" Namespace="DevExpress.Web.ASPxHtmlEditor" TagPrefix="dxhe" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>Untitled Page</title>
<script type="text/javascript">
function OnCustomCommand(htmlEditor, e){
if(htmlEditor.InCallback())
return;
switch(e.commandName){
case "load":
htmlEditor.PerformDataCallback(e.commandName, LoadContent);
SetStatusText("Loading…");
break;
case "save":
htmlEditor.PerformDataCallback(e.commandName, SaveCompleted);
SetStatusText("Saving…");
break;
}
}
function SetStatusText(text){
lbStatusText.SetText(text);
}
function LoadContent(htmlEditor, result){
if(result != null)
htmlEditor.SetHtml(result);
SetStatusText("");
}
function SaveCompleted(){
SetStatusText("");
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<div style="height: 25px;">
<dxe:ASPxLabel ID="ASPxLabel1" runat="server" ClientInstanceName="lbStatusText" BackColor="Info" />
</div>
<dxhe:ASPxHtmlEditor ID="ASPxHtmlEditor1" ClientInstanceName="htmlEditor" runat="server"
OnCustomDataCallback="ASPxHtmlEditor1_CustomDataCallback">
<SettingsImageUpload>
<ValidationSettings AllowedContentTypes="image/jpeg, image/pjpeg, image/gif, image/png, image/x-png">
</ValidationSettings>
</SettingsImageUpload>
<Toolbars>
<dxhe:StandardToolbar1>
<Items>
<dxhe:ToolbarCutButton>
</dxhe:ToolbarCutButton>
<dxhe:ToolbarCopyButton>
</dxhe:ToolbarCopyButton>
<dxhe:ToolbarPasteButton>
</dxhe:ToolbarPasteButton>
<dxhe:ToolbarPasteFromWordButton>
</dxhe:ToolbarPasteFromWordButton>
<dxhe:ToolbarUndoButton BeginGroup="True">
</dxhe:ToolbarUndoButton>
<dxhe:ToolbarRedoButton>
</dxhe:ToolbarRedoButton>
<dxhe:ToolbarRemoveFormatButton BeginGroup="True">
</dxhe:ToolbarRemoveFormatButton>
<dxhe:ToolbarSuperscriptButton BeginGroup="True">
</dxhe:ToolbarSuperscriptButton>
<dxhe:ToolbarSubscriptButton>
</dxhe:ToolbarSubscriptButton>
<dxhe:ToolbarInsertOrderedListButton BeginGroup="True">
</dxhe:ToolbarInsertOrderedListButton>
<dxhe:ToolbarInsertUnorderedListButton>
</dxhe:ToolbarInsertUnorderedListButton>
<dxhe:ToolbarIndentButton BeginGroup="True">
</dxhe:ToolbarIndentButton>
<dxhe:ToolbarOutdentButton>
</dxhe:ToolbarOutdentButton>
<dxhe:ToolbarInsertLinkDialogButton BeginGroup="True">
</dxhe:ToolbarInsertLinkDialogButton>
<dxhe:ToolbarUnlinkButton>
</dxhe:ToolbarUnlinkButton>
<dxhe:ToolbarInsertImageDialogButton>
</dxhe:ToolbarInsertImageDialogButton>
</Items>
</dxhe:StandardToolbar1>
<dxhe:StandardToolbar2>
<Items>
<dxhe:ToolbarBoldButton BeginGroup="True">
</dxhe:ToolbarBoldButton>
<dxhe:ToolbarItalicButton>
</dxhe:ToolbarItalicButton>
<dxhe:ToolbarUnderlineButton>
</dxhe:ToolbarUnderlineButton>
<dxhe:ToolbarStrikethroughButton>
</dxhe:ToolbarStrikethroughButton>
<dxhe:ToolbarJustifyLeftButton BeginGroup="True">
</dxhe:ToolbarJustifyLeftButton>
<dxhe:ToolbarJustifyCenterButton>
</dxhe:ToolbarJustifyCenterButton>
<dxhe:ToolbarJustifyRightButton>
</dxhe:ToolbarJustifyRightButton>
<dxhe:ToolbarJustifyFullButton>
</dxhe:ToolbarJustifyFullButton>
<dxhe:ToolbarBackColorButton BeginGroup="True">
</dxhe:ToolbarBackColorButton>
<dxhe:ToolbarFontColorButton>
</dxhe:ToolbarFontColorButton>
</Items>
</dxhe:StandardToolbar2>
<dxhe:CustomToolbar>
<Items>
<dxhe:CustomToolbarButton CommandName="load" Text="Load" ToolTip="Loading saved text" BeginGroup="true">
</dxhe:CustomToolbarButton>
<dxhe:CustomToolbarButton CommandName="save" Text="Save" ToolTip="Save text" >
</dxhe:CustomToolbarButton>
</Items>
</dxhe:CustomToolbar>
</Toolbars>
<ClientSideEvents CustomCommand="OnCustomCommand"></ClientSideEvents>
</dxhe:ASPxHtmlEditor>
<br />
<br />
</div>
</form>
</body>
</html>
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| C#:Default.aspx.cs |
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
namespace HtmlEditorSaveHtml {
public partial class Default : System.Web.UI.Page {
protected void Page_Load(object sender, EventArgs e) {
}
protected void ASPxHtmlEditor1_CustomDataCallback(object sender, DevExpress.Web.ASPxClasses.CustomDataCallbackEventArgs e) {
switch(e.Parameter) {
case "save":
SetHtml();
break;
case "load":
e.Result = GetHtml();
break;
}
}
private string GetHtml() {
object html = Session["html"];
if(html == null)
return "There isn`t saved document";
else
return html.ToString();
}
private void SetHtml() {
Session["html"] = ASPxHtmlEditor1.Html;
}
}
}
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| VB:Default.aspx.vb |
Imports Microsoft.VisualBasic
Imports System
Imports System.Data
Imports System.Configuration
Imports System.Collections
Imports System.Web
Imports System.Web.Security
Imports System.Web.UI
Imports System.Web.UI.WebControls
Imports System.Web.UI.WebControls.WebParts
Imports System.Web.UI.HtmlControls
Namespace HtmlEditorSaveHtml
Partial Public Class [Default]
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
End Sub
Protected Sub ASPxHtmlEditor1_CustomDataCallback(ByVal sender As Object, ByVal e As DevExpress.Web.ASPxClasses.CustomDataCallbackEventArgs)
Select Case e.Parameter
Case "save"
SetHtml()
Case "load"
e.Result = GetHtml()
End Select
End Sub
Private Function GetHtml() As String
Dim html As Object = Session("html")
If html Is Nothing Then
Return "There isn`t saved document"
Else
Return html.ToString()
End If
End Function
Private Sub SetHtml()
Session("html") = ASPxHtmlEditor1.Html
End Sub
End Class
End Namespace
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