Web Forms :: How To Add Event To ListBox Dynamically
Jul 6, 2010Have a ListBox which is created dynamically,when an item in the Listbox is selected a event needs to be raised.How to add a event for ListBox dynamically.using VB.NET
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ListBox_Admin.Items.Add("");
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View 1 RepliesWeb Forms :: Dynamically Populated Listbox Always Return Selected Items As False?
Mar 10, 2011I have the following code which simply gets data from a table and populates the questions_lb listbox with items. I have a button on the page, which when clicked, should write (on submit) the selected state of each of the items. The code below writes the text values of each of the items fine however it always writes the li.Selected as False even though i have selected items from the list. Note that you can select Multiple items from the list. Does anyone have a clue why its not writing 'True' for an item that is selected on submit?
[Code]....
Web Forms :: Handle The ListBox Double Click event?
Jul 14, 2010I wanted to catch and handle the ListBox Double Click event and looked for some sort of mehtod to do this. In one of the articles i found the usage of;
Request("__EVENTARGUMENT")
-------------CODE----------------
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[Code]....
Web Forms :: Form Submits When Onchange Event Is Triggered In A Listbox?
Mar 9, 2011My forst post here + I am new to Asp.Net as well. 2nd my apologies if this question has been asked before.
Here is my problem. I am given some really abstract ASP.net pages, where I have to make a change. My change involves adding some links and on each link I have a function which is triggered when link is clicked on. This function validates some information in the form and then submits this form. This same form contains mulitple list boxes, all of them has AutoPostBack=true. The problem is when I select an item from listbox the form is submitted as I can print all the form properies on the page(all fields with their names and values) however, when I click on link and call the same forms submit(); method I dont see that happening. none of the form fields are printed out.
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How To Dynamically Generate Listbox Items
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<%
Dim y As Integer
Dim NextTime As Date = Now
Dim bday_yr As New ListItem()
y = 0
For y = 17 To 25
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%>
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View 4 RepliesC# - Dynamically Added ListBox's EventHandler Is Not Firing?
Nov 20, 2010The scenerio is I have a UserControl. This user control will create dynamically ListBoxes if the given List's count > 0. The controls are adding dynamically, there is no problem with adding them, but the event handler is not adding. If I select an item in first listBox, the secondListBox will be added dynamically, and items will add dynamically too. First listBox appears, but the selectedIndexChanged event handler doesn't work. What can be the problem with my code?
EDIT: I tried to add
li.Attributes.Add("onselectedindexchanged","selectedIndexChanged");
or
li.AutoPostBack = true;
but still not firing...
private List<string> myList = new List<string>() { "Serkan", "Kadir" };
private List<string> mySecondList = new List<string>() { "Istanbul", "Ankara" };
protected void Page_Load(object sender, EventArgs e)
{
[Code]....
Create Texbox Dynamically As Per The Selected Record In A Listbox?
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View 3 RepliesDisable Listbox's Click Event?
Mar 28, 2010I have a listbox which acts as a list of items. If you click on some item, it's contents are shown in the panel on the right (few textboxes etc.). I need to have a validation on these controls as all of them are required fields. And I do have it. The problem is that, even when the validators are not valid, user can click the listbox and change active index (that doesn't have impact on the panel on the right, as SelectedIndexChanged isn't fired). The validators are standard RequiredFieldValidator with their Display property set to "Dynamic". So, what I want is to disallow the user clicking on the listbox and changing the index untill all validators are Valid. What would be your solution for that? Is that even possible?
View 1 RepliesJavascript - Does The ListBox SelectedIndexChanged Event Require Postback
Oct 25, 2010I'm trying to add a JavaScript function to show all selected items from a ListBox as concatentated strings in a Label on the page. It's needed because AutoPostBack="true" will cause the ListBox to scroll all the way back to the first selected item.
So this code works:
<script type="text/javascript">
function Updatelist() {
var sel = document.getElementById('<%=lstbxStuff.ClientID%>');
var lbl = document.getElementById('ctl00_cph_lblSelectedStuff');
[Code]....
Unfortunately I still need the code behind SelectedIndexChanged delegate. Is there a way to use both of these without doing a PostBack? When I set AutoPostBack="false", my delegate never seems to be reached.
ListBox Dosn't Fire OnSelectedIndexChanged Event When SelectedIndex Is Changed?
Aug 24, 2010I have an asp.net page with a list box on it. Multiple event handlers subscribe to its OnSelectedIndexChanged event.
When I change the SelectedIndex programmatically none of the events get fired.
Now a hack for this is to call each event handler, but this has already caused bugs since people didn't know they had to do this when adding a new event handler.
I can do this in a Winforms app and even when SelectedIndex is changed in code the events fire.
Forms Data Controls :: Get The Selected Item From The Listbox In The Selected Index Changed Event
Feb 28, 2011How to get the selected item from the listbox in the selected index changed event. I tried: Label1.Text = ListBox1.SelectedItem.Text; It is giving me object set to null reference.
foreach (ListItem item in ListBox1.Items)
{
if (item.Selected)
{
//lblResults.Text += item.Text + "
";
Label1.Text = item.Text;
}
}
No use, no value coming in to label.
Custom Server Controls :: Persist Data In A Dynamically Populated ListBox In A User Control
Aug 19, 2010I am trying to persist data in a dynamically populated ListBox in a user control. Here are the details
I have a user control which contains a a listBox and button. On Page_Load of user control I am populating the ListBox control with some values. On Click of button, I am trying to fetch the values which I have selected in ListBox. Though this seems very simple and straight forward I am unable to fetch values.
My Page_Load Function
void Page_Load(object sender, EventArgs e)
{
If(!IspostBack)
{
listBox.items.Add("Item1");
listBox.items.Add("item2");
listBox.items.Add("item3");
}
}
My Click Function
Protected Void Button1_Click(object sender, EventArgs e)
{
string strValue = listBox.SelectedValue
}
I have placed brake point at Page_Load and on click function, I am seeing that the moment the breakpoint hits Page_Load function (before If (!Ispostback)) , listBox.SelectedIndex is becoming -1.
One more thing here is, I am placing this user control in an SharePoint application page to be specific checkin.aspx page . ( I know this should not be done, but that is the requirement for me)
Forms Data Controls :: ListBox, Array List / Update The Listbox Content?
Mar 26, 2011I am designing a program that will let me enter the name of an item to swap and adds the swap to an array list when a button Add is pressed. Once the item is added to the array list a Sub Procedure should be called which displays the contents of the array list in a list box.
The system will also allow me to remove items from the array list using a Remove button
followed by updating array list.
I have done some part which puts item into the listbox1 which i named lstSwapList.I would need some assistance on the Sub Procedure to display the Value or Description on the other listbox2 which i have also named lstContent,if a value is selected from the listbox1.
I would also want to know how to update the Listbox content,However i hv added a sample of the way i guess it may be.
Any complete solution from anybody on the Sub Procedure and the Update Swap procedure will be greately appreciated.
The script below is what i have done so far.
Partial Class _Default
Inherits System.Web.UI.Page
Protected Sub lstContent_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles lstContent.SelectedIndexChanged
End Sub
Protected Sub lstSwapList_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles lstSwapList.SelectedIndexChanged
End Sub
Protected Sub btnAddSwap_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnAddSwap.Click
Dim SwapValue As String = "Sixty Pounds"
Dim Counter As Integer = 8
Dim SwapN0 As Integer
lstSwapList.Items.Add(SwapValue)
lstSwapList.Items.Add(Counter)
lstSwapList.Items.Add(New ListItem("300", "1"))
lstSwapList.Items.Add(New ListItem("ASP.Net", "2"))
lstSwapList.Items.Add(New ListItem("Programming", "3"))
SwapN0 = lstSwapList.SelectedValue
For Counter = 0 To -1
SwapN0 = lstContent.Items.Count
Next
End Sub
Protected Sub btnDeleteSwap_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnDeleteSwap.Click
lstSwapList.Items.Remove(lstSwapList.SelectedValue)
End Sub
Protected Sub btnUpdateSwap_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnUpdateSwap.Click
End Sub
End Class
=======================================
Sub UpdateSwap(ByVal valueA As String, ByVal ValueBAs String, ByVal ValueC As Integer, ByVal ValueD As Date)
Web Forms :: Adding Item To Listbox From Another Listbox Taking Way Too Long?
Mar 4, 2010I have two list boxes, one has a list of available users (about 1500 items) and the other is blank. There is a button to add the seleted items from the first list box to the second one. Both of these listboxes are within an update panel and for some reason it takes over 20 seconds for the items to show up in the second listbox.
Is this normal? Is there an alternate, faster way of doing this?
Web Forms :: Dynamically Create Controls With Event?
Jun 5, 2010I trying to create some Linkbutton dynamically. And I have 2 problem.
1. I created LinkButton. But When I see "Vew Source" in IE in shown <a></a>
2 When i clicked on Link . It thrown this exception :"Microsoft JScript runtime error: 'link1_Click' is undefined"
[Code]....
Web Forms :: Event Of Dynamically Created CheckBox?
Jan 20, 2010i am desigining an application where i m creating checkBox (not checkBoxList) dynamically. There is one master check box that define group if i click that it should click all subCheck box under it.I am using ajax in my application.i am able to generate check box at runtime but not able to find its event here is the code for creating check
box and its event.
//This define master check box
CheckBox MstChk = new CheckBox();
MstChk.ID = Str_Header;
MstChk.AutoPostBack = true;
MstChk.CheckedChanged += new System.EventHandler(MstChk_CheckedChanged);
[code]...
now problem is here when i click on masterCheckBox i am not able to get Evnet MstChk_CheckedChanged but if call DesignUserPrivilegePnl() in page_init instant of Page_Load i am able to get the event but then i get erro object instatnt not set to an instat of object at foreach (Control Child in Parent.Controls)i am googled but still not get the solution hope you people will guide to overcome my error
Web Forms :: Event Not Firing On Dynamically Added Control
Feb 23, 2011While I am using a "Telerik" control here it shouldn't be any different I guess;
[code]....
What happens is that the control is created and rendered;
When I change value in the Combo box a Post-Back happens.
HOWEVER, the event RadComboBoxSelectedIndexChanged does not fire. Also when I am back at the page the new value is not saved; Obviously, i recreate the control every time. If I don't I get a ViewState error. Seems to me that there some ViewState management problem, but I cannot identify it...
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Jul 12, 2010created a control dynamicly in page_load event then cant i make that control globaly available in each class?
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Oct 5, 2010Does anyone have a good vb example of adding an "onClick" event to a button that is dynamically added into a templatefield of a gridview. MSDN just says to use the addhandler statement with no other good info for a 'dynamic' scenario:
[URL]