自定义服务器控件开发之4：重写的支持多验证TextBox控件 续1

        去年写了这个东东，发现还是挺好用的，哈哈！不过感觉功能不太满意，于是有增加了些新的功能。
        1、增加了输入提示、自定义错误提示、自定义不能为空的提示；
        2、增加输入框处于焦点时的样式变化；
        3、增加了可自增加行数和减少行数功能；
        4、增加了下拉框模式，下拉框可进行数据源的绑定；


由于字符数过多，不能完全粘贴，需要的朋友请下载附件。
https://files.cnblogs.com/nowind/WebTextBox.rar
增加部分源代码如下：

  1//可调整高度
  2            if (this.IsRegulateHeight)
  3            {
  4                #region
  5                StringBuilder sbscript = new StringBuilder();
  6                sbscript.Append("\n<!--调节输入框高度 begin-->\n");
  7                sbscript.Append("    <script type=\"text/javascript\">\n");
  8                sbscript.Append("        //Plus\n");
  9                sbscript.Append("        function PlusHeight(id)\n");
 10                sbscript.Append("        {\n");
 11                sbscript.Append("            var txtInput = document.getElementById(id);\n");
 12                sbscript.Append("                txtInput.rows = parseInt(txtInput.rows) + " + this.RegulateRows + ";\n");
 13                //sbscript.Append("            txtInput.style.height = txtInput.style.height+15;\n");
 14                sbscript.Append("        }\n");
 15                sbscript.Append("        //Minus\n");
 16                sbscript.Append("        function MinusHeight(id)\n");
 17                sbscript.Append("        {\n");
 18                sbscript.Append("            var txtInput = document.getElementById(id);\n");
 19                sbscript.Append("            if( parseInt(txtInput.rows) >= " + (this.RegulateRows + 1) + " )\n");
 20                sbscript.Append("                txtInput.rows = parseInt(txtInput.rows) - " + this.RegulateRows + ";\n");
 21                sbscript.Append("        }\n");
 22                sbscript.Append("    </script>\n");
 23                sbscript.Append("<!--调节输入框高度 end-->\n");
 24
 25                System.Web.UI.ClientScriptManager client = this.Page.ClientScript;
 26                Type cstype = Page.GetType();
 27                if (!client.IsStartupScriptRegistered(cstype, "regulateheight"))
 28                    client.RegisterStartupScript(cstype, "regulateheight", sbscript.ToString());
 29
 30                StringBuilder sbhtml = new StringBuilder();
 31                sbhtml.Append("<div style=\"height:24px;\">");
 32                sbhtml.Append("    " + this.ImageIconMinus + "&nbsp;&nbsp;" + this.ImageIconPlus);
 33                sbhtml.Append("</div>");
 34                output.Write(sbhtml.ToString());
 35                #endregion
 36            }
 37            //下拉框模式
 38            if (this.HasDropDownList)
 39            {
 40                #region
 41                //已经改为点击输入框的时候激发客户端事件
 42                //output.Write("<img id=\"" + this.ClientID + "Icon\" src=\"" + this.ImageIconShowDropDown + "\" border=\"0\" style=\"cursor:hand;\" onclick=\"ShowList('" + this.ClientID + "');\" align=\"absmiddle\" />\n");
 43                int width = Convert.ToInt32(base.Width.Value);
 44                width = width == 0 ? 100 : width;
 45                output.AddAttribute(System.Web.UI.HtmlTextWriterAttribute.Style, "display:none;position:absolute;");
 46                output.AddAttribute(System.Web.UI.HtmlTextWriterAttribute.Id, this.ClientID + "List");
 47                output.RenderBeginTag(HtmlTextWriterTag.Div);
 48                output.AddAttribute(System.Web.UI.HtmlTextWriterAttribute.Style, "margin-left:" + width + "px;");
 49                output.RenderBeginTag(HtmlTextWriterTag.Span);
 50
 51                drpList.ID = base.ID+"Items";
 52                drpList.Style.Add("margin-left", "-" + width + "px");
 53                drpList.Attributes.Add("onchange", "document.getElementById('" + this.ClientID + "').value=this.options[this.selectedIndex].text;document.getElementById('" + this.ClientID + "List').style.display='none';");
 54                //drpList.Attributes.Add("onblur", "this.style.display='none'");
 55                if (this.DropDownListDataSource !=null && this.DropDownListDataSource.Rows.Count > 0) 
 56                {
 57                    drpList.DataTextField = this.DataTextField;
 58                    drpList.DataValueField = this.DataValueField;
 59                    drpList.DataSource = this.DropDownListDataSource.DefaultView;
 60                    drpList.DataBind();
 61                }
 62                if(HasDefaultItem)
 63                    drpList.Items.Insert(0,new ListItem(this.DefaultItemText,this.DefaultItemValue));
 64                foreach (ListItem item in drpList.Items)
 65                {
 66                    if (item.Text == base.Text.Trim())
 67                    {
 68                        item.Selected = true;
 69                        break;
 70                    }
 71                }
 72                this.drpList.RenderControl(output);
 73                output.RenderEndTag();
 74                output.RenderEndTag();
 75
 76                StringBuilder sbscript = new StringBuilder();
 77                js内容#region js内容
 78                sbscript.Append("\n<script type=\"text/javascript\">\n");
 79                sbscript.Append("    <!--下拉框显示隐藏 begin-->\n");
 80                sbscript.Append("    function ShowList(id)\n");
 81                sbscript.Append("    {\n");
 82                sbscript.Append("        var txtInput = document.getElementById(id);\n");
 83                sbscript.Append("        var drpList = document.getElementById(id+'List');\n");
 84                //sbscript.Append("        var drpIcon = document.getElementById(id+'Icon');\n");
 85                sbscript.Append("        var drpItems = document.getElementById(id+'Items');\n");    //下拉框
 86                sbscript.Append("        if(drpList.style.display == 'block')\n");
 87                sbscript.Append("        {\n");
 88                sbscript.Append("            txtInput.title = '点击显示下拉框';\n");
 89                sbscript.Append("            drpList.style.display = 'none';\n");
 90                //sbscript.Append("            drpIcon.src = '" + this.ImageIconShowDropDown + "';\n");
 91                sbscript.Append("        }\n");
 92                sbscript.Append("        else\n");
 93                sbscript.Append("        {\n");
 94                sbscript.Append("            txtInput.title = '点击关闭下拉框';\n");
 95                sbscript.Append("            drpList.style.display = 'block';\n");
 96                sbscript.Append("            drpList.style.left = GetOffsetLeft(txtInput)+'px';\n");
 97                sbscript.Append("            drpList.style.top = (GetOffsetTop(txtInput)+1)+'px';\n");
 98                sbscript.Append("            drpItems.style.width = txtInput.offsetWidth+'px';\n");
 99                //sbscript.Append("            drpIcon.src = '" + this.ImageIconHideDropDown + "';\n");
100                sbscript.Append("        }\n");
101                sbscript.Append("    }\n");
102                sbscript.Append("    <!--下拉框显示隐藏 end-->\n");
103                sbscript.Append("    function GetOffsetTop(e) \n");
104                sbscript.Append("    {\n");
105                sbscript.Append("        var offsetTop = e.offsetTop;\n");
106                sbscript.Append("        var offsetParent = e.offsetParent;\n");
107                sbscript.Append("        while(offsetParent)\n");
108                sbscript.Append("        {\n");
109                sbscript.Append("            offsetTop += offsetParent.offsetTop;\n");
110                sbscript.Append("            offsetParent = offsetParent.offsetParent;\n");
111                sbscript.Append("        }\n");
112                sbscript.Append("        return offsetTop+e.offsetHeight;\n");
113                sbscript.Append("    }\n");
114                sbscript.Append("    function GetOffsetLeft(e) \n");
115                sbscript.Append("    {\n");
116                sbscript.Append("        var offsetLeft = e.offsetLeft;\n");
117                sbscript.Append("        var offsetParent = e.offsetParent;\n");
118                sbscript.Append("        while(offsetParent) \n");
119                sbscript.Append("        {\n");
120                sbscript.Append("            offsetLeft += offsetParent.offsetLeft;\n");
121                sbscript.Append("            offsetParent = offsetParent.offsetParent;\n");
122                sbscript.Append("        }\n");
123                sbscript.Append("        return offsetLeft;\n");
124                sbscript.Append("    }\n");
125                sbscript.Append("</script>\n");
126                # endregion
127                System.Web.UI.ClientScriptManager client = this.Page.ClientScript;
128                Type cstype = Page.GetType();
129                if (!client.IsStartupScriptRegistered(cstype, "showlist"))
130                    client.RegisterStartupScript(cstype, "showlist", sbscript.ToString());
131
132                #endregion
133            }
134