SelectedIndexChanged Event Doesn't Fire

Nov 2, 2010

I have added the AutoPostBack = "true" attribute to the drop down list. It doesn't work.

<asp:DropDownList CssClass="dropDownList" ID="ddlBusinessUnit"
AutoPostBack="true" runat="server" Width="250px"
OnSelectedIndexChanged="ddlBusinessUnit_SelectedIndexChanged">
</asp:DropDownList>

code behind:

Protected Sub ddlBusinessUnit_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs)
Response.Write("Hello")
End

How can I ensure that the event method is called?

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I create a dropDownList in code-behind, in selectIndexChange of another dropDownList, and add this new dropDownList to page using a placerHolder, everthing its ok, but new dropdownlist selectIndexChange event dont fire!

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Edit:
Menu.cs
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Security.Permissions;
using System.Collections;
using System.ComponentModel.Design;
using System.Drawing.Design;
using System.Web.UI.HtmlControls;
using System.IO;
namespace MenuServerControl
{
[AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Minimal)]
[AspNetHostingPermission(SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)]
[DefaultProperty("MenuItems")]
[ParseChildren(true, "MenuItems")]
[ToolboxData("<{0}:Menu runat="server"> </{0}:Menu>")]
public class Menu : WebControl
{
#region Fields
private List<MenuItem> _MenuItems;
string _Direction
{
get
{
string direction = "";
switch (this.Direction)
{
case Directions.LeftToRight:
direction = "direction:ltr;";
break;
case Directions.RightToLeft:
direction = "direction:rtl;";
break;
default:
direction = "direction:rtl;";
break;
}
return direction;
}
}
string _AnimationDelay
{
get
{
if (AnimationDelay == null)
AnimationDelay = 1000;
return AnimationDelay.ToString().ToLower();
}
}
string _AnimationType
{
get
{
switch (this.AnimationType)
{
case AnimationType.Opacity_Height:
return "animation:{opacity:'show',height:'show'}";
case AnimationType.Opacity_Width:
return "animation:{opacity:'show',width:'show'}";
case AnimationType.Opacity:
return "animation:{opacity:'show'}";
case AnimationType.Height:
return "animation:{height:'show'}";
case AnimationType.Width:
return "animation:{width:'show'}";
case AnimationType.Height_Toggle:
return "animation: {height: 'toggle'}";
case AnimationType.Width_Toggle:
return "animation: {width: 'toggle'}";
default:
return "animation:{opacity:'show',height:'show'}";
}
}
}
string _AnimationSpeed
{
get
{
switch (this.AnimationSpeed)
{
case AnimationSpeed.Fast:
return "speed:'fast'";
case AnimationSpeed.Normal:
return "speed:'normal'";
case AnimationSpeed.Slow:
return "speed:'slow'";
default:
return "speed:'fast'";
}
}
}
string FloatStyle
{
get
{
if (Direction == Directions.RightToLeft)
return "float:right;";
else return "";
}
}
string _Main_ul_CssClass = "";
#endregion
#region Properties
public string Main_ul_CssClass
{
get
{
if (string.IsNullOrEmpty(_Main_ul_CssClass)) return "";
_Main_ul_CssClass = "class=" + _Main_ul_CssClass;
return _Main_ul_CssClass;
}
set
{
_Main_ul_CssClass = value.Trim();
}
}
public Directions Direction { get; set; }
public int? AnimationDelay { get; set; }
public AnimationType AnimationType { get; set; }
public AnimationSpeed AnimationSpeed { get; set; }
public bool DropShadow { get; set; }
public bool AutoArrows { get; set; }
[Category("Behavior")]
[Description("The menu collection")]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
[PersistenceMode(PersistenceMode.InnerDefaultProperty)]
public List<MenuItem> MenuItems
{
get
{
if (_MenuItems == null)
_MenuItems = new List<MenuItem>();
return _MenuItems;
}
}
public VerOrHor VerticalOrHorizontal { get; set; }
#endregion
#region Methods
public Menu()
{
DropShadow = true;
AutoArrows = true;
}
public override void RenderBeginTag(HtmlTextWriter writer)
{
writer.Write("<div id="" + this.ID + "" style="" + _Direction + " " + FloatStyle + "">");
}
public override void RenderEndTag(HtmlTextWriter writer)
{
writer.Write("</div>");
}
protected override void OnPreRender(EventArgs e)
{
base.OnPreRender(e);
#region Adding Script & link Tags
HtmlGenericControl jquery = new HtmlGenericControl("script");
jquery.Attributes.Add("type", "text/javascript");
jquery.Attributes.Add("src", Page.ClientScript.GetWebResourceUrl(typeof(MenuServerControl.Menu), "MenuServerControl.JavaScriptFiles.jquery_1_4_3.js"));
jquery.EnableViewState = false;
Page.Header.Controls.Add(jquery);
HtmlGenericControl hoverIntent = new HtmlGenericControl("script");
hoverIntent.Attributes.Add("type", "text/javascript");
hoverIntent.Attributes.Add("src", Page.ClientScript.GetWebResourceUrl(typeof(Menu), "MenuServerControl.JavaScriptFiles.hoverIntent.js"));
hoverIntent.EnableViewState = false;
Page.Header.Controls.Add(hoverIntent);
HtmlGenericControl jquery_bgiframe_min = new HtmlGenericControl("script");
jquery_bgiframe_min.Attributes.Add("type", "text/javascript");
jquery_bgiframe_min.Attributes.Add("src", Page.ClientScript.GetWebResourceUrl(typeof(Menu), "MenuServerControl.JavaScriptFiles.jquery_bgiframe_min.js"));
jquery_bgiframe_min.EnableViewState = false;
Page.Header.Controls.Add(jquery_bgiframe_min);
HtmlGenericControl superfish = new HtmlGenericControl("script");
superfish.Attributes.Add("type", "text/javascript");
superfish.Attributes.Add("src", Page.ClientScript.GetWebResourceUrl(typeof(Menu), "MenuServerControl.JavaScriptFiles.superfish.js"));
superfish.EnableViewState = false;
Page.Header.Controls.Add(superfish);
HtmlGenericControl supersubs = new HtmlGenericControl("script");
supersubs.Attributes.Add("type", "text/javascript");
supersubs.Attributes.Add("src", Page.ClientScript.GetWebResourceUrl(typeof(Menu), "MenuServerControl.JavaScriptFiles.supersubs.js"));
supersubs.EnableViewState = false;
Page.Header.Controls.Add(supersubs);
if (Direction == Directions.LeftToRight)
{
HtmlGenericControl csslink = new HtmlGenericControl("link");
csslink.Attributes.Add("href", Page.ClientScript.GetWebResourceUrl
(typeof(Menu), "MenuServerControl.CSS.superfish.css"));
csslink.ID = "NavigationMenu";
csslink.Attributes.Add("type", "text/css");
csslink.Attributes.Add("rel", "stylesheet");
csslink.EnableViewState = false;
Page.Header.Controls.Add(csslink);
}
else
{
HtmlGenericControl csslink = new HtmlGenericControl("link");
csslink.Attributes.Add("href", Page.ClientScript.GetWebResourceUrl
(typeof(Menu), "MenuServerControl.CSS.RightToLeft superfish.css"));
csslink.ID = "NavigationMenu";
csslink.Attributes.Add("type", "text/css");
csslink.Attributes.Add("rel", "stylesheet");
csslink.EnableViewState = false;
Page.Header.Controls.Add(csslink);
}
if (this.VerticalOrHorizontal == VerOrHor.Vertical && this.Direction == Directions.RightToLeft)
{
HtmlGenericControl csslink01 = new HtmlGenericControl("link");
csslink01.Attributes.Add("href", Page.ClientScript.GetWebResourceUrl
(typeof(Menu), "MenuServerControl.CSS.RightToLeft superfish-vertical.css"));
csslink01.Attributes.Add("type", "text/css");
csslink01.Attributes.Add("rel", "stylesheet");
csslink01.EnableViewState = false;
Page.Header.Controls.Add(csslink01);
}
else if (this.VerticalOrHorizontal == VerOrHor.Vertical)
{
HtmlGenericControl csslink01 = new HtmlGenericControl("link");
csslink01.Attributes.Add("href", Page.ClientScript.GetWebResourceUrl
(typeof(Menu), "MenuServerControl.CSS.superfish-vertical.css"));
csslink01.Attributes.Add("type", "text/css");
csslink01.Attributes.Add("rel", "stylesheet");
csslink01.EnableViewState = false;
Page.Header.Controls.Add(csslink01);
}
#endregion
}
protected override void RenderContents(HtmlTextWriter output)
{
output.Write(CreateMenuHtmlTags());
}
StringBuilder CreateMenuHtmlTags()
{
if (this._MenuItems == null)
throw new Exception("تگ های مربوط به منو را کامل کنید");
StringBuilder Html = new StringBuilder("");
#region Add <Script>
if (String.IsNullOrEmpty(Main_ul_CssClass))
Html.Append("<script>$(document).ready(function() { $("ul.sf-menu").superfish({pathLevels: 1,");
else
Html.Append("<script>$(document).ready(function() { $("ul." + Main_ul_CssClass + "").superfish({ pathLevels: 1,");
Html.Append("delay:" + _AnimationDelay + ",");
Html.Append(_AnimationType + ",");
Html.Append(_AnimationSpeed + ",");
Html.Append("dropShadows: " + DropShadow.ToString().ToLower() + ",");
Html.Append(@"autoArrows: " + AutoArrows.ToString().ToLower() + "});});</script>");
#endregion
if (string.IsNullOrEmpty(Main_ul_CssClass) && VerticalOrHorizontal == VerOrHor.Vertical)
Html.Append("<ul class="sf-menu sf-vertical sf-js-enabled sf-shadow" id='sample-menu-1'>");
else if (String.IsNullOrEmpty(Main_ul_CssClass))
Html.Append("<ul class="sf-menu sf-js-enabled sf-shadow" id='sample-menu-1'>");
else
Html.Append("<ul class="" + Main_ul_CssClass + "" id='sample-menu-1'>");
foreach (MenuItem item in _MenuItems)
{
if (item == null) continue;
if (item.SubMenuItems != null && item.SubMenuItems.Count > 0)
{
Html.Append("<li" + item.li_CssClass + ">");
Html.Append("<a href="" + item.Href + "">" + item.Text.Trim() + "</a>");
ParseSubMenuItems(ref Html, item);
Html.Append("</li>");
}
else if (item.SubMenuItems != null)
Html.Append("<li" + item.li_CssClass + "><a href="" + item.Href + "">" + item.Text.Trim() + "</a></li>");
}
Html.Append("</ul>");
return Html;
}
void ParseSubMenuItems(ref StringBuilder Html, MenuItem menuItems)
{
if (menuItems == null) return;
Html.Append("<ul " + menuItems.ul_CssClass + " style="display: none; visibility: hidden;">");
foreach (var item in menuItems.SubMenuItems)
{
if (item == null) continue;
MenuItem Sub_MenuItem = item as MenuItem;
WebControl webControl = item as WebControl;
if (Sub_MenuItem != null)
{
if (Sub_MenuItem.SubMenuItems != null && Sub_MenuItem.SubMenuItems.Count > 0)
{
Html.Append("<li" + Sub_MenuItem.li_CssClass + ">");
Html.Append("<a href="" + Sub_MenuItem.Href + "">" + Sub_MenuItem.Text.Trim() + "</a>");
ParseSubMenuItems(ref Html, Sub_MenuItem);
Html.Append("</li>");
}
else if (Sub_MenuItem.SubMenuItems != null)
Html.Append("<li" + Sub_MenuItem.li_CssClass + "><a href="" + Sub_MenuItem.Href + "">" + Sub_MenuItem.Text.Trim() + "</a></li>");
}
else if (webControl != null)
{
Html.Append("<li>");
webControl.EnableViewState = true;
this.Controls.Add(webControl);
webControl.EnableViewState = true;
StringBuilder sb = new StringBuilder();
sb.Append("<div>");
using (StringWriter sw = new StringWriter(sb))
{
using (HtmlTextWriter textWriter = new HtmlTextWriter(sw))
{
webControl.RenderControl(textWriter);
}
}
sb.Append("</div>");
Html.Append(sb.ToString());
Html.Append("</li>");
}
}
Html.Append("</ul>");
}
#endregion
}
}
MenuItem.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ComponentModel;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Collections;
namespace MenuServerControl
{
[DefaultProperty("SubMenuItems")]
[ParseChildren(true, "SubMenuItems")]
[TypeConverter(typeof(ExpandableObjectConverter))]
public class MenuItem : INamingContainer
{
#region Fields
ArrayList _SubMenuItems;
string text = "";
string href = "#";
string _ul_CssClass = "";
string _li_CssClass = "";
#endregion
#region Properties
[Description("متن منو آیتم")]
[DefaultValue("")]
[NotifyParentProperty(true)]
public string Text
{
get
{
return text;
}
set
{
text = value;
}
}
[DefaultValue("#")]
[Description("<a /> href attribute")]
[NotifyParentProperty(true)]
public string Href
{
get
{
return href;
}
set
{
href = value;
}
}
[DefaultValue("")]
[Description("<ul /> css class")]
[NotifyParentProperty(true)]
public string ul_CssClass
{
get
{
if (string.IsNullOrEmpty(_ul_CssClass)) return "";
_ul_CssClass = " class="" + _ul_CssClass + """;
return _ul_CssClass;
}
set { this._ul_CssClass = value.Trim(); }
}
[DefaultValue("")]
[Description("<li /> css class")]
[NotifyParentProperty(true)]
public string li_CssClass
{
get
{
if (string.IsNullOrEmpty(_li_CssClass)) return "";
_li_CssClass = " class="" + _li_CssClass + """;
return _li_CssClass;
}
set { this._li_CssClass = value.Trim(); }
}
[Category("Behavior")]
[Description("The MenuItems collection")]
[DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
[PersistenceMode(PersistenceMode.InnerDefaultProperty)]
public ArrayList SubMenuItems
{
get
{
if (_SubMenuItems == null)
_SubMenuItems = new ArrayList();
return _SubMenuItems;
}
}
#endregion
}
}

You can download the project from here.

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Web Forms :: TextBox Doesn't Fire TextChanged Event On IE 8

Jun 9, 2010

TextBox doesn't fire TextChanged Event on IE 8, AutoPostback is true

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AJAX :: ReorderList Doesn't Fire Update Event?

Jan 12, 2011

I have my ReorderList setup, and it seems to work. It doesn't give me any errors, and it allows drag/drop of the entries.

BUT, it never updates my datasource. I have tried putting breakpoints on the update events, both on the reorder list, but also on the datasource, none fires.

What could i possibly do wrong, to achieve this?

Here's my code, just in case:

[Code]....

[Code]....

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C# - ItemCommand Event Doesn't Fire With The Repeater Control?

Feb 21, 2011

I am building a website whereby people, before checking out of the shopping cart (and transferring to the payment iframe) can select which items from the shopping cart list to delete. The results from the shopping card are listed in a Repeater control. There is a Button in the Repeater which deletes a record from the database (used LINQ to SQL to do that.)

THe problem is that the ItemCommand event doesn't fire when i click the button. I tried 'response.write(test)' and it still would not work. It is as if the repeater cannot interact with the commands. It does render the results tho.

Here's the code:

[Code]....

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C# - ItemCommand Event Doesn't Fire With Repeater Control

Feb 22, 2011

I am building a website whereby people, before checking out of the shopping cart (and transferring to the payment iframe) can select which items from the shopping cart list to delete. The results from the shopping card are listed in a Repeater control. There is a Button in the Repeater which deletes a record from the database (used LINQ to SQL to do that.)

The problem is that the ItemCommand event doesn't fire when i click the button. I tried response.write(test) and it still would not work.

It is as if the repeater cannot interact with the commands. It does render the results though.

[Code]....

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