可输入的下拉框(DropDownList)
2007-05-25 20:23
162 查看
1 新建ascx用户控件
<%@ Control Language="C#" AutoEventWireup="true" CodeFile="EditableSelect.ascx.cs" Inherits="EditableSelect" %>
<asp:TextBox ID="TextBox1" runat="server" ></asp:TextBox>
<span style="width:18px;border:0px solid red;">
<asp:DropDownList ID="DropDownList1" runat="server"></asp:DropDownList>
</span>
<style type="text/css">
.<%=Client%>showarrow...{margin-left:-<% =Width%>px;width:<% =(Width+18)%>px;}
.<%=Client%>textboxwidth...{width:<% =(Width)%>px;border-right-width:0px;<% =TextStyle%>}
</style>
2 代码
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class EditableSelect : System.Web.UI.UserControl
...{
private int width = 200;
private string textstyle = "";
bool enable = true;
protected void Page_Load(object sender, EventArgs e)
...{
this.DropDownList1.Attributes.Add("onchange", "var obj=this.parentElement.parentElement.getElementsByTagName('input')[0];obj.focus();obj.value=this.value;");
if (!Page.IsPostBack)
...{
if (this.DropDownList1.Items.Count > 0)
...{
this.TextBox1.Text = this.DropDownList1.SelectedValue;
}
}
this.DropDownList1.CssClass = this.Client + "showarrow";
this.TextBox1.CssClass = this.Client + "textboxwidth";
}
/**//// <summary>
/// 下拉框对象
/// </summary>
public DropDownList Select
...{
get
...{
return this.DropDownList1;
}
}
/**//// <summary>
/// 文本框对象
/// </summary>
public TextBox InputText
...{
get
...{
return this.TextBox1;
}
}
/**//// <summary>
/// 选定文本
/// </summary>
public string Text
...{
get
...{
return this.TextBox1.Text;
}
set
...{
this.TextBox1.Text = value;
}
}
public int Width
...{
get
...{
return this.width;
}
set
...{
this.width = value;
}
}
public string Client
...{
get
...{
return this.ClientID;
}
}
public string TextStyle
...{
set
...{
this.textstyle = value;
}
get
...{
return this.textstyle;
}
}
public bool Enable
...{
set
...{
enable = value;
this.TextBox1.Enabled = enable;
this.DropDownList1.Enabled = enable;
}
get
...{
return enable;
}
}
}
3 测试页
<%@ Register TagPrefix="TDL" TagName="TextDropListShow" Src="~/EditableSelect.ascx" %>
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="BooksManager.aspx.cs" Inherits="InterFace_Books_BooksManager" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>下拉框测试</title>
</head>
<body>
<form id="formBooksManager" runat="server">
<div>
<TDL:TextDropListShow ID="txtDrp" runat="server" />
</div>
</form>
</body>
</html>
相关使用：
protected void Page_Load(object sender, EventArgs e)
{
txtDrp.Select.Items.Add("One");
txtDrp.Select.Items.Add("Two");
txtDrp.Select.Items.Add("Three");
}
protected void Button1_Click(object sender, EventArgs e)
{
Label1.Text = this.txtDrp.Text;
Label1.Text = this.txtDrp.Select.SelectedValue.ToString();
}
在FireFox下可以,但是IE下不行
参考文献:http://bbs.51js.com/redirect.php?fid=22&tid=58823&goto=nextnewset
在IE下的运行可以修改代码如下：
<%@ Control Language="C#" AutoEventWireup="true" CodeFile="EditableSelect.ascx.cs" Inherits="EditableSelect" %>
<asp:TextBox ID="TextBox1" runat="server" ></asp:TextBox>
<span style="width:18px;border:0px solid red; position:relative; "><asp:DropDownList ID="DropDownList1" runat="server"></asp:DropDownList></span>
<style type="text/css">
.<%=Client%>textboxwidth{width:<% =(Width)%>px;border-right-width:0px;<% =TextStyle%>}
.<%=Client%>showarrow{margin-left:-<% =Width%>px;width:<% =(Width+18)%>px;}
</style>
运行结果:
测试通过！
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