I want to display whatever i select in the listbox into a label.
I thought it was as simple as this but nothing seems appear.
Protected Sub lbxInstalledPrograms_SelectionIndexChanged(By Val sender As _ Object, ByVal e As EventArgs) Handles _ lbxInstalledPrograms.SelectedIndexChanged
lblDisplayDetails.Text = lbxInstalledPrograms.SelectedItem.ToString()
How 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.
I have two ASP.NET ListBoxex in a usercontrol.
databinding event fires once. i am sure and i did trace.
but listbox always returns first value !
it is strange for me.
and i don't know how to fix it.
[code]....
As you can see in the picture below i've got a Page control with inital letters which cotains a listbox showing different wood articles. When i click on a Tab, the selected tab page get's a new Listbox control with the wood articels starting with the selected initial letter.
Creating the listbox:
[Code]....
[Code]....
When i click on a item inside the listbox, following code will be executed:
[Code]....
So far, it works fine for me. But when i change the selected Tabpage, the first SelectedIndexChanged in the listbox in the new shown tabpage is not recordnized. That means i have to select a new item and click on Search = the selected Item is still the item i selected before i changed the tab. Then i select the item again and click on search the index changed is recordnized. So why do i have to click two times on search to get the new selected item after a tab page changed?
Here is the full code:
Searchpanel:
[Code]....
The WC_WoodList
[Code]....
I must be doing something wrong, but this makes sense to me. I have a Listbox loaded with tons of items from a datasource. A user clicks one of these items it grabs the selectedindex (an integer) and stores it in a HiddenField (works fine).
Now when the page does a complete a refresh (after postback) I want the ListBox to go back to that selectedindex that is in the HiddenField. Problem is, it seems that after postback the HiddenField is empty? Then I thought about storing the value in an Integer variable in code, but that is simply coming up as a zero at all times.
Question 1: What is the best/simplest way to do this?
Question 2: How?
I am currently grabbing it on selectedindex change
[Code]....
Can i get the selected index,selected value , selected text using javascript of ajax combobox control. if yes send me the sample code.
View 7 Replieshow I can read the selected field from the listbox?I have MSAccess table attached to the app.I can get to the properties, but I don't know which property gets me the data of the specific field.In VB it would be "listbox1.Column(x)", where 'x' represents the column number in the listbox1.I am using Microsoft Visual Web Developer 2010 Express
View 2 RepliesTwo ListBox Items Compare and Distinct Values Insert Into Third ListBox
View 1 RepliesI have two control page in my aspx page. first one left side "tree view",second one right side " form design".Form design will change based on tree view selected index changed.i have 4 level child node(site, master , slave, space). I have seperate forms to each level of node.
cannot update tree node when update the forms. so i reload tree view.
now i need how to auto selected index change to tree node.
ex.
1 parent node
1.1 child node
1.2 child node
i have update "1.2 child node" rename to "1.3 child node"
and reload treeview so it will chage...
how set tree node.selected index = 1.3 child node....
My question is probably a simple one to people used to ASP.NET, So here it is:
I have a webform in a master page that has a listbox which populates itself with numbers which serve as unique id for my objects.
The only problem is that the selected index property of the listbox is always -1 and it automatically deselects itself, no matter what I select. I understand that the index is -1 when you havent selected anyhting, but I have. Here is my C# code that I used to test it and my ASP.NET code:
[code]....
I use the first message box to see what the selected index is and the second to check my 3rd items in the listbox is being recognised.
[code]....
I'm having trouble getting selected items in a listbox to be seen as selected. On my aspx page there's a listbox and a button:
[Code]....
But if I change my condition to Not selected, the string does build, with every item in the list. So the Sub is reached, the items and their text and values are seen, but user selection of items doesn't work. What am I missing?
I have a set of values in a listbox on an ASP webform. I can select items, and in code, if the user selects some row from a different grid, the listbox shows the correct value. The user can also select a different value. All of this appears to work as I would expect. However, that's as far as it goes. At first, the SelectedIndexChanged event wasn't firing. I determined that was because I hadn't hooked up the event handler, which I did with this:
Code:
asp:ListBox ID="AgencyListBox" runat="server" OnSelectedIndexChanged="AgencyListBox_SelectedIndexChanged" EnableViewState = "true">
(the EnableViewState wasn't part of that solution. I added it later)
Now, the SelectedIndexChanged event fires, though it doesn't fire when the user selects something, it changes later, possibly in response to an AutoPostBack, since I read that will trigger the SelectedIndexChanged event. That's fine with me, either time will work ok. However, the SelectedIndex itself is always -1, as if nothing was ever selected. In fact, though I can see visually that something is selected, I have yet to figure out what that was, or how to access the index, the text, or anything even the fact that something was selected.
I have up and down arrows next to a listbox and i need to switch the actual index of the item.
It is very similar to this thread: [URL]
But what actually I want is, if the listbox is like
item1
item2 (selected)
item3
So after clicking on down button it should display the listbox in following way
item1
item3
item2(selected)
The selected item should move downwards.
I have a SQL table used by a third party application that I have very little control over. The table contains a list of assemblies and their corresponding serial numbers. The tables primary key is a composite of the assembly number and serial number. There is no field I can use, reliably as an index.
I have an application I'm working on that pulls all the serial numbers from that table based on the assembly in a SQL View. I've then written code that pulls the serial numbers from that view based on the part number in a textbox on the form. That functionality works fine but I had both my datatextfield and datavaluefield set to the serial number. I've created another empty listbox that I would like to populate from a serial number or serial numbers being selected in the first. That is not working, I believe, because there is no index for the list.
My question is...How can I add an index value to each serial number as they populate from the SQL table. I've included the code below that I have pulling the serial number values.
This is an ASP.net VB webform.
Code:
Private Sub FillSnAvailList()
Dim strconnect1 As String = ("Data Source=MyDataSource")
Dim con1 As New SqlConnection(strconnect1)
con1.Open()
Dim cmd1 As New SqlCommand("SELECT [sPartNum], [SerialNum] FROM [V_MaxSerialNum] WHERE ([sPartNum] = @sPartNum)", con1)
[Code] ....
I have some problem to understand how this example works with the updatepanel. I have put a ListBox4 and a label inside an updatepanel and put the property for the ListBox to AutoPostBack = true; So what I now am trying to do is when I click on the four items in the ListBox, I want the label to update the new String that is clicked in the ListBox. However what first happens when I click the 2:nd item is that I get the error:
Index was out of range. Must be non-negative and less than the size of the collection. I wonder what the correct way is to do this. I am not sure to know what is right here ? I think many example I do will be solved if I learn this one.
[Code]....
This code will display the selected value from the listbox. E.g. if I sellect Item 1 I will get the following output: You have selected Item 1.
Label1.Text = "You have selected " + DropDownList1.SelectedValue + "<br />";
But if I don't select anything and click on Submit button, I will get: You have selected
What would I need to make it display "You have not selected anything. select at least 1 item."
UPDATE: I am using ASP.NET WebForms.
I am binding months to a list 0-13 items default selection is 0 months duration, and years 0-8 items and 0 years is the default selection.As I know there are always going to be 12 months in a year, I could use selectedvalue or selectedindex without any perceived problem. Is there a reason why I should not use either/or of the two properties to select a list item?
View 2 RepliesI have a listBox that is bounds its content from the database. This control is inside an itemTemplate. When the item template is boudned, I want to select the corresponding value.
I have this ugly single line of code:
[Code]....
What it does is to select the right value to a ListBox that is databinded with values inside a DetailsView
here is the rest of the code:
<asp:DetailsView ID="DetailsView1" runat="server" AutoGenerateRows="False" DataKeyNames="ID" DataSourceID="SqlDataSource4"
EnableModelValidation="True" ondatabound="DetailsView1_DataBound">
<Fields><asp:TemplateField><ItemTemplate>
<asp:ListBox ID="lbATechAuthCheck" runat="server" Width="100%" DataSourceID="SqlDataSource2" DataTextField="status" DataValueField="id"></asp:ListBox><asp:SqlDataSource ID="SqlDataSource2" runat="server" ConnectionString="<%$ ConnectionStrings:myConnectionString
%>"SelectCommand="SELECT * FROM [Status]"></asp:SqlDataSource>
</ItemTemplate></asp:TemplateField></Fields></asp:DetailsView>
Is there an easier way to achieve the same thing perhaps without any code behind?
Why I am unable to setfocus to my list box if the index > 820
My list box contains 2000 items and the index is not able to set the focus if the index > 820
I've got a list box that's populated by the user, I want to enter the selected items into an array, however I need both the indexes they have in the listbox as a whole, as well as their values.
For example, let's say that there is a listbox with 3 values and the user has selected just the first 2.
I would like to do a "for each" statement on only the selected items, so I would need their listbox indexes, the selected items indexes and their textual values.
I've tried multiple paths but all seem to just give me the textual representation of the selected item, but getting the correct indexes seems to be a problem for me.
I am display the item like this
<%=Html.ListBox("emp",(SelectList)ViewData["emp"] })%>
how to get the selected text from it..
i formcollection fc["emp"] iam gettin the option values
25
26
27
how to get the text...
how to modify so that I can get the selected value into the textbox from this listbox selection.
[Code]....
i want to make one value always selected in listbox.....so that user doesnt go without selecting any...that is one remain always selected state
View 3 Repliesthis works only when autopostback=TRUE. why is this?
View 5 RepliesI have a couple pages that are all pretty similar. Each of these pages consists of some number of views. Roughly speaking the first four views on each page are the same. The first page has a listbox and a textbox, then next several pages have listboxes. Because these views are the same between all the pages, and because the code behind them is the same, I built up the first page and got it working, then copied and pasted the information over for the other pages. The pages all differ in what the textbox does, but the listboxes are all identical in every way.
So, what I am seeing is that the original page works perfectly. When I go to any of the other pages, the behavior is bizarre. I was a bit surprised to find when the SelectedIndexChanged event was raised for the listbox, but it's fine. In the SelectedIndexChanged event, some minor stuff needs to happen as long as the selectedIndex is not -1. I am getting the SelectedIndexChanged event when it should happen. I see this by putting a breakpoint in the event handler. The SelectedIndex is ALWAYS -1. I can't get the SelectedIndex to be anything else, though it works in the original page from which the code was copied.
Naturally, I assumed that I had overlooked some change in the copying and pasting. That doesn't appear to be the case, but it still makes the most sense. The event is triggered by a change in the selectedIndex on the page that is currently loaded. However, the SelectedIndex hasn't changed because it was -1 and is still -1. The SelectedItem is still nothing, as it was before. There also isn't any problem that I can find with the copying and pasting. I even tried renaming two of the listboxes on one of the pages so that they would be truly distinct from the page that was working (different ID, which shouldn't matter since they are different fields). This had no impact. Nothing I can do will cause the SelectedIndex to be anything other than -1.
