Set Of Values In Listbox - How To Access Index
Jul 2, 2013
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.
View 17 Replies
Similar Messages:
Jun 27, 2014
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] ....
View 3 Replies
Sep 14, 2010
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]....
View 1 Replies
Jun 29, 2011
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()
View 20 Replies
Feb 19, 2011
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]....
View 1 Replies
Feb 8, 2010
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.
View 4 Replies
Oct 25, 2010
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]....
View 3 Replies
May 2, 2010
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]....
View 2 Replies
Mar 23, 2010
I 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?
View 7 Replies
Jan 4, 2011
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]....
View 2 Replies
Sep 13, 2010
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
View 6 Replies
Feb 28, 2011
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.
View 5 Replies
Dec 23, 2010
I'm adding ListItems to a ListBox from two controls, both are DropDownLists. The ListItem has the properties ListItem.SelectedItem and ListItem.SelectedValue, but I also want the ListBox to keep track of which DropDownList the ListItem came from.What would be the best way to do this?
View 4 Replies
Jan 28, 2010
I have some files listed on a listbox and want to upload them to the server. The values doesn't need to be selected. But I can't even get it working. Below is my source code:
[Code]....
Where is the bug in the code above?
View 4 Replies
Jan 11, 2010
I'm currently trying to move through all the values added to a listbox by the user, however, I want to retrieve the actual value of each item in the listbox and not the text.
I've gotten so far with the code below, but that only gets the text and not the value.
[code]....
How would I go about getting the value for each item in the collection?
View 3 Replies
Apr 9, 2010
Hey what i am trying to do is i have a listbox with some simple values in it
1
2
3
and what i want to do is add a value that has multiple values to it...for instance i want a value = All DEV which will represent many values in itself so that once ALL DEV is selected it actually has many different numbers assigned to it. Can this be done? I understand that the value 1 has just one value behind it, same as 2 and 3 but I want the All DEV one to have multiple values behind it such as 5,6,7,8 for clicking just the ALL DEV selection.
View 2 Replies
Sep 24, 2010
I am developing a Webpage that gives the user selection criterial before running a report. There is a asp.net ListBox that I need to get the selected values from. It is obviously a multi select listbox.
I need to pass the selected values as a comma separated string to a parameter used in an SQL query of the ObjectDataSource for the report. I was hoping some how to get the selected items, and load their value into a string array and then use the join( stringArray , "," ) to get the selected values into a string to send as a parameter to my objectdatasource but I cant seem to figure this out.. Ideally if code worked my way I would want to do something like this: Declare StringArray for each selected item in Mylistbox Add selected value to StringArray Set parameter = join( StringArray , "," ) Obviously this is what I need syntax for.. I pretty much just need to know how to get a string array or all selected values.
View 15 Replies
Dec 7, 2010
i have problem with adding list values(radio button list box ) to the database.my code seems to be correct.but when i clicked submit i got this error message. "Invalid column name 'Age'.all the filed names shown as invalid.how to solve this problem ?
[Code]....
and i also have another problem with a table.i'm able to insert and retrieve the data.but in sql interface all the coloums are empty.where all the data being stored.why i couldnt able to view the data?
View 3 Replies
Jun 25, 2010
In my DataTable I have 3 columns: ID, Title, Url. lstFKDoc is a ListBox, I want to use ListBox hoot the 3 columns without access database twice.
[Code]....
View 1 Replies
Dec 14, 2010
The values in the textbox inside my listbox disappear on scrolling vertically. Even if I use
ScrollViewer.VerticalScrollBarVisibility="Disabled"
it does not solve the problem...............
View 2 Replies
Jul 26, 2010
I try to set selected values in html.listbox.
I retun in my model multiSelectList:
model.SelectedDepartments = dto.Departments;
model.DepartmentsItems = new MultiSelectList(
_DepartmentRepository.GetAll(),
"Id", "IdentityNumber",
new int[] { 2 });
return model;
In html page i have these tags:
<label for="dto_Departments"><%= Html.GlobalResource("DiagnosticGroup", "DiagnosticGroup.Departments")%></label>
<%= Html.ListBox("dto.Departments", Model.DepartmentsItems, new { id = "dto_Departments" })%>
When I'm debugging program MultiSelectList contains selected second item in list.
View 1 Replies
Jan 19, 2011
I want to display panels based on the check boxes selected on the dynamic checkbox list control. I have been able to dynamically build the check box but have no idea on how to access its checked propety. This is what I am doing but getting error on Request.Form On page load wrote this code.
protected void Page_Load(object sender, EventArgs e)
{
int i;
int chkboxCount = Request.Form("chklist1").Count;
for ( i = 1; i < chkboxCount)
{
String valueChkbox = Request.Form["chklist1"];
}
}
View 2 Replies
Jul 16, 2010
I have a Listbox getting populated when the page loads itself and also in postbacks. Some items are already selected in that listbox even when the page loads or postbacks. I have to select one or more items in that textbox in addition to the selected one.
Till this point, it works perfectly, but the problem is that when i click an "update" button to save the newly added items, then also the page postbacks and so the list box get populated again. This will loose the newly selected items and none of the newly selected items will be saved.
So what should i do in order not to loose the newly selected items when i click the "update" button.
Note:- I need to populate the listbox on postbacks also. So the population of that listbox on postbacks cannot be discarded.
View 2 Replies
Jan 18, 2010
I am having 2 list box in my form. I am adding some values from 1st list box to 2nd one. What i need is i would like to save the data in the list box in sql table.
View 6 Replies
Feb 8, 2010
i have a list box (listbox1) populated with some values.i also have a table with some values.I'd like to show values from table which are NOT IN listbox1.here's a code. I see what the problem is. Just can't understand what is the solution.If I have one value in listbox it works fine, but if more than 1 it messed up, since it tries loop several times.
[Code]....it works fine. The only thing: If I want to update some properties of item, but do not update name(just leave name the way it was) it still fires the validation, and my update cannot pass validation since this name is already exists.i have a listbox populated with values from linqdatasource (or from datacontext using code-behind) Also I have formview which allows to insert new values to database.When I insert new value in the database, this value doesn't show up in listbox until I recompile project/restart browser. When i refresh page nothing happen. Only old values are visible. Id like to have more dynamic page. I tried updatepanels. Maybe I need somehow refresh database connection first?
View 2 Replies
