带提示的输入文本框ASP.NET服务器控件

带提示的输入文本框ASP.NET服务器控件

需要设置的属性如下：

效果如下：

代码如下：

Code
using System;
using System.Collections.Generic;
using System.Text;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.ComponentModel;
using System.Web;
[assembly: WebResource("Liping.HintTextBox.Image.ydot.png", "image/gif")]
[assembly: WebResource("Liping.HintTextBox.Image.hintdownbottom.gif", "image/gif")]
[assembly: WebResource("Liping.HintTextBox.Image.hintdowntop.gif", "image/gif")]
[assembly: WebResource("Liping.HintTextBox.Image.hintupbottom.gif", "image/gif")]
[assembly: WebResource("Liping.HintTextBox.Image.hintuptop.gif", "image/gif")]
[assembly: WebResource("Liping.HintTextBox.script.hintJS.js", "application/javascript")]
namespace Liping.HintTextBox
{
    [ToolboxData("<{0}:HintTextBox runat=server></{0}:HintTextBox>")]
    public class HintTextBox : WebControl, IPostBackDataHandler
    {
        #region 字段属性
        private string text;//文本框值
        /// <summary>
        /// 获取或设置文本
        /// </summary>
        [Description("设置文本值")]
        public string Text
        {
            get { return text; }
            set { text = value; }
        }

        private string hintText = "这是地球人都知道的东西，没什么好提示的。";//提示信息
        /// <summary>
        /// 获取或设置提示信息
        /// </summary>
        [Description("设置指示信息")]
        public string HintText
        {
            get { return hintText; }
            set { hintText = value; }
        }

        private int aspect;//朝向，有：up down
        /// <summary>
        /// 获取或设置提示框朝向:0为下1为上
        /// </summary>
        [Description("设置提示框朝向:0为下1为上")]
        public int Aspect
        {
            get { return aspect; }
            set { aspect = value; }
        }

        #region 提示框图片字段、属性



        private string hintBorderColor = "000000";//提示框边框颜色
        /// <summary>
        /// 获取或设置提示框边框颜色
        /// </summary>
        [Description("设置提示框边框颜色")]
        public string HintBorderColor
        {
            get { return hintBorderColor; }
            set { hintBorderColor = value; }
        }

        private string hintBackColor = "FFFFE1";//提示框背景颜色
        /// <summary>
        /// 获取或设置提示框背景颜色
        /// </summary>
        [Description("设置提示框背景颜色")]
        public string HintBackColor
        {
            get { return hintBackColor; }
            set { hintBackColor = value; }
        }

        private string topImg = "";
        /// <summary>
        /// 设置提示框顶部图片
        /// </summary>
        [Description("设置提示框顶部图片")]
        public string TopImg
        {
            get { return topImg; }
            set { topImg = value; }
        }

        private string bottomImg = "";
        /// <summary>
        /// 设置提示框底部图片
        /// </summary>
        [Description("设置提示框底部图片")]
        public string BottomImg
        {
            get { return bottomImg; }
            set { bottomImg = value; }
        }

        private string hintImg = "";
        //"style/images/ydot.png";//提示图片地址
        /// <summary>
        /// 获取或设置提示框标识图片
        /// </summary>
        [Description("设置提示框标识图片")]
        public string HintImg
        {
            get { return hintImg; }
            set { hintImg = value; }
        }


        #endregion



        #endregion

        protected override void Render(HtmlTextWriter writer)
        {
            #region 第一次使用必须加载的样式和脚本
            string scriptKey = "hintJS";
            if (!Page.IsClientScriptBlockRegistered(scriptKey) && !Page.IsStartupScriptRegistered(scriptKey))
            {
                string scriptBlock = "<script type=\"text/javascript\" src=\"" + Page.ClientScript.GetWebResourceUrl(this.GetType(), "Liping.HintTextBox.script.hintJS.js") + "\" language=\"JavaScript\"></script>";

                Page.RegisterStartupScript(scriptKey, scriptBlock);

                

                writer.WriteLine("<span id=\"hintdiv\" style=\"display:none;position:absolute;z-index:500;\"></span>");
            }
            #endregion

            //文本框

            writer.RenderBeginTag(HtmlTextWriterTag.Div);
            AddAttributesToRender(writer);
            writer.AddAttribute(HtmlTextWriterAttribute.Name, this.UniqueID);
            writer.AddAttribute(HtmlTextWriterAttribute.Type, "text");
            writer.AddAttribute(HtmlTextWriterAttribute.Value, text);
            if (string.IsNullOrEmpty(topImg))
            {
                if (aspect == 1)
                {
                    topImg = Page.ClientScript.GetWebResourceUrl(this.GetType(), "Liping.HintTextBox.Image.hintuptop.gif");
                }
                else
                {
                    topImg = Page.ClientScript.GetWebResourceUrl(this.GetType(), "Liping.HintTextBox.Image.hintdowntop.gif");
                }
            }
            if (string.IsNullOrEmpty(bottomImg))
            {
                if (aspect == 1)
                {
                    bottomImg = Page.ClientScript.GetWebResourceUrl(this.GetType(), "Liping.HintTextBox.Image.hintupbottom.gif");
                }
                else
                {
                    bottomImg = Page.ClientScript.GetWebResourceUrl(this.GetType(), "Liping.HintTextBox.Image.hintdownbottom.gif");
                }
            }
            if (string.IsNullOrEmpty(hintImg))
            {
                hintImg = Page.ClientScript.GetWebResourceUrl(this.GetType(), "Liping.HintTextBox.Image.ydot.png");
            }

            writer.AddAttribute("onmouseover", "showhintinfo(this,0,0,'提示','" + hintText + "','0','" + (aspect == 1 ? "up" : "down") + "','" + topImg + "','" + bottomImg + "','" + hintImg + "')");
            writer.AddAttribute("onmouseout", "hidehintinfo()");
            writer.RenderBeginTag(HtmlTextWriterTag.Input);

            writer.RenderEndTag();
            writer.RenderEndTag();
        }

        #region IPostBackDataHandler 成员

        public bool LoadPostData(string postDataKey, System.Collections.Specialized.NameValueCollection postCollection)
        {
            text = postCollection[this.UniqueID];
            return false;
        }

        public void RaisePostDataChangedEvent()
        {

        }

        #endregion
    }
}