如何在asp.net中对listBox 用 optgroup 分组
如何在asp.net中对listBox 用 optgroup 分组分多个组 --------------------编程问答-------------------- 友情up一下。。。 --------------------编程问答-------------------- .net的listbox貌似没有分组功能,可以试试重写一个optgroup功能 --------------------编程问答-------------------- 没有这功能.得重写..
给你一个dropdownlist重写的例子,应该类似:
--------------------编程问答--------------------
using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Web.UI.WebControls;
using System.Web.UI;
using System.Web;
namespace YYControls
{
/// <summary>
/// SmartDropDownList类的属性部分
/// </summary>
public partial class SmartDropDownList
{
/// <summary>
/// 呈现Option或OptionGroup
/// </summary>
/// <param name="writer">writer</param>
private void OptionGroupRenderContents(HtmlTextWriter writer)
{
// 是否需要呈现OptionGroup的EndTag
bool writerEndTag = false;
foreach (ListItem li in this.Items)
{
// 如果没有optgroup属性则呈现Option
if (li.Value != this.OptionGroupValue)
{
// 呈现Option
RenderListItem(li, writer);
}
// 如果有optgroup属性则呈现OptionGroup
else
{
if (writerEndTag)
// 呈现OptionGroup的EndTag
OptionGroupEndTag(writer);
else
writerEndTag = true;
// 呈现OptionGroup的BeginTag
OptionGroupBeginTag(li, writer);
}
}
if (writerEndTag)
// 呈现OptionGroup的EndTag
OptionGroupEndTag(writer);
}
/// <summary>
/// 呈现OptionGroup的BeginTag
/// </summary>
/// <param name="li">OptionGroup数据项</param>
/// <param name="writer">writer</param>
private void OptionGroupBeginTag(ListItem li, HtmlTextWriter writer)
{
writer.WriteBeginTag("optgroup");
// 写入OptionGroup的label
writer.WriteAttribute("label", li.Text);
foreach (string key in li.Attributes.Keys)
{
// 写入OptionGroup的其它属性
writer.WriteAttribute(key, li.Attributes[key]);
}
writer.Write(HtmlTextWriter.TagRightChar);
writer.WriteLine();
}
/// <summary>
/// 呈现OptionGroup的EndTag
/// </summary>
/// <param name="writer">writer</param>
private void OptionGroupEndTag(HtmlTextWriter writer)
{
writer.WriteEndTag("optgroup");
writer.WriteLine();
}
/// <summary>
/// 呈现Option
/// </summary>
/// <param name="li">Option数据项</param>
/// <param name="writer">writer</param>
private void RenderListItem(ListItem li, HtmlTextWriter writer)
{
writer.WriteBeginTag("option");
// 写入Option的Value
writer.WriteAttribute("value", li.Value, true);
if (li.Selected)
{
// 如果该Option被选中则写入selected
writer.WriteAttribute("selected", "selected", false);
}
foreach (string key in li.Attributes.Keys)
{
// 写入Option的其它属性
writer.WriteAttribute(key, li.Attributes[key]);
}
writer.Write(HtmlTextWriter.TagRightChar);
// 写入Option的Text
HttpUtility.HtmlEncode(li.Text, writer);
writer.WriteEndTag("option");
writer.WriteLine();
}
}
}
--------------------编程问答--------------------
using System;
using System.Collections.Generic;
using System.Text;
using System.ComponentModel;
using System.Web.UI;
namespace YYControls
{
/// <summary>
/// SmartDropDownList类的属性部分
/// </summary>
public partial class SmartDropDownList
{
/// <summary>
/// 用于添加SmartDropDownList的分组项的ListItem的Value值
/// </summary>
[
Browsable(true),
Description("用于添加DropDownList的分组项的ListItem的Value值"),
Category("扩展")
]
public virtual string OptionGroupValue
{
get
{
string s = (string)ViewState["OptionGroupValue"];
return (s == null) ? "optgroup" : s;
}
set
{
ViewState["OptionGroupValue"] = value;
}
}
}
}
--------------------编程问答-------------------- listbox的,代码如下: --------------------编程问答--------------------
using System;
using System.Collections.Generic;
using System.Text;
using System.Web.UI.WebControls;
using System.Web.UI;
[assembly: System.Web.UI.WebResource("YYControls.SmartDropDownList.Resources.Icon.bmp", "image/bmp")]
namespace YYControls
{
/// <summary>
/// SmartDropDownList类，继承自DropDownList
/// </summary>
[ToolboxData(@"<{0}:SmartDropDownList runat='server'></{0}:SmartDropDownList>")]
[System.Drawing.ToolboxBitmap(typeof(YYControls.Resources.Icon), "SmartDropDownList.bmp")]
public partial class SmartDropDownList : DropDownList
{
/// <summary>
/// 构造函数
/// </summary>
public SmartDropDownList()
{
}
/// <summary>
/// 将控件的内容呈现到指定的编写器中
/// </summary>
/// <param name="writer">writer</param>
protected override void RenderContents(HtmlTextWriter writer)
{
// 呈现Option或OptionGroup
OptionGroupRenderContents(writer);
}
}
}
--------------------编程问答--------------------
using System;
using System.Collections.Generic;
using System.Text;
using System.Web.UI.WebControls;
using System.Web.UI;
[assembly: System.Web.UI.WebResource("YYControls.SmartListBox.Resources.Icon.bmp", "image/bmp")]
namespace YYControls
{
/// <summary>
/// SmartListBox类，继承自ListBox
/// </summary>
[ToolboxData(@"<{0}:SmartListBox runat='server'></{0}:SmartListBox>")]
[System.Drawing.ToolboxBitmap(typeof(YYControls.Resources.Icon), "SmartListBox.bmp")]
public partial class SmartListBox : ListBox
{
/// <summary>
/// 构造函数
/// </summary>
public SmartListBox()
{
}
/// <summary>
/// 将控件的内容呈现到指定的编写器中
/// </summary>
/// <param name="writer">writer</param>
protected override void RenderContents(HtmlTextWriter writer)
{
// 呈现Option或OptionGroup
OptionGroupRenderContents(writer);
}
}
}
--------------------编程问答--------------------
using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Web.UI.WebControls;
using System.Web.UI;
using System.Web;
namespace YYControls
{
/// <summary>
/// SmartListBox类的属性部分
/// </summary>
public partial class SmartListBox
{
/// <summary>
/// 呈现Option或OptionGroup
/// </summary>
/// <param name="writer">writer</param>
private void OptionGroupRenderContents(HtmlTextWriter writer)
{
// 是否需要呈现OptionGroup的EndTag
bool writerEndTag = false;
foreach (ListItem li in this.Items)
{
// 如果没有optgroup属性则呈现Option
if (li.Value != this.OptionGroupValue)
{
// 呈现Option
RenderListItem(li, writer);
}
// 如果有optgroup属性则呈现OptionGroup
else
{
if (writerEndTag)
// 呈现OptionGroup的EndTag
OptionGroupEndTag(writer);
else
writerEndTag = true;
// 呈现OptionGroup的BeginTag
OptionGroupBeginTag(li, writer);
}
}
if (writerEndTag)
// 呈现OptionGroup的EndTag
OptionGroupEndTag(writer);
}
/// <summary>
/// 呈现OptionGroup的BeginTag
/// </summary>
/// <param name="li">OptionGroup数据项</param>
/// <param name="writer">writer</param>
private void OptionGroupBeginTag(ListItem li, HtmlTextWriter writer)
{
writer.WriteBeginTag("optgroup");
// 写入OptionGroup的label
writer.WriteAttribute("label", li.Text);
foreach (string key in li.Attributes.Keys)
{
// 写入OptionGroup的其它属性
writer.WriteAttribute(key, li.Attributes[key]);
}
writer.Write(HtmlTextWriter.TagRightChar);
writer.WriteLine();
}
/// <summary>
/// 呈现OptionGroup的EndTag
/// </summary>
/// <param name="writer">writer</param>
private void OptionGroupEndTag(HtmlTextWriter writer)
{
writer.WriteEndTag("optgroup");
writer.WriteLine();
}
/// <summary>
/// 呈现Option
/// </summary>
/// <param name="li">Option数据项</param>
/// <param name="writer">writer</param>
private void RenderListItem(ListItem li, HtmlTextWriter writer)
{
writer.WriteBeginTag("option");
// 写入Option的Value
writer.WriteAttribute("value", li.Value, true);
if (li.Selected)
{
// 如果该Option被选中则写入selected
writer.WriteAttribute("selected", "selected", false);
}
foreach (string key in li.Attributes.Keys)
{
// 写入Option的其它属性
writer.WriteAttribute(key, li.Attributes[key]);
}
writer.Write(HtmlTextWriter.TagRightChar);
// 写入Option的Text
HttpUtility.HtmlEncode(li.Text, writer);
writer.WriteEndTag("option");
writer.WriteLine();
}
}
}
--------------------编程问答-------------------- http://www.cnblogs.com/webabcd/archive/2008/01/03/1024977.html --------------------编程问答-------------------- 用HTML 输出..
using System;
using System.Collections.Generic;
using System.Text;
using System.ComponentModel;
using System.Web.UI;
namespace YYControls
{
/// <summary>
/// SmartListBox类的属性部分
/// </summary>
public partial class SmartListBox
{
/// <summary>
/// 用于添加SmartListBox的分组项的ListItem的Value值
/// </summary>
[
Browsable(true),
Description("用于添加ListBox的分组项的ListItem的Value值"),
Category("扩展")
]
public virtual string OptionGroupValue
{
get
{
string s = (string)ViewState["OptionGroupValue"];
return (s == null) ? "optgroup" : s;
}
set
{
ViewState["OptionGroupValue"] = value;
}
}
}
}
#region HTML输出
string sql = "select * from Dictionaries where type=5 and ParentID=0";//父级类别
DataTable 类别 = SQLHelper.ExecuteDataTable(CommandType.Text, sql, new DataSet(), "s", null);
L类别.Text += "<select id=select name='filter' onchange=quzhi(); > ";
L类别.Text += "<option value='0'>请选择</option> ";
foreach (DataRow row in 类别.Rows)
{
sql = "select * from Dictionaries where ParentID=" + row[0].ToString();//子集类别
DataTable 子项 = SQLHelper.ExecuteDataTable(CommandType.Text, sql, new DataSet(), "s", null);
if (子项.Rows.Count > 0)//存在子集就添加子集
{
L类别.Text += " <optgroup label='--------------------- '> </optgroup> ";
L类别.Text += " <optgroup label=" + row[1].ToString() + "> ";
foreach (DataRow item in 子项.Rows)
{
L类别.Text += " <option value=" + item[0].ToString() + " >" + item[1].ToString() + "</option> ";
}
L类别.Text += " </optgroup> ";
L类别.Text += " <optgroup label=' '> </optgroup> ";
}
else
{
L类别.Text += " <option value=" + row[0].ToString() + ">" + row[1].ToString() + "</option> ";
}
}
L类别.Text += "</select> ";
#endregion
用JS获取选中的值 赋值给隐藏域
$("#hide").val($("#select").val());
--------------------编程问答-------------------- 用扩展控件SmartDropDownList
http://www.cnblogs.com/webabcd/archive/2008/01/03/1024977.html
http://www.cnblogs.com/chenying99/archive/2012/02/23/2365448.html
补充：.NET技术 , ASP.NET
