81 lines
2.8 KiB
C#
81 lines
2.8 KiB
C#
//------------------------------------------------------------------------------
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// <copyright file="RequiredFieldValidator.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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//------------------------------------------------------------------------------
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/*
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*/
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namespace System.Web.UI.WebControls {
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using System.ComponentModel;
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using System.Web;
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using System.Web.Util;
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/// <devdoc>
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/// <para> Checks if the value of
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/// the associated input control is different from its initial value.</para>
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/// </devdoc>
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[
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ToolboxData("<{0}:RequiredFieldValidator runat=\"server\" ErrorMessage=\"RequiredFieldValidator\"></{0}:RequiredFieldValidator>")
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]
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public class RequiredFieldValidator : BaseValidator {
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/// <devdoc>
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/// <para>Gets or sets the initial value of the associated input control.</para>
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/// </devdoc>
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[
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WebCategory("Behavior"),
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Themeable(false),
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DefaultValue(""),
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WebSysDescription(SR.RequiredFieldValidator_InitialValue)
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]
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public string InitialValue {
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get {
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object o = ViewState["InitialValue"];
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return((o == null) ? String.Empty : (string)o);
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}
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set {
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ViewState["InitialValue"] = value;
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}
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}
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/// <internalonly/>
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/// <devdoc>
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/// AddAttributesToRender method
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/// </devdoc>
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protected override void AddAttributesToRender(HtmlTextWriter writer) {
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base.AddAttributesToRender(writer);
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if (RenderUplevel) {
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string id = ClientID;
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HtmlTextWriter expandoAttributeWriter = (EnableLegacyRendering || IsUnobtrusive) ? writer : null;
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AddExpandoAttribute(expandoAttributeWriter, id, "evaluationfunction", "RequiredFieldValidatorEvaluateIsValid", false);
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AddExpandoAttribute(expandoAttributeWriter, id, "initialvalue", InitialValue);
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}
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}
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/// <internalonly/>
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/// <devdoc>
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/// EvaluateIsValid method
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/// </devdoc>
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protected override bool EvaluateIsValid() {
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// Get the control value, return true if it is not found
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string controlValue = GetControlValidationValue(ControlToValidate);
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if (controlValue == null) {
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Debug.Fail("Should have been caught by PropertiesValid check");
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return true;
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}
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// See if the control has changed
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return(!controlValue.Trim().Equals(InitialValue.Trim()));
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}
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}
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}
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