There's got to be an easier way to do what I came up with here:
int lastDayInList = ddlBirthDay.Items.IndexOf(ddlBirthDay.Items[ddlBirthDay.Items.Count -1]);
This will give you the last item in a drop down list.
ListItem lastItem = ddlBirthDay.Items[ddlBirthDay.Items.Count-1]
In your code, it looks like you are getting the index of the last item. However, the accessible index of the last item will be -1 of the count.
If you are using .net v3.5 then Linq is an option, too.
ListItem latItem = ddlBirthday.Items.Last();
ListItem latItem = ddlBirthday.Items.LastOrDefault();
Related
I have multiple controls on a page that are all similar and are all numbered. For instance, I have multiple month controls like this:
Replacement1MonthDropDownList
Replacement2MonthDropDownList
Replacement3MonthDropDownList
Etc.
But when I have common code that works on all of the controls, I need a big Select Case statement like this:
Select Case Count
Case 1
Call Me.FillReplacements(rf.Replacements(0), Me.Replacement1MonthDropDownList, Me.Replacement1AmountTextBox, Me.ReplacementSaveButton)
Case 2
Call Me.FillReplacements(rf.Replacements(0), Me.Replacement1MonthDropDownList, Me.Replacement1AmountTextBox, Me.ReplacementSaveButton)
Call Me.FillReplacements(rf.Replacements(1), Me.Replacement2MonthDropDownList, Me.Replacement2AmountTextBox, Me.SplitButton1)
Is it possible to loop through the controls and get them by name--justreplacing the numbers in the name with the current Count in my loop?
Sorry, I'm very new to Visual Basic! :S
Yes, you can. The Page class (Me, in this case) has a FindControl method which allows you to find a control by name. So, for instance, you could do something like this:
Dim monthControl As Control = Me.FindControl("Replacement" & Count.ToString() & "MonthDropDownList")
Dim splitControl As Control = Me.FindControl("SplitButton" & Count.ToString())
If you need to cast them as a more specific type, you could use DirectCast. For instance:
Dim monthControl As DropDownList = DirectCast(Me.FindControl("Replacement" & Count.ToString() & "MonthDropDownList"), DropDownList)
Alternatively, and perhaps preferably, you could make an array of controls so you could access them by index. For instance, if you had an array like this defined:
Private monthControls() As DropDownList = {Replacement1MonthDropDownList, Replacement2MonthDropDownList, Replacement3MonthDropDownList}
Then you could access it by index like this:
Dim currentMonthControl As DropDownList = monthControls(Count)
I have a dropdownlist populating list of values in it in page_load .
I want to select a specific value
Me.DropDownList_LocalOfficeAssignment.SelectedValue = ct.LocalOfficeName
Me.DropDownList_LocalOfficeAssignment has list of values.
Problem is: It always pointing to first item.
i tried this
For Each item As ListItem In Me.DropDownList_LocalOfficeAssignment.Items
If item.Equals(ct.LocalOfficeName) Then
item.Selected = True
Exit For
End If
Next
DV.Dispose()
still pointing to the first item. i debugged, it should point to the last item.
ct.localoffice is containing the last item in the list. This is how i am populating the dropdown :
Dim DV As DataView = New DataView(CacheVariable.States.Tables(0))
Dim DRV As DataRowView
Me.DropDownList_LocalOfficeAssignment.Items.Clear()
DV = New DataView(CacheVariable.LocalOffice.Tables(0))
If DV.Count > 0 Then
For Each DRV In DV
Me.DropDownList_LocalOfficeAssignment.Items.Add(New ListItem(DRV("Name"), DRV("LocalOfficeID").ToString))
Next
End If
Based on lengthy comments on the question...
You're looking for the wrong value when you try to set the SelectedValue. Take a look at how you create your ListItems:
Me.DropDownList_LocalOfficeAssignment.Items.Add(New ListItem(DRV("Name"), DRV("LocalOfficeID").ToString))
When creating a ListItem, you pass it both its display text and its underlying value. In this case, you're setting them as:
Display Text = DRV("Name")
Underlying Value = DRV("LocalOfficeID")
According to your comments, the sample data looks something like this:
LocalOfficeID | Name
--------------------
1 | abc
2 | def
3 | xyz
Then, when you try to manually set the SelectedValue, you're passing it the wrong value. You're essentially trying to do this:
DropDownList_LocalOfficeAssignment.SelectedValue = "xyz"
None of the Value properties on the ListItems are "xyz". They're "1", "2", and "3". In order to set the SelectedValue, you need this:
DropDownList_LocalOfficeAssignment.SelectedValue = "3"
So this line needs to change:
Me.DropDownList_LocalOfficeAssignment.SelectedValue = ct.LocalOfficeName
On your ct object you need to get the identifier for the object, not its display name. Probably something like this (though without knowing what ct is I can't be certain):
DropDownList_LocalOfficeAssignment.SelectedValue = ct.ID
If you don't have the identifier, then you can find it on the DropDownList by searching for the display name. Something like this should work, though there may be a more elegant way to do it:
DropDownList_LocalOfficeAssignment.SelectedIndex = DropDownList_LocalOfficeAssignment.Items.IndexOf(DropDownList_LocalOfficeAssignment.Items.FindByText(ct.LocalOfficeName))
Using the identifier would be much cleaner, though.
This is usually because the DropDownList does DataBind() after you set the SelectedValue. Do you have the DropDownList.DataSourceID property set? Are you calling DataBind() later in the page lifecycle?
I have a quick question about JQuery. I have dynamically generated paragraphs with id's that are incremented. I would like to take information from that page and bring it to my main page. Unfortunately I am unable to read the dynamically generated paragraph IDs to get the values. I am trying this:
var Name = ((data).find("#Name" + id).text());
The ASP.NET code goes like this:
Dim intI As Integer = 0
For Each Item As cItem in alProducts1
Dim pName As New System.Web.UI.HtmlControls.HtmlGenericControl("p")
pName.id = "Name" & intI.toString() pName.InnerText = Item.Name controls.Add(pName) intI += 1
Next
Those name values are the values I want...Name1, name2, name3 and I want to get them individually to put in their own textbox... I'm taking the values from the ASP.NET webpage and putting them into an AJAX page.
Your question is not clear about your exact requirement but you can get the IDs of elements with attr method of jQuery, here is an example:
alert($('selector').attr('id'));
You want to select all the elements with the incrementing ids, right?
// this will select all the elements
// which id starts with 'Name'
(data).find("[id^=Name]")
Thanks for the help everyone. I found the solution today however:
var Name = ($(data).find('#Name' + id.toString()).text());
I forgot the .toString() part and that seems to have made the difference.
I encounter this problem repeatedly, and haven't a clue what is causing it. I get an exception in the DataBind: SelectedValue which is invalid because it does not exist in the list of items.
Here are some important pieces of information:
I reload listOrgs periodically when the underlying data has changed.
The Organization.DTListAll call returns 2 Int, String pairs.
There are no duplicate or null values in the returned data
After the first two lines below, listOrgs.Items.Count is 0, and the Selected Value is 0
The selected value after the DataBind operation executes is the ID value from the first row in the data
This exception happens the very first time this code is executed after a fresh page load
listOrgs.Items.Clear();
listOrgs.SelectedValue = "0";
listOrgs.DataSource = new Organization().DTListAll(SiteID);
listOrgs.DataTextField = "OrganizationName";
listOrgs.DataValueField = "OrganizationID";
listOrgs.DataBind();
Apparently the solution I posted wasn't entirely effective... Eventually in my application I changed to this:
listOrgs.Items.Clear();
listOrgs.SelectedIndex = -1;
listOrgs.SelectedValue = null;
listOrgs.ClearSelection(); // Clears the selection to avoid the exception (only one of these should be enough but in my application I needed all..)
listOrgs.DataSource = new Organization().DTListAll(SiteID);
listOrgs.DataTextField = "OrganizationName";
listOrgs.DataValueField = "OrganizationID";
listOrgs.DataBind();
I kept getting this error.
Weird thing is that before I set the datasource and rebind after deleting an item the selected index = -1.
If I explicitly set the selectedIndex = -1; then it works and doesn't throw an error.
So even though it was already -1 setting it to -1 stops it from erroring.
Weird eh?
Try setting listOrgs.SelectedValue = "0" after you refresh the DataSource
At the moment you are trying to select the first item in an empty list.
Change the first two line with this :
listOrgs.SelectedItem.Selected = false;
listOrgs.Items.Clear();
In case you still have this problem this is how i resolved it:
listOrgs.SelectedIndex = -1; // Clears the SelectedIndex to avoid the exception
listOrgs.DataSource = new Organization().DTListAll(SiteID);
listOrgs.DataTextField = "OrganizationName";
listOrgs.DataValueField = "OrganizationID";
listOrgs.DataBind(); //Unless you have "listOrgs.AppendDataBoundItems = true" you don't need to clear the list
#PMarques answer helped me out and did solve my problem.
However whilst experimenting, it clicked in my head why I was gettign the error in the first place.
I was setting the "Text" attribute thinking that it might create an encompassing label or fieldset + legend, for me (which it doesn't).
The Text property for a list is infact the SelectedValue property for a ListControl.
So my mistake in misinterpreting what the text property did.
Not sure it is your case, but I had the same problem and apparently there was no explanation, then I realized doing a copy and paste on notepad of a field of database that at the beginning of the value there was a NULL.
Curious thing was that a select joining tables was working. I deleted the row and reinserted, after was working fine.
I was getting the same error repeatedly and try ending up by not setting the default selected value to Index -1.
I commented my code ddlDRIBidAmt.SelectedValue = -1
This value was set at the time where my Page Controls were reset to default values.
I know its too late to answer, but what I tried is an dirty solution but it worked.
After databinding, I am insert a item at index 0
ddl.Items.Insert(0, new ListItem("---Select---","-1"));
And on setting,
I am placing try catch, In catch i am setting Value to -1
I have a strange problem. Let's look at that code:
TreeNode tn = TreeView1.FindNode("2009/08/12 (1)"); //OK, the Node is found
Now, I need to delete that node:
(IT DOESN'T WORK !)
(e.g. (I know that I don't need to use TreeView1.FindNode() method, but i = -1))
TreeNode tn1 = TreeView1.FindNode(tn.ValuePath);
int i = TreeView1.Nodes.IndexOf(tn1);
or
TreeView1.Nodes.Remove(tn);
The problem is, the codes above doesn't work, I mean, the node isn't removed, why ?
The TreeView looks like that:
alt text http://img130.imageshack.us/img130/230/71970321.png
It seems that the TreeView control in .net only allows to remove First Level Nodes, so if the node you are trying to delete is not this kind of node, you need to delete it trough its parent, using something like this:
Dim Padre As TreeNode = TreeView1.SelectedNode.Parent
If (Padre Is Nothing) Then
TreeView1.Nodes.Remove(TreeView1.SelectedNode)
Else
Padre.ChildNodes.Remove(TreeView1.SelectedNode)
End If
Hope it helps!
Are you sure that you've selected the node properly? If TreeView1.Nodes.IndexOf(tn1) is returning -1, this indicates the node can't be found.