I am having a strange day! I am trying to access values inside the Datagrid control. There are textboxes in each row of the Datagrid control. If I use a asp.net button control outside the datagrid control I can access all the values. But if I use LinkButton outside the datagrid control then I cannot access any value.
I have to use LinkButton.
UPDATE 1: Code
//This works
Protected Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim indexes() As Integer = dgReceipts.SelectedIndexNumbers
End Sub
//This does not work and I get 0 items in the SelectedIndexNumbers
Protected Sub LinkButtonUpdateReceipts_Click(sender As Object, e As EventArgs) Handles LinkButtonUpdateReceipts.Click
Dim indexes() As Integer = dgReceipts.SelectedIndexNumbers
End Sub
<asp:Button ID="Button1" runat="server" Text="Button" />
<c1:LinkButton ID="LinkButtonUpdateReceipts" runat="server" Text="Update Totals" Icon="images/go-blue-right.gif"></c1:LinkButton>
I'm suprised that either of those work. You do not appear to have an OnClick event for either of those buttons. At a minimum I would add an OnClick event to your LinkButton that fires LinkButtonUpdateReceipts_Click.
Also, why aren't you just using <asp:LinkButton? what is <c1:LinkButton?
Related
I have a method "Grid Batch Update", in this case, i want get an id from button clicked in this method
Private Sub grid_BatchUpdate(ByVal sender As Object, ByVal e As DevExpress.Web.Data.ASPxDataBatchUpdateEventArgs) Handles grid.BatchUpdate
'My Code
End Sub
I have tried to search but not found the answer
Ok, then as a general rule, you can use "sender".
Protected Sub Button1_Click1(sender As Object, e As EventArgs) Handles Button1.Click
Dim btn As Button = sender
Debug.Print("id of button is " & btn.ID)
End Sub
However, do note if you going to have say several buttions use the SAME event?
Then you should remove the handles from above. And then you "must" then set the on-click event.
So, above becomes:
Protected Sub Button1_Click1(sender As Object, e As EventArgs)
Dim btn As Button = sender
Debug.Print("id of button is " & btn.ID)
End Sub
And I might then say have two buttons use the same click event. eg this:
<asp:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click1" />
<br />
<asp:Button ID="Button2" runat="server" Text="Button" OnClick="Button1_Click1" />
So, if you double click on a button from the web forms designer, it will NOT put in a OnClick tag, but uses the "handles button one in code behind.
Either way is fine - but you don't need (nor want) the "handles" tied to one button on the code behind - so use markup OnClick="Button1_Click1"
In above, then clicking on either button would result in this:
I have a very simple Textbox and Button, but Button click event not firing at first time ( only firing in second click)
<asp:TextBox ID="TxtSurvey" runat="server"></asp:TextBox> <br />
<asp:Button ID="BtnGoSurvey" runat="server" Text="LetsGo"/>
The code is very simple too
Protected Sub BtnGoSurvey_Click(sender As Object, e As EventArgs) Handles BtnGoSurvey.Click
Session("IDSurvey") = TxtSurvey.Text
BtnGoSurvey.PostBackUrl = "~/Survey.aspx"
End Sub
What i'm doing wrong ?
Thanks for help
If you can use Response.Redirect, then following is supposed to work:
Protected Sub BtnGoSurvey_Click(sender As Object, e As EventArgs) Handles BtnGoSurvey.Click
Session("IDSurvey") = TxtSurvey.Text
Response.Redirect("~/Survey.aspx",True)
End Sub
I'm relatively new to using VB, and am trying to do the following:
Select DropDownList item upon Button click
Link DropDownList items to internal pages
I feel like this is basic stuff, but am having a hard time with it.
Is this correct?
1 .
<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True">
<asp:ListItem Value="Answer.aspx">Answer</asp:ListItem>
2 .
<asp:Button ID="Button1" runat="server" Text="Button" onselectedindexchanged="DropDownList1_SelectedIndexChanged" />`
You will need to change your code a little bit to achieve this. First, you do not need the AutoPostback on the dropdown list unless you want it to hit the server when you select a new list item.
On the button click, you will want to remove the
OnSelectedIndexChange="DropDownList1_SelectedIndexChanged"
And replace it instead with the button's OnClick event.
OnClick = "Button1_Click"
You will need to add your vb code to redirect to the new page. I'm more of a C# guy, but this should work.
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs)
Dim LinkText as string
LinkText = DropdownList1.SelectedItem.Value
Response.Redirect(LinkText)
End Sub
Are you trying to say, after clicking the button, it will go to the other page by selecting in dropdownlist what page it is? If I'm correct, here's how it is.
Private Sub DropDownList1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles DropDownList1.SelectedIndexChanged
Response.Redirect(DropDownList1.SelectedValue.ToString)
End Sub
I have a .aspx page that contains a hidden panel that I need to display from a .ascx control.
On my .Click event from my button on my .ascx I have the following:
Dim myControl2 As Control = FindControl("Content1")
Dim myControl3 As Control = FindControl("keywordSearchModal")
On my .aspx I have the following:
<asp:Content ID="Content1" ContentPlaceHolderID="ContentHolder" runat="server">
<asp:Panel ID="keywordSearchModal" runat="server" Width="800px" Visible="true">
This is your modal
<asp:Button ID="OKButton" runat="server" Text="Close" />
</asp:Panel>
</asp:Content>
Both myControl2 and myControl3 contain nothing when the button is clicked.
How can I find this control from the .ascx that also happens to be an updatepanel.
UPDATE
I was able to find the control by doing the following:
Dim myPanel As Panel = Page.Master.FindControl("ContentHolder").FindControl("keywordSearchModal")
myPanel.Visible = False
Dim myControl As Control = Page.Master.FindControl("ContentHolder").FindControl("keywordSearchModal")
myControl.Visible = False
I was able to use the ContentPlaceHolderID - However now I can't change the visibility...
UPDATE II
thanks to the suggestion below I was able to capture the button click on my .aspx page. However, now just like before I can't seem to manipulate the control. In this example adding text to the panel.
Protected Sub SearchStart(ByVal sender As Object, ByVal e As EventArgs) Handles EquipmentDetails1.SearchStart
Dim newLabel As New Label
newLabel.Text = "This is a label!"
keywordSearchModal.Controls.Add(newLabel)
End Sub
Thoughts?
Here is what I've used in the past...
My user control has an imagebutton and the following in the codebehind
Public Event SearchStart As EventHandler
'This will be the event triggered when the imagebutton is clicked
Protected Sub ib_Search_Click(ByVal sender As Object, ByVal e As EventArgs) Handles ib_Search.Click
'Bubble up event to parent
RaiseEvent SearchStart(Me, e)
End Sub
Any page that uses the User Control will have the following in codebehind...
Protected Sub mc_SearchFilter_SearchStart(ByVal sender As Object, ByVal e As EventArgs) Handles mc_SearchFilter.SearchStart
'CODE that needs to be executed when search image button is clicked in my_control_SearchFilter
End Sub
Hope that helps....
I am experiencing a problem with buttons and AddHandler. It only works if I use AddHandler Button1.click, AddressOf... in Page_load, but if I create the button dynamically in one of the sub routines, the event doesn't fire.
For example,
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True">
<asp:ListItem>1</asp:ListItem>
<asp:ListItem>2</asp:ListItem>
</asp:DropDownList>
<asp:ScriptManager id="ScriptManager1" runat="server"></asp:ScriptManager>
<asp:UpdatePanel id="UpdatePanel1" runat="server" UpdateMode="Conditional" ChildrenAsTriggers="False">
<contenttemplate>
<asp:PlaceHolder id="PlaceHolder1" runat="server"></asp:PlaceHolder>
</contenttemplate>
</asp:UpdatePanel>
<asp:UpdatePanel id="UpdatePanel2" runat="server" UpdateMode="Conditional">
<contenttemplate>
<asp:Label id="Label2" runat="server" Text="Label"></asp:Label>
</contenttemplate>
</asp:UpdatePanel>
Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
Label1.Text = Date.Now
ScriptManager1.RegisterAsyncPostBackControl(DropDownList1)
End Sub
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs)
Label2.Text = "Panel refreshed at " + Date.Now.ToString()
End Sub
Protected Sub DropDownList1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles DropDownList1.SelectedIndexChanged
Dim b As New Button
b.Text = "Click"
ScriptManager1.RegisterAsyncPostBackControl(b)
AddHandler b.Click, AddressOf Button1_Click
PlaceHolder1.Controls.Add(b)
UpdatePanel1.Update()
End Sub
The dropdownlist works, but the button doesn't. What am I doing wrong?
You have to regenerate your dynamically created controls on every postback (at last in Page_Load, better in Page_Init). You have to set the ID of the controls accordingly because ASP.Net needs it to identify which control caused a Postback and to handle the appropriate events.
You could save the number of created buttons in ViewState and use this to regenerate them on Page_Load. Increase the number when you add a new button. Use this number also to make the Button's ID unique(append it to the ID) to ensure that its the same on every postback.
For further informations, have a look the Page-Lifecycle and ViewState with dynamically added controls.
Edit: As Joel commented, if you only need one Button you can set it's ID statically, but you have to regenerate it on postback f.e. to handle its click-event.
Just to aid anyone who has this problem and isn't quite sure how to implement. Here's a quick example.
This example starts out by displaying a dropdownlist. When user selects something from the dropdown, another dropdownlist appears.
I typed this off the top of my head, so it MAY contain errors, but you get the idea =)
In the aspx file, add a placeholder:
And in your codebehind:
...
Protected Sub Page_Init(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Init
'Store control count in viewstate
If Not IsPostBack Then ViewState("ControlCounter") = 1
'Rebuild dynamic controls on every postback so when page's life cycle hits Page_Load,
'selected values in the viewstate (asp.net default behavior) can be loaded into the dropdowns
Build_Dynamic_Controls()
End Sub
Protected Sub Build_Dynamic_Controls()
'Clear placeholder
myPlaceholder.Controls.Clear()
'This is where the control counter stored in the viewstate comes into play
For i as Integer = 0 To CInt(ViewState("ControlCounter") -1
Dim ddlDynamic as New DropDownList With {
.ID = "ddlDynamicDropdown" & i,
.AutoPostBack = True
}
'This is the event that will be executed when the user changes a value on the form
'and the postback occurs
AddHandler ddlDynamic.SelectedIndexChanged, AddressOf ddlDynamic_SelectedIndexChanged
'Add control to the placeholder
myPlaceholder.Controls.Add(ddl)
'Put some values into the dropdown
ddlDynamic.Items.Add("Value1")
ddlDynamic.Items.Add("Value2")
ddlDynamic.Items.Add("Value3")
Next i
End Sub
Protected Sub ddlDynamic_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs)
'When a dropdown value is changed, a postback is triggered (autopostback=true)
'The event is captured here and we add another dropdown.
'First we up the control count:
ViewState("ControlCounter") = CInt(ViewState("ControlCounter")) + 1
'Now that the "total controls counter" is upped by one,
'Let's recreate the controls in the placeholder to include the new dropdown
Build_Dynamic_Controls()
End Sub
...