TextBox 控件的扩展， Help!!!

Question

扩展功能（WEB项目中）:
   1.新增下拉功能， 下拉显示的数据从数据库中读取，
    
   2.TextBox里的文本， 即可以自己输入， 也可以从下拉选择。望有经验的朋友， 给点思路， 最好有实例。
多谢！

Answer 1

呵呵,你有想法.
大部分见过的都是用Div模拟出来的效果!像google的search.

Answer 2

奇怪，为什么不用combobox来实现？那样更为方便吧？什么下拉效果和从数据库查出来的匹配项不都有地方显示了？

Answer 3

重写textbox属性和事件
参考
http://www.cnblogs.com/honliv/articles/809353.html
http://www.cnblogs.com/admin11/articles/1259577.html

Answer 4

请试用ajaxtoolkit 中的autocomplete 控件

Answer 5

        [Category("自定义信息区")]
        [DefaultValue("false"), RefreshProperties(RefreshProperties.Repaint), Description("验证控件的字体删除线"), NotifyParentProperty(true)]
        public bool ValidateFontStrikeout
        {
            get
            {                if (ViewState["ValidateFontStrikeout"] != null)
                    return (bool)ViewState["ValidateFontStrikeout"];
                return false;
            }
            set { ViewState["ValidateFontStrikeout"] = value; }
        }
        [Category("自定义信息区")]
        [DefaultValue(""), RefreshProperties(RefreshProperties.Repaint), Description("验证控件的CSSClass属性"), NotifyParentProperty(true)]
        public string ValidateCSSClass
        {
            get
            {                if (ViewState["ValidateCSSClass"] != null)
                    return ViewState["ValidateCSSClass"].ToString();
                return string.Empty;
            }
            set { ViewState["ValidateCSSClass"] = value; }
        }
        [Category("自定义信息区")]
        [DefaultValue("false"), RefreshProperties(RefreshProperties.Repaint), Description("验证控件的字体下划线"), NotifyParentProperty(true)]
        public bool ValidateFontUnderline
        {
            get
            {                if (ViewState["ValidateFontUnderline"] != null)
                    return (bool)ViewState["ValidateFontUnderline"];
                return false;
            }
            set { ViewState["ValidateFontUnderline"] = value; }
        }
        [Category("自定义信息区"), DefaultValue(""), Description("验证控件的字体名")]
        [Editor("System.Drawing.Design.FontNameEditor, System.Drawing.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a", typeof(UITypeEditor)), TypeConverter(typeof(FontConverter.FontNameConverter))]
        public string ValidateFontName
        {
            get
            {
                if (ViewState["ValidateFontName"] != null)
                    return (string)ViewState["ValidateFontName"];
                return string.Empty;
            }
            set
            {
                ViewState["ValidateFontName"] = value;
            }
        }        #endregion        #region 构造函数
        public xxxTextBox() { }
        #endregion        #region 重写子控件
        protected override void EnsureChildControls()
        {
            this.rfvDataInput.CssClass = this.CssError;
            this.rfvDataInput.ErrorMessage = "*输入不能为空";
            this.rfvDataInput.Display = System.Web.UI.WebControls.ValidatorDisplay.Dynamic;
            this.rfvDataInput.EnableViewState = true;
            this.rfvDataInput.ControlToValidate = base.ID;
            this.rfvDataInput.ForeColor = ValidateForeColor;            this.rfvDataInput.BackColor = ValidateBackColor;
            if (ValidateFontSize != null)
            {
                this.rfvDataInput.Font.Size = ValidateFontSize;
            }
           
            this.rfvDataInput.Font.Bold = ValidateFontBold;
            this.rfvDataInput.Font.Italic = ValidateFontItalic;
            this.rfvDataInput.Font.Strikeout = ValidateFontStrikeout;
            this.rfvDataInput.Font.Overline = ValidateFontOverLine;
            this.rfvDataInput.Font.Underline = ValidateFontUnderline;
            if (!string.IsNullOrEmpty(ValidateFontName))
                this.rfvDataInput.Font.Name = ValidateFontName;
            if (!string.IsNullOrEmpty(ValidateCSSClass))
                this.rfvDataInput.CssClass = ValidateCSSClass;            this.revDataInput.CssClass = this.CssError;
            this.revDataInput.ErrorMessage = "*输入格式错误";
            this.revDataInput.Display = System.Web.UI.WebControls.ValidatorDisplay.Dynamic;
            this.revDataInput.EnableViewState = true;
            this.revDataInput.ControlToValidate = base.ID;
            this.revDataInput.ForeColor = ValidateForeColor;            this.revDataInput.BackColor = ValidateBackColor;
            if (ValidateFontSize != null)
            {
                this.revDataInput.Font.Size = ValidateFontSize;
            }
            this.revDataInput.Font.Bold = ValidateFontBold;
            this.revDataInput.Font.Bold = ValidateFontBold;
            this.revDataInput.Font.Italic = ValidateFontItalic;
            this.revDataInput.Font.Strikeout = ValidateFontStrikeout;
            this.revDataInput.Font.Overline = ValidateFontOverLine;
            this.revDataInput.Font.Underline = ValidateFontUnderline;
            if (!string.IsNullOrEmpty(ValidateFontName))
                this.revDataInput.Font.Name = ValidateFontName;
            if (!string.IsNullOrEmpty(ValidateCSSClass))
                this.revDataInput.CssClass = ValidateCSSClass;            //将子控件添加到此自定义控件中
            this.Controls.Add(rfvDataInput);
            this.Controls.Add(revDataInput);
         
            this.Controls.Add(pnlFrame);
            if (this.ValidType == DataType.Date)
                this.Attributes.Add("onfocus", "WdatePicker({isShowClear:false,readOnly:true})");
        }
        #endregion

Answer 6

呵呵 楼主肯定知道combobox滴！所以……
5楼很强