ExtAspNet应用技巧(二)

ExtAspNet应用中,如何获取FCKEditor的值以及如何设置FCKEditor的值?

首先把例子的截图放上来:
点击“设置FCKEditor的值”后的界面效果:

点击获取FCKEditor的值后的效果:


示例的Asp.Net代码:
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="fckeditor_run.aspx.cs"
    
ValidateRequest="false" Inherits="ExtAspNet.Examples.aspnet.fckeditor_run" %>

<%@ Register Assembly="FredCK.FCKeditorV2" Namespace="FredCK.FCKeditorV2" TagPrefix="FCKeditorV2" %>
<!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 runat="server">
    
<title></title>
</head>
<body>
    
<form id="form1" runat="server">
    
<ext:PageManager ID="PageManager1" runat="server" />
    
<ext:ContentPanel ID="ContentPanel1" runat="server" BodyPadding="5px" EnableBackgroundColor="true"
        ShowBorder
="true" ShowHeader="true" Title="ContentPanel">
        
        
<FCKeditorV2:FCKeditor ID="FCKeditor1" BasePath="../fckeditor/"  runat="server">
        
</FCKeditorV2:FCKeditor>
        
    
</ext:ContentPanel>
    
<ext:Button ID="Button1" runat="server" Text="获取FCKEditor的值" OnClick="Button1_Click">
    
</ext:Button>
    
<br />
    
<ext:Button ID="Button2" runat="server" Text="设置FCKEditor的值" OnClick="Button2_Click">
    
</ext:Button>
    
</form>
</body>
</html>

后台代码:
protected void Button1_Click(object sender, EventArgs e)
{
    Alert.Show(FCKeditor1.Value);
}

protected void Button2_Click(object sender, EventArgs e)
{
    FCKeditor1.Value 
= "哈哈,不错哦<strong>这是黑体</strong>";

    PageManager1.AddAjaxUpdateControl(FCKeditor1);
}

你可以从 http://extaspnet.codeplex.com/SourceControl/ListDownloadableCommits.aspx 下载最新的源代码,
示例页面在 trunk\ExtAspNet.Examples\aspnet\fckeditor_run.aspx


=====================================================================
以下内容属于高级部分,涉及部分内部实现机制。
为了达到以上目的,我们对FredCK.FCKeditorV2中的FCKeditor.cs进行了修改,原来的代码:
protected override void OnPreRender( EventArgs e )
{
    
base.OnPreRender( e );
    
    _IsCompatible 
= this.CheckBrowserCompatibility();

    
if ( !_IsCompatible )
        
return;

    
object oScriptManager = null;

    
// Search for the ScriptManager control in the page.
    Control oParent = this.Parent;
    
while ( oParent != null )
    {
        
foreach ( object control in oParent.Controls )
        {
            
// Match by type name.
            if ( control.GetType().FullName == "System.Web.UI.ScriptManager" )
            {
                oScriptManager 
= control;
                
break;
            }
        }

        
if ( oScriptManager != null )
            
break;

        oParent 
= oParent.Parent;
    }

    
// If the ScriptManager control is available.
    if ( oScriptManager != null )
    {
        
try
        {
            
// Use reflection to check the SupportsPartialRendering
            
// property value.
            bool bSupportsPartialRendering = ((bool)(oScriptManager.GetType().GetProperty( "SupportsPartialRendering" ).GetValue( oScriptManager, null )));

            
if ( bSupportsPartialRendering )
            {
                string sScript = "(function()\n{\n" +
                    
"\tvar editor = FCKeditorAPI.GetInstance('" + this.ClientID + "');\n" +
                    
"\tif (editor)\n" +
                    
"\t\teditor.UpdateLinkedField();\n" +
                    
"})();\n"
;

                
// Call the RegisterOnSubmitStatement method through
                
// reflection.
                oScriptManager.GetType().GetMethod( "RegisterOnSubmitStatement"new Type[] { typeof( Control ), typeof( Type ), typeof( String ), typeof( String ) } ).Invoke( oScriptManager, new object[] {
                    
this,
                    
this.GetType(),
                    
"FCKeditorAjaxOnSubmit_" + this.ClientID,
                    sScript } );

                
// Tell the editor that we are handling the submit.
                this.Config[ "PreventSubmitHandler" ] = "true";
            }
        }
        
catch { }
    }
}

可以看到其中有支持Asp.Net AJAX的代码,大概的意思是:
如果页面中启用了Asp.Net AJAX,也就是存在 System.Web.UI.ScriptManager 控件,并且的控件的属性SupportsPartialRendering为true.
此时调用此控件的RegisterOnSubmitStatement方法注册一段脚本 sScript  ,在提交表单之前更新FCKEditor隐藏的input的值,只有这样才能
讲FCKEditor的值传递到服务器处理程序。
我们看下页面中生成的HTML代码就更清楚了:
<div>
<input type="hidden" id="ContentPanel1_FCKeditor1" name="ContentPanel1$FCKeditor1" value="" />
<input type="hidden" id="ContentPanel1_FCKeditor1___Config" value="PreventSubmitHandler=true&amp;HtmlEncodeOutput=true" />
<iframe id="ContentPanel1_FCKeditor1___Frame" src="../fckeditor/editor/fckeditor.html?InstanceName=ContentPanel1_FCKeditor1&amp;Toolbar=Default" width="100%" height="200px" frameborder="no" scrolling="no"></iframe>
</div>

然后我们就照葫芦画瓢,也提供对ExtAspNet AJAX的支持,如下所示:
protected override void OnPreRender(EventArgs e)
{
    
base.OnPreRender(e);

    _IsCompatible 
= this.CheckBrowserCompatibility();

    
if (!_IsCompatible)
        
return;

    
object oScriptManager = GetPageControl("System.Web.UI.ScriptManager");

    
// If the ScriptManager control is available.
    if (oScriptManager != null)
    {
        
try
        {
            
// Use reflection to check the SupportsPartialRendering
            
// property value.
            bool bSupportsPartialRendering = ((bool)(oScriptManager.GetType().GetProperty("SupportsPartialRendering").GetValue(oScriptManager, null)));

            
if (bSupportsPartialRendering)
            {
                
string sScript = "(function()\n{\n" +
                    
"\tvar editor = FCKeditorAPI.GetInstance('" + this.ClientID + "');\n" +
                    
"\tif (editor)\n" +
                    
"\t\teditor.UpdateLinkedField();\n" +
                    
"})();\n";

                
// Call the RegisterOnSubmitStatement method through
                
// reflection.
                oScriptManager.GetType().GetMethod("RegisterOnSubmitStatement"new Type[] { typeof(Control), typeof(Type), typeof(String), typeof(String) }).Invoke(oScriptManager, new object[] {
                    
this,
                    
this.GetType(),
                    
"FCKeditorAjaxOnSubmit_" + this.ClientID,
                    sScript });

                
// Tell the editor that we are handling the submit.
                this.Config["PreventSubmitHandler"= "true";
            }
        }
        
catch { }
    }


    
object extPageManager = GetPageControl("ExtAspNet.PageManager");
    
if (extPageManager != null)
    {
        
try
        {
            
bool enableAjax = ((bool)(extPageManager.GetType().GetProperty("EnableAjax").GetValue(extPageManager, null)));

            
if (enableAjax)
            {
                
string sScript = "(function()\n{\n" +
                    
"\tvar editor = FCKeditorAPI.GetInstance('" + this.ClientID + "');\n" +
                    
"\tif (editor)\n" +
                    
"\t\teditor.UpdateLinkedField();\n" +
                    
"})();\n";

                extPageManager.GetType().GetMethod(
"RegisterOnAjaxPostBack"new Type[] { typeof(String), typeof(String) }).Invoke(extPageManager, new object[] {
                    
"FCKeditorAjaxOnSubmit_" + this.ClientID,
                    sScript });

                
// Tell the editor that we are handling the submit.
                this.Config["PreventSubmitHandler"= "true";
            }
        }
        
catch { }
    }
}

private object GetPageControl(string fullName)
{
    
object oScriptManager = null;

    
// Search for the ScriptManager control in the page.
    Control oParent = this.Parent;
    
while (oParent != null)
    {
        
foreach (object control in oParent.Controls)
        {
            
// Match by type name.
            if (control.GetType().FullName == fullName)
            {
                oScriptManager 
= control;
                
break;
            }
        }

        
if (oScriptManager != null)
            
break;

        oParent 
= oParent.Parent;
    }
    
return oScriptManager;
}

还有我们还对Render函数进行了修正(为了使用PageManager1.AddAjaxUpdateControl(FCKeditor1);),
具体就不讲解了,有兴趣的话可以看下源代码。
happy coding.
posted @ 2009-07-21 23:15  三生石上(FineUI控件)  阅读(5753)  评论(6编辑  收藏  举报