Asp.net 2.0 揭秘---标准控件
label --属性
tooltip
Cssclass
label 控件呈现 <span> 使用AsssociatedControlID 后会以<label>呈现。
literal-----不包含在任何<span>标签内。
备注：可以使用该控件输出动态html。
TextBox
Accesskey-----------Alt+属性值（A、B。。。。）
*设置控件焦点
.Focus方法
Page.Focus();
HtmlForm控件的DefaultFocus()
**
PostBackUrl
Page.PrePage 来获取前一页面。
***
Form：defaultButton.
***
验证控件不是可靠的，所以在验证时候，不只要在页面进行脚本验证，还要在服务器端进行验证。
添加Page.IsValid的验证。
***
验证控件的Text属性可以是HTML代码
<asp:RequiredFieldValidator Text="<img src='' alt='name'/>"/>
SetFocusOnError属性，在发生错误的时候，表单焦点自动转移
Void Page_PreRender()
{
Foreach(BaseValidator val in Page.Validators)
{
WebContorl = //获取每个验证控件的关联控件。
If (!Val.IsValid)
{
//设置控件颜色。
}
}
}
***
禁用验证控件
Causevalidation false
***
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server"
ControlToValidate="DropDownList1" ErrorMessage="RequiredFieldValidator" InitialValue="none"></asp:RequiredFieldValidator>
可以对dropdownlist进行验证。
***
function valComments_ClientValidate(source,args)
{
if(args.Value.length > 10)
args.IsValid = false;
else
args.IsValid = true;
}
protected void CustomValidator1_ServerValidate(object source, ServerValidateEventArgs args)
{
if (args.Value.Length > 10)
args.IsValid = false;
else
args.IsValid = true;
}
***
ValidateEmptyText ="true"
可以对空字符串进行验证。
CustomValidator ControlToValidate属性不是必须的。
当提交表单的时候，可以使用CustomValidator1_ServerValidate进行验证。
*** 自定义验证控件
public class LenghtValidator : BaseValidator
{
private int _maxMumLenght = 0;
public int MaxMumLenght
{
get { return _maxMumLenght; }
set { _maxMumLenght = value; }
}
protected override bool EvaluateIsValid()
{
String value = this.GetControlValidationValue(this.ControlToValidate);
if (value.Length > _maxMumLenght)
return false;
else
return true;
}
}
*** 回调
Code
/// <summary>
/// Enables you to perform custom validation on both the client and server
/// </summary>
public class AjaxValidator : BaseValidator, ICallbackEventHandler
{
public event ServerValidateEventHandler ServerValidate;
string _controlToValidateValue;
protected override void OnPreRender(EventArgs e)
{
String eventRef = Page.ClientScript.GetCallbackEventReference(this, "", "", "");
// Register include file
String includeScript = Page.ResolveClientUrl("~/ClientScripts/AjaxValidator.js");
Page.ClientScript.RegisterClientScriptInclude("AjaxValidator", includeScript);
// Register startup script
String startupScript = String.Format("document.getElementById('{0}').evaluationfunction = 'AjaxValidatorEvaluateIsValid';", this.ClientID);
Page.ClientScript.RegisterStartupScript(this.GetType(), "AjaxValidator", startupScript, true);
base.OnPreRender(e);
}
/// <summary>
/// Only do the AJAX on browsers that support it
/// </summary>
protected override bool DetermineRenderUplevel()
{
return Context.Request.Browser.SupportsCallback;
}
/// <summary>
/// Server method called by client AJAX call
/// </summary>
public string GetCallbackResult()
{
return ExecuteValidationFunction(_controlToValidateValue).ToString();
}
/// <summary>
/// Return callback result to client
/// </summary>
public void RaiseCallbackEvent(string eventArgument)
{
_controlToValidateValue = eventArgument;
}
/// <summary>
/// Server-side method for validation
/// </summary>
protected override bool EvaluateIsValid()
{
string controlToValidateValue = this.GetControlValidationValue(this.ControlToValidate);
return ExecuteValidationFunction(controlToValidateValue);
}
/// <summary>
/// Performs the validation for both server and client
/// </summary>
private bool ExecuteValidationFunction(String controlToValidateValue)
{
ServerValidateEventArgs args = new ServerValidateEventArgs(controlToValidateValue, this.IsValid);
if (ServerValidate != null)
ServerValidate(this, args);
return args.IsValid;
}
}