в 15:30, 26 мая 2010

2010-05-26T15:30:57Z

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2010-05-26T12:00:20Z

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== Adding an asynchronous callback to validate data (C#)==



<source lang="csharp">
using System;
using System.Collections.Generic;
using System.ruponentModel;
using System.Text;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace WebControlLibrary1
{
[DefaultProperty("Text")]
[ToolboxData("<{0}:WebCustomControl1 runat=server></{0}:WebCustomControl1>")]
public class WebCustomControl1 : WebControl, ICallbackEventHandler
{
private string text;
[Bindable(true)]
[Category("Appearance")]
[DefaultValue("")]
[Themeable(false)]
public string Text
{
get
{
return text;
}
set
{
text = value;
}
}
protected override void Render(HtmlTextWriter output)
{
output.RenderBeginTag(HtmlTextWriterTag.Div);
output.AddAttribute(HtmlTextWriterAttribute.Type, "text");
output.AddAttribute(HtmlTextWriterAttribute.Id, this.ClientID);
output.AddAttribute(HtmlTextWriterAttribute.Name, this.ClientID);
output.AddAttribute(HtmlTextWriterAttribute.Value, this.Text);
output.AddAttribute("OnBlur", "ClientCallback();");
this.AddAttributesToRender(output);
output.RenderBeginTag(HtmlTextWriterTag.Input);
output.RenderEndTag();
output.RenderEndTag();
}
protected override void OnPreRender(EventArgs e)
{
Page.ClientScript.RegisterStartupScript(
typeof(Page),
"ControlFocus", "document.getElementById("" + this.ClientID + "").focus();",
true);
Page.ClientScript.RegisterStartupScript(
typeof(Page), "ClientCallback",
"function ClientCallback() {" +
"args=document.getElementById("" + this.ClientID + "").value;" +
Page.ClientScript.GetCallbackEventReference(this, "args",
"CallbackHandler", null, "ErrorHandler", true) + "}",
true);
}
#region ICallbackEventHandler Members
public void RaiseCallbackEvent(string eventArgument)
{
int result;
if (!Int32.TryParse(eventArgument, out result))
throw new Exception("The method or operation is not implemented.");
}
public string GetCallbackResult()
{
return "Valid Data";
}
#endregion

}
}</source>

== Adding an asynchronous callback to validate data (VB)==



<source lang="csharp">
Imports System.ruponentModel
Imports System.Web.UI
<DefaultProperty("Text"), _
ToolboxData("<{0}:WebCustomControl1 runat=server></{0}:WebCustomControl1>")> _
Public Class WebCustomControl1
Inherits System.Web.UI.WebControls.WebControl
Implements System.Web.UI.ICallbackEventHandler
Dim _text As String
<Bindable(True), Category("Appearance"), Themeable(False), DefaultValue("")> _
Property [Text]() As String
Get
Return _text
End Get
Set(ByVal Value As String)
_text = Value
End Set
End Property

Protected Overrides Sub Render(ByVal output As System.Web.UI.HtmlTextWriter)
output.RenderBeginTag(HtmlTextWriterTag.Div)
output.AddAttribute(HtmlTextWriterAttribute.Type, "text")
output.AddAttribute(HtmlTextWriterAttribute.Id, Me.ClientID)
output.AddAttribute(HtmlTextWriterAttribute.Name, Me.ClientID)
output.AddAttribute(HtmlTextWriterAttribute.Value, Me.Text)
output.AddAttribute("OnBlur", "ClientCallback();")
Me.AddAttributesToRender(output)
output.RenderBeginTag(HtmlTextWriterTag.Input)
output.RenderEndTag()
output.RenderEndTag()
End Sub
Protected Overrides Sub OnPreRender(ByVal e As System.EventArgs)
Page.ClientScript.RegisterStartupScript(GetType(Page), _
"ControlFocus", "document.getElementById("" & Me.ClientID & "").focus();", _
True)
Page.ClientScript.RegisterStartupScript( _
GetType(Page), "ClientCallback", _
"function ClientCallback() {" & _
"args=document.getElementById("" & Me.ClientID & "").value;" & _
Page.ClientScript.GetCallbackEventReference(Me, "args", _
"CallbackHandler", Nothing, "ErrorHandler", True) + "}", _
True)
End Sub

Public Sub RaiseCallbackEvent(ByVal eventArgument As String) Implements System.Web.UI.ICallbackEventHandler.RaiseCallbackEvent
Dim result As Int32
If (Not Int32.TryParse(eventArgument, result)) Then
Throw New Exception("The method or operation is not implemented.")
End If
End Sub
Public Function GetCallbackResult() As String Implements ICallbackEventHandler.GetCallbackResult
Return "Valid Data"
End Function
End Class</source>

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ASP.NET Tutorial/Custom Controls/Validation - История изменений

в 15:30, 26 мая 2010

Admin: 1 версия