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//------------------------------------------------------------------------------
// <copyright file="CustomValidator.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
namespace System.Web.UI.WebControls {
using System.ComponentModel;
using System.Web;
using System.Web.Util;
/// <devdoc>
/// <para> Allows custom code to perform
/// validation on the client and/or server.</para>
/// </devdoc>
[
DefaultEvent("ServerValidate"),
ToolboxData("<{0}:CustomValidator runat=\"server\" ErrorMessage=\"CustomValidator\"></{0}:CustomValidator>")
]
public class CustomValidator : BaseValidator {
private static readonly object EventServerValidate= new object();
/// <devdoc>
/// <para>Gets and sets the custom client Javascript function used
/// for validation.</para>
/// </devdoc>
[
WebCategory("Behavior"),
Themeable(false),
DefaultValue(""),
WebSysDescription(SR.CustomValidator_ClientValidationFunction)
]
public string ClientValidationFunction {
get {
object o = ViewState["ClientValidationFunction"];
return((o == null) ? String.Empty : (string)o);
}
set {
ViewState["ClientValidationFunction"] = value;
}
}
[
WebCategory("Behavior"),
Themeable(false),
DefaultValue(false),
WebSysDescription(SR.CustomValidator_ValidateEmptyText),
]
public bool ValidateEmptyText {
get {
object o = ViewState["ValidateEmptyText"];
return((o == null) ? false : (bool)o);
}
set {
ViewState["ValidateEmptyText"] = value;
}
}
/// <devdoc>
/// <para>Represents the method that will handle the
/// <see langword='ServerValidate'/> event of a
/// <see cref='System.Web.UI.WebControls.CustomValidator'/>.</para>
/// </devdoc>
[
WebSysDescription(SR.CustomValidator_ServerValidate)
]
public event ServerValidateEventHandler ServerValidate {
add {
Events.AddHandler(EventServerValidate, value);
}
remove {
Events.RemoveHandler(EventServerValidate, value);
}
}
/// <internalonly/>
/// <devdoc>
/// <para>Adds the properties of the <see cref='System.Web.UI.WebControls.CustomValidator'/> control to the
/// output stream for rendering on the client.</para>
/// </devdoc>
protected override void AddAttributesToRender(HtmlTextWriter writer) {
base.AddAttributesToRender(writer);
if (RenderUplevel) {
string id = ClientID;
HtmlTextWriter expandoAttributeWriter = (EnableLegacyRendering || IsUnobtrusive) ? writer : null;
AddExpandoAttribute(expandoAttributeWriter, id, "evaluationfunction", "CustomValidatorEvaluateIsValid", false);
if (ClientValidationFunction.Length > 0) {
AddExpandoAttribute(expandoAttributeWriter, id, "clientvalidationfunction", ClientValidationFunction);
if (ValidateEmptyText) {
AddExpandoAttribute(expandoAttributeWriter, id, "validateemptytext", "true", false);
}
}
}
}
/// <internalonly/>
/// <devdoc>
/// <para>Checks the properties of the control for valid values.</para>
/// </devdoc>
protected override bool ControlPropertiesValid() {
// Need to override the BaseValidator implementation, because for CustomValidator, it is fine
// for the ControlToValidate to be blank.
string controlToValidate = ControlToValidate;
if (controlToValidate.Length > 0) {
// Check that the property points to a valid control. Will throw and exception if not found
CheckControlValidationProperty(controlToValidate, "ControlToValidate");
}
return true;
}
/// <internalonly/>
/// <devdoc>
/// EvaluateIsValid method
/// </devdoc>
protected override bool EvaluateIsValid() {
// If no control is specified, we always fire the event. If they have specified a control, we
// only fire the event if the input is non-blank.
string controlValue = String.Empty;
string controlToValidate = ControlToValidate;
if (controlToValidate.Length > 0) {
controlValue = GetControlValidationValue(controlToValidate);
Debug.Assert(controlValue != null, "Should have been caught be property check");
// If the text is empty, we return true. Whitespace is ignored for coordination wiht
// RequiredFieldValidator.
if ((controlValue == null || controlValue.Trim().Length == 0) &&
!ValidateEmptyText) {
return true;
}
}
return OnServerValidate(controlValue);
}
/// <devdoc>
/// <para>Raises the
/// <see langword='ServerValidate'/> event for the <see cref='System.Web.UI.WebControls.CustomValidator'/>.</para>
/// </devdoc>
protected virtual bool OnServerValidate(string value) {
ServerValidateEventHandler handler = (ServerValidateEventHandler)Events[EventServerValidate];
ServerValidateEventArgs args = new ServerValidateEventArgs(value, true);
if (handler != null) {
handler(this, args);
return args.IsValid;
}
else {
return true;
}
}
}
}
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