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  • DropDownList doesn't postback on SelectedIndexChanged

    - by Sergey Volegov
    I'm writing an ASP.Net webform with some DropDownList controls on it. Then user changes selected item in one of dropdowns, ASP.Net doesn't seem to handle SelectedIndexChanged event until form is submitted with a 'Submit' button click. How do I make my dropdowns handle SelectedIndexChanged instantly? P.S. It's a classic question I have answered too many times, but it seems no one asked it before on stackoverflow.

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  • control.focus() after selectedIndexChanged

    - by kyle
    I need to focus on a textbox after an item has been selected from a dropdownlist. I've tried control.focus() and setfocus(). The last thing I've tried was Set_Focus(dtbEffectiveDate.ClientID) inside the SelectedIndexChanged method with the folowing method. Protected Sub Set_Focus(ByVal ControlName As String) Dim strScript As String strScript = "<script language=javascript> window.setTimeout(""" + ControlName + ".focus();"",0); </script>" RegisterStartupScript("focus", strScript) End Sub I'm out of answers so any help would be awesome.

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  • Gridview empty when SelectedIndexChanged called

    - by xan
    I have a DataGrid which is being bound dynamically to a database query. The user enters some search text into a text field, clicks search, and the code behind creates the appropriate database query using LINQ (searches a table based on the string and returns a limited set of the columns). It then sets the GridView datasource to be the query and calls DataBind(). protected void btnSearch_Click(object sender, EventArgs e) { var query = from record in DB.Table where record.Name.Contains(txtSearch.Text) //Extra string checking etc. removed. select new { record.ID, record.Name, record.Date }; gvResults.DataSource = query; gvResults.DataBind(); } This works fine. When a user selects a row in the grid, the SelectedIndexChanged event handler gets the id from the row in the grid (one of the fields), queries the full record from the DB and then populates a set of editor / details fields with the records full details. protected void gvResults_SelectedIndexChanged(object sender, EventArgs e) { int id = int.Parse(gvResults.SelectedRow.Cells[1].Text); DisplayDetails(id); } This works fine on my local machine where I'm developing the code. On the production server however, the function is called successfully, but the row and column count on gvResults, the GridVeiw is 0 - the table is empty. The GridView's viewstate is enabled and I can't see obvious differences. Have I made some naive assumptions, or am I relying on something that is likely to be configured differently in debug? Locally I am running an empty asp.net web project in VS2008 to make development quicker. The production server is running the sitecore CMS so is configured rather differently. Any thoughts or suggestions would be most welcome. Thanks in advance!

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  • how to fire dropdownlist.selectedindexchanged event programmaticaly.

    - by Rohit
    I have some code which fires when user selects an item in dropdownlist. Now i want the same code to fire when i set selectedindex programmatically. I have tried setting ddlSystemLevelDCP.SelectedIndex=2; and this as well ddlSystemLevelDCP.SelectedValue="2"; None of them fires this event.However when user changes the selection,this event fires.Please tell me what am i missing.

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  • In a Windows forms application, how can I setup can I set up the SelectedIndexChanged handle for 4 d

    - by Alex
    In a Windows forms application, within a DataGridView, I have 4 different DataGridCombobox controlshow can I set up the handler SelectedIndexChanged handler for the first combobox via the EditingControlShowing event. I added code for a second combobox but the SelectedIndexChanged didn't get wired up. Here's my code. Any advice would be appreciated. private ComboBox countryCombo; private EventHandler countryHandler; private ComboBox partCombo; private EventHandler partHandler; private void dataGridView2_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e) { countryCombo = e.Control as ComboBox; if (countryCombo != null) { //remove any existing handler if there is one countryCombo.SelectedIndexChanged -= countryHandler; //add the new handler countryCombo.SelectedIndexChanged += new EventHandler(countryCombo_SelectedIndexChanged); } if (partCombo != null) { partCombo.SelectedIndexChanged -= partHandler; partCombo.SelectedIndexChanged += new EventHandler(partCombo_SelectedIndexChanged); } } private void countryCombo_SelectedIndexChanged(object sender, EventArgs e) { ComboBox box = (ComboBox) sender; //MessageBox.Show(box.Items.Count.ToString()); int rowNum = dataGridView2.CurrentCell.RowIndex; dataGridView2.BeginEdit(false); dataGridView2.Rows[0].Cells[2].Value = "abcdef"; dataGridView2.EndEdit(); } private void dataGridView2_CellContentClick(object sender, DataGridViewCellEventArgs e) { int cellColumn = e.ColumnIndex; //MessageBox.Show("Column is: " + cellColumn.ToString()); } private void partCombo_SelectedIndexChanged(object sender, EventArgs e) { ComboBox box = (ComboBox)sender; string partNumber = box.SelectedValue as string; // ToDo: now we need to get the HTSUS from the database so we can //populate the field int rowNum = dataGridView2.CurrentCell.RowIndex; dataGridView2.BeginEdit(false); dataGridView2.Rows[0].Cells[2].Value = "abcdef"; dataGridView2.EndEdit(); } } Al D.

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  • SelectedIndexChanged for programmatically created dropdownlist in ASP.NET fires multiple times.

    - by Achilles
    Consider the following: dim dropdownlist1 as new dropdownlist dim dropdownlist2 as new dropdownlist dim dropdownlist3 as new dropdownlist dropdownlist1.AutoPostBack = true dropdownlist2.AutoPostBack = true dropdownlist3.AutoPostBack = true AddHandler dropdownlist1.SelectedIndexChanged, AddressOf SomeEvent AddHandler dropdownlist2.SelectedIndexChanged, AddressOf SomeEvent AddHandler dropdownlist3.SelectedIndexChanged, AddressOf SomeEvent The SomeEvent fires as expected when any of the dropdown's selection is changed. However if say DropdownList2 has a selection made then I make a selection with either DropDownList1 or DropdownList3, then SomeEvent fires again. What is causing this behavior and how do I get just a single raising of that event? I suspect that when the viewstate for the dynamcially created dropdownlists is restored and the selection restored, then the event is fired because technically the selected index did change when the control was recreated. The reason I suspect this is that the event fires the for each dropdownlist...

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  • Dropdown OnSelectedIndexChanged not firing

    - by Jim
    The OnSelectedIndexChanged event is not firing for my dropdown box. All forums I have looked at told me to add the AutoPostBack="true", but that didn't change the results. HTML: <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title></title> </head> <body> <form id="form1" runat="server"> <div> <asp:Label ID="Label1" runat="server" Text="Current Time: " /> <br /> <asp:Label ID="lblCurrent" runat="server" Text="Label" /><br /><br /> <asp:DropDownList ID="cboSelectedLocation" runat="server" AutoPostBack="true" OnSelectedIndexChanged="cboSelectedLocation_SelectedIndexChanged" /><br /><br /> <asp:Label ID="lblSelectedTime" runat="server" Text="Label" /> </div> </form> </body> </html> Code behind: public partial class _Default : System.Web.UI.Page { string _sLocation = string.Empty; string _sCurrentLoc = string.Empty; TimeSpan _tsSelectedTime; protected void Page_Load(object sender, EventArgs e) { AddTimeZones(); cboSelectedLocation.Focus(); lblCurrent.Text = "Currently in " + _sCurrentLoc + Environment.NewLine + DateTime.Now; lblSelectedTime.Text = _sLocation + ":" + Environment.NewLine + DateTime.UtcNow.Add(_tsSelectedTime); } //adds all timezone displaynames to combobox //defaults combo location to seoul, South Korea //defaults current location to current location private void AddTimeZones() { foreach(TimeZoneInfo tz in System.TimeZoneInfo.GetSystemTimeZones()) { string s = tz.DisplayName; cboSelectedLocation.Items.Add(s); if (tz.StandardName == "Korea Standard Time") cboSelectedLocation.Text = s; if (tz.StandardName == System.TimeZone.CurrentTimeZone.StandardName) _sCurrentLoc = tz.StandardName; } } //changes timezone name and time depending on what is selected in the cbobox. protected void cboSelectedLocation_SelectedIndexChanged(object sender, EventArgs e) { foreach (TimeZoneInfo tz in System.TimeZoneInfo.GetSystemTimeZones()) { if (cboSelectedLocation.Text == tz.DisplayName) { _sLocation = tz.StandardName; _tsSelectedTime = tz.GetUtcOffset(DateTime.UtcNow); } } } } Any advice into what to look at for a rookie asp coder? EDIT: added more code behind

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  • Retreiving data from grid view cell to a text box

    - by Bader
    Hello , i am trying to retrieve a cell data to a textbox , that will happen when i select any row in the grid view , the textbox will take the new value i already enabled auto post back to the textbox here is my code protected void GridView2_SelectedIndexChanged(object sender, EventArgs e) { TextBox3.Text = GridView2.Rows[GridView2.SelectedIndex].Cells[2].Text; } however , there is not error in the syntax , it doesn't retrieve any thing in the textbox , any suggestions ? i am using using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.Data.SqlClient; using System.Data.Sql; i work in C# , Visual studio 2010 express web developer

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  • How do I detect a change of tab page in TabControl prior to SelectedIndexChanged event?

    - by JYelton
    I currently determine what page of a tabcontrol was clicked on via the SelectedIndexChanged event. I would like to detect before the selected index actually changes, for validation purposes. For example, a user clicks a tab page other than the one they are viewing. A dialog is presented if form data is unsaved and asks if it's ok to proceed. If the user clicks no, I'd like to remain on the current tab. Currently I have to remember the previous tab page and switch back to it after an answer of 'no.' I considered MouseDown (and the assorted calculation logic), but I doubt that's the best way. (This is in .NET C# 3.5)

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  • ASP.NET gridview control in side update panel has a problem

    - by Eyla
    Greetings, I have gridview with SelectedIndexChanged event. when I click on a record in gridview it should call the SelectedIndexChanged event and do some operations. SelectedIndexChanged event is working OK, but when I put the gridview inside ajax updatepanle SelectedIndexChanged event will not response even if I add AsyncPostBackTrigger trigger for SelectedIndexChanged event. Please look at my code and advice me what I should do!! Thank you <%@ Page Title="" Language="C#" MasterPageFile="~/Master.Master" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="IMAM_APPLICATION.WebForm1" %> <%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %> <asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="server"> <div id="mydiv"> <asp:UpdatePanel ID="UpdatePanel1" runat="server"> <ContentTemplate> <br /> <br /> <br /> <asp:GridView ID="GridView1" runat="server" style="position:absolute; top: 280px; left: 30px; height: 240px; width: 915px;" PageSize="5" onselectedindexchanged="GridView1_SelectedIndexChanged" AutoGenerateColumns="False" DataKeyNames="idcontact_info"> <Columns> <asp:CommandField ShowSelectButton="True" /> <asp:BoundField AccessibleHeaderText="Midle Name" DataField="Midle_Name" /> <asp:BoundField DataField="Last_Name" HeaderText="Last Name" /> <asp:BoundField DataField="Phone_home" HeaderText="Phone Home" /> <asp:BoundField DataField="cell_home" HeaderText="Mobile Home" /> <asp:BoundField DataField="phone_work" HeaderText="Phone Work" /> <asp:BoundField DataField="cell_Work" HeaderText="Mobile Work" /> <asp:BoundField DataField="Email_Home" HeaderText="Personal Home" /> <asp:BoundField DataField="Email_work" HeaderText="Work Email" /> </Columns> </asp:GridView> <br /> <br /> <br /></ContentTemplate> <Triggers> <asp:AsyncPostBackTrigger ControlID="GridView1" EventName="SelectedIndexChanged" /> </Triggers> </asp:UpdatePanel> <asp:RadioButton ID="rdoSearchFlat" runat="server" style="position:absolute; top: 565px; left: 70px;" Text="Flat Search" GroupName="Search"/> <asp:TextBox ID="txtSearch" runat="server" style="position:absolute; top: 560px; left: 170px;" ></asp:TextBox> <asp:Button ID="btnSearch" runat="server" Text="Search" style="position:absolute; top: 555px; left: 375px;" CausesValidation="False" onclick="btnSearch_Click"/> <asp:Label ID="Label7" runat="server" Style="position: absolute; top: 630px; left: 85px;" Text="First Name"></asp:Label> <asp:TextBox ID="txtFirstName" runat="server" Style="top: 630px; left: 185px; position: absolute; height: 22px; width: 128px"> </asp:TextBox> </div> </asp:Content>

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  • control with ID 'GridView1' could not be found for the trigger in UpdatePanel 'UpdatePanel1'

    - by Kk
    I have two gridview in update panel and m adding entries from one gridview to another on selectedIndexChanged event what m trying to do is updating update panel on this event selectedindexchanged ...but my gridview is inside accordian control so it does not get initialized and hence i get this error ..... control with ID 'GridView1' could not be found for the trigger in UpdatePanel 'UpdatePanel1' Anybody knows solution?

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  • When i am adding eventHandler on combo in datagridview, its adding eventHandler to all other combo o

    - by Rajesh Rolen- DotNet Developer
    i am using VS2005 (c#.net desktop application). when i am adding eventHandler to a combo of datagridview, its automatically adding same eventhandler to all other combos of same datagridview.. my code: private void dgvtstestdetail_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e) { DataGridView grid = (sender as DataGridView); if (grid.CurrentCell.OwningColumn == grid.Columns["gdvtstd_TestParameter"]) { ComboBox cb = (e.Control as ComboBox); cb.SelectedIndexChanged -= new EventHandler(dvgCombo_SelectedIndexChanged); cb.SelectedIndexChanged += new EventHandler(dvgCombo_SelectedIndexChanged); } }

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  • How can I programmatically add triggers to an ASP.NET UpdatePanel?

    - by scottm
    I am trying to write a quote generator. For each product, there are a set of options. I want to dynamically add a drop down list for each option, and then have their SelectedIndexChanged events all wired up to update the quote cost. I am not having any trouble adding the DropDownList controls to my UpdatePanel, but I can't seem to wire up the events. After the page loads, the drop downs are there, with their data, but changing them does not call the SelectedIndexChanged event handler, nor does the QuoteUpdatePanel update. I have something like this: QuotePanel.ASCX <asp:ScriptManager ID="ScriptManager" runat="server" /> <asp:UpdatePanel ID="QuoteUpdatePanel" runat="server" ChildrenAsTriggers="true"> <ContentTemplate> Cost: <asp:Label ID="QuoteCostLabel" runat="server" /> <fieldset id="standard-options"> <legend>Standard Options</legend> <asp:UpdatePanel ID="StandardOptionsUpdatePanel" runat="server" ChildrenAsTriggers="true" UpdateMode="Conditional"> <ContentTemplate> </ContentTemplate> </asp:UpdatePanel> </fieldset> </ContentTemplate> </asp:UpdatePanel> The code to add the dropdowns and the event they are to be wire up for: protected void PopluateUpdatePanel(IQuoteProperty standardOptions) foreach (IQuoteProperty standardOp in standardOptions) { QuotePropertyDropDownList<IQuoteProperty> dropDownList = new QuotePropertyDropDownList<IQuoteProperty>(standardOp); dropDownList.SelectedIndexChanged += new EventHandler(QuotePropertyDropDown_SelectedIndexChanged); dropDownList.ID = standardOp.GetType().Name + "DropDownList"; ScriptManager.RegisterAsyncPostBackControl(dropDownList); Label propertyLabel = new Label() {Text = standardOp.Title, CssClass = "quote-property-label"}; this.StandardOptionsUpdatePanel.ContentTemplateContainer.Controls.Add(propertyLabel); this.StandardOptionsUpdatePanel.ContentTemplateContainer.Controls.Add(dropDownList); _standardOptionsListBoxes.Add(dropDownList); AsyncPostBackTrigger trigger = new AsyncPostBackTrigger() { ControlID = dropDownList.UniqueID, EventName = "SelectedIndexChanged" }; this.StandardOptionsUpdatePanel.Triggers.Add(trigger); } } void QuotePropertyDropDown_SelectedIndexChanged(object sender, EventArgs e) { QuoteCostLabel.Text = QuoteCost.ToString(); }

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  • No Change for Index of DropDownList in a Custom Control!!!

    - by mahdiahmadirad
    Hi Dears, I have Created A Custom Control which is a DropDownList with specified Items. I designed AutoPostback and SelectedCategoryId as Properties and SelectedIndexChanged as Event for My Custom Control. Here Is My ASCX file Behind Code: private int _selectedCategoryId; private bool _autoPostback = false; public event EventHandler SelectedIndexChanged; public void BindData() { //Some Code... } protected void Page_Load(object sender, EventArgs e) { BindData(); DropDownList1.AutoPostBack = this._autoPostback; } public int SelectedCategoryId { get { return int.Parse(this.DropDownList1.SelectedItem.Value); } set { this._selectedCategoryId = value; } } public string AutoPostback { get { return this.DropDownList1.AutoPostBack.ToString(); } set { this._autoPostback = Convert.ToBoolean(value); } } protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e) { if (SelectedIndexChanged != null) SelectedIndexChanged(this, EventArgs.Empty); } I Want Used Update Panel to Update Textbox Fields According to dorp down list selected index. this is my code in ASPX page: <asp:Panel ID="PanelCategory" runat="server"> <p> Select Product Category:&nbsp; <myCtrl:CategoryDDL ID="CategoryDDL1" AutoPostback="true" OnSelectedIndexChanged="CategoryIndexChanged" SelectedCategoryId="0" runat="server" /> </p> <hr /> </asp:Panel> <asp:UpdatePanel ID="UpdatePanelEdit" runat="server"> <ContentTemplate> <%--Some TextBoxes and Other Controls--%> </ContentTemplate> <Triggers> <asp:PostBackTrigger ControlID="CategoryDDL1" /> </Triggers> </asp:UpdatePanel> But Always The Selected Index of CategoryDDL1 is 0(Like default). this means Only Zero Value will pass to the event to update textboxes Data. what is the wrong with my code? why the selected Index not Changing? Help?

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  • Casting error in my form

    - by Siva
    I have a ComboBox in a DataGridView. However I get an error when I run it: Unable to cast object of type 'System.Windows.Forms.DataGridView' to type 'System.Windows.Forms.ComboBox'. What can I do to resolve this error? ComboBox comboBox; private void dataGridView1_EditingControlShowing(object sender, DataGridViewEditingControlShowingEventArgs e) { if (e.Control is ComboBox) { comboBox = e.Control as ComboBox; if (dataGridView1.CurrentCell.ColumnIndex >= 0) { System.Diagnostics.Debug.WriteLine("Edit Control Showing"); comboBox.SelectedIndexChanged -= new EventHandler(comboBoxItems_SelectedIndexChanged); comboBox.SelectedIndexChanged += new EventHandler(comboBoxItems_SelectedIndexChanged); } } } void comboBoxItems_SelectedIndexChanged(object sender, EventArgs e) { try { int comboBoxSelectedIndex = ((ComboBox)sender).SelectedIndex; string comboboxSelectedValue = ((ComboBox)sender).SelectedText; int gridViewSelectedRow = dataGridView1.CurrentRow.Index; if (comboBoxSelectedIndex >= 0 && gridViewSelectedRow >= 0) { System.Diagnostics.Debug.WriteLine("ComboBox Index - " + comboBoxSelectedIndex); System.Diagnostics.Debug.WriteLine("GridView Index - " + gridViewSelectedRow); if (comboBox != null) { comboBox.SelectedIndexChanged -= new EventHandler(comboBoxItems_SelectedIndexChanged); } } } catch(Exception E) { } }

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  • How to update control state in asp.net/ajax?

    - by darth_alexious
    I'm trying to update certain controls according to a selection in a dropdown list. For example, in the "selectedIndexChanged" event of a dropDownList, if a user selects the value "sport-car" the text box "payload" is disabled and the textbox "max speed" is enabled. private sub dropDownList1_SelectedIndexChanged(byval sender as object, byval e as eventargs) handles dropDownList1.SelectedIndexChanged If dropDownList1.selectedValue = "sport-car" then textBox_payLoad.enabled = false textBox_maxSpeed.enabled = true end if end sub When I'm doing something like this, the controls aren't enabled/disabled, even the event (wich I've added a breakpoint) seems not to be raised (sometimes several time after it is raised). Also, when the instructions in the condition is executed, nothing changes. What am I doing wrong? Maybe this is a very easy issue, but I'm a begginer in MS Visual Web Developer.

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  • Winforms controls and "generic" events handlers. How can I do this?

    - by Yanko Hernández Alvarez
    In the demo of the ObjectListView control there is this code (in the "Complex Example" tab page) to allow for a custom editor (a ComboBox) (Adapted to my case and edited for clarity): EventHandler CurrentEH; private void ObjectListView_CellEditStarting(object sender, CellEditEventArgs e) { if (e.Column == SomeCol) { ISomeInterface M = (e.RowObject as ObjectListView1Row).SomeObject; //(1) ComboBox cb = new ComboBox(); cb.Bounds = e.CellBounds; cb.DropDownStyle = ComboBoxStyle.DropDownList; cb.DataSource = ISomeOtherObjectCollection; cb.DisplayMember = "propertyName"; cb.DataBindings.Add("SelectedItem", M, "ISomeOtherObject", false, DataSourceUpdateMode.Never); e.Control = cb; cb.SelectedIndexChanged += CurrentEH = (object sender2, EventArgs e2) => M.ISomeOtherObject = (ISomeOtherObject)((ComboBox)sender2).SelectedValue; //(2) } } private void ObjectListView_CellEditFinishing(object sender, CellEditEventArgs e) { if (e.Column == SomeCol) { // Stop listening for change events ((ComboBox)e.Control).SelectedIndexChanged -= CurrentEH; // Any updating will have been down in the SelectedIndexChanged // event handler. // Here we simply make the list redraw the involved ListViewItem ((ObjectListView)sender).RefreshItem(e.ListViewItem); // We have updated the model object, so we cancel the auto update e.Cancel = true; } } I have too many other columns with combo editors inside objectlistviews to use a copy& paste strategy (besides, copy&paste is a serious source of bugs), so I tried to parameterize the code to keep the code duplication to a minimum. ObjectListView_CellEditFinishing is a piece of cake: HashSet<OLVColumn> cbColumns = new HashSet<OLVColumn> (new OLVColumn[] { SomeCol, SomeCol2, ...}; private void ObjectListView_CellEditFinishing(object sender, CellEditEventArgs e) { if (cbColumns.Contains(e.Column)) ... but ObjectListView_CellEditStarting is the problematic. I guess in CellEditStarting I will have to discriminate each case separately: private void ObjectListView_CellEditStarting(object sender, CellEditEventArgs e) { if (e.Column == SomeCol) // code to create the combo, put the correct list as the datasource, etc. else if (e.Column == SomeOtherCol) // code to create the combo, put the correct list as the datasource, etc. And so on. But how can I parameterize the "code to create the combo, put the correct list as the datasource, etc."? Problem lines are (1) Get SomeObject. the property NAME varies. (2) Set ISomeOtherObject, the property name varies too. The types vary too, but I can cover those cases with a generic method combined with a not so "typesafe" API (for instance, the cb.DataBindings.Add and cb.DataSource both use an object) Reflection? more lambdas? Any ideas? Any other way to do the same? PS: I want to be able to do something like this: private void ObjectListView_CellEditStarting(object sender, CellEditEventArgs e) { if (e.Column == SomeCol) SetUpCombo<ISomeInterface>(ISomeOtherObjectCollection, "propertyName", SomeObject, ISomeOtherObject); else if (e.Column == SomeOtherCol) SetUpCombo<ISomeInterface2>(ISomeOtherObject2Collection, "propertyName2", SomeObject2 ISomeOtherObject2); and so on. Or something like that. I know, parameters SomeObject and ISomeOtherObject are not real parameters per see, but you get the idea of what I want. I want not to repeat the same code skeleton again and again and again. One solution would be "preprocessor generics" like C's DEFINE, but I don't thing c# has something like that. So, does anyone have some alternate ideas to solve this?

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