Note: There was not any question with this kind of problem here or anywhere...
Ok, so I made my listview, and it's delete and edit events are working properly, now I want to implement a possibility for user to mark an element as "default".
D, E and Def are buttons
Reference
----------------------------------------------------------------
- ref1 - somevalue - somevalue - somevalue - [D] - [E] - [Def]
----------------------------------------------------------------
so that would be a row from a table, I made delete and edit work by handling events from listview,
Private Sub lvMain_ItemDelete(ByVal sender As Object, ByVal e As ListViewDeleteEventArgs) Handles lvMain.ItemDeleting
Dim refFac As new ReferenceFactory
refFac.Delete(e.Keys(0))
EndSub
similar for Editing. But now when I try to get values from Default button, the button wont even do anything...
This is the code:
<asp:ImageButton ID="ibtDefault" runat="server" ImageUrl="~/Images/Default16.png" CommandName="Default" />
and for my logic:
Public Sub ibtDefault_Click(ByVal sender As Object, ByVal e As ImageClickEventArgs )
SelectedRef.Name = "Test"
End Sub
I just wanted to test it whether it will run or not by changing the value of my global string that will show which Reference is made default. But it wont even do that...
Then I tried with Commands.
Private Sub lvMain_ItemCommand(ByVal sender As Object, ByVal e As ListViewCommandEventArgs) Handles lvMain.ItemCommand
If e.CommandName = "Default" Then
'Dim refID As New Integer
'Dim refer As ListViewItem
'refer = e.Item
SelectedRef.Name = "Test"
End If
End Sub
But this wont run either... What am I doing wrong here :S
Basically what I want to is that on click i save Reference Name and ID in two global variables i prepared.
Thanks
Default is a reserved word and may be messing with your code. When you run through your ItemCommand event, you can rebind the data at the end of it and it should refresh your page.
Related
Wasn't able to find anything about this situation:
I have two RadDatePicker inside RadGrid for start and end date change
<telerik:RadDatePicker ID="rdpStartDate" Skin="Library" EnableEmbeddedSkins="false" CommandName="StartDateChange" runat="server" />
By itself, they work fine, but now I have a situation when I need to call method when their value has been changed (CommandName was added for this)
I know how to do this outside RadGrid, basically:
Protected Sub rdpStartDateChanged(ByVal sender As Object, ByVal e As Telerik.Web.UI.Calendar.SelectedDateChangedEventArgs) Handles rdpStartDate.SelectedDateChanged
...
...
End Sub
But I wasn't able to do this inside RadGrid, because nothings seems to trigger it.
I tried to catch my command with this (works for buttons at least):
Protected Sub rgLibraryItemCommand(ByVal sender As Object, ByVal e As GridCommandEventArgs) Handles rgLibrary.ItemCommand
But, no, it doesn't see CommandName="StartDateChange"
What I need to do to be able to catch those Date change events if RadDatePicker
is placed inside RadGrid?
You need to identify the control inside the grid which triggers the action. I'm not sure which is the way for Rad to do that but it should be similar this:
Private Sub DataGridView1_ButtonClick(sender As DataGridView, e As DataGridViewCellEventArgs) _
Handles DataGridView1.CellButtonClick
'TODO - Button Clicked - Execute Code Here
End Sub
So you need to find the events for the DataGridViewRow for Rad and substitute them with the ones cell clicking events. This example should get you started.
Subscribing to an event on a control inside a RadGrid does not work the same way, because there could be multiple copies of the control or even none at all, depending on how many records are in the Data Source. Therefore, in order to subscribe to events on these controls, you have to do it manually after the data is bound, either in the ItemCreated event or ItemDataBound event.
Protected Sub rgLibraryItemCreated(ByVal sender as Object, ByVal e As GridItemEventArgs) Handles rgLibrary.ItemCreated
If TypeOf e.Item Is GridDataItem Then
Dim item As GridDataItem = e.Item
Dim rdpStartDate As RadDatePicker = item.FindControl("rdpStartDate")
AddHandler rdpStartDate.SelectedDateChanged, AddressOf rdpStartDateChanged
End If
End Sub
This is one of those problems which seems like it should have a simple solution but I can't work out what it is!
How can I pass a control from one sub to another if the first sub doesn't actually call the second? For example, where btnChangeText is in a panel that has a ModalPopupExtender called mpExample, and therefore isn't usually visible:
Protected Sub btnChangeText_Click(sender as object, e as EventArgs) Handles btnChangeText.Click
<SpecifiedTextBox>.Text = "Hello"
End Sub
And then on the main page, visible at all times, is a button associated with each textbox. In this example, it's textbox15:
Protected Sub btnChangeTextBox15_Click(sender as object, e as EventArgs) Handles btnChangeTextBox15.Click
<Set TextBox15 as variable>
mpExample.Show()
End Sub
I know it's a silly example - believe me when I say that the real application I want to make of this actually makes sense! But the point is that I want to somehow store the name of the control to be updated by the first sub when the second sub is run.
If I was calling the first sub from the second it'd be easy, I'd just pass it as an argument, but I'm not. The first sub is called from a button click and is an independent action from the running of the second sub.
I don't seem to be able to use a session variable (my first thought) because I can't find any way to store the control name as a string and then convert it back to an actual control when the first sub runs. That'd be the easiest answer if somebody could tell me how to do it.
One approach would be to store the control's ID as a string in a Session variable, and then use the FindControl method to grab the control in your 2nd Click event.
Protected Sub btnChangeTextBox15_Click(sender as object, e as EventArgs) Handles btnChangeTextBox15.Click
Session("currentTextBox") = TextBox15.ID
mpExample.Show()
End Sub
Protected Sub btnChangeText_Click(sender as object, e as EventArgs) Handles btnChangeText.Click
Dim currentTextBox As TextBox
currentTextBox = CType(Page.FindControl(Session("currentTextBox")),TextBox)
currentTextBox.Text = "Hello"
End Sub
Note that if your TextBox15 control is inside some kind of container (a Panel or something), you'll need to use that container's FindControl method, rather than Page.FindControl.
Another approach is to store the TextBox itself in a Session variable, and then pull that out to set the text in your other method. Note that this only works if the methods are both called in the same request (which doesn't sound like it would work for your use-case). Here's what that would look like:
Protected Sub btnChangeTextBox15_Click(sender as object, e as EventArgs) Handles btnChangeTextBox15.Click
Session("currentTextBox") = TextBox15
mpExample.Show()
End Sub
Protected Sub btnChangeText_Click(sender as object, e as EventArgs) Handles btnChangeText.Click
Dim currentTextBox As TextBox
currentTextBox = CType(Session("currentTextBox"), TextBox)
currentTextBox.Text = "Hello"
End Sub
I am trying to put a - what seems - very simple web user control
basically i want it to render as a dropdownlist/checkboxlist or radiolist based on a property
but also want to be able to work out what is selected
i was trying the following - but cant seem to work out how to attach to the selectedindexchanged of the listcontrol so that i can set the selectd value(s)
its not helping that my VB is not up to much but am forced to use it in this instance
its not even giving me the intellisense for the event..
Public Options As List(Of Options)
Public ControlRenderType As ControlRenderType
Public IncludeFreeOption As Boolean
Public SelectedOptions As List(Of Options)
Protected Sub Page_Init(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Init
Dim c As ListControl
Select Case (ControlRenderType)
Case STGLib.ControlRenderType.CheckBoxList
c = New CheckBoxList()
Case STGLib.ControlRenderType.DropdownList
c = New DropDownList()
Case STGLib.ControlRenderType.RadioButtonList
c = New RadioButtonList()
Case Else
Throw New Exception("No Render Type Specified")
End Select
For Each opt In Options
Dim li = New ListItem(opt.Description, opt.ID)
c.Items.Add(li)
Next
c.SelectedIndexChanged += ..?? or something
Page.Controls.Add(c)
End Sub
can anyone explain please - it is of course quite possible that I am going about this in completely the wrong way..
thanks
First create a Sub or a Function to handle the IndexChange of the object that you have created dynamically and make sure that the signature of the Sub is something like this
Sub myOwnSub(ByVal sender As Object, ByVal e As EventArgs)
...
... Handle your event here
...
End Sub
Then after you create your object add the following code
Dim obj as ListBox
AddHandler obj.SelectedIndexChanged, AddressOf myOwnSub
I have a checkbox and a panel inside of a FormView control, and I need to access them from the code behind in order to use the checkbox to determine whether or not the panel is visible. This is the code that I originally used, but since I put the controls inside of the FormView, it no longer works.
Protected Sub checkGenEd_CheckedChanged(ByVal sender As Object, _
ByVal e As System.EventArgs)
If checkGenEd.Checked = True Then
panelOutcome.Visible = True
Else
panelOutcome.Visible = False
End If
End Sub
I've started to figure this out based on other questions I looked up on here, but all of them were in C# instead of VB, so this is as far as I got:
Protected Sub FormView1_DataBound(ByVal sender As Object, ByVal e As System.EventArgs) Handles FormView1.DataBound
If FormView1.CurrentMode = FormViewMode.Edit Then
End If
End Sub
So yeah I'm not sure exactly how to finish it. I'm sorry, this might be pretty basic, but I'm new at this and any help would be appreciated!
EDIT: here's my code now:
Protected Sub FormView1_DataBound(ByVal sender As Object, ByVal e As System.EventArgs) Handles FormView1.DataBound
If FormView1.CurrentMode = FormViewMode.Edit Then
CheckBox checkGenEd = formview1.FindControl("checkGenEd");
Panel panelOutcome = formview1.FindControl("panelOutcome");
End If
End Sub
It's also saying that checkGenEd and panelOutcome are not declared.
EDIT: I changed my code to this but it still doesn't work:
Protected Sub FormView1_DataBound(ByVal sender As Object, ByVal e As System.EventArgs) Handles FormView1.DataBound
If FormView1.CurrentMode = FormViewMode.Edit Then
Dim checkGenEd As CheckBox = FormView1.FindControl("checkGenEd")
Dim panelOutcome As Panel = FormView1.FindControl("panelOutcome")
If checkGenEd.Checked = True Then
panelOutcome.Visible = True
Else
panelOutcome.Visible = False
End If
End If
End Sub
There aren't any errors anymore, but nothing happens when I click the checkbox. I think there needs to be some kind of event to trigger it but I don't know how you can put an event handler inside of an event handler.
With FormView, you have to use find control, as in:
CheckBox checkGenEd = (CheckBox)formview1.FindControl("checkGenEd");
Panel panelOutcome = (Panel)formview1.FindControl("panelOutcome");
You cannot reference a control directly by ID.
HTH.
In VB you need use Directcast
Dim chk As Checkbox = DirectCast(Me.FormView1.FindControl("checkgen"), Checkbox)
FormView has its own event framework. A normal control within a FormView won't generate the postback events you are looking for. I initially made the same mistake. I wanted, like you, to generate some kind of postback that could be intercepted at the server end. Once we get back to the server we can look at the values in checkboxes etc depending on whatever business rules apply. This is what I did.
First of all put all relevant controls within an
<EditItemTemplate>
section within the FormView. (There are other Template tags that may be more appropriate). To generate the postback have a button (for example) like the one below. (This has to be within the EditItemTemplate section as well):
<asp:linkbutton id="UpdateButton"
text="Update"
commandname="Update"
runat="server"/>
You can intercept this at the server with the FormView event ItemCommand. For example:
Private Sub FormView1_ItemCommand(sender As Object, e As System.Web.UI.WebControls.FormViewCommandEventArgs) Handles FormView1.ItemCommand
'your code here
End Sub
Once you are back at the server you can then start looking at the various controls to see what they hold, using findControl if necessary. The button command shown above is an example so you might want to use another control.
I have a button in a grid that I created programmatically. The button edits some data in a table using data in a hidden column of the grid that the button is in. Normally I send a hidden field the row data using javascript onclientclick of the button then make the changes to the database using that hidden field. But there must be a way to send the addhandler of the button a parameter. This is the code i have to clarify....
Dim btnedit As New ImageButton
AddHandler btnedit.Click, AddressOf btnedit_Click
btnedit.ImageUrl = "\images\bttnEditMini.gif"
If e.Row.RowType <> DataControlRowType.Header And e.Row.RowType <> DataControlRowType.Footer Then
e.Row.Cells(3).Controls.Add(btnedit)
End If
here is my Addhandler with its delegate:
Public Delegate Sub ImageClickEventHandler(ByVal sender As Object, ByVal e As ImageClickEventArgs)
Sub btnedit_Click(ByVal sender As Object, ByVal e As ImageClickEventArgs)
//programming stuff
End Sub
How can i send this handler a parameter?
By convention, all event handlers accept two parameters: the sender, and the EventArgs. If you need to send custom information to the listeners, create a new class that inherits from EventArgs and contains the information that you need to communicate.
Check out this article on CodeProject that shows you how to do this.
Short answer: no. Where would you send it? You've got two parameters.
Longer answer: sender is the control that sent the event. In this case, it will be your btnEdit control. Maybe that will help you.
Since it was in a grid i just used the row command instead. And when Row command is used you can send it a commandname and a commandargument. I passed my parameter as the argument.
GridView1.Rows(i).Cells(3).Controls.Add(btndel)
btndel.ImageUrl = "\images\bttnDelete.gif"
btndel.ToolTip = "This will delete the Selected Assignment"
btndel.CommandName = "destroy"
btndel.CommandArgument = GridView1.Rows(i).Cells(0).Text
btndel.Attributes.Add("onclick", "javascript: if(confirm('Are you sure you want to delete this Department Cost Days Assignment?')==false) return false;")
here is the rowcommand:
Protected Sub GridView1_RowCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles GridView1.RowCommand
If e.CommandName = "destroy" Then 'used destroy because Delete command was prohibited.
Call Connection()
Dbcmd.CommandText = "Delete from table where condition = '" & e.CommandArgument & "'"
Dbcmd.ExecuteNonQuery()
Dbconn.Close()
Dbconn.Dispose()
End If
If you don't want to use the 'default'/already defined parameters, you can create your own events.