自动具有水印和日历选择功能的文本框

来源：互联网发布：图像识别算法编辑：程序博客网时间：2024/06/05 14:44

这是我在项目中做的一个自定义控件.

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using System;using System.Web.UI;using System.Web.UI.WebControls;namespace WorkflowCenter.Abstraction{///这个文本框自动具有水印功能和日历选择功能///作者：陈希章///要求：需要AJAXToolkit支持    public class DataTimeTextBox : Control, IPostBackDataHandler    {        protected override void OnInit(EventArgs e)        {            base.OnInit(e);            Page.RegisterRequiresControlState(this);            Page.RegisterRequiresPostBack(this);        }        protected override object SaveControlState()        {            return Date;        }        protected override void LoadControlState(object savedState)        {            if (savedState == null) return;            Date = (DateTime)savedState;        }        protected TextBox tx;        protected AjaxControlToolkit.CalendarExtender ex;        protected AjaxControlToolkit.TextBoxWatermarkExtender WatermarkTextBox;        protected RequiredFieldValidator rv;        protected CompareValidator cv;        protected override void CreateChildControls()        {            Controls.Clear();            //添加四个控件            tx = new TextBox();            string id = this.ID + "_DateTextBox";            tx.ID = id;            ex = new AjaxControlToolkit.CalendarExtender();            ex.ID = this.ID + "_CalendarExtender";            ex.TargetControlID = tx.ID;            ex.Format = "yyyy-MM-dd";            WatermarkTextBox = new AjaxControlToolkit.TextBoxWatermarkExtender();            WatermarkTextBox.ID = this.ID + "_WaterMark";            WatermarkTextBox.TargetControlID = tx.ID;            WatermarkTextBox.WatermarkText = "请选择日期";            WatermarkTextBox.WatermarkCssClass = "Watermark";            rv = new RequiredFieldValidator();            rv.ID = this.ID + "_RequiredValidator";            rv.ControlToValidate = tx.ID;            rv.ErrorMessage = "请输入日期";            rv.Text = "*";            rv.Display = ValidatorDisplay.Dynamic;            cv = new CompareValidator();            cv.ID = this.ID + "_CompareValidator";            cv.ErrorMessage = "请输入一个合法的日期";            cv.Text = "*";            cv.Display = ValidatorDisplay.Dynamic;            cv.ControlToValidate = tx.ID;            cv.Operator = ValidationCompareOperator.DataTypeCheck;            cv.Type = ValidationDataType.Date;            this.Controls.Add(tx);            this.Controls.Add(ex);            this.Controls.Add(WatermarkTextBox);            this.Controls.Add(rv);            this.Controls.Add(cv);            ClearChildViewState();        }        public DateTime Date { get; set; }        #region IPostBackDataHandler 成员        public bool LoadPostData(string postDataKey, System.Collections.Specialized.NameValueCollection postCollection)        {            EnsureChildControls();            DateTime temp;            if (DateTime.TryParse(postCollection[tx.UniqueID], out temp))                Date = temp;            return true;        }        public void RaisePostDataChangedEvent()        {        }        #endregion    }}

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页面中使用的代码

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication3._Default" %>DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><%@ Register Assembly="WorkflowCenter.Abstraction" Namespace="WorkflowCenter.Abstraction" TagPrefix="workflow" %><html xmlns="http://www.w3.org/1999/xhtml"><head runat="server">    <title>title>    <style type="text/css">        .Watermark        {            color: Gray;        }    style>head><body>    <form id="form1" runat="server">    <div>        <asp:ScriptManager ID="s" runat="server">        asp:ScriptManager>        <asp:ValidationSummary ID="sum" runat="server" />        <workflow:DataTimeTextBox ID="date" runat="server">workflow:DataTimeTextBox>        <asp:Button ID="b" runat="server" Text="测试" OnClick="b_Click" />    div>    form>body>html>